严寒环境下磷酸镁水泥砂浆与混凝土的粘结强度及影响因素研究
Bond Strength and Influencing Factors of Magnesium Phosphate Cement Mortar and Concrete in Severe Cold Environment
侯铁军 1李想 1张晨琛 1贾兴文 2侯鹏坤3
作者信息
- 1. 青海交通职业技术学院,西宁 810003
- 2. 重庆大学材料科学与工程学院,重庆 400045
- 3. 济南大学材料科学与工程学院,济南 250022
- 折叠
摘要
在严寒环境下实施混凝土路面的快速修复,要求修复材料具有早期强度高且与混凝土粘结强度好的特点.磷酸镁水泥(MPC)早期强度高,采用MPC制备快速修复材料时有利于在无养护条件下实现冬季混凝土路面的快速修复.本文研究了在严寒环境下,镁磷质量比(M/P)、硼镁质量比(B/M)和水胶比(W/C)对MPC砂浆与普通混凝土的粘结强度的影响,分析了 MPC砂浆与混凝土的界面粘结强度发展规律与粘结机制.结果表明,在严寒环境下,当M/P为4～5、B/M为0.02～0.03、W/C为0.12～0.14时更有利于提高MPC砂浆与普通混凝土的粘结强度,3 h粘结强度可达2.5 MPa,能满足严寒环境下混凝土路面的快速修复要求.
Abstract
The rapid repair of concrete pavement under severe cold environment requires the repair materials to have high early strength and high bond strength with concrete.Using magnesium phosphate cement(MPC)with high early strength to prepare rapid repair materials is beneficial for achieving rapid repair of concrete pavement under non curing conditions in the winter.The effects of magnesium phosphorus ratio(M/P),boron magnesium ratio(B/M),and water cement ratio(W/C)on bond strength between MPC mortar and ordinary Portland cement concrete(OPC)in severe cold environment were studied,and the interface bonding mechanism were analyzed.The results show that M/P 4～5,B/M 0.02～0.03,and W/C 0.12～0.14 are more conducive to improve bond strength between MPC mortar and OPC in severe cold environment.The 3 h bond strength between MPC mortar and OPC can exceed 2.5 MPa,meeting the requirements for rapid repair of concrete pavement in severe cold environment.
关键词
磷酸镁水泥/粘结强度/严寒环境/抗弯强度/界面特征/快速修复Key words
magnesium phosphate cement/bond strength/severe cold environment/flexural strength/interface characteristic/rapid repair引用本文复制引用
基金项目
青海省科技计划(2021-ZJ-733)
西宁市科技计划(2023-Y-19)
出版年
2024
国家科技期刊平台
NSTL
万方数据