Durability and Crack Control of Concrete using Fluosilicates Based Composite
The crack presented in concrete structures causes a structural defect, the durability decrease, and external damages etc.Therefore, it is necessary to improve durability through the effort to control the crack. Fluosilicic acid (H2SiF6) is recovered as aqueous solution which absorbs SiF4 produced from the manufacturing of industrial-graded H3PO4 or HF. Generally,fluosilicates prepared by the reaction between H2SiF6 and metal salts. Addition of fluosilicates to cement endows odd properties through unique chemical reaction with the fresh and hardened cement. Mix proportions for experiment were modulated at 0.45 of water to cement ratio and 0.0 ～0.2％ of adding ratio of fluosilicate salt based inorganic compound, the tests were performed about design strength (21, 24, 27MPa) with 0.5％ of adding ratio of fluosilicate salt based inorganic compound. Applications of fluosilicate salt based inorganic compound to reduce cracks resulted from plastic and drying shrinkage, to improve durability are presented in this paper. Durability was evaluated as neutralization, chloride ion penetration depth, freezing thawing resistant tests and weight loss according reinforcement corrosion. It is ascertained that the concrete added fluosilicate salt based inorganic compound showed an ability to reduce the total area and maximum crack width significantly as compared nonadded concrete. In addition, the durability of concrete improved because of resistance to crack and watertightness by packing role of fiuosilicate salt based inorganic compound obtained and pozzolanic reaction of soluble SiO2 than non-added concrete.
Fluosilicate Salt based Inorganic Compound Crack Reduction Drying Shrinkage Water Tightness Durability
Dosu Kim Baesu Khil Hyundo Yun Kijoo Kwon Seunggu Han
Ph.D,Tripod Co.Inc.,Korea Professor,Dept.of Architectural Engineering,Chungnam National University,Korea Chief,Structural Engineering Lab.KEPRI.Korea CEO,Kyeryong Co.Inc.,Korea
国际会议
北京
英文
822-825
2008-10-01（万方平台首次上网日期，不代表论文的发表时间）