建筑垃圾再生混凝土的力学性能试验及在公路面层中的应用研究

发布时间：2018-07-27 18:39

【摘要】：本课题来自江西省研究生创新基金项目《建筑垃圾再生混凝土在路面面层中的的应用研究》,项目编号:YC2015-S063。本文首先对江西省建筑垃圾量进行了调查统计,结果显示江西省建筑垃圾年产量逐年增加。之后对再生混凝土的性能研究现状,路用性能研究现状和其路面应用现状做了简单的介绍,并对建筑垃圾再生粗骨料的物理性能和建筑垃圾再生混凝土的力学性能进行试验研究。试验结果表明:再生粗骨料具有表观密度小、吸水率大和压碎值大的特点;建筑垃圾再生混凝土的抗压强度和抗折强度均随着水灰比的增大而减少;当再生粗骨料中掺25%废砖粗骨料时,建筑垃圾再生混凝土的力学性能满足新建水泥路面面层对材料的要求;当掺量达50%时,此时废砖粗骨料的掺量对再生混凝土的力学性能影响较大;通过合理的配合比设计及改性,建筑垃圾再生混凝土可以在较高等级的公路面层中应用。最后本文对建筑垃圾再生混凝土在公路面层的应用提出建议:为了增强再生混凝土性能,可以考虑在再生混凝土中加入粉煤灰等矿物掺合料或在混凝土面板中配置钢筋;建筑垃圾再生混凝土的拌合用水由附加水和配合比用水两部分组成,附加水的用量建议按废砖粗骨料吸水率的75%进行计算;废砖粗骨料在再生粗骨料中的占比控制在25%以内。
[Abstract]:This topic comes from Jiangxi Province graduate student innovation foundation project "the construction waste recycled concrete application research in the pavement surface layer", the project number is: YC2015-S063. In this paper, the quantity of construction garbage in Jiangxi Province is investigated, and the results show that the annual output of construction garbage in Jiangxi Province is increasing year by year. After that, the research status of recycled concrete, road performance and pavement application are briefly introduced. The physical properties of recycled coarse aggregate and the mechanical properties of recycled concrete are studied. The test results show that the recycled coarse aggregate has the characteristics of low apparent density, high water absorption and large crushing value, and the compressive strength and flexural strength of recycled concrete decrease with the increase of water-cement ratio. When the recycled coarse aggregate is mixed with 25% waste brick coarse aggregate, the mechanical properties of recycled concrete can meet the requirements of the new cement pavement surface layer, and when the amount of recycled coarse aggregate is up to 50%, At this time, the content of coarse aggregate of waste brick has a great influence on the mechanical properties of recycled concrete, and through reasonable mix design and modification, recycled concrete of construction waste can be used in high grade highway surface layer. Finally, the paper puts forward some suggestions on the application of recycled concrete of construction waste in highway surface: in order to enhance the performance of recycled concrete, we can consider adding mineral admixture such as fly ash to recycled concrete or placing steel bar in concrete slab; The mixing water for recycled concrete of construction waste consists of two parts: additional water and mix water. The amount of additional water should be calculated according to 75% of the absorbency of coarse aggregate of waste brick, and the proportion of coarse aggregate of waste brick in recycled coarse aggregate is controlled within 25%.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U414

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