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工程科学与技术:2010,42(Z1):170-176
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不同再生骨料取代率的再生混凝土性能试验研究
(1.四川大学;2.蒙纳什大学)
Experimental Study on the Properties of Recycled Aggregate Concrete with Different Replacement ratios from Earthquake-Stricken Area
(1.Sichuan University;2.Monash University)
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投稿时间:2010-04-13    修订日期:2010-06-09
中文摘要: 再生混凝土是一种循环再利用建筑拆毁废弃物的实用而经济的材料,现已受到广泛地关注和讨论。为了更有效地应用再生混凝土材料,有必要对其基本性能进行研究,特别是为了指导在灾后重建中的应用,应该对来自灾区的再生骨料及其加工成的再生混凝土的性能进行研究。本文中,试验测试了来自灾区再生骨料的物理和力学性能。通过不同再生混凝土的配合比设计,对比研究了具有不同再生骨料取代率的再生混凝土的力学性能以及不同龄期的再生混凝土强度。研究结果表明,再生骨料与天然骨料确实存在着一定的差别,比如表现在,再生骨料具有较高的孔隙率,其吸水率比天然骨料高出3.5倍,其密度比天然骨料降低10%,但具备可以接受的强度和表观形状。具有不同再生骨料取代率的再生混凝土表现出比天然混凝土具有更小的密度,抗压强度和抗拉强度。并且再生骨料取代率越高,其值降低越大。通过对不同龄期的再生混凝土的强度变化的研究,发现由于再生混凝土中再生骨料吸收的水分会随水泥水化作用缓慢地释放出来,从而促进了再生混凝土强度的发展,最后甚至可能超过天然混凝土的强度。另外,通过对试块受压破坏截面情况的观察,分析得到了再生混凝土和天然混凝土的失效模式。试验结果为进一步研究再生混凝土填充的中空钢管结构提供了参考。
Abstract:Recycled aggregate concrete (RAC) is a kind of practical and economic material to reuse the great amount of construction and demolition wastes, which has received many discussions nowadays. In order to apply RAC more effectively, it is necessary to study its properties especially for those aggregates from earthquake-stricken area for post-earthquake reconstruction. In this paper, the physical and mechanical properties of recycled aggregates (RA) from quake-stricken area are tested. The mix design with different RA replacement ratios is proposed to develop the RAC based on the comparison with natural aggregates (NA). Furthermore, the mechanical characteristics of RAC are studied. The results show that RAs indeed perform differently compared with NAs, such as higher porosity, 3.5 times higher water absorption, 10% lower density and acceptable strength and surface texture. The RAC with different RA replacement ratios indicate lower density, compressive strength and tensile strength than those of natural concrete. The higher the RA replacement ratio is, the more reduction is. The strength variation against time is also studied. The failure modes of RAC and natural concrete are observed and analyzed from the broken surfaces. The experiment results would provide references to further research on structural hollow sections filled with recycled concrete.
文章编号:201000354     中图分类号:    文献标志码:
基金项目:国家自然科学基金
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引用文本:
石宵爽,王清远,邱慈长,赵晓林.不同再生骨料取代率的再生混凝土性能试验研究[J].工程科学与技术,2010,42(Z1):170-176.
Shi Xiao-Shuang,Wang Qing-yuan,Qiu Ci-chang,Zhao Xiao-ling.Experimental Study on the Properties of Recycled Aggregate Concrete with Different Replacement ratios from Earthquake-Stricken Area[J].Advanced Engineering Sciences,2010,42(Z1):170-176.