磷酸镁混凝土路面快速修补材料的耐水性试验  

Water Resistance of Magnesium Phosphate Concrete Pavement with Rapid Repairing Materials

作　　者：俞家欢[1] 闫林伟 YU Jiahuan;YAN Linwei(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2018年第5期855-863,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51478276)

摘　　要：目的研究不同外加剂对磷酸镁混凝土耐水性能的影响.方法掺入无机外加剂磷酸盐、硅灰、聚丙烯纤维等外加剂来对磷酸镁混凝土的力学性能、体积稳定性和强度保留率进行分析,与基准混凝土进行对比,从而确定各种外加剂磷酸镁混凝土的耐水性优劣.结果当掺入的磷酸二氢钾与原材料磷酸二氢铵质量比为2∶3时,磷酸镁混凝土力学强度发展较好,且在水中体积稳定性较为理想;当硅灰掺量为5%时,强度保留率达到最高值80. 5%;当硅灰掺量为10%时,试件抗压强度低于基准试件,且在水养条件下强度产生倒缩,耐水性较差.结论磷酸盐对磷酸镁混凝土耐水性改性效果优于掺加铁盐和铝盐的耐水性,适当掺量的硅灰能够有效改善磷酸镁混凝土的耐水性能,聚丙烯纤维能够与磷酸镁混凝土产生协同作用耐水性能更为显著.The purpose of this paper is to study the effect of different admixtures on the water resistance of magnesium phosphate concrete.The mechanical properties,volume stability and strength retention of magnesium phosphate concrete are studied and analyzed with different admixtures phosphate,silica fume and polypropylene fiber,and the water resistance of various additive magnesium phosphate concrete is determined by comparing with the reference concrete.When the mass ratio of potassium dihydrogen phosphate and ammonium hydrogen phosphate of raw materials is 2∶3,the mechanical strength of magnesium phosphate concrete is the best,and the volume stability in water is ideal.When the content of silica fume is 5%,the strength retention rate is reached the maximum value which is 80.5%.When the silica fume content is 10%,the compressive strength of the specimen is lower than that of the reference specimen,and the strength falls down and the water resistance is poor under the condition of water culture.The effect of phosphate on the water resistance of magnesium phosphate concrete is better than that of adding iron salt and aluminum salt.The appropriate amount of silica fume can effectively improve the water resistance of magnesium phosphate concrete,and the polypropylene fiber can produce synergistic effect with magnesium phosphate concrete,and the water resistance performance is more significant.

关 键 词：磷酸镁混凝土 力学性能 体积稳定性 强度保留率 耐水性 

分 类 号：TU528.37[建筑科学—建筑技术科学] U414[交通运输工程—道路与铁道工程]