大掺量矿物掺合料C25自密实混凝土的配制与应用

　 摘要： （1.厦门市建筑科学研究院集团股份有限公司，福建 厦门 361004；2.厦门天润锦龙建材有限公司，福建 厦门 361024）

　         Abstract：In this paper，C25 self-compacting concrete was made by using large amount of fly ash and limestone powder. Next，the performance of concrete was studied and the concrete was applied to engineering. The results showed that the high performance C25 self-compacting concrete can be made using cementing material which is 450 kg/m3 and mixed with 50% fly ash and limestone powder. Proper amount of fly ash can improve the fluidity of concrete mixture and reduce the drying shrinkage of concrete. Limestone powder can improve the cohesiveness of concrete mixture，but not conducive to the growth of the late strength of concrete，and the drying shrinkage of concrete will increase also. In practical engineering，it is necessary to strengthen the early curing of concrete and prolong the curing time appropriately，and use 60 d compressive strength as the basis of concrete strength evaluation and acceptance.
    Key words：C25 self-compacting concrete，fly ash，limestone powder，engineering application