Experimental Studies On The Mechanical And Impermeability Performance Of The Recycled Coarse Aggregate Concrete

It is extremely important and provided with profound and lasting meaning forthe sustainable development of construction industry that recycling constructionwaste can not only make contributions to the problems caused by wasting ofresources such as land occupied by construction waste，but also reduce project costsin significant measure and economize building costs. More comprehensive grasp ofthe mechanical behavior and durability of regenerated concrete and putting them intheir right perspective are of overreaching importance to the all-round developmentabout the applications of regenerated concrete in constructional engineering.Apart from summarizing overseas and domestic research actuality about theperformance capabilities and the utilization situation of regenerated concrete afterconsulting a number of internal and external pertinent literatures, this thesisstudied the triaxial strength under triaxial compression test, shearing behavior under direct shear test and the impermeability of regenerated concrete by designing several groups of regenerated concrete with their own mix proportioning according to the recycled coarse aggregate replacement percentage. The results showed that:(1)Triaxial compressive strength, peak axial strain, peak shear stress and thelevel of peak shear strain of the recycled concrete reduced with the increasing ofrecycled coarse aggregates replacement rate.(2) As the recycled coarse aggregate rate increased, bearing triaxial pressure, therecycled coarse aggregate concrete’s vertical modulus of deformation increased,when the recycled coarse aggregates completely replace the natural coarse aggregate,the recycled coarse aggregate concrete’s vertical modulus of deformation increasedby9.4%to29.4%more than the ordinary natural gravel concrete’s vertical modulus of deformation.(3) As the recycled coarse aggregate rate increased, the recycled coarseaggregate concrete’s shear modulus gradually reduced, when the recycled coarseaggregates completely replace the natural coarse aggregate, the shear modulus of therecycled coarse aggregate concrete reduced about95%to96%of the ordinary naturalgravel concrete’s shear modulus. (4) The recycled concrete seepage height was higher than ordinary concrete, thatis to say recycled coarse aggregate concrete water impermeability performance wasworse than ordinary concrete.