再生混凝土剪切性能试验研究

Experimental Study of Shear Performance of Recycled Aggregate Concrete

为研究再生混凝土的剪切性能,对再生混凝土的力学性能有更深入的认识,通过RMT-150,C岩石力学试验系统对再生混凝土立方体试块进行了直剪剪切试验,探讨了水灰比相同的条件下,再生粗骨料取代率及混凝土强度等级对再生混凝土剪切性能的影响.研究表明:再生混凝土的剪切破坏过程与普通混凝土相似;当混凝土强度等级相同时,再生混凝土的峰值剪应变、峰值剪应力、剪切模量随再生粗骨料取代率的增加而降低;当再生粗骨料取代率相同时,再生混凝土的峰值剪应变、峰值剪应力、剪切模量随混凝土强度等级的减小而降低.

In order to study shear performance of recycled aggregate concrete （RAC） and have a deeper understanding of structure performance of RAC, the influence of recycled coarse aggregate （RCA）replacement ratio and concrete cube strength on shear performance of RAC with the same W/C, the study is discussed through the direct shear test of the concrete cubes by RMT-150C. It indicates that failure process of the sheared RAC cubes is similar to that of natural concrete. The peak shear strain, peak shear stress and shear modulus of RAC reduce with the increase of RAC replacement ratio and with the decrease of concrete cube strength.