摘要
通过单纯型重心设计法研究了不同掺合料比例下石灰石粉-矿粉-水泥三元胶凝体系清水混凝土的流变特性、抗压强度、抗氯离子渗透性能和外观质量。结果表明:石灰石粉有利于降低混凝土的屈服应力,提高流动性;矿粉有利于增加混凝土的塑性黏度,提高抗离析性;适量石灰石粉和矿粉掺入可以提高清水混凝土的抗氯离子渗透性能,增强清水混凝土的外观均一性及色泽度,但掺合料掺量越高时混凝土的抗压强度越低;当石灰石粉掺量为10%~15%,矿粉掺量为0~15%,水泥掺量为85%~88%时,复合石灰石粉清水混凝土在满足3、28 d抗压强度以及抗氯离子渗透性能的同时具有良好的工作性和外观质量。
The rheological properties,compressive strength,chloride ion impermeability,and appearance quality of fair faced concrete with a ternary cementitious system consisting of limestone powder,mineral powder,and cement under different proportions of admixtures were studied using the simple center of gravity design method.The results show that limestone powder is beneficial for reducing the yield stress of concrete,improving flowability,while mineral powder is beneficial for increasing the plastic viscosity of concrete and improving its resistance to segregation.The addition of appropriate amount of limestone powder and mineral powder can improve the chloride ion permeability of fair faced concrete,enhance the appearance uniformity and color of fair faced concrete,but the higher the amount of admixture,the lower the compressive strength of concrete.When the content of limestone powder is 10%~15%,the content of mineral powder is 0~15%,and the content of cement is 85%~88%,the composite limestone powder fair faced water concrete has good workability and appearance quality while meeting the requirements of 3 d and 28 d compressive strength,and chlo-ride ion impermeability.
作者
马必聪
王新科
李威
刘民
李炜
MA Bicong;WANG Xinke;LI Wei;LIU Min;LI Wei(Guangxi Road and Bridge Engineering Group Co.Ltd.,Nanning 530200,China;Guangxi Subote New Materials Technology Co.Ltd.,Guigang 537100,China;State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Subote New Materials Co.Ltd.,Nanjing 211103,China)
出处
《新型建筑材料》
2024年第5期63-68,122,共7页
New Building Materials
基金
中央引导地方科技发展资金项目(20221229)。
关键词
石灰石粉
清水混凝土
单纯型重心设计法
流变性能
limestone powder
fair faced concrete
simple center of gravity design method
rheological properties
