A 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 reducing pumping pressure
Active Publication Date: 2021-08-03
CHINA NUCLEAR IND HUAXING CONSTR +1
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Problems solved by technology
[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-shrinkage, low-creep, crack-resistant, high-performance, large-volume concrete for nuclear power plants, which has high strength , small shrinkage and creep, good crack resistance, etc., to solve the crack resistance and long-term volume stability of mass concrete construction
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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 a low-shrinkage, low-creep, anti-crack, high-performance, large-volume concrete, which belongs to the technical field of concrete. A concrete apparent density ≥ 2400kg / m was achieved with the addition of fly ash alone 3 , 28d compressive strength ≥ 70MPa, 28d tensile strength ≥ 4.7MPa requirements, 365d dry shrinkage rate ≤ 519×10 ‑6 , 365d compression creep degree ≤ 28.0×10 ‑6 / MPa, 365d pressure creep coefficient ≤0.72. The remarkable feature of the present invention is that there is no special mixing process for mixing concrete with the concrete mixing ratio, the mixing is simple and convenient, and the order of mixing and feeding can be changed. The concrete mixture has moderate viscosity, good cohesion, low pump pressure during construction, easy to pump and pour, good concrete crack resistance, low shrinkage and creep, good volume stability, and is suitable for high-strength stress complex mass concrete construction Reduce the chance of cracks. Concrete mixed with fly ash can reduce the silo configuration of the mixing station and rationally use the stone powder in the machine-made sand, avoid waste of resources, reduce energy consumption, and greatly reduce costs, which is in line with the green development of concrete. The abstract should not exceed 300 words, so it will be 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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