CN103723968A - Concrete for volute casing pump structure of nuclear power plant PX pump room and pouring forming method of concrete - Google Patents
Concrete for volute casing pump structure of nuclear power plant PX pump room and pouring forming method of concrete Download PDFInfo
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- CN103723968A CN103723968A CN201310740293.2A CN201310740293A CN103723968A CN 103723968 A CN103723968 A CN 103723968A CN 201310740293 A CN201310740293 A CN 201310740293A CN 103723968 A CN103723968 A CN 103723968A
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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 invention relates to concrete for volute casing pump structure of nuclear power plant PX pump room. The concrete in every cubic meter comprises 261-296kg of P.II cement, 27-40kg of silica fume, 88-110kg of coal ash, 35-44kg of a sulfoaluminate expanding agent, 0.9kg of polypropylene fiber, 12kg of composite amino alcohol corrosion inhibiting admixtures, 6.63-8.62kg of polycarboxylate superplasticizer, 1068-1095kg of coarse aggregate, 644-676kg of fine aggregate and 166kg of water. The invention also relates to a pouring forming method by adopting the concrete for volute casing pump structure of the nuclear power plant PX pump room. The concrete for volute casing pump structure of the nuclear power plant PX pump room has excellent crack resistance and high durability, the concrete structure can be prevented from being damaged by seawater corrosion in the nuclear power plant operating period, and the safe and reliable operation of the nuclear power plant in the lifetime is guaranteed.
Description
Technical field
The present invention relates to building material field, especially there is the used in nuclear power station volute pump concrete of high permeability resistant, high resistance chemical corrosion, high cracking resistance 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 plan six million kilowatt nuclear power units, adopt rely on M310 heap type improved domestic two generation half nuclear power generating sets, current 1～4 unit is built successively.In the underground engineering structure concrete of conventional island steam turbine factory building and PX pump house, used in a large number polypropylene fibre compensate for shrinkage water-proof concrete, strength grade of concrete does not wait (take 60 days ultimate compression strength as standard for acceptance) from C35～C45.Wherein PX pump house volute pump concrete structure is very complicated abnormally-structured of shape, and structural volume is thick large, structural base and internal-wall concrete construction are watered and are smash very difficulty, engineering design work-ing life is 50 years, belong to not maintainable permanent concrete structure in the Nuclear power plants operation life phase, directly related with Nuclear safety.Its residing Working environment is immersed among seawater all the year round, internal-wall concrete structure will stand washing away and corroding of seawater year in year out, if there is crack or other defect in concrete structure, will cause inner reinforcing bar to be subject to the corrosion of seawater, and then damage monolithic concrete structure, have influence on the safe operation of nuclear power generating sets.Therefore; require mixing concrete thing to there is excellent serviceability; concrete structure after building has good cracking resistance, anti-permeability performance; do not allow to produce harmful cracks; and can bear flowing seawater year in year out wash away abrasion; guarantee that reinforcement in concrete is not corroded, realize the high-durability of concrete structure engineering.And the Nuclear power plants PX pump house volute pump concrete structure that application existing concrete formula is built, be subject to the restriction of Code for design of concrete structures and associated minerals adulterant operating specification at that time, ultimate compression strength, water resistant penetrating quality, splitting resistance of building the PX pump house volute pump structure of formation etc. is all not ideal.
Summary of the invention
The object of the present invention is to provide a kind of Nuclear power plants PX pump house volute pump structure concrete, it has overcome deficiency of the prior art, has high chloride ion impermeability, high resistance chemical corrosion, high cracking resistance, its good fluidity.
A kind of Nuclear power plants PX pump house volute pump structure concrete, the concrete of every cubic metre consists of: PII cement 261～296kg, silicon ash 27～40kg, flyash 88～110kg, sulplo-aluminate 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 the low alkali cement that alkali content is less than 0.6%, the C in cement
3a content is less than 5%, C
3s content is less than 55%, and must not admixture kiln ash in described cement;
Amorphous Si O in described silicon ash
2content account for 90% of total mass;
Described flyash is F class I level;
The molecular-weight average 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 (fineness modulus is 2.6 ± 0.2).
The present invention does not have special requirement to sulplo-aluminate class swelling agent, as long as such swelling agent all can, preferred, described sulplo-aluminate class swelling agent is HEA type swelling agent.Sulplo-aluminate class swelling agent is anti-crack water-proof agent, mainly by C
3a3CaSO
432H
2o and Ca (OH)
2two kinds of expansion sources are composited, after the initial sclerosis of concrete, intensity is in the rapid growth phase, concrete can produce string stress, and the expansion energy that anti-crack water-proof agent produces, in concrete structure, set up appropriate compressive pre-stress, can the concrete string stress of effective compensation, reduce and suppress the shrinkage crack after concrete hardening.
The length of described polypropylene fibre is 19mm ± 2mm, and nominal diameter is 31.5 μ m; Density: 0.91g/cm
3.Above-mentioned polypropylene fibre plays action of crack arrest to the concrete in the plastic stage, is mainly to reach resistance and split effect by reducing and suppressing concrete plastic set crack and plastic shrinkage cracks.
The model that described silicon ash is provided by Shanghai Tian Kai silica flour Materials Co., Ltd is TOPKEN900D, and the average grain particle diameter of silicon ash is 0.1 μ m, only for cement granules more than one percent, surface-area is approximately 15000m
2/ kg, has two kinds of advantages of volcanic ash effect and effect of particle size, can significantly improve bleeding and the cohesiveness of fresh concrete, has improved the cohesive strength of cement slurry and aggregate, thereby concrete wear resistance is also improved.
Nuclear power plants PX pump house volute pump structure of the present invention is mixing by low alkali cement and silicon ash, flyash, swelling agent altogether with concrete; give full play to the super synergistic effect of gelling material; admixture New Building Materials polypropylene fibre and compounded amino alcohols reinforcing steel bar corrosion inhibitor simultaneously; jointly realize the protection to Steel Bars in Concrete Structure; guarantee the high-durability of concrete structure, especially high chloride ion impermeability.
Described flyash is F class I level, can significantly reduce concrete water consumption, increases concrete mobility.With silicon ash mix altogether can fine performance filling effect and pozzolanic reaction make 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 steel bar corrosion inhibitor of this kind all can be used.Compounded amino alcohols reinforcing steel bar corrosion inhibitor is composited through rational Match by dispersed component, resistance rust component, antiseptic ingredient and other function ingredients, is light green transparent liquid.Its resistance rust mechanism can be summarized as: when rust inhibitor molecule arrives rebar surface, progressively form the stable unit molecule of one deck or multimolecular film, general this tunic molecule is approximately perpendicular to metallic surface and is arranged in parallel, hydrophilic radical is combined with reinforcing bar, and hydrophobic group forms hydrophobic barrier isolates moisture and chlorion etc. with reinforcing bar.
The present invention does not have special requirement to polycarboxylate dehydragent, can be used for concrete water reducer and all can use as long as this kind.Polycarboxylate dehydragent is the polymkeric substance with sulfonic group, carboxylic acid group, ehter bond, is light yellow 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, increases the concrete water consumption of folk prescription.By being combined with of polycarboxylate dehydragent, can be when reducing the folk prescription the reinforcement of concrete water yield, 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 grout interface, reduces or eliminates inside concrete micro crack.
Water can be to meet the tap water that existing national standard < < drinking water sanitary standard > > GB5749 requires.
In concrete, mix flyash and the silicon ash of quality of the present invention, be conducive to the improvement of resistance to cleavage, especially mixing of appropriate flyash and anti-crack water-proof agent, can to a certain degree reduce concrete self-constriction, mix altogether both can bring into play with silicon ash and mix that silicon ash concrete charge pass significantly reduces and the easily advantage of assurance of early strength, can suppress again to mix silicon ash and more easily occur the effect of early stage desciccation crack.In addition, mixing of building material " polypropylene fibre ", can reduce and suppress sedimentation or the shrinkage crack of concrete plastic stage, reduces the capillary pore rate of concrete structure inside, and the crack that simultaneously effectively suppresses volute pump concrete inner wall surface produces.
The method that adopts above-mentioned Nuclear power plants PX pump house volute pump structure concrete placement moulding, comprises the steps:
1) take after each component each component is mixed, stir, be poured into mould, concrete molding temperature should be less than 30 ℃, and concrete enters the temperature of mould front template and reinforcing bar and near local temperature all should not exceed 40 ℃;
During cast, concrete is taked overall layering or passes formula 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, and pointwise is moved, and 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 steam circle, should insert lower one deck 5～10cm while vibrating last layer, so that two layer concretes are in conjunction with firm; Vibrating spear must not touch reinforcing bar and template, and or else heavy to concrete when vibrating, without significantly bubble rising, pellicular water mud appears in concrete surface, when surface reaches smooth, has vibrated;
2) concrete vibrating completed after 3～5 hours, concrete surface is smeared to pressure again, and at concrete surface, cover wet hessian cloth immediately after concrete final set, then covered with plastic film, above plastics film, cover dry hessian cloth or colour bar cloth, regularly water spray remains that concrete surface is in moisture state again.
The temperature rise value of the concrete casting building body forming after concrete placement in step 1) on molding temperature basis should not exceed 40 ℃, shows the temperature difference and is no more than 25 ℃, and do not contain the equivalent temperature of concrete shrinkage in concrete casting building body; The rate of temperature fall of concrete casting building body is 2.0 ℃/d; Concrete surface and atmosphere temperature-difference are no more than 20 ℃.
In step 1), when concrete casting injects mould, its blanking highly should not exceed 2m; When building vertical or lumphy structure concrete, concrete discharge port must not be less than 50mm from side template inner side, and same local concrete ulking thickness does not exceed 30～50cm.
In step 1), when high temperature season casting concrete, the mode of taking to mix chilled water or ice bits reduces concrete molding temperature as far as possible, avoids 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, covered with plastic film in time after concrete formation, to stop scattering and disappearing of the moisture content that is evaporated in concrete, allows it again change into that liquid water returns 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 artificial water seasoning, curing water can not directly water on concrete surface, but evenly water on the wet hessian cloth below plastics film, make hessian cloth fully moistening, keep whole concrete surface to be moisture state;
(2) in concrete placement after 7 days, Side shuttering is removed, and then first after concrete surface watering is moistening, adopts immediately plastics film parcel tight, and plastics film will be close to concrete surface, not crack, stuffy, and outside hangs up geotextile again; Within the maintenance time limit, will there is the globule in concrete surface all along; Want the integrity of running check film, if any breakage, should repair in time complete;
(3) the volute shape inner wall form of volute shape concrete structure and support need to, after intensity reaches design strength grade, could be removed, 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, and during temperature measuring head Transducers Embedded in Concrete, just monitors, and every 2h surveys once.3-4d after concrete placement, every 4h surveys once, and the every 8h of 5-7d surveys once, analyzes in time the temperature measurement data of every day, draws temperature-time curve, cancels insulation after each position temperature difference enters safety range.The thermometric time limit should comprise that concrete internal temperature, from intensification, high temperature, lower the temperature, level off to envrionment temperature and dismounting insulation, enters the whole process of safety range, in thermometric time principle, continues 14d, answers if desired the proper extension thermometric time.
In step (3), strong concrete when concrete striking time not only will be considered form removal 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 lower the temperature too fast during concrete contact air, ftractures, and more can not water at this moment cold water maintenance.Inside concrete started before cooling and concrete internal temperature must not form removal when the highest, should not form removal when showing the temperature difference in structure or concrete members and being greater than 25 ℃, concrete surface and being greater than 20 ℃ with atmosphere temperature-difference.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 plants PX pump house volute pump structure of the present invention is utilized industrial waste with concrete rationally, when realizing energy-saving and emission-reduction, has obtained single-material and has mixed the beneficial functions that cannot produce, and has obtained the concrete with excellent resistance to cleavage; And have high-durability, can guarantee Nuclear power plants run duration, its concrete structure can be because sea-water corrosion destroys, and then guarantee the safe and reliable operation in Nuclear power plants lifetime.
Embodiment
Below in conjunction with specific embodiment, further illustrate the present invention.
" the HEA type swelling agent " using in embodiment for Jiangxi Wuguan New Material Co., Ltd. produce model be WG-HEA type anti-crack water-proof agent.
The model that " the compounded amino alcohols reinforcing steel bar corrosion inhibitor " using in embodiment blocks the production of (China) company limited for west is Sika Ferro Gard901.
" 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/cm
3.
" the PII cement " that in embodiment, uses is the low alkali cement that alkali content is less than 0.6%, the C in cement
3a content is less than 5%, C
3s content is less than 55%, and must not admixture kiln ash in described cement.
Table 1 is each component and the content thereof in concrete for Nuclear power plants PX pump house volute pump structure of every cubic metre in each embodiment.
Table 1
Adopt 2m
3planetary twin-shaft mixer group fully stirs mixed each component, except polypropylene fibre is pressed folk prescription consumption quantitative package (composition of water soluble package is consistent with polypropylene), outside employing manual type feeds intake, other starting material all adopt automatic gauge, automatic charging mode to add in stirrer and stir, the concrete-agitating time is 75 seconds, after being transported to again job location, concrete placement is entered to mould, concrete molding temperature should be less than 30 ℃, and concrete enters the temperature of mould front template and reinforcing bar and near local temperature all should not exceed 40 ℃; The temperature rise value of the concrete casting building body forming after concrete placement on molding temperature basis should not exceed 40 ℃, shows the temperature difference and is no more than 25 ℃, and do not contain the equivalent temperature of concrete shrinkage in concrete casting building body; The rate of temperature fall of concrete casting building body is 2.0 ℃/d; Concrete surface and atmosphere temperature-difference are no more than 20 ℃.When high temperature season casting concrete, the mode of taking to mix chilled water or ice bits reduces concrete molding temperature as far as possible, avoids template and the concrete of newly building is directly exposed to sunlight as far as possible.
When concrete casting injects mould, its blanking highly should not exceed 2m; When building vertical or lumphy structure concrete, concrete discharge port must not be less than 50mm from side template inner side, and same local concrete ulking thickness does not exceed 30～50cm.During cast, concrete is taked overall layering or passes formula 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.Maximum duration intermittently should be determined by cement type used, temperature and concrete coagulation condition, and must not be greater than the concrete presetting period.
Adopt internal vibration rod to concrete vibrating, internal vibration rod should be inserted and pull out slowly soon, and slotting point is evenly distributed, and pointwise is moved, and 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 steam circle, is generally 30～40cm, should insert lower one deck 5～10cm while vibrating last layer, so that two layer concretes are in conjunction with firm; Vibrating spear must not touch reinforcing bar and template, and or else heavy to concrete when vibrating, without significantly bubble rising, pellicular water mud appears in concrete surface, when surface reaches smooth, has vibrated.
Concrete vibrating completed after 3～5 hours, concrete surface is smeared to pressure again, and at concrete surface, cover wet hessian cloth immediately after concrete final set, then covered with plastic film, above plastics film, cover dry hessian cloth or colour bar cloth, regularly water spray remains that concrete surface is in moisture state again; When construction environment relative humidity is less, wind speed is when larger, covered with plastic film in time after concrete formation, to stop scattering and disappearing of the moisture content that is evaporated in concrete, allows it again change into that liquid water returns and moistening concrete surface.
Above-mentioned building after the concrete depositing of volute shape completes, will carry out the maintenance in later stage, send special messenger to check concrete surface, as dry in concrete surface, implement immediately artificial water seasoning, curing water can not directly water on concrete surface, but evenly waters on the wet hessian cloth below plastics film, make hessian cloth fully moistening, keep whole concrete surface to be moisture state.The frequency of water seasoning should be determined in conjunction with concrete measuring temperature situation, and concrete temperature is erected from watering, and during temperature measuring head Transducers Embedded in Concrete, just monitors, and every 2h surveys once.3-4d after concrete placement, every 4h surveys once, and the every 8h of 5-7d surveys once, analyzes in time the temperature measurement data of every day, draws temperature-time curve, cancels insulation after each position temperature difference enters safety range.The thermometric time limit should comprise that concrete internal temperature, from intensification, high temperature, lower the temperature, level off to envrionment temperature and dismounting insulation, enters the whole process of safety range, in thermometric time principle, continues 14d, answers if desired the proper extension thermometric time.
In concrete placement, after 7 days, Side shuttering is removed, then first after concrete surface watering is moistening, adopts immediately plastics film parcel tight, and plastics film will be close to concrete surface, not crack, stuffy, and outside hangs up geotextile again; Within the maintenance time limit, will there is the globule in concrete surface all along; Want the integrity of running check film, if any breakage, should repair in time complete.The volute shape inner wall form of volute shape concrete structure and support need to, after intensity reaches design strength grade, could be removed, otherwise can only be curing in the mold, do not take other measure.Strong concrete when the volute shape inner wall form of volute shape concrete structure and the striking time of support not only will be considered form removal is outside one's consideration, concrete temperature while also should be taken into account form removal can not be too high, in order to avoid lower the temperature too fast during concrete contact air, ftracture, more can not water at this moment cold water maintenance.Inside concrete started before cooling and concrete internal temperature must not form removal when the highest, should not form removal when showing the temperature difference in structure or concrete members and being greater than 25 ℃, concrete surface and being greater than 20 ℃ with atmosphere temperature-difference.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.
In concrete structure maintenance, finish, after template complete removal, concrete surface and sidewall are not all found naked eyes visible crack, just on volute shape internal-wall concrete part top layer, exist loose, on part surface, occurred a small amount of microscopic checks (volute shape internal-wall concrete texture quality is most critical Essentials for quality control), fracture width is all less than 0.2mm after testing, degree of depth deficiency 5mm, be harmless shallow table crack, design side is satisfied with overall volute pump concrete structure quality very much.
Analyze causes of cracks, be mainly with volute shape inner wall form and support and need to after intensity reaches design strength grade, could remove, cannot take to be incubated, moist keeping measures is relevant; And the entrance of volute shape structure inner chamber does not block, and extraneous wind-force is blown into along entrance, has formed convolution at inner chamber, accelerated the dry dehydration on internal-wall concrete surface.
Top layer loose, is because inside configuration reinforcing bar is intensive, and structural shape complexity, causes concrete the vibrating in inwall place not fully to cause.
For the long-term safety of guaranteeing concrete structure, use, adopt water blast gun to remove surperficial tectorium, and adopt epoxy resin pressure grouting to repair, sealed all cracks
In whole volute pump concrete pouring construction process, concrete has represented good workability, although pumping line pipeline reaches more than 200 meter, the drop of pumping also has more than 30 meters, and casting process is very smooth.Obtain the performance perameter of volute shape concrete casting injection body in Table 2:
Table 2
Claims (8)
1. a Nuclear power plants PX pump house volute pump structure concrete, is characterized in that the concrete of every cubic metre consists of:
P
cement 261 ~ 296kg, silicon ash 27 ~ 40 kg, flyash 88 ~ 110kg, sulplo-aluminate class swelling agent 35 ~ 44 kg, polypropylene fibre 0.9kg, compounded amino alcohols reinforcing steel bar corrosion inhibitor 12kg, polycarboxylate dehydragent 6.63-8.62 kg, coarse aggregate 1068 ~ 1095 kg, fine aggregate 644 ~ 676 kg, water 166kg;
Described P
cement is the low alkali cement that alkali content is less than 0.6%, the C in cement
3a content is less than 5%,, C
3s content is less than 55%, and must not admixture kiln ash in described cement;
Amorphous Si O in described silicon ash
2content account for 90% of total mass;
Described flyash is F class
level;
The molecular-weight average of described polypropylene fibre is 180000～300000;
The ballast grain sizes of described coarse aggregate is 5～25mm;
Described fine aggregate belongs to
district's medium sand (fineness modulus is 2.6 ± 0.2).
2. Nuclear power plants PX pump house volute pump structure concrete according to claim 1, is characterized in that described sulplo-aluminate class swelling agent is HEA type swelling agent.
3. Nuclear power plants PX pump house volute pump structure concrete according to claim 1 and 2, the length that it is characterized in that described polypropylene fibre is 19mm ± 2mm, nominal diameter is 31.5 μ m.
4. Nuclear power plants PX pump house volute pump structure concrete according to claim 3, is characterized in that the model that described silicon ash is provided by Shanghai Tian Kai silica flour Materials Co., Ltd is
tOPKEN900D.
5. the method for concrete placement moulding for the Nuclear power plants PX pump house volute pump structure described in the above-mentioned arbitrary claim of employing, is characterized in that comprising the steps:
1) take after each component each component is mixed, stir, be poured into mould, concrete molding temperature should be less than 30 ℃, and concrete enters the temperature of mould front template and reinforcing bar and near local temperature all should not exceed 40 ℃;
During cast, concrete is taked overall layering or passes formula 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, and pointwise is moved, and 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 steam circle, should insert lower one deck 5～10cm while vibrating last layer, so that two layer concretes are in conjunction with firm; Vibrating spear must not touch reinforcing bar and template, and or else heavy to concrete when vibrating, without significantly bubble rising, pellicular water mud appears in concrete surface, when surface reaches smooth, has vibrated;
2) concrete vibrating completed after 3～5 hours, concrete surface is smeared to pressure again, and at concrete surface, cover wet hessian cloth immediately after concrete final set, then covered with plastic film, above plastics film, cover dry hessian cloth or colour bar cloth, regularly water spray remains that concrete surface is in moisture state again.
6. method of building moulding according to claim 5, it is characterized in that the concrete casting building body that forms after concrete placement in the step 1) temperature rise value on molding temperature basis should not exceed 40 ℃, in concrete casting building body, show the temperature difference and be no more than 25 ℃, and do not contain the equivalent temperature of concrete shrinkage; The rate of temperature fall of concrete casting building body is 2.0 ℃/d; Concrete surface and atmosphere temperature-difference are no more than 20 ℃.
7. method of building moulding according to claim 5, is characterized in that in step 1), and when concrete casting injects mould, its blanking highly should not exceed 2m; When building vertical or lumphy structure concrete, concrete discharge port must not be less than 50mm from side template inner side, and same local concrete ulking thickness does not exceed 30～50cm.
8. according to the method for building moulding described in claim 5 or 6 or 7, characterized by further comprising follow-up maintenance processes, concrete steps are as follows
(1) send special messenger to check concrete surface, as dry in concrete surface, implement immediately artificial water seasoning, curing water can not directly water on concrete surface, but evenly water on the wet hessian cloth below plastics film, make hessian cloth fully moistening, keep whole concrete surface to be moisture state;
(2) in concrete placement after 7 days, Side shuttering is removed, and then first after concrete surface watering is moistening, adopts immediately plastics film parcel tight, and plastics film will be close to concrete surface, not crack, stuffy, and outside hangs up geotextile again; Within the maintenance time limit, will there is the globule in concrete surface all along; Want the integrity of running check film, if any breakage, should repair in time complete;
(3) the volute shape inner wall form of volute shape concrete structure and support need to, after intensity reaches design strength grade, could be removed, otherwise can only be curing in the mold.
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| CN107857530A (en) * | 2017-10-13 | 2018-03-30 | 西南交通大学 | A kind of Bridge Pier resistance to erosion, anti-corrosion concrete material and preparation method |
| CN107572982A (en) * | 2017-10-18 | 2018-01-12 | 北京建工路桥工程建设有限责任公司 | A kind of ultra-long concrete mixture and its construction method for pouring wall |
| CN107673713A (en) * | 2017-10-18 | 2018-02-09 | 北京建工路桥工程建设有限责任公司 | A kind of mass concrete mixture and its construction method for pouring wall |
| CN107673713B (en) * | 2017-10-18 | 2020-07-14 | 北京建工路桥集团有限公司 | Large-volume concrete mixture and construction method for pouring wall by using same |
| 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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