石粉含量对C60机制砂海工混凝土耐久性的影响研究  

Study on the effects of rock dust content on the durability of C60 manufactured sand marine concrete

作　　者：李北星[1] 尹立愿 冯紫豪 樊立龙 叶仙松 

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,湖北武汉430070 [2]山东省交通科学研究院,山东济南250000 [3]中铁建大桥工程局集团第一工程有限公司,辽宁大连116033

出　　处：《混凝土》2017年第10期169-173,共5页Concrete

基　　金：国家自然科学基金资助项目(51372185)

摘　　要：研究了花岗岩机制砂石粉含量(5%、7%、10%)对C50机制砂海工混凝土(MSC)耐久性关键参数的影响,并与河砂混凝土(RSC)进行比较。结果表明:当机制砂石粉含量为7%时,混凝土的抗碳化性能、氯离子扩散系数及其龄期衰减系数、抗硫酸盐侵蚀性能、护筋性能等耐久性指标均达到最佳,且优于河砂混凝土;另外,外掺4.5%~15%石粉均改善了胶浆的氯离子结合性能,当石粉掺量为胶材质量的7.5%时,氯离子结合能力最强。Effects of rock dust content （5% ,7%, 10% ） on the key parameters in durability of C50 marine concrete made from granite manufactured sand and its comparison with river sand concrete were studied in this investigation.The results show that MSC with rock dust content of 7% exhibits optimum durability properties including anti-carbonation, chloride diffusion coefficient and its decay coefficient with curing age, resistance to sulphate attack and ability of protecting rebar from corrosion.Additionally, rock dust replacement for binding material in proportions from 4.5% to 15% can improve the chloride-ion binding capacity of cementitious material pastes.And the chlo- ride-ion binding capacity observed at 7.5% replacement of cementitious materials was maximum.

关 键 词：机制砂海工混凝土 氯离子扩散系数 硫酸盐侵蚀 护筋性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]