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Influence of mineral admixture on the resistance to penetration of chloride ions into concrete

XIE You-jun~1, LIU Bao-ju~1, LIU Wei~2 (1.School of Civil Engineering and Architecture, Central South University, Changsha 410075,China; 2.College of Architecture and Civil Engineering, Shenzhen University, Shenzhen 518060, China)  
This paper studies the effects of water-cement ratio, two minerals admixtures of fly ash and silica fume on penetration of chloride ions into concrete by the rapid chloride permeability test method as designated in ASTM C1202.The experimental results show that the decrease of w/c can reduce the penetration of chloride ions into concrete, but it is not effective enough in improving the resistance to penetration of chloride ions by decreasing water-cement ratio, and only when mineral admixtures were added into concrete can this problem be effectively solved. The concrete containing fly ash can decrease the penetration of chloride ions into concrete, and the larger the fly ash content is, the lower the permeability of concreteis. The fineness of fly ash has great influence on the permeability of concrete within 28-day ages, and has less influence on that of in later age. The addition of silica fume can evidently decrease the penetration of chloride ions into concrete, and the resistance to penetration of chloride ions into concrete can be further improved by combining silica fume with fly ash added into concrete. This indicates that the important technical way to prepare the concrete with lowest penetration of chloride ions is the addition of the composite of fly ash and silica fume taking account of all factors. The packing role and pozzolanic effects of minerals admixtures are mainly responsible for the improvement of resistance to penetration of chloride ions into concrete.
【Fund】: 国家自然科学基金资助项目 ( 5 0 1780 14 ) ;; 国家 863计划资助项目 ( 2 0 0 2AA3 3 5 0 2 0 )
【CateGory Index】: TU528
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