水泥稳定砖与混凝土再生集料基层的性能研究

发布时间：2018-01-08 11:26

本文关键词：水泥稳定砖与混凝土再生集料基层的性能研究　出处：《中国公路学报》2017年02期 　论文类型：期刊论文

【摘要】：为了研究水泥稳定砖与混凝土建筑垃圾再生集料基层性能,采用扫描电子显微镜和工业CT分别对砖渣、旧混凝土和新集料的表面与内部结构进行扫描,开展了再生集料与新集料的基本特性试验,并进行了对比分析;针对不同掺量再生集料,开展了4种水泥剂量稳定基层混合料的7d无侧限抗压强度试验以及质量分数为4%的水泥稳定基层混合料的不同龄期无侧限抗压强度、不同龄期劈裂强度、90d抗压和劈裂回弹模量、抗冲刷、抗冻融、干缩与温缩等一系列系统室内试验,对比分析了试验结果;铺筑了试验路并进行了跟踪监测。试验结果表明:与天然集料相比,再生集料表面微孔隙多且内部含孔隙或微裂隙,其密度小、吸水率大、压碎值大;随再生集料掺量的增加,混合料的最大干密度和最佳含水率分别呈近似线性减小和增大;随再生集料掺量的增加,混合料的无侧限抗压强度、劈裂强度、抗压模量与劈裂模量均呈先增后减的变化规律,抗冲刷能力下降,抗冻融性能变化不大,干缩系数减小,温缩系数变大;7d无侧限抗压强度和90d劈裂强度均满足规范的要求;试验路性能良好,证明砖与混凝土再生集料用作半刚性基层材料是可行的。
[Abstract]:In order to study the properties of cement stabilized brick and concrete building garbage recycled aggregate base, the surface and internal structure of brick slag, old concrete and new aggregate were scanned by scanning electron microscope and industrial CT, respectively. The basic characteristic tests of recycled aggregate and new aggregate were carried out, and the comparative analysis was carried out. According to the different amount of recycled aggregate. The unconfined compressive strength test of four kinds of cement dose-stabilized base mixture was carried out in 7 days, and the unconfined compressive strength and splitting strength of cement stabilized base mixture with mass fraction of 4% at different ages and different ages were also carried out. A series of laboratory tests, such as 90 days compressive and splitting resilience modulus, scour resistance, frost resistance, dry shrinkage and temperature shrinkage, were carried out and the test results were compared and analyzed. Compared with natural aggregates, there are more micro-pores on the surface of regenerated aggregates, with small density, large water absorption and large crushing value. With the increase of recycled aggregate content, the maximum dry density and the optimum moisture content of the mixture decrease linearly and increase respectively. With the increase of recycled aggregate content, the unconfined compressive strength, splitting strength, compressive modulus and splitting modulus of the mixture increased first and then decreased. The dry shrinkage coefficient decreases and the temperature shrinkage coefficient increases; The unconfined compressive strength of 7 days and the splitting strength of 90 days all meet the requirements of the code. It is proved that brick and concrete recycled aggregate can be used as semi-rigid base material.
【作者单位】：长沙理工大学交通运输工程学院;湖南云中再生科技股份有限公司;
【基金】：湖南省科技支撑计划项目(2015SK2063)
【分类号】：U414
【正文快照】： 0引言据住建部公布的最新规划,到2020年中国还将新建住宅300亿m2,由此产生的建筑垃圾至少达50亿t[1]。以往,建筑垃圾大多采用填埋,甚至直接堆放于空地等方式处理,不仅占用大量土地,而且会造成严重的水和空气污染。因此,如何处理这些巨量的建筑垃圾已成为当今亟须解决的难题。

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