磷酸镁混凝土的耐腐蚀性能研究  

Research on Corrosion Resistance of Magnesium Phosphate Concrete

作　　者：俞家欢[1] 丛广智 董金鑫[1] YU Jiahuan;CONG Guangzhi;DONG Jinxin(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

出　　处：《沈阳建筑大学学报（自然科学版）》2019年第6期1059-1066,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51478276)

摘　　要：目的研究解磷酸镁混凝土的耐腐蚀性能,以减小混凝土路面的腐蚀破坏.方法在磷酸镁混凝土中掺入铁盐、矿合物掺料(硅灰)、聚丙烯纤维,分别置于10%NaOH溶液、10%H2SO4溶液、5%NaCl溶液及H2O中,研究磷酸镁混凝土的抗压强度、体积稳定性和强度保留率,确定其耐腐蚀性的优劣.结果磷酸镁混凝土在不同溶液中表现的强度随时间变化趋势基本相同,掺加铁盐、矿合物掺料和聚丙烯纤维可以有效改善混凝土后期因溶液腐蚀造成的强度倒缩现象;体积膨胀率在14~28 d时期增长明显,28 d以后变化较小.结论适量铁盐、磷酸盐、矿合物掺料、聚丙烯纤维均能改善磷酸镁混凝土的抗腐蚀性能.In order to understand the effect of admixture on corrosion resistance of magnesium phosphate concrete,and reduce the corrosion damage of concrete pavement.Phosphate and mineral admixturesz(silicon ash),polypropylene fiber with different admixture of magnesium phosphate concrete,and put them in 10%NaOH solution,10%H2SO4 solution,5%NaCl solution and water,mechanical properties,volume stability and strength retention effects were analyzed,so as to determine the pros and cons of various corrosion resistance the concrete admixture of magnesium phosphate.The findings show that,intensity of magnesium phosphate concrete in different solutions shows the same trend with time.The addition of iron salt,mineral admixture and polypropylene fiber can effectively improve the strength shrinkage caused by solution corrosion in the later stage of concrete;the volume expansion rate is during the period of 14 d-28 d,the growth was obvious,and after 28 d,the change was small.Iron salt,phosphate,mineral,admixtures polypropylene fiber can improve the corrosion resistance of magnesium phosphate concrete.

关 键 词：磷酸镁混凝土 体积稳定性 力学性能 耐腐蚀性 

分 类 号：TU502[建筑科学—建筑技术科学]