CN114750282B - Radiation cracking-resistant large-volume heavy concrete and preparation method and construction method thereof - Google Patents
Radiation cracking-resistant large-volume heavy concrete and preparation method and construction method thereof Download PDFInfo
- Publication number
- CN114750282B CN114750282B CN202210289147.1A CN202210289147A CN114750282B CN 114750282 B CN114750282 B CN 114750282B CN 202210289147 A CN202210289147 A CN 202210289147A CN 114750282 B CN114750282 B CN 114750282B
- Authority
- CN
- China
- Prior art keywords
- concrete
- steps
- method comprises
- following
- pouring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000010276 construction Methods 0.000 title claims abstract description 55
- 238000005336 cracking Methods 0.000 title claims abstract description 47
- 230000005855 radiation Effects 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 153
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000004568 cement Substances 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 10
- 239000011707 mineral Substances 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 9
- 239000004576 sand Substances 0.000 claims description 64
- 238000005266 casting Methods 0.000 claims description 53
- 238000004519 manufacturing process Methods 0.000 claims description 51
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 48
- 229910052742 iron Inorganic materials 0.000 claims description 24
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 20
- 239000003638 chemical reducing agent Substances 0.000 claims description 18
- 239000010881 fly ash Substances 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 16
- 239000004575 stone Substances 0.000 claims description 15
- 239000010410 layer Substances 0.000 claims description 14
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical group [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 229920000742 Cotton Polymers 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 9
- 238000003780 insertion Methods 0.000 claims description 9
- 230000037431 insertion Effects 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 8
- 230000003020 moisturizing effect Effects 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 6
- 239000000395 magnesium oxide Substances 0.000 claims description 6
- 238000005728 strengthening Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 238000009529 body temperature measurement Methods 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- 230000008520 organization Effects 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 3
- 230000005856 abnormality Effects 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 229910021529 ammonia Inorganic materials 0.000 claims description 3
- 239000002956 ash Substances 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000006253 efflorescence Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- 230000003203 everyday effect Effects 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 239000008397 galvanized steel Substances 0.000 claims description 3
- 238000005286 illumination Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims description 3
- 238000007726 management method Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000013439 planning Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 claims description 3
- 238000012797 qualification Methods 0.000 claims description 3
- 206010037844 rash Diseases 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- 239000008399 tap water Substances 0.000 claims description 3
- 235000020679 tap water Nutrition 0.000 claims description 3
- 238000012384 transportation and delivery Methods 0.000 claims description 3
- 239000011800 void material Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- 150000004763 sulfides Chemical class 0.000 claims 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims 1
- 230000036571 hydration Effects 0.000 abstract description 9
- 238000006703 hydration reaction Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 4
- 230000002411 adverse Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 abstract description 2
- 238000009472 formulation Methods 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 abstract 1
- 230000002195 synergetic effect Effects 0.000 abstract 1
- 238000003723 Smelting Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B15/00—General arrangement or layout of plant ; Industrial outlines or plant installations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
- C04B22/066—Magnesia; Magnesium hydroxide
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention provides radiation cracking resistant high-volume heavy concrete and a preparation method and a construction method thereof, wherein the formulation and the proportion are as follows: the radiation-resistant cracking mass concrete is reasonable in design, the dosage of cement and cementing materials is reduced as much as possible through reasonable matching and optimization of the mineral admixture, hydration heat release quantity can be greatly reduced, the shrinkage and cracking risk of the concrete can be controlled, the water-cement ratio and the maximum water consumption of the concrete are reasonably controlled, adverse effects caused by self shrinkage are reduced, and a proper amount of efficient cracking agent is further doped on the basis to produce the self-shrinkage and temperature-reduction shrinkage of the expansion-compensated concrete, so that the cracking resistance is improved through the synergistic regulation and control of the hydration rate and shrinkage process, and the cracking of the concrete is inhibited.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to radiation cracking-resistant large-volume heavy concrete, a preparation method and a construction method thereof.
Background
To shield various rays, a high-density shielding material is required, the high-density shielding material can attenuate the energy of the rays to a great extent, and when the material reaches a certain thickness, the rays can be completely absorbed and cannot pass through. The high-density materials in nature comprise lead, concrete, steel, uranium ore, tungsten and common soil, and the concrete has the advantages of wide material sources, low cost, high density, strong overall plasticity, easiness in forming and capability of being applied in a large volume, and can be used as a main radiation-proof method, however, the radiation-proof cracking effect of the existing concrete can be further improved, so that the invention provides the radiation-proof cracking large-volume heavy concrete and the preparation method and the construction method thereof.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the radiation-resistant cracking large-volume heavy concrete and the preparation method and the construction method thereof, the radiation-resistant cracking large-volume heavy concrete is reasonable in design, the workability of the concrete can be improved, the hydration heat of the concrete can be reduced, the heat peak is delayed, the workability of the concrete can be improved by adding a proper amount of mineral powder, the pumping performance of the concrete can be improved, the cement consumption can be reduced, the hydration heat of the concrete can be improved, and the heat peak is delayed.
In order to achieve the above object, the present invention is realized by the following technical scheme: the formula and the proportion of the radiation cracking resistant large-volume heavy concrete are as follows: cement 280, fly ash 50, mineral powder 50, an expanding agent 30, magnetite sand 600, magnetite ore 1650, yellow sand 400, water 150, an anticracking agent 32.8 and a water reducing agent 10.
A preparation method of radiation cracking resistant large-volume heavy concrete comprises the following specific steps:
step one: equipment reconstruction and upgrading measures; the method comprises the following specific steps:
(1) the method comprises the following steps The production line mixer blade is entirely replaced with a brand new abrasion-resistant blade and is specially used for heavy concrete mixing production;
(2) the method comprises the following steps The aggregate blanking bin and the weighing hopper of the production line are reinforced, so that the feeding safety of the iron ore sand and the stone is ensured;
(3) the method comprises the following steps The magnetite sand and Dan Zhuancang are piled up to prevent pollution.
Step two: preparing measures before production; the method comprises the following specific steps:
(1) the method comprises the following steps The iron ore sand and the stone bin are cleaned a week before the production plan, and are manually washed by a high-pressure water gun, so that the iron ore sand and the stone bin are effectively isolated from other materials and prevented from being polluted;
(2) the method comprises the following steps Informing the iron ore sand and gravel of the goods intake, requiring the transport by using a skip wagon, covering tarpaulin for rain protection, and ensuring that the quantity of the goods intake is sufficient, meeting the construction requirement and leaving the allowance;
(3) the method comprises the following steps After the iron ore and sand arrives at the station, a constructor is informed to dispatch a person to supervise weighing, the laboratory rapidly measures sand and Dan Hanshui rate, the constructor and the force ore should be about the water content range of the iron ore and sand in advance, and a forklift and 3-5 workers are organized to assist in unloading.
(4) The method comprises the following steps The iron ore sand and stone is fed from factory, strict quality detection is needed, re-detection is carried out from aspects of appearance, water content, density and the like, a week of organization is advanced to enter the special sand and stone aggregate for common large-volume anti-cracking concrete successively, and sufficient preparation is advanced according to the planned amount;
(5) the method comprises the following steps Preparing a special anti-cracking agent and a special water reducer 5 days in advance, and reserving a powder bin and a water reducer tank on each production line;
(6) the method comprises the following steps The cement and the fly ash are prepared three days in advance, so that sufficient inventory is ensured, the powder is naturally cooled, and the excessive temperature of the just-entered powder is prevented.
Step three: concrete production; according to the proportion of various raw materials, a proper amount of raw materials are prepared, and a production line is used for preparing concrete.
Step four: ensuring measures for concrete production; the method comprises the following specific steps:
(1) the method comprises the following steps In the production process of the proton center concrete of the production line, other project concrete plans uniformly stop production;
(2) the method comprises the following steps The production line exclusively produces heavy concrete, each plate of the heavy concrete is produced according to the formula of 1.5, and the stirring time is prolonged to two minutes;
(3) the method comprises the following steps Loading heavy concrete 6-8 times in a single pass of all tank trucks, and strictly prohibiting flushing of a discharging hopper by a driver before discharging is finished, and strictly prohibiting water addition;
(4) the method comprises the following steps The pouring speed of the heavy concrete pump truck is determined according to the actual situation of the site;
(5) the method comprises the following steps Common mass concrete is produced in special lines of other production lines;
(6) the method comprises the following steps Other production matters are carried out according to the usual production requirements;
(7) the method comprises the following steps And (3) reinforcing raw material management: before the concrete is produced by opening a disc, a quality inspector checks the corresponding conditions of raw materials and the mixing ratio in the bin, so that consistency is ensured;
(8) the method comprises the following steps And (5) strengthening factory acceptance: according to the requirement of 'disc inspection and vehicle inspection and acceptance', a full-time quality inspector performs concrete disc opening detection to ensure that the delivery qualification rate of concrete is 100%;
(9) the method comprises the following steps And (3) strengthening field quality supervision: ensuring that a quality inspector monitors the on-site concrete quality on site to perform timely feedback coordination when the concrete is supplied.
A construction method of radiation cracking resistant large-volume heavy concrete comprises the following specific steps:
step one: transportation regulations; the method comprises the following steps:
(1) the method comprises the following steps Before the concrete mixing truck receives materials, the accumulated water in the tank should be discharged;
(2) the method comprises the following steps During transportation and waiting for discharging, the normal rotation speed of the tank body of the concrete mixer truck should be kept, and the tank body must not stop rotating;
(3) the method comprises the following steps Before discharging, the tank body of the concrete mixing transport vehicle is preferably rapidly rotated and stirred for more than 20 seconds and then discharged;
when the concrete mixing transport vehicle is used for transportation, traffic safety commander should be arranged at the entrance and exit of the vehicle at the construction site, the road at the construction site should be smooth, and a circulating lane should be arranged under condition; the dangerous area should be set with warning sign; when in construction at night, good illumination is required;
(4) the method comprises the following steps Water is strictly forbidden in the concrete transportation, conveying and pouring processes; concrete scattered in the concrete transportation, conveying and pouring processes is strictly forbidden to be used for pouring the structure;
(5) the method comprises the following steps The stirring tank of the concrete transportation stirring truck is required to be subjected to heat preservation or heat insulation measures, the transportation and waiting time is not suitable to be longer than 90min, and the slump loss is controlled within an allowable value so as to ensure the mold-in slump of the concrete and the continuity of pouring;
(6) the method comprises the following steps Before pouring, construction organizations are reasonably arranged according to pouring amount, and difference between the setting time of a pouring body and the setting time under indoor standard conditions is distinguished, so that construction continuity is ensured, and cold joints are avoided.
Step two: planning a line; the distance from the stirring station to the project site is calculated, a plurality of alternative transportation lines are scheduled to pay attention to through GPS information in time, so that the supply is ensured to be free from traffic during the concrete construction period, and meanwhile, in order to avoid the phenomenon of congestion in the early and late peak periods, a standby line is selected before construction, and the congestion in the peak periods is avoided.
Step three: pouring concrete; the bottom plate and the top plate concrete pouring adopts a method of oblique pushing and layered pouring, each layer of pouring thickness is about 500mm, construction is organized in a mode of oblique pushing from a far end to a pump direction, the side wall adopts sectional pouring, and one-time pouring is controlled within 3400mm so as to ensure the verticality and pouring quality of the side wall, and the concrete steps are as follows:
(1) the method comprises the following steps The proton machine room bottom plate is poured for the first time, the pouring elevation is-4.410 m to-3.010 m, the plate thickness is 1400mm, the pouring volume is 650m3, one pump truck is expected to be used for pouring, each trolley is expected to pour 40m3 per hour, and the pouring is completed in 16 hours;
(2) the method comprises the following steps Casting the side wall for the second time, wherein the casting elevation is-3.010 m to-0.300 m, the casting height is 2.710m, the wall thickness is 1000-3350mm, the casting volume is 621m3, casting is expected to be carried out by using one pump truck, casting is carried out for 40m < 3 > per hour by using each truck, and the casting is completed in 16 hours;
(3) the method comprises the following steps Thirdly, pouring the side wall, wherein the pouring elevation is-0.300 m to 3.100m, the pouring height is 3.400m, the wall thickness is 1000-3350mm, the pouring volume is 778m3, one pump truck is expected to be used for pouring, each trolley is used for pouring 40m3 per hour, and the time is 20 hours for pouring to finish;
(4) the method comprises the following steps Pouring the side wall for the fourth time, wherein the pouring elevation is 3.100m to 5.520m, the pouring height is 2.420m, the wall thickness is 1000-3350mm, the pouring volume is 552m < 3 >, the pouring is expected to be performed by a pump truck, each trolley is poured for 40m < 3 > per hour, and the pouring is completed in 14 hours;
(5) the method comprises the following steps The fifth casting of the proton machine room top plate has the casting elevation of 5.520m to 6.270m, the plate thickness of 750mm and the casting volume of 350m3, and is expected to be cast by a pump truck, 40m3 is cast per hour by each truck, and the casting is completed within 9 hours.
(6) The method comprises the following steps Pouring a proton machine room top plate for the sixth to eighth times, wherein common concrete backfilling is adopted, the backfilling height is 3100mm, and the total backfilling is divided into three times, wherein the backfilling heights are 1000mm,1000mm and 1100mm;
step four: processing construction joints; in order to ensure the concrete pouring quality and avoid the influence of construction joints on radiation, the construction joints of all side walls are processed in a convex shape, and the construction joints with the elevation lower than 0.500m are provided with galvanized steel sheet water stops, so that the proton local horizontal structures are poured and formed at one time, and the generation of vertical construction joints is avoided;
step five: vibrating the concrete; the vibrator is adopted to vibrate, the insertion distance is not larger than one time of the vibration action radius of the vibrating rod, the insertion depth is about 50mm from the casting thickness to the lower layer mixture, the distance between the lower layer mixture and the side mould is 50-100mm, the displacement distance of the vibrator is suitable for enabling the vibrator flat plate to cover the vibrated part by about 100mm, the vibration time is preferably controlled within 10s-30s according to different conditions such as the slump of the mixture and the vibration part, the quick insertion and the slow extraction are realized, and the leakage vibration and the over vibration are avoided;
step six: curing the concrete; the method comprises the following steps:
(1) the method comprises the following steps Curing the concrete on the surface of the wall body with a mold, covering heat-insulating cotton, and spraying and moisturizing, wherein the curing time is more than or equal to 28d;
(2) the method comprises the following steps Curing the roof concrete by adopting a film, covering heat-insulating cotton, and spraying for moisturizing, wherein the curing time is more than or equal to 28 days;
(3) the method comprises the following steps The bottom plate concrete is cured by adopting a film and covered with heat preservation cotton, and is sprayed for preserving moisture, and the curing time is more than or equal to 28 days.
Step seven: measuring the temperature of mass concrete; the method comprises the following steps:
(1) the method comprises the following steps Arranging surface layer, bottom layer and central temperature measuring points along the thickness direction of the concrete pouring body, wherein the distance between the measuring points is not more than 500mm;
(2) the method comprises the following steps The surface temperature of the concrete casting body is preferably 50mm below the surface of the concrete casting body;
(3) the method comprises the following steps The temperature of the bottom layer of the concrete casting body is preferably 50mm above the bottom surface of the concrete casting body.
Step eight: controlling the temperature of the mass concrete; the method comprises the following steps:
(1) the method comprises the following steps Timely report of abnormality found by measurement personnel
(2) The method comprises the following steps The quality inspector inspects the temperature measurement and heat preservation conditions of the site every day
(3) The method comprises the following steps The measurement specialist archives the collected records to the data specialist.
In the embodiment, the cement is in the model of Adam P.O42.5, the fly ash is in the model of II, the mineral powder is in the model of S95, the expanding agent is in the model of magnesia expanding agent, the magnetite sand is large-smelting magnetite sand, the magnetite ore is large-smelting magnetite ore, the yellow sand is medium sand, the water is tap water, the anticracking agent is in the model of Su Bote HME-V, and the water reducer is in the model of Su Bote PCA-I.
In this embodiment, the fly ash must not use high-calcium fly ash or finely ground fly ash, and desulfurization and denitration ash which releases strong ammonia smell in the production process is strictly forbidden.
In this embodiment, the content of the needle-shaped particles in the magnetite ore should not be greater than 20%, the content of chloride ions should not be greater than 0.02%, the content of sulfide and sulfate should not be greater than 0.5%, and other performance indexes should meet the requirements of JGJ 52.
In the embodiment, clean medium coarse sand with low water absorption and small void ratio is adopted as the yellow sand, the fineness modulus is preferably 2.4-2.8, the fineness modulus is not lower than 2.3 and higher than 3.0, and the grain composition meets the requirement of a zone II; the mud content in the sand is less than or equal to 3.0%, the mud block content is less than or equal to 1.0%, sea sand, mountain sand and porous sand with serious efflorescence cannot be used, the water reducer uses the polycarboxylic acid high-performance water reducer with low shrinkage ratio, and the 28d drying shrinkage ratio is less than or equal to 100%.
In the embodiment, the anti-cracking agent is an expansion material prepared by a suspension kiln and taking light burned MgO as a main component, has the characteristics of adjustable expansion starting time, expansion rate, expansion ending time, expansion amount and the like, and is suitable for mass concrete or concrete structures with higher internal temperature rise.
In the seventh step, when the temperature is measured, the temperature measuring points are arranged at the position which is easy to crack as much as possible, and the highest temperature rise, the temperature difference between the inner surface and the outer surface, the temperature reduction rate and the environmental temperature in the concrete casting body are reflected truly.
In the seventh embodiment, the measurement is performed 1-3d after pouring, 4-7d after pouring, and 7d-14d after pouring, and 12 h.
The invention has the beneficial effects that:
1. the radiation-cracking-resistant large-volume heavy concrete can improve the workability of the concrete, reduce the hydration heat of the concrete, delay a thermal peak, improve the workability of the concrete, and be beneficial to improving the pumping performance of the concrete, reducing the cement consumption, improving the hydration heat of the concrete and delay the thermal peak by adding a proper amount of mineral powder.
2. The radiation-resistant cracking high-volume heavy concrete is optimized by reasonably blending mineral admixture, so that the consumption of cement and cementing materials is reduced as much as possible, the hydration heat release amount is greatly reduced, the shrinkage and cracking risk of the concrete are favorably controlled, the water-cement ratio and the maximum water consumption of the concrete are reasonably controlled, the adverse effect caused by self shrinkage is reduced, a proper amount of efficient cracking resistance agent is further added on the basis, on one hand, the heat release process is optimized, the hydration heat release temperature peak value and the early heat release amount are weakened, on the other hand, the self shrinkage and the temperature reduction shrinkage of the expansion compensation concrete are generated, the cracking resistance is improved by the cooperative regulation and control of the hydration rate and the shrinkage process, and the cracking of the concrete is inhibited.
3. The radiation cracking-resistant high-volume heavy concrete adopts the water-reducing type polycarboxylic acid high-performance water reducer, the shrinkage ratio of 28d is less than or equal to 100%, the shrinkage of the concrete is not increased, the working performance of the concrete is improved, meanwhile, the concrete is compacted, the mechanical performance and durability are improved, in addition, the homogeneity of the concrete, the pumping performance and the ultimate tensile value can be improved by properly air-entraining in the concrete, the workability of the concrete is improved, and the concrete cracking caused by excessive slurry floating during pouring is prevented.
Drawings
FIG. 1 is a schematic formulation of a radiation crack resistant high volume heavy concrete;
FIG. 2 is a schematic flow chart of a method for preparing radiation cracking resistant high-volume heavy concrete;
FIG. 3 is a schematic flow chart of a construction method of radiation cracking resistant heavy concrete;
FIG. 4 is a schematic illustration of roof and floor casting of a construction method for radiation resistant cracking high volume heavy concrete.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
Referring to fig. 1 to 4, the present invention provides a technical solution: the formula and the proportion of the radiation cracking resistant large-volume heavy concrete are as follows: cement 280, fly ash 50, mineral powder 50, an expanding agent 30, magnetite sand 600, magnetite ore 1650, yellow sand 400, water 150, an anticracking agent 32.8 and a water reducing agent 10.
A preparation method of radiation cracking resistant large-volume heavy concrete comprises the following specific steps:
step one: equipment reconstruction and upgrading measures; the method comprises the following specific steps:
(1) the method comprises the following steps The production line mixer blade is entirely replaced with a brand new abrasion-resistant blade and is specially used for heavy concrete mixing production;
(2) the method comprises the following steps The aggregate blanking bin and the weighing hopper of the production line are reinforced, so that the feeding safety of the iron ore sand and the stone is ensured;
(3) the method comprises the following steps The magnetite sand and Dan Zhuancang are piled up to prevent pollution.
Step two: preparing measures before production; the method comprises the following specific steps:
(1) the method comprises the following steps The iron ore sand and the stone bin are cleaned a week before the production plan, and are manually washed by a high-pressure water gun, so that the iron ore sand and the stone bin are effectively isolated from other materials and prevented from being polluted;
(2) the method comprises the following steps Informing the iron ore sand and gravel of the goods intake, requiring the transport by using a skip wagon, covering tarpaulin for rain protection, and ensuring that the quantity of the goods intake is sufficient, meeting the construction requirement and leaving the allowance;
(3) the method comprises the following steps After the iron ore and sand arrives at the station, a constructor is informed to dispatch a person to supervise weighing, the laboratory rapidly measures sand and Dan Hanshui rate, the constructor and the force ore should be about the water content range of the iron ore and sand in advance, and a forklift and 3-5 workers are organized to assist in unloading.
(4) The method comprises the following steps The iron ore sand and stone is fed from factory, strict quality detection is needed, re-detection is carried out from aspects of appearance, water content, density and the like, a week of organization is advanced to enter the special sand and stone aggregate for common large-volume anti-cracking concrete successively, and sufficient preparation is advanced according to the planned amount;
(5) the method comprises the following steps Preparing a special anti-cracking agent and a special water reducer 5 days in advance, and reserving a powder bin and a water reducer tank on each production line;
(6) the method comprises the following steps The cement and the fly ash are prepared three days in advance, so that sufficient inventory is ensured, the powder is naturally cooled, and the excessive temperature of the just-entered powder is prevented.
Step three: concrete production; according to the proportion of various raw materials, a proper amount of raw materials are prepared, and a production line is used for preparing concrete.
Step four: ensuring measures for concrete production; the method comprises the following specific steps:
(1) the method comprises the following steps In the production process of the proton center concrete of the production line, other project concrete plans uniformly stop production;
(2) the method comprises the following steps The production line exclusively produces heavy concrete, each plate of the heavy concrete is produced according to the formula of 1.5, and the stirring time is prolonged to two minutes;
(3) the method comprises the following steps Loading heavy concrete 6-8 times in a single pass of all tank trucks, and strictly prohibiting flushing of a discharging hopper by a driver before discharging is finished, and strictly prohibiting water addition;
(4) the method comprises the following steps The pouring speed of the heavy concrete pump truck is determined according to the actual situation of the site;
(5) the method comprises the following steps Common mass concrete is produced in special lines of other production lines;
(6) the method comprises the following steps Other production matters are carried out according to the usual production requirements;
(7) the method comprises the following steps And (3) reinforcing raw material management: before the concrete is produced by opening a disc, a quality inspector checks the corresponding conditions of raw materials and the mixing ratio in the bin, so that consistency is ensured;
(8) the method comprises the following steps And (5) strengthening factory acceptance: according to the requirement of 'disc inspection and vehicle inspection and acceptance', a full-time quality inspector performs concrete disc opening detection to ensure that the delivery qualification rate of concrete is 100%;
(9) the method comprises the following steps And (3) strengthening field quality supervision: ensuring that a quality inspector monitors the on-site concrete quality on site to perform timely feedback coordination when the concrete is supplied.
A construction method of radiation cracking resistant large-volume heavy concrete comprises the following specific steps:
step one: transportation regulations; the method comprises the following steps:
(1) the method comprises the following steps Before the concrete mixing truck receives materials, the accumulated water in the tank should be discharged;
(2) the method comprises the following steps During transportation and waiting for discharging, the normal rotation speed of the tank body of the concrete mixer truck should be kept, and the tank body must not stop rotating;
(3) the method comprises the following steps Before discharging, the tank body of the concrete mixing transport vehicle is preferably rapidly rotated and stirred for more than 20 seconds and then discharged;
when the concrete mixing transport vehicle is used for transportation, traffic safety commander should be arranged at the entrance and exit of the vehicle at the construction site, the road at the construction site should be smooth, and a circulating lane should be arranged under condition; the dangerous area should be set with warning sign; when in construction at night, good illumination is required;
(4) the method comprises the following steps Water is strictly forbidden in the concrete transportation, conveying and pouring processes; concrete scattered in the concrete transportation, conveying and pouring processes is strictly forbidden to be used for pouring the structure;
(5) the method comprises the following steps The stirring tank of the concrete transportation stirring truck is required to be subjected to heat preservation or heat insulation measures, the transportation and waiting time is not suitable to be longer than 90min, and the slump loss is controlled within an allowable value so as to ensure the mold-in slump of the concrete and the continuity of pouring;
(6) the method comprises the following steps Before pouring, construction organizations are reasonably arranged according to pouring amount, and difference between the setting time of a pouring body and the setting time under indoor standard conditions is distinguished, so that construction continuity is ensured, and cold joints are avoided.
Step two: planning a line; the distance from the stirring station to the project site is calculated, a plurality of alternative transportation lines are scheduled to pay attention to through GPS information in time, so that the supply is ensured to be free from traffic during the concrete construction period, and meanwhile, in order to avoid the phenomenon of congestion in the early and late peak periods, a standby line is selected before construction, and the congestion in the peak periods is avoided.
Step three: pouring concrete; the bottom plate and the top plate concrete pouring adopts a method of oblique pushing and layered pouring, each layer of pouring thickness is about 500mm, construction is organized in a mode of oblique pushing from a far end to a pump direction, the side wall adopts sectional pouring, and one-time pouring is controlled within 3400mm so as to ensure the verticality and pouring quality of the side wall, and the concrete steps are as follows:
(1) the method comprises the following steps The proton machine room bottom plate is poured for the first time, the pouring elevation is-4.410 m to-3.010 m, the plate thickness is 1400mm, the pouring volume is 650m3, one pump truck is expected to be used for pouring, each trolley is expected to pour 40m3 per hour, and the pouring is completed in 16 hours;
(2) the method comprises the following steps Casting the side wall for the second time, wherein the casting elevation is-3.010 m to-0.300 m, the casting height is 2.710m, the wall thickness is 1000-3350mm, the casting volume is 621m3, casting is expected to be carried out by using one pump truck, casting is carried out for 40m < 3 > per hour by using each truck, and the casting is completed in 16 hours;
(3) the method comprises the following steps Thirdly, pouring the side wall, wherein the pouring elevation is-0.300 m to 3.100m, the pouring height is 3.400m, the wall thickness is 1000-3350mm, the pouring volume is 778m3, one pump truck is expected to be used for pouring, each trolley is used for pouring 40m3 per hour, and the time is 20 hours for pouring to finish;
(4) the method comprises the following steps Pouring the side wall for the fourth time, wherein the pouring elevation is 3.100m to 5.520m, the pouring height is 2.420m, the wall thickness is 1000-3350mm, the pouring volume is 552m < 3 >, the pouring is expected to be performed by a pump truck, each trolley is poured for 40m < 3 > per hour, and the pouring is completed in 14 hours;
(5) the method comprises the following steps The fifth casting of the proton machine room top plate has the casting elevation of 5.520m to 6.270m, the plate thickness of 750mm and the casting volume of 350m3, and is expected to be cast by a pump truck, 40m3 is cast per hour by each truck, and the casting is completed within 9 hours.
(6) The method comprises the following steps Pouring a proton machine room top plate for the sixth to eighth times, wherein common concrete backfilling is adopted, the backfilling height is 3100mm, and the total backfilling is divided into three times, wherein the backfilling heights are 1000mm,1000mm and 1100mm;
step four: processing construction joints; in order to ensure the concrete pouring quality and avoid the influence of construction joints on radiation, the construction joints of all side walls are processed in a convex shape, and the construction joints with the elevation lower than 0.500m are provided with galvanized steel sheet water stops, so that the proton local horizontal structures are poured and formed at one time, and the generation of vertical construction joints is avoided;
step five: vibrating the concrete; the vibrator is adopted to vibrate, the insertion distance is not larger than one time of the vibration action radius of the vibrating rod, the insertion depth is about 50mm from the casting thickness to the lower layer mixture, the distance between the lower layer mixture and the side mould is 50-100mm, the displacement distance of the vibrator is suitable for enabling the vibrator flat plate to cover the vibrated part by about 100mm, the vibration time is preferably controlled within 10s-30s according to different conditions such as the slump of the mixture and the vibration part, the quick insertion and the slow extraction are realized, and the leakage vibration and the over vibration are avoided;
step six: curing the concrete; the method comprises the following steps:
(1) the method comprises the following steps Curing the concrete on the surface of the wall body with a mold, covering heat-insulating cotton, and spraying and moisturizing, wherein the curing time is more than or equal to 28d;
(2) the method comprises the following steps Curing the roof concrete by adopting a film, covering heat-insulating cotton, and spraying for moisturizing, wherein the curing time is more than or equal to 28 days;
(3) the method comprises the following steps The bottom plate concrete is cured by adopting a film and covered with heat preservation cotton, and is sprayed for preserving moisture, and the curing time is more than or equal to 28 days.
Step seven: measuring the temperature of mass concrete; the method comprises the following steps:
(1) the method comprises the following steps Arranging surface layer, bottom layer and central temperature measuring points along the thickness direction of the concrete pouring body, wherein the distance between the measuring points is not more than 500mm;
(2) the method comprises the following steps The surface temperature of the concrete casting body is preferably 50mm below the surface of the concrete casting body;
(3) the method comprises the following steps The temperature of the bottom layer of the concrete casting body is preferably 50mm above the bottom surface of the concrete casting body.
Step eight: controlling the temperature of the mass concrete; the method comprises the following steps:
(1) the method comprises the following steps Timely report of abnormality found by measurement personnel
(2) The method comprises the following steps The quality inspector inspects the temperature measurement and heat preservation conditions of the site every day
(3) The method comprises the following steps The measurement specialist archives the collected records to the data specialist.
In the embodiment, the cement is in the model of Adam P.O42.5, the fly ash is in the model of II, the mineral powder is in the model of S95, the expanding agent is in the model of magnesia expanding agent, the magnetite sand is large-smelting magnetite sand, the magnetite ore is large-smelting magnetite ore, the yellow sand is medium sand, the water is tap water, the anticracking agent is in the model of Su Bote HME-V, and the water reducer is in the model of Su Bote PCA-I.
In this embodiment, the fly ash must not use high-calcium fly ash or finely ground fly ash, and desulfurization and denitration ash which releases strong ammonia smell in the production process is strictly forbidden.
In this embodiment, the content of the needle-shaped particles in the magnetite ore should not be greater than 20%, the content of chloride ions should not be greater than 0.02%, the content of sulfide and sulfate should not be greater than 0.5%, and other performance indexes should meet the requirements of JGJ 52.
In the embodiment, clean medium coarse sand with low water absorption and small void ratio is adopted as the yellow sand, the fineness modulus is preferably 2.4-2.8, the fineness modulus is not lower than 2.3 and higher than 3.0, and the grain composition meets the requirement of a zone II; the mud content in the sand is less than or equal to 3.0%, the mud block content is less than or equal to 1.0%, sea sand, mountain sand and porous sand with serious efflorescence cannot be used, the water reducer uses the polycarboxylic acid high-performance water reducer with low shrinkage ratio, and the 28d drying shrinkage ratio is less than or equal to 100%.
In the embodiment, the anti-cracking agent is an expansion material prepared by a suspension kiln and taking light burned MgO as a main component, has the characteristics of adjustable expansion starting time, expansion rate, expansion ending time, expansion amount and the like, and is suitable for mass concrete or concrete structures with higher internal temperature rise.
In the seventh step, when the temperature is measured, the temperature measuring points are arranged at the position which is easy to crack as much as possible, and the highest temperature rise, the temperature difference between the inner surface and the outer surface, the temperature reduction rate and the environmental temperature in the concrete casting body are reflected truly.
In the seventh embodiment, the measurement is performed 1-3d after pouring, 4-7d after pouring, and 7d-14d after pouring, and 12 h.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. The radiation cracking resistant large-volume heavy concrete is characterized by comprising the following components in parts by weight: cement 280, fly ash 50, mineral powder 50, an expanding agent 30, magnetite sand 600, magnetite ore 1650, yellow sand 400, water 150, an anticracking agent 32.8 and a water reducing agent 10.
2. A method for preparing the radiation cracking resistant high-volume heavy concrete according to claim 1, which is characterized by comprising the following specific steps:
step one: equipment reconstruction and upgrading measures; the method comprises the following specific steps:
(1) the method comprises the following steps The production line mixer blade is entirely replaced with a brand new abrasion-resistant blade and is specially used for heavy concrete mixing production;
(2) the method comprises the following steps The aggregate blanking bin and the weighing hopper of the production line are reinforced, so that the feeding safety of the iron ore sand and the stone is ensured;
(3) the method comprises the following steps Stacking magnetite sand and Dan Zhuancang to prevent pollution;
step two: preparing measures before production; the method comprises the following specific steps:
(1) the method comprises the following steps The iron ore sand and the stone bin are cleaned a week before the production plan, and are manually washed by a high-pressure water gun, so that the iron ore sand and the stone bin are effectively isolated from other materials and prevented from being polluted;
(2) the method comprises the following steps Informing the iron ore sand and gravel of the goods intake, requiring the transport by using a skip wagon, covering tarpaulin for rain protection, and ensuring that the quantity of the goods intake is sufficient, meeting the construction requirement and leaving the allowance;
(3) the method comprises the following steps After the iron ore sand arrives at the station, notifying a constructor to send personnel to supervise weighing, rapidly measuring sand and Dan Hanshui rate in a laboratory, and the constructor defines the water content range of the iron ore sand in advance, and organizing a forklift and 3-5 workers to assist in unloading;
(4) the method comprises the following steps The iron ore sand and stone is fed from factory, strict quality detection is needed, re-detection is carried out from aspects of appearance, water content and density, a week of organization is advanced to sequentially enter sand and stone aggregate special for common large-volume anti-cracking concrete, and sufficient preparation is advanced according to the planned amount;
(5) the method comprises the following steps Preparing a special anti-cracking agent and a special water reducer 5 days in advance, and reserving a powder bin and a water reducer tank on each production line;
(6) the method comprises the following steps Cement and fly ash are prepared three days in advance, so that sufficient inventory is ensured, powder is naturally cooled, and the temperature of the just-fed powder is prevented from being too high;
step three: concrete production; preparing a proper amount of raw materials according to the proportion of various raw materials, and preparing concrete by using a production line;
step four: ensuring measures for concrete production; the method comprises the following specific steps:
(1) the method comprises the following steps In the production process of the proton center concrete of the production line, other project concrete plans uniformly stop production;
(2) the method comprises the following steps The production line exclusively produces heavy concrete, each plate of the heavy concrete is produced according to the formula of 1.5, and the stirring time is prolonged to two minutes;
(3) the method comprises the following steps Loading heavy concrete 6-8 times in a single pass of all tank trucks, and strictly prohibiting flushing of a discharging hopper by a driver before discharging is finished, and strictly prohibiting water addition;
(4) the method comprises the following steps The pouring speed of the heavy concrete pump truck is determined according to the actual situation of the site;
(5) the method comprises the following steps Common mass concrete is produced in special lines of other production lines;
(6) the method comprises the following steps Other production matters are carried out according to the usual production requirements;
(7) the method comprises the following steps And (3) reinforcing raw material management: before the concrete is produced by opening a disc, a quality inspector checks the corresponding conditions of raw materials and the mixing ratio in the bin, so that consistency is ensured;
(8) the method comprises the following steps And (5) strengthening factory acceptance: according to the requirement of 'disc inspection and vehicle inspection and acceptance', a full-time quality inspector performs concrete disc opening detection to ensure that the delivery qualification rate of concrete is 100%;
(9) the method comprises the following steps And (3) strengthening field quality supervision: ensuring that a quality inspector monitors the on-site concrete quality on site to perform timely feedback coordination when the concrete is supplied.
3. The construction method of the radiation cracking resistant high-volume heavy concrete according to claim 1, which is characterized by comprising the following specific steps:
step one: transportation regulations; the method comprises the following steps:
(1) the method comprises the following steps Before the concrete mixing truck receives materials, the accumulated water in the tank should be discharged;
(2) the method comprises the following steps During transportation and waiting for discharging, the normal rotation speed of the tank body of the concrete mixer truck should be kept, and the tank body must not stop rotating;
(3) the method comprises the following steps Before discharging, the tank body of the concrete mixing transport vehicle is preferably rapidly rotated and stirred for more than 20 seconds and then discharged;
when the concrete mixing transport vehicle is used for transportation, traffic safety commander should be arranged at the entrance and exit of the vehicle at the construction site, the road at the construction site should be smooth, and a circulating lane should be arranged under condition; the dangerous area should be set with warning sign; when in construction at night, good illumination is required;
(4) the method comprises the following steps Water is strictly forbidden in the concrete transportation, conveying and pouring processes; concrete scattered in the concrete transportation, conveying and pouring processes is strictly forbidden to be used for pouring the structure;
(5) the method comprises the following steps The stirring tank of the concrete transportation stirring truck is required to be subjected to heat preservation or heat insulation measures, the transportation and waiting time is not suitable to be longer than 90min, and the slump loss is controlled within an allowable value so as to ensure the mold-in slump of the concrete and the continuity of pouring;
(6) the method comprises the following steps Before pouring, the construction organization is reasonably arranged according to the pouring amount, and the difference between the setting time of a pouring body and the setting time under the indoor standard condition is distinguished, so that the construction continuity is ensured, and cold joints are avoided;
step two: planning a line; calculating the distance from a stirring station to a project site, scheduling a plurality of alternative transportation lines to pay attention to the project site in time through GPS information, ensuring that the supply is not influenced by traffic during the concrete construction period, and simultaneously, selecting a standby route before construction to avoid the congestion in the peak period in order to avoid the congestion phenomenon in the peak period in the morning and evening;
step three: pouring concrete; the bottom plate and the top plate concrete pouring adopts a method of oblique pushing and layered pouring, each layer of pouring thickness is about 500mm, construction is organized in a mode of oblique pushing from a far end to a pump direction, the side wall adopts sectional pouring, and one-time pouring is controlled within 3400mm so as to ensure the verticality and pouring quality of the side wall, and the concrete steps are as follows:
(1) the method comprises the following steps The proton machine room bottom plate is poured for the first time, the pouring elevation is-4.410 m to-3.010 m, the plate thickness is 1400mm, and the pouring volume is 650m 3 Casting with one pump truck is expected to be performed, and casting is expected to be performed for 40m per hour for each truck 3 The pouring is completed within 16 hours;
(2) the method comprises the following steps Casting the side wall for the second time, wherein the casting elevation is-3.010 m to-0.300 m, the casting height is 2.710m, the wall thickness is 1000-3350mm, and the casting volume is 621m 3 Casting with one pump truck is expected to be performed, and casting is expected to be performed for 40m per hour for each truck 3 The pouring is completed within 16 hours;
(3) the method comprises the following steps Thirdly, pouring the side wall, wherein the pouring elevation is-0.300 m to 3.100m, the pouring height is 3.400m, the wall thickness is 1000-3350mm, and the pouring volume is 778m 3 Casting with one pump truck is expected to be performed, and casting is expected to be performed for 40m per hour for each truck 3 The pouring is completed within 20 hours;
(4) the method comprises the following steps Fourthly, pouring the side wall, wherein the pouring elevation is 3.100m to 5.520m, the pouring height is 2.420m, the wall thickness is 1000-3350mm, and the pouring volume is 552m 3 Casting with one pump truck is expected to be performed, and casting is expected to be performed for 40m per hour for each truck 3 The pouring is completed within 14 hours;
(5) the method comprises the following steps Fifth pouring proton machine room top plate with pouring elevation of 5.520m to 6.270m, plate thickness of 750mm and pouring volume of 350m 3 Casting with one pump truck is expected to be performed, and casting is expected to be performed for 40m per hour for each truck 3 The pouring is completed within 9 hours;
(6) the method comprises the following steps Pouring a proton machine room top plate for the sixth to eighth times, wherein common concrete backfilling is adopted, the backfilling height is 3100mm, and the total backfilling is divided into three times, wherein the backfilling heights are 1000mm,1000mm and 1100mm;
step four: processing construction joints; in order to ensure the concrete pouring quality and avoid the influence of construction joints on radiation, the construction joints of all side walls are processed in a convex shape, and the construction joints with the elevation lower than 0.500m are provided with galvanized steel sheet water stops, so that the proton local horizontal structures are poured and formed at one time, and the generation of vertical construction joints is avoided;
step five: vibrating the concrete; the vibrator is adopted to vibrate, the insertion distance is not larger than one time of the vibration action radius of the vibrating rod, the insertion depth is about 50mm penetrating through the pouring thickness to the lower layer mixture, the distance between the vibrator and the side mould is 50-100mm, the displacement distance of the vibrator is proper to enable the vibrator flat plate to cover the vibrated part by about 100mm, the vibration time is preferably controlled within 10s-30s according to different conditions of the slump and the vibration part of the mixture, and quick insertion and slow extraction are realized, and leakage vibration and over vibration are avoided;
step six: curing the concrete; the method comprises the following steps:
(1) the method comprises the following steps Curing the concrete on the surface of the wall body with a mold, covering heat-insulating cotton, and spraying and moisturizing, wherein the curing time is more than or equal to 28d;
(2) the method comprises the following steps Curing the roof concrete by adopting a film, covering heat-insulating cotton, and spraying for moisturizing, wherein the curing time is more than or equal to 28 days;
(3) the method comprises the following steps Curing the bottom plate concrete by adopting a film, covering heat-insulating cotton, and spraying for moisturizing, wherein the curing time is more than or equal to 28 days;
step seven: measuring the temperature of mass concrete; the method comprises the following steps:
(1) the method comprises the following steps Arranging surface layer, bottom layer and central temperature measuring points along the thickness direction of the concrete pouring body, wherein the distance between the measuring points is not more than 500mm;
(2) the method comprises the following steps The surface temperature of the concrete casting body is preferably 50mm below the surface of the concrete casting body;
(3) the method comprises the following steps The bottom layer temperature of the concrete casting body is preferably 50mm above the bottom surface of the concrete casting body;
step eight: controlling the temperature of the mass concrete; the method comprises the following steps:
(1) the method comprises the following steps The measurement personnel find out the abnormality and report in time;
(2) the method comprises the following steps The quality inspector inspects the condition of site temperature measurement and heat preservation every day;
(3) the method comprises the following steps The measurement specialist archives the collected records to the data specialist.
4. The radiation resistant cracking heavy weight concrete of claim 1, wherein: the model of the fly ash is II level, the model of the mineral powder is S95, the model of the expanding agent is magnesia expanding agent, the yellow sand is medium sand, and the water is tap water.
5. The radiation resistant cracking heavy weight concrete of claim 1, wherein: the fly ash cannot use high-calcium fly ash or finely ground fly ash, and desulfurization and denitration ash which releases strong ammonia smell in the production process is strictly forbidden.
6. The radiation resistant cracking heavy weight concrete of claim 1, wherein: the content of needle-shaped particles in the magnetite ore is not more than 20%, the content of chloride ions is not more than 0.02%, the content of sulfides and sulfates is not more than 0.5%, other performance indexes meet the regulations, and in order to ensure that the iron ore meeting the specific gravity and grading is supplied, the broken iron ore needs to be subjected to ore dressing for two times, and the iron ore which does not meet the requirements is removed, so that the quality requirement is met.
7. The radiation resistant cracking heavy weight concrete of claim 1, wherein: the yellow sand adopts clean medium coarse sand with low water absorption and small void ratio, the fineness modulus is preferably 2.4-2.8, the fineness modulus is not lower than 2.3 and higher than 3.0, and the grain composition meets the requirement of a zone II; the mud content in the sand is less than or equal to 3.0%, the mud block content is less than or equal to 1.0%, sea sand, mountain sand and porous sand with serious efflorescence cannot be used, the water reducer uses the polycarboxylic acid high-performance water reducer with low shrinkage ratio, and the 28d drying shrinkage ratio is less than or equal to 100%.
8. The radiation resistant cracking heavy weight concrete of claim 1, wherein: the anti-cracking agent adopts the expansion material prepared by the suspension kiln and taking light burned MgO as the main component, has the characteristics of adjustable expansion starting time, expansion rate, expansion ending time and expansion amount, and is suitable for mass concrete or concrete structures with higher internal temperature rise.
9. A construction method according to claim 3, wherein: in the seventh step, when the temperature measurement is carried out, the temperature measurement points are arranged at the position which is easy to crack as much as possible, and the highest temperature rise, the interior-exterior temperature difference, the temperature reduction rate and the environmental temperature in the concrete pouring body are reflected truly.
10. A construction method according to claim 3, wherein: in the seventh step, the measurement is carried out 1-3d after pouring, 4-7d after pouring, and 7d-14d after pouring, and 12 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210289147.1A CN114750282B (en) | 2022-03-22 | 2022-03-22 | Radiation cracking-resistant large-volume heavy concrete and preparation method and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210289147.1A CN114750282B (en) | 2022-03-22 | 2022-03-22 | Radiation cracking-resistant large-volume heavy concrete and preparation method and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114750282A CN114750282A (en) | 2022-07-15 |
| CN114750282B true CN114750282B (en) | 2023-05-30 |
Family
ID=82326344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210289147.1A Active CN114750282B (en) | 2022-03-22 | 2022-03-22 | Radiation cracking-resistant large-volume heavy concrete and preparation method and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114750282B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115838272A (en) * | 2022-12-24 | 2023-03-24 | 中建三局第一建设工程有限责任公司 | Ultrahigh-density anti-neutron radiation concrete and construction method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2336404A1 (en) * | 1972-07-17 | 1974-01-31 | Inst De Studii Si Proiectari H | PROCESS FOR MANUFACTURING CONCRETE PRODUCTS |
| SU817012A1 (en) * | 1979-06-06 | 1981-03-30 | Львовский Ордена Ленина Политехническийинститут | Raw mixture for producing filler |
| KR20040052532A (en) * | 2004-02-26 | 2004-06-23 | 김기호 | The method of forming the Black Color Cement and Concrete by the Addition of Magnetite Powders. |
| JP2007015880A (en) * | 2005-07-06 | 2007-01-25 | Nippon Steel & Sumikin Stainless Steel Corp | Heavy weight aggregate and heavy concrete, and manufacturing method thereof |
| WO2020022992A2 (en) * | 2018-04-18 | 2020-01-30 | Fibrobeton Yapi Elemanlari Sanayi Insaat Ve Ticaret Anonim Sirketi | Radiation-impermeable and radon gas-tight fiber-reinforced concretes |
| CN111875314A (en) * | 2020-07-22 | 2020-11-03 | 北京怀建混凝土有限责任公司 | Radiation-proof concrete and preparation method thereof |
| CN112661458A (en) * | 2020-12-25 | 2021-04-16 | 北京金隅混凝土有限公司 | Crack-resistant large-volume concrete and preparation method thereof |
| CN112851223A (en) * | 2021-02-25 | 2021-05-28 | 山东阳华建筑安装工程有限公司 | Radiation-proof concrete and production process thereof |
-
2022
- 2022-03-22 CN CN202210289147.1A patent/CN114750282B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2336404A1 (en) * | 1972-07-17 | 1974-01-31 | Inst De Studii Si Proiectari H | PROCESS FOR MANUFACTURING CONCRETE PRODUCTS |
| SU817012A1 (en) * | 1979-06-06 | 1981-03-30 | Львовский Ордена Ленина Политехническийинститут | Raw mixture for producing filler |
| KR20040052532A (en) * | 2004-02-26 | 2004-06-23 | 김기호 | The method of forming the Black Color Cement and Concrete by the Addition of Magnetite Powders. |
| JP2007015880A (en) * | 2005-07-06 | 2007-01-25 | Nippon Steel & Sumikin Stainless Steel Corp | Heavy weight aggregate and heavy concrete, and manufacturing method thereof |
| WO2020022992A2 (en) * | 2018-04-18 | 2020-01-30 | Fibrobeton Yapi Elemanlari Sanayi Insaat Ve Ticaret Anonim Sirketi | Radiation-impermeable and radon gas-tight fiber-reinforced concretes |
| CN111875314A (en) * | 2020-07-22 | 2020-11-03 | 北京怀建混凝土有限责任公司 | Radiation-proof concrete and preparation method thereof |
| CN112661458A (en) * | 2020-12-25 | 2021-04-16 | 北京金隅混凝土有限公司 | Crack-resistant large-volume concrete and preparation method thereof |
| CN112851223A (en) * | 2021-02-25 | 2021-05-28 | 山东阳华建筑安装工程有限公司 | Radiation-proof concrete and production process thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114750282A (en) | 2022-07-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108101456A (en) | A kind of big water absorption rate coarse aggregate high-performance marine concrete and its construction | |
| CN110966022B (en) | Railway tunnel lining construction method based on medium-high fluidity concrete | |
| CN103936360B (en) | A kind of preparation of high efficient concrete and preparation method thereof | |
| CN103723968B (en) | Nuclear power station PX pump house volute pump structure is with concrete and build the method for moulding | |
| CN101922236B (en) | C50 machine-made sand ultra-high pump concrete construction method | |
| CN105666687B (en) | Prestressing force Reactive Powder Concrete box girder construction technique | |
| CN114750282B (en) | Radiation cracking-resistant large-volume heavy concrete and preparation method and construction method thereof | |
| CN107216087A (en) | A kind of construction premixing mortar green construction method | |
| CN103572966A (en) | Construction method for silo funnel liner | |
| CN105672508B (en) | A kind of baryte radiation proof construction and its construction method | |
| CN112608079A (en) | Method for recycling waste concrete | |
| CN110820750A (en) | Self-compacting concrete construction method | |
| CN106192623A (en) | CRTS III template self-compacting concrete pouring construction equipment and workflow | |
| CN105201101A (en) | Light aggregate concrete small hollow block building masonry construction method | |
| CN111497003A (en) | Production process of prefabricated overhaul small stand column | |
| CN113929378A (en) | Oil shale semicoke and application of modified material thereof | |
| CN202088302U (en) | Nuclear power engineering concrete production system | |
| CN111039619A (en) | Prefabricated staircase of assembled recycled aggregate lightweight concrete | |
| CN103612318B (en) | Full-automatic composite self-insulation building block production method | |
| CN215472128U (en) | Multifunctional concrete production device and multifunctional wallboard production line | |
| CN104712144A (en) | Neutron radiation resisting barite low hydration heat concrete construction technology | |
| CN108751926A (en) | The cast-in-place phosphorus magnesium concrete of prefabricated node of column and beam based on phosphorus magnesium material and construction method | |
| CN112681137A (en) | Concrete distribution method for post-cast strip of track beam | |
| CN104786369A (en) | Non-industrialized sleeper-prefabricating construction method | |
| CN111548107A (en) | Alkali slag concrete construction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |