用多元胶凝粉体配制高强混凝土的试验研究

在水泥中掺入具有不同颗粒分布和活性的细掺合料可以获得多元胶凝粉体材料。用水化热和抗压强度试验研究了多元胶凝粉体材料的水化进程匹配和复合胶凝效应。用标准稠度用水量法和环境扫描电镜研究了多元粉体体系的紧密堆积效应,提出用标准稠度需水量比作为确定紧密堆积效应的试验方法。进行了多元胶凝粉体混凝土的配合比试验,测定了多元胶凝粉体混凝土的力学性能,变形性能和绝热温升。试验结果表明,改变胶凝组分的品种、含量和细度可以调控多元胶凝粉体的绝热温升和强度发展过程,提高高强混凝土的抗裂性,定制设计高强高性能混凝土。

Experimental Study on Preparing HPC by Multi-component Cementitious Materials

Multi-component cementitious materials can be prepared by incorporating fine blend materials with different size distribution and activity into cement.The hydration process and synergistic effect of the multi-component cementitious were studied by the experiments of hydration heat and compressive strength.The water requirement of normal consistency of paste and ESEM(environmental scanning electron microscope) were used to study the dense-packing effect of the multi-component cementitious powder systems,and the test method of water requirement of normal consistency was proposed to determine the dense-packing effect of this system.The test of mix proportions of multi-component cementitious materials is carried out,and the mechanical property,deformation property,adiabatic temperature of concrete made of multi-component cementitious materials.The result shows that the hydration-exothermic process,the strength developement and the crack resistance of high performance concrete could be regulated by varying the type the content or the fineness of each component of the multi-component cementitious powder system.