摘要
在水泥混凝土中加入膨胀剂将改变水化产物的数量和孔结构,进而影响其抗碳化性能。对掺膨胀剂水泥混凝土的显微结构及抗碳化性能进行了研究,分析了膨胀剂用量和碳化过程对混凝土中Ca(OH)2含量和孔结构特性的改变规律。研究结果表明:膨胀剂虽然增加了混凝土内Ca(OH)2的数量,但同时劣化了混凝土内部的孔结构,使CO2更易向混凝土内部渗透,从而加速了混凝土的碳化。
The addition of expansive admixture in concrete can change both the density and alkalinity, thereby affect the carbonation resistance. Expansive admixture is used in this article,which studied how different additions of expansive admixture influence the carbonation rate of concrete.The mechanism was discussed from two aspects including alkali reserve and pore structure.The results showed that expansive admixture could both increase the alkali reserve and coarsen the structure of concrete, then accelerated the diffusion rate of C02 ultimately.
出处
《混凝土》
CAS
CSCD
北大核心
2011年第7期62-64,68,共4页
Concrete
基金
国家自然科学基金(50802067)
中央高校基础研究基金(2010-VI-011)
教育部回国留学人员基金
关键词
膨胀剂
碳化速率
碱含量
孔结构
expansive admixture
carbonation rate
alkali reserve
pore structure
