掺复合掺合料混凝土抗硫酸盐侵蚀性能研究

Study on Sulfate Resistance of Concrete with Compound Mineral Admixture

研究了钢渣-矿渣-粉煤灰复合掺合料的混凝土在硫酸盐及干湿交替硫酸盐环境中的强度、膨胀率及剥落量。结果表明:在干湿循环环境中,硫酸盐结晶引起的破坏远大于化学侵蚀引起的破坏。复合掺合料能有效抑制硫酸盐化学侵蚀引起的膨胀破坏,但掺加复合掺合料的混凝土抗硫酸盐结晶破坏的能力有明显降低。

The strength, expansion and amount of scaling of concrete with compound mineral admixture （CMA） from steel slag, granulated blast furnace slag and fly ash were studied. The result shows that damage by crystallization press from sulfate attack under wetting-drying alternation is much larger than that from sulfate chemical attack. Adding CMA to concrete could retard the damage from expansion of concrete caused by sulfate chemical attack, but the resistance of concrete to damage by crystallization press from sulfate attack was remarkably reduced.