CN103723968B - Nuclear power station PX pump house volute pump structure is with concrete and build the method for moulding - Google Patents
Nuclear power station PX pump house volute pump structure is with concrete and build the method for moulding Download PDFInfo
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- 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
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Abstract
The present invention relates to a kind of nuclear power station PX pump house volute pump structure concrete, the concrete of every cubic metre consists of: P II cement 261 ~ 296kg, silicon ash 27 ~ 40kg, flyash 88 ~ 110kg, aluminium sulfate class swelling agent 35 ~ 44kg, polypropylene fibre 0.9kg, compounded amino alcohols reinforcing steel bar corrosion inhibitor 12kg, polycarboxylate dehydragent 6.63-8.62kg, coarse aggregate 1068 ~ 1095kg, fine aggregate 644 ~ 676kg, water 166kg. The invention still further relates to the method that adopts this nuclear power station PX pump house volute pump structure concreting moulding. Nuclear power station PX pump house volute pump structure of the present invention has excellent cracking resistance with concrete, and there is high-durability, can guarantee nuclear power station run duration, its xoncrete structure can be because seawater corrosion destroys, and then ensure the safe and reliable operation in nuclear power station lifetime.
Description
Technical field
The present invention relates to building material field, especially there is high permeability resistant, high resistance chemical corrosion, high cracking resistanceUsed in nuclear power station volute pump concrete and build the concrete method of volute shape.
Background technology
Fuqing nuclear power engineering is the large project going into operation during national 11th Five-Year, overall planning six hundredTen thousand multikilowatt nuclear power generating sets, adopt rely on M310 heap type improved domestic two generation half nuclear power generating sets, current 1～4Unit is built successively. In the underground engineering structure concrete of conventional island steam turbine factory building and PX pump house, largeAmount has been used polypropylene fibre compensate for shrinkage water-proof concrete, strength grade of concrete from C35～C45 do not wait (with60 days compression strength is acceptance criteria). Wherein PX pump house volute pump xoncrete structure is that shape is very complicatedAbnormally-structured, and structural volume is thick large, and structural base and internal-wall concrete construction are watered and are smash very difficulty, and engineering is establishedCounting service life is 50 years, belongs to not maintainable permanent xoncrete structure in the nuclear power station service life phase,Directly related with nuclear safety. Its residing working environment is immersed among seawater all the year round, and internal-wall concrete structure is wantedYear in year out stand washing away and corroding of seawater, if xoncrete structure exists crack or other defect, will leadCause the corrosion that inner reinforcing bar is subject to seawater, and then damage monolithic concrete structure, have influence on the safety of nuclear power generating setsOperation. Therefore, require mixing concrete thing to have excellent service behaviour, the xoncrete structure after building hasGood cracking resistance, anti-permeability performance, do not allow to produce harmful cracks, and can bear flowing seawater year in year outWash away abrasion, guarantee that reinforcement in concrete is not corroded, realize the high-durability of concrete structure engineering. AndThe nuclear power station PX pump house volute pump xoncrete structure that application existing concrete formula is built, is subject to concrete at that timeThe restriction of code for structural design and associated minerals admixture operating specification, builds the PX pump house volute pump of formation and tiesThe compression strength of structure, water resistant permeance property, crack resistance etc. are all not ideal.
Summary of the invention
The object of the present invention is to provide a kind of nuclear power station PX pump house volute pump structure concrete, it has overcomeDeficiency of the prior art, has high chloride ion impermeability, high resistance chemical corrosion, high cracking resistance, and it flowsProperty is good.
A kind of nuclear power station PX pump house volute pump structure concrete, the concrete of every cubic metre consists of: PIICement 261～296kg, silicon ash 27～40kg, flyash 88～110kg, aluminium sulfate class swelling agent 35～44kg,Polypropylene fibre 0.9kg, compounded amino alcohols reinforcing steel bar corrosion inhibitor 12kg, polycarboxylate dehydragent 6.63-8.62kg,Coarse aggregate 1068～1095kg, fine aggregate 644～676kg, water 166kg; Described PII cement is that alkali content is littleIn 0.6% low alkali cement, the C in cement3A content is less than 5%, C3S content is less than 55%, and must not mix in described cementAdd kiln ash;
Amorphous Si O in described silicon ash2Content account for 90% of gross mass;
Described flyash is F class I level;
The mean molecule quantity of described polypropylene fibre is 180000～300000;
The ballast grain sizes of described coarse aggregate is 5～25mm;
Described fine aggregate belongs to II district medium sand (modulus of fineness is 2.6 ± 0.2).
The present invention does not have special requirement to aluminium sulfate class swelling agent, as long as such swelling agent all can, excellentChoosing, described aluminium sulfate class swelling agent is HEA type swelling agent. Aluminium sulfate class swelling agent is anti-crack water-proof agent,Mainly by C3A·3CaSO4·32H2O and Ca (OH)2Two kinds of expansion sources are composited, and initially harden at concreteRear intensity is in the rapid growth phase, and concrete can produce shrinkage stress, and the expansion energy that anti-crack water-proof agent produces,In xoncrete structure, set up appropriate compressive pre-stress, can the concrete shrinkage stress of effective compensation, reduce andSuppress the contraction fissure after concrete hardening.
The length of described polypropylene fibre is 19mm ± 2mm, and nominal diameter is 31.5 μ m; Density:0.91g/cm3. Above-mentioned polypropylene fibre plays action of crack arrest to the concrete in the plastic stage, is mainly logicalCross to reduce and suppress concrete plastic set crack and plastic shrinkage cracks and reach resistance and split effect.
The model that described silicon ash is provided by Shanghai Tian Kai silica flour Materials Co., Ltd is TOPKEN900D, silicon ashAverage grain particle diameter be 0.1 μ m, only for cement granules more than one percent, surface area is approximately15000m2/ kg, has two kinds of advantages of volcanic ash effect and effect of particle size, can significantly improve secreting of fresh concreteWater-based and cohesiveness, improved the bond strength of cement slurry and aggregate, thereby make concrete wearability alsoBe improved.
Nuclear power station PX pump house volute pump structure of the present invention with concrete by low alkali cement and silicon ash, powderMixing altogether of coal ash, swelling agent, gives full play to the super synergistic effect of Binder Materials, simultaneously admixture New Building MaterialsPolypropylene fibre and compounded amino alcohols reinforcing steel bar corrosion inhibitor, realize the protection to Steel Bars in Concrete Structure jointly,Guarantee the high-durability of xoncrete structure, especially high chloride ion impermeability.
Described flyash is F class I level, can significantly reduce concrete water consumption, increases concrete flowingProperty. With silicon ash mix altogether can be fine performance fill effect and pozzolanic reaction makes concrete become finer and close.
The present invention does not have special requirement to compounded amino alcohols reinforcing steel bar corrosion inhibitor, as long as the reinforcing bar resistance of this kindRust agent all can be used. Compounded amino alcohols reinforcing steel bar corrosion inhibitor by dispersed component, resistance rust component, antiseptic ingredient withAnd other function ingredients is composited through Proper Match, be light green transparency liquid. Its resistance rust mechanism can be generalDraw together for: when corrosion inhibitor molecule arrives when rebar surface, progressively form the stable unimolecule of one deck or multimolecular film,General this tunic molecule is approximately perpendicular to metal surface and is arranged in parallel, and hydrophilic radical is combined with reinforcing bar, and hydrophobic groupGroup forms hydrophobic barrier moisture and chlorion etc. and reinforcing bar is isolated.
The present invention does not have special requirement to polycarboxylate dehydragent, as long as this kind can be used for concreteWater reducer all can use. Polycarboxylate dehydragent is the polymer with sulfonic group, carboxylic acid group, ehter bond, is lightYellow transparent liquid. Can improve concrete mobility. Due to silicon ash diminishing not in concrete, and hydrophobic,Its water demand ratio can reach 134%; Mixing of polypropylene fibre also can reduce concrete mobility greatly, increasesThe large concrete water consumption of folk prescription. By being combined with of polycarboxylate dehydragent, folk prescription coagulation can reducedWhen soil water consumption, keep the good fluidity of mixing concrete thing to be beneficial to construction.
The ballast grain sizes of described coarse aggregate, in 5～25mm scope, reduces the stress difference at aggregate cement mortar interface,Reduce or eliminate inside concrete micro crack.
Water can be to meet drinking of existing national standard " standards for drinking water quality " GB5749 requirementWater.
The flyash and the silicon ash that in concrete, mix quality of the present invention, be conducive to the improvement of cracking resistance,Especially mixing of appropriate flyash and anti-crack water-proof agent, can to a certain degree reduce concrete self-constriction, with siliconAsh is mixed altogether both can bring into play and is mixed the advantage that silicon ash concrete charge pass significantly reduces and early strength easily ensures, can press down againSystem is mixed silicon ash and more easily occurs the effect of early stage desciccation crack. In addition, the mixing of building material " polypropylene fibre ",Can reduce and suppress sedimentation or the contraction fissure of concrete plastic stage, reduce the capillary of xoncrete structure insidePipe porosity, the crack that simultaneously effectively suppresses volute pump concrete inner wall surface produces.
The method that adopts above-mentioned nuclear power station PX pump house volute pump structure concreting moulding, comprises following stepRapid:
1) take after each component each component is mixed, stir, be poured into mould, concrete molding temperature shouldBe less than 30 DEG C, and concrete enters the temperature of mould front template and reinforcing bar and near local temperature all should not exceed40℃；
When cast, concrete is taked overall layering or the formula of passing continuous placing, and every layer concrete thickness must be controlled at30～50cm, should be before lower-layer concrete initial set, completes that upper strata is concrete builds covering;
Adopt internal vibration rod to concrete vibrating, internal vibration rod should be inserted and pull out slowly soon, and slotting point will evenly be arrangedRow, pointwise is moved, and order is carried out, and must not omit; The moving interval of internal vibration rod is not more than vibrating spear and doesWith 1.5 times of radius, while vibrating last layer, should insert lower one deck 5～10cm, so that two layer concretes are in conjunction with jailGu; Vibrating spear must not touch reinforcing bar and template, or else heavy to concrete when vibrating, without significantly bubble rising,There is pellicular water mud in concrete surface, when surface reaches smooth, has vibrated;
2) concrete vibrating completed after 3～5 hours, and concrete surface is smeared to pressure again, and at concreteAfter final set, cover the wet piece of sack immediately at concrete surface, then covered with plastic film, covers above plastic sheeting againCover the dry piece of sack or colour bar cloth, regularly water spray remains that concrete surface is in moisture state.
The temperature rise value of the concrete casting building body forming after concreting in step 1) on molding temperature basis is notShould exceed 40 DEG C, in concrete casting building body, show the temperature difference and be no more than 25 DEG C, and not contain the equivalent temperature of concrete shrinkageDegree; The rate of temperature fall of concrete casting building body is 2.0 DEG C/d; Concrete surface and atmosphere temperature-difference are no more than 20 DEG C.
In step 1), when concrete casting injects mould, its blanking highly should not exceed 2m; Build vertical or blockWhen structural concrete, concrete discharging opening must not be less than 50mm from side template inner side, and same local concrete is piled upThickness does not exceed 30～50cm.
In step 1), in the time of high temperature season casting concrete, take the mode of mixing chilled water or ice bits to the greatest extent canCan reduce concrete molding temperature, avoid template and the concrete of newly building is directly exposed to sunlight as far as possible.
Step 2) in, when construction environment relative humidity is less, wind speed is when larger, should be timely after concrete formationCovered with plastic film, to stop scattering and disappearing of the moisture content that is evaporated in concrete, allows it again change into aqueous waterReturn and moistening concrete surface.
The above-mentioned concrete method of volute shape of building, also comprises follow-up maintenance processes, and concrete steps are as follows
(1) send special messenger to check concrete surface, as dry in concrete surface, implement immediately manually to water fosterProtect, curing water can not directly water on concrete surface, but evenly waters the wet piece of sack below plastic sheetingUpper, make the piece of sack fully moistening, keep whole concrete surface to be moisture state;
(2) in concreting after 7 days, Side shuttering is removed, then first moistening in concrete surface wateringAfter, adopt immediately plastic sheeting parcel tight, plastic sheeting will be close to concrete surface, not crack, stuffy,Outside hangs up geotextiles again; Within the maintenance time limit, will there is the globule in concrete surface all along; To often examineLook into the integrality of film, should repair in time complete if any breakage;
(3) the volute shape inner wall form of volute shape xoncrete structure and support need to treat that intensity reaches design strengthAfter grade, could remove, otherwise can only be curing in the mold.
The frequency of above-mentioned water seasoning should be determined in conjunction with concrete measuring temperature situation, and concrete temperature is erected from watering,While being temperature measuring head Transducers Embedded in Concrete, just monitor, every 2h surveys once. 3-4d after concreting, every 4hSurvey once, the every 8h of 5-7d surveys once, analyzes in time the temperature measurement data of every day, draws temperature-time graph,After entering safe range, each position temperature difference cancels insulation. The thermometric time limit should comprise concrete internal temperature from heat up,High temperature, the environment temperature and remove insulation of lowering the temperature, level off to, enter the overall process of safe range, and the thermometric time is formerUpper continuity 14d, answers the proper extension thermometric time if desired.
In step (3), strong concrete when concrete striking time not only will be considered form removal is outside one's consideration, and also shouldConcrete temperature while considering form removal can not be too high, ftractures in order to avoid lower the temperature too fast when concrete contact air,More can not water at this moment cold water maintenance. Inside concrete starts before cooling and when concrete internal temperature is the highestMust not form removal, in structure or concrete members, show that the temperature difference is greater than 25 DEG C, concrete surface and atmosphere temperature-difference is largeUnsuitable form removal in the time of 20 DEG C. Unsuitable form removal when strong wind or temperature sharply change. In hot and strong wind dry season,The form removal technique that should take form removal piecemeal, cover while tear open.
Nuclear power station PX pump house volute pump structure of the present invention is utilized industrial waste rationally with concrete, realizeWhen energy-saving and emission-reduction, obtain homogenous material and mixed the beneficial functions that cannot produce, obtained and there is excellent resistingThe concrete of fragility energy; And have high-durability, can guarantee nuclear power station run duration, its xoncrete structure is notCan destroy because of seawater corrosion, and then ensure the safe and reliable operation in nuclear power station lifetime.
Detailed description of the invention
Further illustrate the present invention below in conjunction with specific embodiment.
The type that " the HEA type swelling agent " using in embodiment produced for Jiangxi Wuguan New Material Co., Ltd.Number be WG-HEA type anti-crack water-proof agent.
" the compounded amino alcohols reinforcing steel bar corrosion inhibitor " using in embodiment is the production of west card (China) Co., LtdModel be SikaFerroGard901.
" fine aggregate " using in embodiment is the Min River medium sand of the hard cleaning of quality, is non-basic active aggregate.
The length of " polypropylene fibre " using in embodiment is 19mm ± 2mm, and nominal diameter is 31.5 μ m;Density: 0.91g/cm3。
" the PII cement " that in embodiment, uses is the low alkali cement that alkali content is less than 0.6%, in cementC3A content is less than 5%, C3S content is less than 55%, and must not admixture kiln ash in described cement.
Table 1 be in each embodiment every cubic metre the each component of nuclear power station PX pump house volute pump structure in concrete andIts content.
Table 1
Adopt 2m3Planetary twin-shaft mixer group fully stirs mixed each component, except poly-thirdAlkene fiber is pressed folk prescription consumption quantitative package (composition of water soluble package is consistent with polypropylene), adopts artificial sideOutside formula feeds intake, other raw material all adopt automatic gauge, automatic charging mode to add in mixer and stir,The concrete-agitating time is 75 seconds, then after being transported to job location, concreting is entered to mould, and concrete enters mouldTemperature should be less than 30 DEG C, and concrete enters the temperature of mould front template and reinforcing bar and near local temperature all notShould exceed 40 DEG C; The temperature rise value of the concrete casting building body forming after concreting on molding temperature basis is notShould exceed 40 DEG C, in concrete casting building body, show the temperature difference and be no more than 25 DEG C, and not contain the equivalent of concrete shrinkageTemperature; The rate of temperature fall of concrete casting building body is 2.0 DEG C/d; Concrete surface and atmosphere temperature-difference are no more than 20 DEG C.In the time of high temperature season casting concrete, the mode of taking to mix chilled water or ice bits reduce as far as possible concrete enterMould temperature is avoided template as far as possible and the concrete of newly building is directly exposed to sunlight.
When concrete casting injects mould, its blanking highly should not exceed 2m; Building vertical or block structure concreteTime, concrete discharging opening must not be less than 50mm from side template inner side, and same local concrete ulking thickness is not superGo out 30～50cm. When cast, concrete is taked overall layering or the formula of passing continuous placing, every layer concrete thicknessMust be controlled at 30～50cm, should be before lower-layer concrete initial set, complete that upper strata is concrete builds covering. BetweenThe maximum duration of having a rest should be determined by cement type used, temperature and concrete coagulation condition, and must not be greater than coagulationThe presetting period of soil.
Adopt internal vibration rod to concrete vibrating, internal vibration rod should be inserted and pull out slowly soon, and slotting point will evenly be arrangedRow, pointwise is moved, and order is carried out, and must not omit; The moving interval of internal vibration rod is not more than vibrating spear and doesWith 1.5 times of radius, be generally 30～40cm, while vibrating last layer, should insert lower one deck 5～10cm, so thatTwo layer concretes are in conjunction with firm; Vibrating spear must not touch reinforcing bar and template, or else not heavy to concrete when vibrating,Without significantly bubble rising, there is pellicular water mud in concrete surface, when surface reaches smooth, has vibrated.
Concrete vibrating completed after 3～5 hours, and concrete surface is smeared to pressure again, and at concrete eventuallyAfter solidifying, cover the wet piece of sack immediately at concrete surface, then covered with plastic film, covers above plastic sheeting againThe dry piece of sack or colour bar cloth, regularly water spray remains that concrete surface is in moisture state; When construction environment phaseWhen, wind speed less to humidity is larger, covered with plastic film in time after concrete formation, to stop in concreteScattering and disappearing of the moisture content being evaporated, allows it again change into aqueous water and returns to also moistening concrete surface.
Above-mentioned building after volute shape pouring concrete completes, will carry out the maintenance in later stage, send special messenger to check coagulationSoil surface, as dry in concrete surface, implement immediately artificial water seasoning, curing water can not directly water mixedSolidifying soil surface is upper, but evenly waters on the wet piece of sack below plastic sheeting, makes the piece of sack fully moistening, protectsHold whole concrete surface and be moisture state. The frequency of water seasoning should be determined in conjunction with concrete measuring temperature situation, mixedSolidifying native temperature is erected from watering, and when temperature measuring head Transducers Embedded in Concrete, just monitors, and every 2h surveys once. CoagulationSoil is built rear 3-4d, and every 4h surveys once, and the every 8h of 5-7d surveys once, analyzes in time the temperature measurement data of every day, drawsTemperature-time graph is cancelled insulation after each position temperature difference enters safe range. The thermometric time limit should comprise coagulationSoil internal temperature, from intensification, high temperature, the environment temperature and remove insulation of lowering the temperature, level off to, enters safe rangeOverall process, continues 14d in thermometric time principle, answers if desired the proper extension thermometric time.
In concreting, after 7 days, Side shuttering is removed, then first after concrete surface watering is moistening, verticalAdopt plastic sheeting parcel tight, plastic sheeting will be close to concrete surface, not crack, stuffy, outsideHang up again geotextiles; Within the maintenance time limit, will there is the globule in concrete surface all along; Want running check thinThe integrality of film, should repair complete if any breakage in time. The volute shape inner wall form of volute shape xoncrete structure andSupport need to, after intensity reaches design strength grade, could be removed, otherwise can only be curing in the mold, does not takeOther measure. The volute shape inner wall form of volute shape xoncrete structure and the striking time of support not only will be considered to tear openStrong concrete when mould is outside one's consideration, and the concrete temperature while also should be taken into account form removal can not be too high, in order to avoid concrete jointWhile touching air, lower the temperature too fast and ftracture, more can not water at this moment cold water maintenance. Inside concrete starts before coolingAnd concrete internal temperature must not form removal when the highest, in structure or concrete members, show the temperature difference be greater than 25 DEG C,Unsuitable form removal when concrete surface and atmosphere temperature-difference are greater than 20 DEG C. Unsuitable form removal when strong wind or temperature sharply change.In hot and strong wind dry season, the form removal technique that should take form removal piecemeal, cover while tear open.
Finish in xoncrete structure maintenance, after template complete removal, concrete surface and sidewall are not all found naked eyesVisible crack, just exists and loosens on volute shape internal-wall concrete part top layer, has occurred a small amount of on part surfaceMicroscopic checks (volute shape internal-wall concrete architecture quality is most critical Essentials for quality control), fracture width after testingAll be less than 0.2mm, degree of depth deficiency 5mm, is harmless shallow table crack, and design side is to overall volute pump coagulationSoil structure quality is satisfied with very much.
Analyzing causes of cracks, is mainly need to treat that with volute shape inner wall form and support intensity reaches design by forceDegree could be removed after grade, cannot take to be incubated, moist keeping measures is relevant; And the entrance of volute shape structure inner chamber does not haveBlock, extraneous wind-force is blown into along entrance, has formed convolution at inner chamber, has accelerated internal-wall concrete surfaceDry dehydration.
Loosening of top layer, is because inside configuration reinforcing bar is intensive, and planform complexity, causes inwall place mixedThe vibrating of solidifying soil not fully causes.
For the long-term safety of guaranteeing xoncrete structure is used, adopt giant to remove surperficial weaker zone, andAdopt epoxy resin pressure grouting to repair, sealed all cracks
In whole volute pump concrete pouring construction process, concrete has represented good workability, althoughPumping line pipeline reaches more than 200 meter, and the drop of pumping also has more than 30 meters, but casting process is very smooth.The performance parameter that obtains volute shape concrete casting injection body is in table 2:
Table 2
Claims (8)
1. a nuclear power station PX pump house volute pump structure concrete, is characterized in that the concrete of every cubic metre consists of:PII cement 261～296kg, silicon ash 27～40kg, flyash 88～110kg, aluminium sulfate class swelling agent 35～44kg, poly-Tacryl 0.9kg, compounded amino alcohols reinforcing steel bar corrosion inhibitor 12kg, polycarboxylate dehydragent 6.63-8.62kg, coarse aggregate1068～1095kg, fine aggregate 644～676kg, water 166kg;
Described PII cement is the low alkali cement that alkali content is less than 0.6%, the C in cement3A content is less than 5%, C3S containsAmount is less than 55%, and must not admixture kiln ash in described cement;
Amorphous Si O in described silicon ash2Content account for 90% of gross mass;
Described flyash is F class I level;
The mean molecule quantity of described polypropylene fibre is 180000～300000;
The ballast grain sizes of described coarse aggregate is 5～25mm;
Described fine aggregate belongs to II district medium sand, and modulus of fineness is 2.6 ± 0.2.
2. nuclear power station PX pump house volute pump structure concrete according to claim 1, is characterized in that described sulphur aluminiumBarbiturates swelling agent is HEA type swelling agent.
3. nuclear power station PX pump house volute pump structure concrete according to claim 1 and 2, is characterized in that instituteThe length of stating polypropylene fibre is 19mm ± 2mm, and nominal diameter is 31.5 μ m.
4. nuclear power station PX pump house volute pump structure concrete according to claim 3, is characterized in that described siliconThe model that ash is provided by Shanghai Tian Kai silica flour Materials Co., Ltd is TOPKEN900D.
5. the nuclear power station PX pump house volute pump structure concrete casting described in the arbitrary claim of employing claim 1 to 4Build up the method for type, it is characterized in that comprising the steps:
1) take after each component each component is mixed, stir, pour into the mold, concrete molding temperature should be less than 30 DEG C,And temperature and near local temperature that concrete enters mould front template and reinforcing bar are all no more than 40 DEG C;
While building, concrete is taked overall layering or the formula of passing continuous placing, and every layer concrete thickness must be controlled at 30～50cm,Should be before lower-layer concrete initial set, complete that upper strata is concrete builds covering;
Adopt internal vibration rod to concrete vibrating, internal vibration rod should be inserted and pull out slowly soon, and slotting point is evenly distributed, pointwiseMobile, order is carried out, and must not omit; The moving interval of internal vibration rod is not more than 1.5 times of vibrating spear operating radius,Should insert lower one deck 5～10cm, so that two layer concretes are in conjunction with firm while vibrating last layer; Vibrating spear must not touch reinforcing bar andTemplate, when vibrating to concrete no longer to sink, rises without remarkable bubble, and pellicular water mud appears in concrete surface, and surface reachesVibrate when smooth;
2) concrete vibrating completed after 3～5 hours, and concrete surface is smeared to pressure again, and vertical after concrete final setCover the wet piece of sack at concrete surface, then covered with plastic film, covers the dry piece of sack or colour bar again above plastic sheetingCloth, regularly water spray remains that concrete surface is in moisture state.
6. method of building moulding according to claim 5, is characterized in that step 1) in form after concretingThe temperature rise value of concrete casting building body on molding temperature basis be no more than 40 DEG C, in concrete casting building body, show the temperature difference and be no more than25 DEG C, and not containing the equivalent temperature of concrete shrinkage; The rate of temperature fall of concrete casting building body is 2.0 DEG C/d; Concrete surface withAtmosphere temperature-difference is no more than 20 DEG C.
7. method of building moulding according to claim 5, is characterized in that step 1) in, concreting enters mouldTime its blanking be highly no more than 2m; In the time building vertical or block structure concrete, concrete discharging opening is from side template inner sideMust not be less than 50mm, same local concrete ulking thickness 30～50cm.
8. according to the method for building moulding described in claim 5 or 6 or 7, characterized by further comprising follow-up maintenanceJourney, concrete steps are as follows:
(1) send special messenger to check concrete surface, as dry in concrete surface, implement immediately artificial water seasoning, maintenanceWater can not directly water on concrete surface, but evenly waters on the wet piece of sack below plastic sheeting, makes the piece of sack abundantMoistening, keep whole concrete surface to be moisture state;
(2) in concreting after 7 days, Side shuttering is removed, then first after concrete surface watering is moistening, immediatelyAdopt plastic sheeting parcel tight, plastic sheeting will be close to concrete surface, not crack, stuffy, and outside hangs up geotechnique againCloth; Within the maintenance time limit, will there is the globule in concrete surface from start to finish; Want the integrality of running check film, if any brokenDamage should be repaired complete in time;
(3) the volute shape inner wall form of volute shape xoncrete structure and support need to be after intensity reaches design strength grade,Could remove, otherwise can only be curing in the mold.
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| CN108249855A (en) * | 2018-01-25 | 2018-07-06 | 四川通德商品混凝土有限公司 | A kind of water-tight concrete mixture and its construction method |
| CN112209681A (en) * | 2020-10-10 | 2021-01-12 | 西安建筑科技大学 | Low-temperature-rise anti-cracking and anti-abrasion concrete and preparation method thereof |
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