不同再生骨料取代率的再生混凝土性能试验研究(英文)
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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。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。
In order to apply recycled aggregate concrete(RAC) more effectively,the physical and mechanical proper-ties of recycled aggregates(RA) from quake-stricken area were tested.The mechanical properties and the strength variation against time of RAC with different RA replacement ratios were studied based on mixing design of different RAC.The results showed that the performance of RAs is different from NAs,such as higher porosity,3.5 times high-er water absorption,10% lower density and acceptable strength and surface texture.The RAC with different RA re-placement ratios indicates lower density,compressive strength and tensile strength than those of natural concrete.The higher the RA replacement ratio is,the more reduction is.The study on the strength variation against time showed that the absorbed water in RA of the RAC would release gradually with hydration reaction,which improves the strength development,and finally even could result in higher strength than that of natural concrete.Meanwhile,the failure modes of RAC and natural concrete were observed and analyzed from the broken surfaces.The experiment re-sults would provide references to further research on structural hollow sections filled with recycled concrete.
In order to apply recycled aggregate concrete(RAC) more effectively,the physical and mechanical proper-ties of recycled aggregates(RA) from quake-stricken area were tested.The mechanical properties and the strength variation against time of RAC with different RA replacement ratios were studied based on mixing design of different RAC.The results showed that the performance of RAs is different from NAs,such as higher porosity,3.5 times high-er water absorption,10% lower density and acceptable strength and surface texture.The RAC with different RA re-placement ratios indicates lower density,compressive strength and tensile strength than those of natural concrete.The higher the RA replacement ratio is,the more reduction is.The study on the strength variation against time showed that the absorbed water in RA of the RAC would release gradually with hydration reaction,which improves the strength development,and finally even could result in higher strength than that of natural concrete.Meanwhile,the failure modes of RAC and natural concrete were observed and analyzed from the broken surfaces.The experiment re-sults would provide references to further research on structural hollow sections filled with recycled concrete.
引文
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[8]Xiao Jianzhuang,Li Jiabin,Zhang Ch.Mechanical propertiesof recycled aggregate concrete under uniaxial loading[J].Cement and Concrete Research,2005,35:1187-1194.
[9]JGJ53-92,Quality standards and test methods of gravel orpebbles in ordinary concrete[S].Beijing:China Academyof Building Research,1993.[JGJ53-92,普通混凝土用碎石或卵石质量标准及检验方法[S].北京:中国建筑科学研究院,1993.]
[2]Xiao Jianzhuang,Xie He,Wang Changchun,et al.Statisti-cal analysis on building waste in Wenchuan earthquake-hitarea[J].Journal of Sichuan University:Engineering Sci-ence Edition,20094,1(3):188-194.[肖建庄,谢贺,王长春,等.汶川地震灾区建筑废物统计分析[J].四川大学学报:工程学科版,2009,41(3):188-194.]
[3]Hansen T C.Recycled aggregate concrete sencond state-of-art report developments 1945-1985[J].Material andStructure,1986,19(111):201-246.
[4]Tabsh S W,Abdelfatah A S.Influence of recycled concreteaggregate on strength properties of concrete[J].Construc-tion and Building Materials,2009,23(2):1163-1167.
[5]Vivian W Y,Tam C M.Assessment of durability of recycledaggregare concrete produced by two-stage mixing approach[J].Journal of Material Science2,007,42:3592-3602.
[6]Evangelista L,de Brito J.Mechanical behaviour of concretemade with fine recycled concrete aggregates[J].Cement&Concrete Composites,2007,29:397-401.
[7]Tabsh S W,Abdelfatah A S.Influence of recycled concreteaggregate on strength properties of concrete[J].Construc-tion and Building Materials,2009,23(2):1163-1167.
[8]Xiao Jianzhuang,Li Jiabin,Zhang Ch.Mechanical propertiesof recycled aggregate concrete under uniaxial loading[J].Cement and Concrete Research,2005,35:1187-1194.
[9]JGJ53-92,Quality standards and test methods of gravel orpebbles in ordinary concrete[S].Beijing:China Academyof Building Research,1993.[JGJ53-92,普通混凝土用碎石或卵石质量标准及检验方法[S].北京:中国建筑科学研究院,1993.]
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