摘要
氯离子侵蚀引起钢筋锈蚀是导致混凝土结构耐久性降低甚至结构破坏的一个主要原因,同样再生骨料混凝土的抗氯离子渗透性直接关系到结构的安全和工程应用的耐久性。鉴于此,用ASTM C1202法对掺入粉煤灰、矿渣等微细矿物掺合料和加入高效减水剂的再生骨料混凝土以及天然骨料的氯离子渗透性进行了对比试验。试验结果表明粉煤灰、矿粉等矿物掺合料可以有效地改善再生骨料混凝土的氯离子渗透性,且随着强度的提高养护龄期的增长,再生骨料混凝土的抗氯离子渗透性增强,试验结果表明虽然再生骨料混凝土的抗氯离子渗透性较天然骨料混凝土差,但仍具有很好的抗氯离子渗透性。
The corrosion of steel bar caused by the chloride ion eroding into the concrete is the main reason of durability descent and fracture of the concrete structure, and in the same way, the resistance of chloride ion penetration of recycled aggregate concrete is directly related to the safety and durability of the recycled aggregate concrete structure. Aiming at those, the contrast test of chloride ion penetrability of the recycled aggregate concrete and the natural aggregate concrete which were added in fly ash, granulated blast-fumace slag and high-rang water reducing agent was carried out by using the method of ASTM C1202. The test results indicate that the minimal admixtures, such as fly ash, granulated blast-furnace slag and so on, can effectively improve the chloride ion penetrability of the recycled aggregate concrete to some extent, and the resistance of chloride ion penetration of recycled aggregate concrete has been intensified with the growth of the concrete＇s strength and curing age. The test results also show that the resistance of chloride ion penetration of recycled aggregate concrete remains good, but the resistance of chloride ion penetration of recycled aggregate concrete is lower than that of the natural aggregate concrete.
出处
《武汉理工大学学报》
EI
CAS
CSCD
北大核心
2006年第5期33-36,共4页
Journal of Wuhan University of Technology
基金
教育部博士学科点基金(20050487034)
湖南省教育厅优秀青年项目(04B011)
湖南省建设厅资助项目(03-28)
关键词
再生骨料混凝土
矿物掺合料
导电量
氯离子渗透性
recycled aggregate concrete
mineral admixtures
charge passed
resistance of chloride ion penetration
