掺合料和引气剂对混凝土孔结构与性能影响的研究

通过压汞法、快速冻融法、美国电量法、干湿循环腐蚀法等试验分析不同类型C30混凝土孔结构与性能的关系.对于C30混凝土,在单掺矿物掺合料情况下,孔隙率降低,小孔增加,对抗氯离子渗透性、抗腐蚀性有利,但对抗冻性的改善不明显;引气剂较大程度增加混凝土闭口孔隙率,对混凝土抗冻性很有利,但毕竟增加了一些开口孔,抗氯离子渗透性、抗腐蚀性有所降低;同时掺这两种物质时,虽增加了混凝土孔隙率,但可以使混凝土的孔径分布相对合理.因此,对混凝土抗冻性、抗氯离子渗透性、抗腐蚀性均有利.单掺矿物掺合料及引气剂混凝土强度有所降低;同时掺这两种物质时,混凝土强度降低不明显.

Study on effects of mineral admixture and air-entraining agent on the pore structure and performance of concrete

Relationships between pore structure and performance are experimentally tested and analyzed for different types of concrete C30,by using mercury intrusion method,rapid frozen thaw method,American coulometric method and dry-wet cycling test method,etc.Results show that mixing mineral admixture reduces the porosity increases the number of small holes and produces favorable effects on resistance to chloride ion permeability and corrosion resistance of concrete,while the effect on frost resistance is not obviou...