环保高性能水泥在高含泥量集料中的试验研究及应用

Experimental Study and Application of Environmental Protection High Performance Cement in High Mud Content Aggregates

在普通硅酸盐水泥中加入单纯度的硅、铝基团添加剂,通过红外光谱分析发现所制得的高性能水泥硅、铝基团显著增加,对水化胶凝起到促进作用,并且水泥胶砂强度增加约10%。同时,普通硅酸盐水泥和高性能水泥分别与高含泥量(17.6%)集料混凝土的抗压、抗折和抗冻融试验中,高性能水泥均表现出良好的胶凝性能,可达到设计强度标准,且抗冻性试验次数是普通水泥混凝土的1.5倍。最后,利用电镜扫描分析了高性能水泥水化机理,可将泥土颗粒形成稳定的网络骨架胶凝结构,降低含泥量对混凝土强度及其他性能的影响,增加工程材料选用范围,减少人为对砂石料的开采和中间运输环节,做到就地取材利用和环境保护。

Active silicate and aluminate additives were added into Portland cement,which could be detected by FT-IR from significantly increased Al-O and Si-O bonding. Those component could promote hydration process,and strengthened cement mortar about 10%. At same time,ordinary Portland cement and high performance cement were mixed with aggregate with high mud content（ 17. 6%） separately to compare the compressive strength,bending strength and freeze-thaw resistance of concrete. High performance concrete showed good gelatinization performance,which could meet the standard strength design,and freeze-thaw resistance ability was 1. 5 times higher than that of ordinary cement concrete. Finally,by using scanning electron microscope analysis,high performance cement hydration mechanism with soil particles could be observed that a stable network skeleton gel structure was formed,which reduced the mud content influence on concrete strength and other performance,and enlarge the scope of engineering material selection,saved transportation cost and reduced the effect of environment impact from exploration and mining by using local raw materials.