复合纳米材料对混凝土及水泥砂浆的性能影响

Performance Influence of Composite Nano-materials on Concrete and Cement Mortar

研究了加入不同比例复合纳米材料和掺30～40％四掺复合掺合料的胶砂和C40级混凝土的性能。对复配的C40级混凝土试块进行了氯离子和硫酸盐侵蚀试验、对复配净浆试块进行了扫描电镜（SEM）和差示扫描量热（DSC）测试。并讨论了复合纳米材料在混凝土中的不同加入方式。结果表明：相对于基准C40级混凝土。掺入复合掺合料和复合纳米材料配制的C40级混凝土的流动性和抗硫酸盐、氯离子侵蚀的能力均有所增强，其抗压强度提高约20％；复合纳米材料掺入减水剂用于混凝土的效果优于掺入复合掺合料用于混凝土。复合纳米材料掺入减水剂中可以很好地解决纳米材料易于团聚的问题，确定了复合纳米材料的掺入方式是将复合纳米材料掺入减水剂中，掺入量为减水剂质量的0．5-1．0％．

The performance of cement mortar and C40 grade concrete, into which different proportion of composite nano-materials and 30%-40% of composite admixtures were mixed, was studied. The sulphate and chloride ions corrosion tests were used for C40 grade concrete ,the SEM and DSC tests were used for paste hydration products,and the problem about how to add composite nano-materials into cement was discussed . The results show that the composite nano-materials and composite admixtures can increase the fluidity, sulphate and chloride ions resistance and compressive strength of C40 grade concrete , the weight of mixed composite nano-materials which were added into water reducing agents is 0.5-1.0% of water reducing agents＇ weight.