机制砂-铜尾矿复合砂商品混凝土性能研究

发布时间：2018-01-19 22:57

本文关键词： 混合砂混凝土砂率性能干缩率　出处：《武汉理工大学学报》2014年12期 　论文类型：期刊论文

【摘要】：机制砂天然级配不良是其广泛应用的制约因素之一。采用河砂、铜尾矿与机制砂制备混合砂用作混凝土细集料。采用"5点法"对机制砂混凝土(M)、河砂混凝土(R)、机制砂-河砂混凝土(MR)、机制砂-铜尾矿(MC)混凝土的砂率进行优化,并研究混合砂混凝土性能。结果表明:混合砂混凝土的最优砂率比河砂混凝土高4%。混合砂混凝土的强度、弹性模量均高于河砂和机制砂混凝土,且强度增长较大;铜尾矿的掺入增加了需水量和干缩率,但对抗氯离子渗透性以及离析泌水性有很大改善;机制砂-河砂体系具有较小的干缩率。
[Abstract]:The poor natural grading of machined sand is one of the limiting factors in its wide application. Mixed sand is prepared by river sand, copper tailings and machined sand as fine aggregate of concrete. The sand ratio of river sand concrete, machined sand and river sand concrete, machined sand and copper tailing concrete are optimized. The results show that the optimum sand ratio of mixed sand concrete is 4% higher than that of river sand concrete. The strength and elastic modulus of mixed sand concrete are higher than that of river sand and machined sand concrete. And the intensity increases greatly; The addition of copper tailings increased water demand and dry shrinkage, but the resistance to chloride ion permeability and the water capacity of separation and secretion were greatly improved. The mechanism sand-river sand system has small dry shrinkage rate.
【作者单位】：湖北楚天高速公路有限公司;广东省长大公路工程有限公司;深圳市建筑工务署;武汉理工大学材料科学与工程学院;
【基金】：人工砂混凝土材料设计与工程应用研究(2011-02-057) 广东省公路工程机制砂混凝土应用技术指南研究(2012-03-006)
【分类号】：TU528
【正文快照】： 天然河砂是一种短期内不可再生资源,而且其分布有很强的地域性限制,机制砂的应用可缓解我国多地出现的天然河砂供应短缺。机制砂产量大,可充分利用开挖废石,相对于天然砂在矿物组成、表面形貌、表面质地方面有着独特的性质[1]。但机制砂天然级配中粗颗粒和细颗粒通常较多,而中

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