Research On Application Of Insulation Module Mixed Recycled Aggregate Concrete Shear Wall

Recycling construction waste and building energy efficiency have become more prominent problems in the process of urbanization in China,especially in areas where a large number of old buildings in the suburbs need to be demolished and rebuilt.These two problems need to be resolved urgently.The construction wastes generated during the demolition of urban and rural buildings are mainly waste clay bricks and waste concrete.The two kinds of wastes are mixed in a certain proportion and configured with recycled concrete,which can solve the problem of construction waste disposal on site and can be used again as construction raw materials.Building energy-saving generally uses thermal insulation materials to reduce building energy consumption.The thermal insulation module wall has the advantages of good thermal insulation performance and short construction period.It is suitable for low-rise buildings that require thermal insulation.Aiming at the above situation,this paper proposes GRAPEPS thermal insulation module mixed recycled aggregate concrete shear wall with the characteristics of high utilization rate of construction waste,good thermal insulation performance and short construction period.In this paper,an experimental study on the compressive strength and the conversion relationship between compressive strength of recycled concrete with different mixing ratios of coarse aggregates was first carried out.Then the mixed recycled aggregate concrete was used to cast the insulation block test block and the insulation module shear wall and carried out Vertical force performance test to explore the influence of the core ribs in the insulation module on the vertical bearing capacity and the vertical force performance of the wall..Main research content: Recycled coarse aggregate was prepared with 6 mixed ratios of mixed recycled coarse aggregate concrete and the corresponding cube compressive strength and prismatic compressive strength were measured.The effect of the mixed coarse aggregate ratio on the compressive strength was analyzed and given two conversion formula for compressive strength;The suitable mixing ratios were selected to cast 6 thermal insulation module test blocks,6 wall test pieces without thermal insulation modules and 1 mold wall test piece,and the vertical stress performance test was carried out on the module test block and the wall test piece;according to the test result of the insulation block test block,the influence of the core ribs between the modules on the vertical bearing capacity was analyzed and the corresponding reduction factor was given;through the test of the mold wall,the working performance of the mold wall was explored;changed the height-thickness ratio and eccentricity of the wall specimen of the insulation module,analyzed the influence of the high-thickness ratio and the eccentricity on the vertical bearing capacity of the wall,and derived the calculation formula of the vertical bearing capacity based on the test data;the finite element software ABAQUS was used to numerically simulate the wall specimens,and was verified by comparison with the test data.The results of the compressive strength test of the test block show that: The compressive strength of the cube and the prismatic compressive strength increase first,then decrease and then increase with the increase of the amount of waste concrete coarse aggregate;through the comparative analysis of the compressive strength of the cube and the prism,the conversion formula of the two strengths is given.The vertical bearing performance tests of the module test block and the wall test piece show that: The vertical bearing capacity of the module test block is reduced due to the existence of the internal core rib and the reduction factor is about 0.6;the vertical bearing capacity decreases with the increase of the wall height-thickness ratio,the stability of the wall is good,and there is no out-of-plane instability;the vertical bearing capacity decreases with the increase of eccentricity,and the failure of the wall is mainly brittle failure;the insulation module has little effect on the vertical bearing capacity of the wall specimen;according to the test results of the wall specimens,a calculation model for the thermal insulation module shear wall is proposed,and on this basis,the calculation formula of the vertical bearing capacity of the wall is given.The numerical simulation results are in good agreement with the test results,and the simulated damage phenomenon is not much different from the test damage phenomenon.