磷渣粉石灰石粉复合掺合料及其混凝土的性能试验

Performance test of phosphorus slag powder and limestone powder compound mineral additive and the compounded concrete

为了研究磷渣粉、石灰石粉复合掺合料(PL掺合料)替代粉煤灰的可行性,测试了磷渣粉和石灰石粉、Ⅱ级粉煤灰等材料的基本性能,对比分析了其水泥浆体的微观形貌,测试了不同掺合料大坝混凝土的力学、耐久、变形性能。通过PL掺合料混凝土与粉煤灰混凝土的性能对比试验,结果表明PL掺合料在微观结构和宏观性能方面综合优于Ⅱ级粉煤灰,尤其是其长龄期的抗压强度、极限拉伸值等性能;PL掺合料成本低廉,具有较高的技术经济效益和社会效益,在缺乏优质粉煤灰的西南地区,可以替代粉煤灰作为大坝混凝土的掺合料。

In order to study the feasibility of the compound mineral additives composed of phosphorus slag powder and limestone powder（ PL） for substituting fly ash（ FA） , basic characteristics of phosphorus slag powder（ P） , limestone powder （ L） and FA were tested. Additionally, the micro structures of their cement paste were analyzed comparatively, and the performance of mechanical, durability, deformation of dam concrete with different mineral additives were tested. According to the comparison of characteristics of PL concrete and FA concrete, it is concluded that the performance of PL concrete is better than that of FA concrete on micro and macro scales, especially on the long-term compressive strength, and ultimate tensile strain scale. Besides, the PL mineral additive has lower cost as well as higher technical and social benefits. Thus, in Southwest China, where it is lacking high-quality FA, the substitution of PL additive for FA as mineral additive used in dam concrete is feasible alternative.