废弃混凝土用作再生路面的试验研究

发布时间：2018-05-17 17:44

本文选题：道路工程 + 废弃混凝土　；参考：《深圳大学学报(理工版)》2017年03期

【摘要】：结合湖北省宜昌市东山大道改建项目,将废弃的混凝土面板破碎加工成再生集料,并将再生集料全部替代天然集料用于混凝土生产中.检测分析再生集料的颗粒级配、压碎值、针片状颗粒含量、表观密度和吸水率等工程性质指标,在此基础上通过对不同养护龄期下再生混凝土的抗压强度和抗折强度进行测试,以此分析其力学性能.结果表明,采用废弃混凝土面板再生粗、细集料配制的混凝土强度能达到轻交通等级公路面层对强度的要求;再生集料的压碎值、颗粒级配及坚固性等主要指标均达到水泥混凝土路面材料的要求,吸水率和细集料的含泥量偏大,通过预吸水和筛洗可使其达到路面材料的要求;再生混凝土的坍落度偏小,保水性及和易性较好,能满足现场施工要求;再生混凝土的强度随着龄期的增加逐渐增大,且增大趋势逐渐变缓;再生混凝土的破坏特征与普通混凝土相似,但再生混凝土的抗压强度增长值与龄期的对数不成正比例关系.
[Abstract]:Combined with the reconstruction project of Dongshan Avenue in Yichang, Hubei Province, the discarded concrete slab is broken and processed into recycled aggregate, and all recycled aggregate is replaced by natural aggregate to be used in concrete production. The particle gradation, crushing value, needle particle content, apparent density and water absorption of recycled aggregate were measured and analyzed. The compressive strength and flexural strength of recycled concrete were tested under different curing ages. The mechanical properties are analyzed. The results show that the strength of concrete prepared with recycled concrete face slab and fine aggregate can meet the requirements of light traffic grade highway surface, and the crushed value of recycled aggregate, The main indexes such as particle gradation and firmness can meet the requirements of cement concrete pavement materials, the water absorption and fine aggregate content are on the high side, through pre-absorption and sieve washing, they can meet the requirements of pavement materials, and the slump of recycled concrete is small, The strength of recycled concrete increases gradually with the increase of age, and the increasing trend becomes slower. The failure characteristics of recycled concrete are similar to that of ordinary concrete. However, the increasing value of compressive strength of recycled concrete is not proportional to the logarithm of age.
【作者单位】：三峡大学三峡地区地质灾害与生态环境湖北省协同创新中心;三峡大学土木与建筑学院;宜昌市城市建设投资开发有限公司;
【基金】：住房和城乡建设部科学技术资助项目(2015-k4-13)~~
【分类号】：U416.2

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