矿物掺合料对碱式硫酸镁水泥耐硫酸盐腐蚀性能的影响

为了研究粉碱式硫酸镁水泥耐硫酸盐腐蚀性能,对不同材料组成的碱式硫酸镁水泥浸入水和硫酸钠溶液中各龄期抗折强度、抗压强度、质量变化及水化产物进行了分析.结果表明,在0.3 mol/L的硫酸钠溶液试验环境下,掺入粉煤灰对水泥抗折抗蚀性能改善较为显著,而掺入矿渣对水泥抗压抗蚀性能改善较为显著.掺入粉煤灰和矿渣的碱式硫酸镁水泥180 d的抗折抗蚀系数和抗压抗蚀系数与未掺加矿物掺和料的碱式硫酸镁水泥相比分别提高了0.61和0.15;掺入粉煤灰和矿渣的碱式硫酸镁水泥各龄期的吸水率均低于未加外掺料的碱式硫酸镁水泥的吸水率,同时粉煤灰和矿渣的掺入能有效抑制Mg(OH)2晶相的产生.

Effect of Mineral Admixtures on Corrosion Resistance Properties to Sulfate Attack of Basic Magnesium Sulfate Cement

In order to study the corrosion resistance properties of basic magnesium sulfate cement to sulfate attack, the flexural strength, compressive strength, mass change and hydrations products of cement with different material component were analyzed after immersing in water and sodium sulfate solution for different ages.The results show that fly ash improved the corrosion resistance coefficient of flexural strength and slag improved the corrosion resistance coefficient of compressive strength significantly in the environment of 0.3 mol/L sodium sulfate solution.The corrosion resistance coefficient of flexural strength and corrosion resistance coefficient of compressive strength are increased by 0.61 and 0.15 respectively compared with the basic magnesium sulfate cement without mineral admixture after immersing in sodium sulfate solution 180 d.The water absorption of the basic magnesium sulfate cement with fly ash and slag is lower than that without mineral admixture.At the same time,the incorporation of fly ash and slag can effectively inhibit the formation of Mg(OH)2 crystal phase.