Low-shrinkage low-creep crack-resistant high-performance mass concrete
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A large-volume concrete, high-performance technology, applied in the field of concrete, can solve the problems of lack of concrete, etc., to achieve the effect of ensuring durability, low temperature rise of heat insulation, and avoiding waste of resources
Active Publication Date: 2019-02-22
CHINA NUCLEAR IND HUAXING CONSTR +1
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[0004] The technical problem to be solved by the present invention is to solve the lack of concrete that meets the requirements of reactor building and raft foundation concrete in the prior art, and use the existing ordinary concrete raw materials to propose low-shrinka
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Embodiment 1
[0034] This embodiment provides a low-shrinkage, low-creep, crack-resistant high-performance mass concrete, and the mass percentages of the various raw material components of the concrete are as follows:
[0036] As a preferred solution, the mass percentages of each raw material component of the low-shrinkage, low-creep, crack-resistant, high-performance mass concrete provided in this example are as follows:
[0038] Wherein, the cement is P.O42.5 ordinary portland cement, heat of hydration 3d≤251kJ / kg, heat of hydration 7d≤293kJ / kg, C 3 A≤7%, C 3 S≤57%, C 2 S≤30%, dry shrinkage <1000μm / m.
[0039] The fly ash mentioned is Class F Class I, which meets the requirements of GB / T1596-2017.
[0040] The water described is drinking ...
Embodiment 2
[0064] This embodiment is except the admixture that uses, and other is identical with embodiment one, difference is described as follows:
[0065] When the performance of the composite high-concentration FDN admixture is adjusted to the same dosage as in Example 1 and the water reducing rate is ≥ 30%, the admixture in Example 1 is replaced with the same mass of the composite high-concentration FDN admixture. The other components and the mixing method were consistent with those in Example 1. The obtained concrete was randomly checked and sampled, and the measurement results under standard curing conditions were tested. The results are shown in Table 9.
[0066] Table 9 concrete sampling test results 2
[0067]
[0068] From the above examples and corresponding data, it can be seen that the concrete mixture of the present invention has moderate viscosity, good cohesion, low pump pressure during construction and is easy to pump and pour, and the concrete has good crack resista...
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Abstract
The invention relates to low-shrinkage low-creep crack-resistant high-performance mass concrete, and belongs to the technical field of concrete. The requirement that the apparent density of the concrete is equal to or more than 2400kg/m<3>, the 28d compressive strength is equal to or more than 70MPa, the 28d tensile strength is equal to or more than 4.7MPa, the 365d dry shrinkage rate is less thanor equal to 519*10<-6>, the 365d compressive creep degree is less than or equal to 28.0*10<->6/MPa and the 365d compression creep coefficient is less than or equal to 0.72 is met under the conditionthat coal ash is mingled singly. The concrete has the advantages of being free of special stirring process, convenient to stir and capable of changing the stirring charging sequence compared with mixed concrete. The concrete mixture has moderate viscosity, good cohesiveness and small pumping pressure during construction, thereby being easy to pump and pour. The concrete has good crack resistance,low shrinkage, low creep, good volume stability, and can reduce the probability of cracks when used in high-strength stress complex mass concrete construction. By means of single mingling of the coalash in the concrete, the silo configuration of a mixing station can be reduced, stone powder in the mechanism sand can be used reasonably to avoid waste of resources, reduce energy consumption, greatly reduce the cost, and conform to environmentally-friendly development of the concrete. The abstract cannot exceed 300 words, thus deleted.
Description
technical field [0001] The invention relates to concrete, in particular to a low-shrinkage, low-creep, anti-crack, high-performance, large-volume concrete, which belongs to the technical field of concrete. Background technique [0002] According to the applicant's knowledge, the concrete used for the raft foundation of the WWER reactor nuclear power plant reactor building is required to be of strength grade B55 and apparent density ≥ 2400kg / m 3 , 28d compressive strength ≥ 70MPa, 28d tensile strength ≥ 4.7MPa, 365d drying shrinkage ≤ 519×10 -6 , 365d pressure creep coefficient ≤0.72, mixture slump (160±30) mm, no segregation bleeding, good cohesion and plasticity. The geometry of the raft foundation is 51.2m in diameter, 3m in thickness, and 2m deep in the middle of the raft foundation, with an area of 452m 2 The irregular pentagonal pit, the top surface of the raft foundation is 90 degrees to 270 degrees, and there are four penetrations of the safety injection system wi...
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