高效减水剂对混凝土碳化性能影响的机理研究

采用碳化试验,系统测试了未掺高效减水剂空白组(C)、掺入萘系高效减水剂(N)及掺入聚羧酸系高效减水剂(J)的水泥胶砂试件的碳化深度,并用X射线衍射分析了高效减水剂影响水泥抗碳化能力的微观机理。结果表明:掺高效减水剂的混凝土早期的碳化深度值增大较慢,后期增大相对较快,其碳化深度均可用幂函数d=atb表示,掺入高效减水剂可以降低Ca(OH)2的含量,从而提高水泥的早期抗碳化能力。并且聚羧酸系高效减水剂可促使水泥水化充分。

Influence mechanism of the carbonation resistance with superplasticizer

The carbonization experiment was adopted to study mortar capacity of carbonation resistance with different chemical admixture of naphthalene based superplasticizer(N)and poly-acrylic based superplasticizer(J),the mortar without chemical admixture was marked(C).The X-ray diffraction was adopted to analyse the microscopic mechanism of the superplasticizer on mortar capacity of carbonation resistance.The re sults showed that the early carbonation depth of the mortar(J)and(N)increased slower and the latter carb...