不同配合比氯氧镁水泥在卤水中强度发展规律试验研究  

Experimental research of strength development regularity of different ratiosof magnesium oxychloridecement in brine

作　　者：吴大龙[1] 刘庆伟[2] 于浩[2] 黄新[2] 

机构地区：[1]北京航空航天大学后勤基建处,北京100191 [2]北京航空航天大学土木工程系,北京100191

出　　处：《混凝土》2014年第4期24-27,共4页Concrete

基　　金：国家自然科学基金项目(51178021)

摘　　要：中国西部地区盐湖带分布大面积高含盐量的盐渍土，由于盐渍土对基于硅酸盐水泥的混凝土腐蚀严酷，将混凝土用于构筑地下设施难以满足耐久性的要求。氯氧镁水泥具有良好的耐盐腐蚀性能，但它是气硬性胶凝材料，其在卤水中强度发展规律尚无相关研究。对不同MgO／MgCl2比例的氯氧镁水泥经过不同方式养护后浸泡在中国青海察尔汗盐湖含盐量10％-40％浓度卤水中强度发展规律进行了试验研究，结果表明：适当配合比的氯氧镁水泥能够在适当浓度卤水中凝结硬化、发展并保持强度；氯氧镁水泥在卤水中水化物组成与已知氯氧镁水泥水化物相同；MgO／MgCl2比例和卤水浓度是影响氯氧镁水泥在卤水中硬化和稳定的重要因素。In western region of China distributes a large area of high salt concentration of saline soil.Portland cement concrete used in underground facilities cannot satisfy the demand of lifetime, due to the severe corrosion of saline soil.Magnesium oxychloride cement has perfect resistance to salt corrosion, but it is air-hardening material.There is not related research about the hydration, hardening and strength stability of magnesium oxychloride cement in brine.The strength development regularities of different ratios of MgO and MgCl2 of magne- sium oxychloride cement which were cured in different ways and then soaked in different concentrations of Golmud salt lake brine were studied.The results showed that the proper ratio of MgO and MgC12 of magnesium oxychloride cement could hydrate, harden, develop and keep strength; the hydrates of magnesium oxychloride cement in brine were the same as the known magnesium oxychloride cement hy-drates;the ratio of MgO and MgCl2 and the concentration of brine are the important factors which influence the hardening and stability of magnesium oxychloride cement in brine.

关 键 词：氯氧镁水泥 卤水 MGO MgCl2比例 强度 

分 类 号：TU528.01[建筑科学—建筑技术科学]