The mass ratio of each component in reactive powder concrete (RPC) composite materials with five kinds of particle gradation is optimized by dense packing technology. Effects of water/binder ratio (W/B) and steel fiber content on RPC compressive strength are investigated. And the microstructure of products is measured by SEM. Results show that the RPC with good workability, extremely dense of product structure and up to 179.6MPa compressive strength could be pre-pared in normal curing condition when the optimized composite materials is used. The compressive strength of RPC in-creases with the W/B decreasing. The ultrahigh strength RPC with good workability can be obtained even when the W/B decreases to 0.15. And the compressive strength of RPC increases with the volume content of steel fiber increasing in the same W/B. In order to ensure the workability of RPC, the volume content of steel fiber should not exceed 2%.%采用紧密填充技术优化出了活性粉末混凝土五级配复合材料体系中各组分的搭配比例，探讨了水胶比及钢纤维掺量等对活性粉末混凝土抗压强度的影响，并通过SEM分析了活性粉末混凝土产物的微观结构。结果表明，选用优化后的复合材料体系，在常温养护条件下可制备工作性能良好、产物结构致密、28d抗压强度高达179.6MPa的活性粉末混凝土。活性粉末混凝土的抗压强度随水胶比的降低而增加，当水胶比降低至0.15时，仍可获得工作性能良好的超高强活性粉末混凝土；在同一水胶比下，增加钢纤维掺量能显著提高活性粉末混凝土的抗压强度，但为了保证混凝土的工作性能，钢纤维的体积掺量不宜超过2%。
展开▼
