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In order to study cube compressive strength of recycled lightweight aggregate concrete, with the change parameters of replacement rate of recycled lightweight coarse aggregate, 15 standard cube test blocks were designed and produced to carry out compressive strength test. The failure process and failure mode of test blocks were recorded; cube compressive strength of test blocks were measured, based on the principle of least square method, the relation curves between cube compressive strength and replacement rate were all analyzed and fitted, the influence change parameters made on cube compressive strength was discussed. It is shown that splitting failure occurs in the test blocks of recycled lightweight aggregate concrete at last; the relations between cube compressive strength and replacement rate are all linear functions; cube compressive strength of recycled lightweight aggregate concrete increases as replacement rate of recycled lightweight coarse aggregate decreases. Introduction With the rapid development of urbanization process in China, a lot of construction waste is generated by the demolition and renovation of existing buildings and new construction [1~2]. According to statistics [3], at present, construction waste has reached 30% to 40% of municipal waste in China, of which 50% to 60% was waste concrete. Landfilling simply or duming openly construction waste is a waste of limited land and resources, the natural environment will be polluted. Moreover, For a long time, due to the source of aggregate of sand and stone is extensive, and the cost of one is inexpensive, so aggregate is mined arbitrarily, and natural aggregate has already depleted in some areas. Effectively dealing with construction waste and shortage of natural aggregate has important significance for the sustainable development of the construction industry [4~5]. At present, technology of recycled aggregate concrete has become an effective way of construction waste resource utilization [6]. However, The sources of recycled coarse aggregate in RAC is wide, in previous studies[7~9], recycled coarse aggregate was mostly from ordinary concrete, while the studies on source from the demolished lightweight aggregate concrete structures (such as long-span bridges, high-rise building, road pavement, et al) are little. As a construction waste source, through the RAC technology, the purpose of building waste recycling for lightweight aggregate concrete can be achieved. And after the recycled light coarse aggregate is joined, ordinary concrete not only inherits the advantages of small weight of lightweight aggregate concrete, excellent thermal performance and good seismic performance, but also improves the mechanical property defect such as low strength of lightweight aggregate concrete and bad elastic modulus and so on. 2nd Annual International Conference on Advanced Material Engineering (AME 2016) © 2016. The authors Published by Atlantis Press 630 Based on the compressive test of 15 recycled lightweight aggregate concrete block, the uniaxial compressive strength and influence factors of recycled lightweight aggregate concrete were in-depth analyzed to enrich the research content of RAC structure, so the reference and mirror for further research and application of recycled lightweight aggregate concrete were provided. Test overview Test Materials The raw materials including cement, natural coarse aggregate, recycled lightweight coarse aggregate, river sand and water were used to prepare recycled lightweight aggregate concrete. The P.O 42.5 cement produced by the Jiaozuo limited company of sturdy cement was adopted, the continuous grade gravel was selected as natural coarse aggregate as shown in Fig.1(a), recycled lightweight coarse aggregate shown in Fig.1(b) was derived after the tested cube blocks of lightweight aggregate concrete in structure hall of Henan Polytechnic University was crushed, screened, washed and dried, the destroyed test blocks were made up of lightweight aggregate concrete of LC25 and LC20, the crushed lightweight aggregate concrete blocks were uniformly mixed in a 1:1 volume ratio to produce the recycled light coarse aggregate, grain composition of recycled lightweight coarse aggregate kept same with one of natural coarse aggregate, the basic physical property indexes of the two coarse aggregates were shown in Tab.1. It was shown that bulk density and apparent density of recycled lightweight coarse aggregate are much smaller than ones of natural coarse aggregate, and absorption of recycled lightweight coarse aggregate was up to about 9.5%, higher than ones of recycled ordinary coarse aggregate, this is because not only a large number of cement mortar is adhered on the surface of recycled lightweight coarse aggregate, but also the interior of recycled lightweight coarse aggregate is made up of porous lightweight aggregate with high water absorption. Middle sand was selected as river sand, tap water was selected as mixing and conservation water. (a) Natural coarse aggregate (b) Recycled lightweight coarse aggregate Fig.1 Coarse aggregate Tab.1 The basic physical property indexes of natural coarse aggregate and recycled lightweight coarse aggregate Aggregate Category Grain size /mm Bulk density /(kg/m) Apparent density /(kg/m) Water absorption /% Voidage /% Natural coarse aggregate 5~31.5 1481 2500 0.62 40.76 Recycled lightweight coarse aggregate 5~31.5 776 1389 9.46 44.13 Mix Proportion Replacement rate of recycled lightweight coarse aggregate is the bulk volume proportion between recycled lightweight coarse aggregate and all the coarse aggregate. Replacement rates of 0%, 25%, 50%, 75% and 100% were designed in this test, mix proportion of recycled lightweight aggregate

Test Study on Cube Compressive Strength of Recycled Lightweight Aggregate Concrete