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1. Control the quality of concrete raw materials
The quality of concrete raw materials has a significant impact on the performance of concrete, and the performance of the raw materials used in the preparation of shrinkage crack resistant concrete must meet the quality requirements of its relevant standards. Therefore, high-quality active admixtures can be selected, using a dual blend of fly ash and mineral powder; The quality of aggregates has a significant impact on the crack resistance of concrete. The mud content and mud block content should be controlled, and well graded medium coarse sand and continuously graded stones with low porosity should be selected; Choose high-performance water reducing agents with high water reduction rate and low shrinkage ratio.
2. Optimize concrete mix proportion parameters
The parameters of concrete mix proportion have a significant impact on the crack resistance of concrete. Therefore, in order to improve the volume stability of concrete, the mix proportion design rules of crack resistant concrete should be followed in concrete mix proportion design: low cement dosage, low water consumption, appropriate water cement ratio, maximum aggregate packing density, as well as the dual addition of active admixtures and high-efficiency water reducing agents. While ensuring compliance with design and construction requirements for workability, efforts should be made to increase the content of coarse aggregates in concrete, reduce sand content and slurry content, while controlling the fluidity and uniformity of the concrete.
3. Other measures to optimize concrete crack resistance
To solve the problem of concrete cracking, the crack resistance performance of concrete can be improved by adding auxiliary crack resistant materials; Surface wet curing can also be applied to large-area concrete; Take insulation or cooling measures for large volume concrete after demoulding; Avoid carrying out on-site construction in rainy, snowy, and windy weather; For underground continuous wall structures, implement backfilling measures.
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