防腐阻锈剂对混凝土性能影响试验研究

将防腐阻锈剂按照不同比例等量取代普硅水泥配制混凝土,研究其对混凝土抗压强度、抗硫酸盐侵蚀系数、氯离子渗透系数、腐蚀电量等性能指标的影响,并通过SEM扫描电镜观察混凝土3 d、7 d、28 d的水泥水化产物形貌.研究结果表明:掺入防腐阻锈剂后,混凝土的工作性能、后期力学性能、抗硫酸盐侵蚀性能、氯离子渗透性能、抗氯盐侵蚀性能明显优于基准混凝土;防腐阻锈剂的掺入消耗了水泥中的C3A、水泥水化产生的Ca(OH)2,生成钙矾石和C-S-H凝胶,产生微膨胀效应使混凝土结构更加致密,提高了抗硫酸盐、氯盐侵蚀性能.

Experimental Study on Influences of Sulfate-resistant and Corrosion-inhibitingAdmixtures on the Performance of Concrete

Different percentages of sulfate-resistant and corrosion-inhibiting admixtures take the place of Portland cement equivalently to compound concrete and study the influence of concrete compression strength, sulfate attack coefficient, chloride penetration coefficient, electric quantity and other index and observe morphology of cement hydration product of concrete 3 d, 7 d, 28 d by SEM.The results show that after infusion of sulfate-resistant and corrosion-inhibiting admixtures, working performance, later mechanics performance, sulfate corrosion resistance performance, chloride penetration performance, and chlorine salt corrosion resistance performance are superior to normal concrete obviously;infusion of sulfate-resistant and corrosion-inhibiting admixtures can consume C3A and Ca(OH)2 produced by cement hydration and generate ettringite and C-S-H gel and produce micro-expansion effect, which makes the structure more compact and improves the performance of sulfate and chlorine salt corrosion resistance.