低水胶比下粉煤灰复合矿粉配制高强泵送混凝土的性能研究

为了探讨低水胶比(0.20)下粉煤灰复合矿粉高性能混凝土的性能,对其力学性能和微观形貌进行了实验分析。结果表明:粉煤灰混凝土早期强度低后期强度高,矿渣微粉混凝土早期强度发展迅速,两者复掺时对混凝土强度的互补较明显;粉煤灰、矿渣单掺和复掺时高性能混凝土拌和物的工作性较好,均满足泵送混凝土对工作性的要求;其颗粒表面活性的Al2O3和SiO2与水泥产生的Ca(OH)2在浆体中发生火山灰反应,生成C-S-H凝胶,细化和减少混凝土界面区域的Ca(OH)2,未水化的颗粒能够填充于混凝土,能够明显地改善混凝土的密实度,降低混凝土的钙硅比。

Study on performance of high strength pumping concrete compounded by fly ash composite powder under low water-cement ratio

In order to investigate the performance of high performance concrete compounded by fly ash composite powder under low water-cement ratio (0.20),the paper discovered through mechanical property and microstructure analysis that the strength of fly ash concrete is low in early period but high in late period.The strength of slag micro powder concrete can rapidly increase in early phase.The strength of concrete is obvious when two complementary complex mixed. The work performance is better and meets the requirements of pumping concrete when fly ash, slag single blending and composite admixture. The Ca(OH)₂ produced by surface-active of SiO₂ and Al₂O₃ of particle and cement can occur volcano ashes reaction and create C-S-H gel that can reduce Ca(OH)₂ in the concrete interface region.pozzolan cement produced in a slurry,Refinement and reduction of concrete.The unhydrated particles can be filled with concrete and significantly improve the density of concrete, reduce calcium silicon ratio of concrete.