再生粗骨料混凝土基本徐变试验及再生粗骨料混凝土徐变的二维随机凸骨料计算模型研究

Research on basic creep of recycled coarse concrete and two-dimensional stochastic convex aggregate calculation model of creep of recycled coarse concrete

以再生粗骨料取代率为参数,进行了再生混凝土基本徐变试验。试验结果表明,再生混凝土基本徐变度随再生粗骨料取代率的增加而增加。在试验研究的基础上,采用ANSYS软件建立了再生混凝土二维随机凸骨料徐变计算模型,并对再生粗骨料混凝土的徐变进行了计算,计算结果表明,该模型可以较好的计算再生混凝土的徐变。在此基础上,采用再生混凝土二维随机凸骨料徐变计算模型研究了再生粗骨料和老砂浆的随机分布,再生粗骨料的级配,天然骨料和老砂浆的含量、力学性能和徐变性能等因素对再生混凝土徐变的影响。研究结果表明,再生混凝土中老砂浆的含量、老砂浆的徐变和再生粗骨料的级配对再生混凝土徐变具有较大影响,老砂浆的弹性模量对再生混凝土的徐变具有不利影响,再生粗骨料和老砂浆的随机分布、天然粗骨料弹性模量对再生混凝土徐变影响较小。

The test on basic creep of recycled coarse aggregate concrete(RAC)was conducted by varying the recycled coarse aggregate(RCA)replacement rate.The test results shows that the specific creep of RAC increase with the increase of RCA replacement rate.Based on the test study,two-dimensional stochastic convex aggregate calculation model of creep of recycled coarse concrete is established by adopting the ANSYS software and creep of RAC is calculated by this calculation model.The results reveal that this calculation model can calculate the RAC creep well.Based on above,the influence of stochastic distribution of RAC and old mortar,gradation of coarse aggregate,content of natural coarse aggregate and old mortar,creep and mechanical properties of natural coarse aggregate and old mortar on creep of RAC were studied.The results show that the influence of content and creep properties of old mortar,gradation of recycled coarse aggregate on creep of RAC is significantly.And creep of RAC increase with the increase of old mortar elastic model,influence of stochastic distribution of RAC and old mortar,elastic model of natural coarse aggregate to RAC creep is negligibly.