掺合料及引气剂对混凝土性能的影响研究

Effects of admixtures and air entraining agent on performance of concrete

系统地研究了硅粉、矿渣粉、粉煤灰等掺合料及引气剂对混凝土力学性能、抗冻性能及抗氯离子渗透性能的影响。研究结果表明:混凝土中适当引气可以改善混凝土的耐久性能,但随着含气量的增加混凝土强度呈递减趋势;掺合料可改善混凝土的物理力学性能、抗冻性能及抗氯离子渗透性能;掺合料与引气剂搭配,可发挥材料的叠加效应,使混凝土的力学性能和综合耐久性提高,是高寒地区混凝土配制的较佳途径。

The effects of admixtures and air entraining agent on mechanical property,frost resistance and resistance to chloride-ion penetration of concrete are investigated.The results show that,proper air content can improve the durability of concrete,but concrete strength decreases with increasing air content;Admixtures,including silica fume,slag and fly-ash,can improve the mechanical property,frost resistance and resistance to chloride-ion penetration;Combining admixtures with air entraining agent,the cumulative effect of materials is generated to improve the mechanical property and durability of concrete,which is a better way to be adopted in severe cold district.