摘要
为评价硫酸盐干湿循环耦合作用下磷酸钾镁水泥(MKPC)浆体的力学性能和物理性能,根据GB/T 3810.3—2016测试方法,通过真空保水和不同温度的真空烘干试验,设计出适用于MKPC浆体试件的干湿制度。遵循设计的干湿制度,测试MKPC试件在硫酸盐环境下进行不同干湿循环次数和全浸泡不同龄期的质量损失、强度变化。试验结果如下:经过反复试验,以相邻两次质量变化率<0.1%为标准,设计出MKPC试件1个干湿循环周期为72 h。MKPC试件在5%Na_(2)SO_(4)溶液干湿循环120次后其抗折强度、抗压强度较未干湿循环试件的强度分别下降24.44%、18.63%,质量损失为4.12%;在5%Na_(2)SO_(4)溶液浸泡360 d后,MKPC试件的抗折强度较未浸泡的强度下降1.23%,抗压强度较未浸泡的试件强度增加1.11%,质量损失为1.54%。因此,MKPC试件在干湿循环作用下对抗折强度变化和质量损失更加敏感。
In order to evaluate the mechanical and physical properties of magnesium potassium phosphate cement(MKPC)paste under the coupling effect of dry and wet cycles of sulfate,the dry and wet regimes applicable to the MKPC paste specimens were designed by vacuum saturation and vacuum drying tests at different temperatures according to GB/T 3810.3—2016 test method.The designed wet and dry regimes were followed to test the mass loss and strength change of MKPC specimens under sulfate environment for different number of wet and dry cycles and different ages of full immersion.The test results were as follows:After repeated tests,the MKPC specimen was designed with a dry and wet cycle of 72 h for 1 dry and wet cycle with the rate of change of mass<0.1%for two adjacent times.The flexural strength and compressive strength of MKPC specimens decreased by 24.44%and 18.63%after 120 dry and wet cycles of 5%Na_(2)SO_(4) solution compared with those of specimens without dry and wet cycles,respectively,with a mass loss of 4.12%.After soaking in 5%Na_(2)SO_(4) solution for 360 d,the flexural strengths of MKPC specimens decreased by 1.23%compared with those of unsoaked specimens,the compressive strengths of MKPC specimens increased by 1.11%compared with those of unsoaked specimens,with a mass loss of 1.54%.Therefore,MKPC specimens were more sensitive to flexural strength changes and mass loss under the action of wet and dry cycles.
作者
李涛
何昱龙
胡夏闽
侯宇颖
吴嵌嵌
彭思远
杨建明
LI Tao;HE Yulong;HU Xiamin;HOU Yuying;WU Qianqian;PENG Siyuan;YANG Jianming(School of Civil Engineering,Sanjiang University,Nanjing 210012,China)
出处
《中国测试》
CAS
北大核心
2024年第1期69-76,共8页
China Measurement & Test
基金
国家自然科学基金面上项目(51578475)
江苏高校‘青蓝工程’资助项目(苏教师函[2023]27号)。
关键词
磷酸钾镁水泥
硫酸盐侵蚀
干湿循环
强度
质量损失
potassium magnesium phosphate cement
sulfate attack
wet and dry cycles
strength
mass loss
