As the amount of limestone powder replaced by fly ash increases, the 7d compressive strength of concrete will increase to a certain extent, and the larger the amount, the more obvious the improvement. When limestone powder completely replaces fly ash, the 7d strength is higher than the benchmark concrete 4.5MPa, the strength increased by 15.0%. This may be due to the fact that the particles of limestone powder are very fine and become glass beads, which have a very good filling effect and improve the compactness of concrete. When the limestone powder replaces 33% fly ash, the 28d strength of concrete is reduced by 6.2MPa compared with the benchmark concrete, which is the most obvious reduction. When the replacement amount of limestone powder is 67% and 100%, compared with the replacement amount of 33%, the 28d strength is slightly improved, but both are lower than the benchmark concrete. It can be seen that after limestone powder replaces fly ash, the 7d compressive strength of high-performance concrete is improved to a certain extent, but it is not good for the later strength.
(1) After replacing fly ash with limestone powder and other qualities, the specific surface area of limestone powder increases, the initial slump and 1h slump value of the high-performance coagulation mixture are increased, and the 1h slump loss over time is reduced. The strength values of concrete 7d and 28d increase with the increase of the specific surface area of limestone powder.
(2) After limestone powder replaces fly ash, with the increase of the replacement amount, the initial slump and 1h slump value of the high-performance coagulation mixture increase, and the 1h slump loss over time is reduced. After replacing fly ash with limestone powder, the 7d compressive strength will be improved to a certain extent, but the 28d strength will be reduced, especially when the content is 33%.
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