本文關(guān)鍵詞： 模型再生混凝土 應(yīng)變速率 靜力試驗 動態(tài)力學(xué)特性 應(yīng)力-應(yīng)變曲線　出處：《建筑結(jié)構(gòu)學(xué)報》2014年03期 　論文類型：期刊論文

【摘要】：試驗設(shè)計了再生粗骨料取代率為100%的模型再生混凝土(MRC)、模型普通混凝土(MC)、再生粗骨料取代率55%的模型再生混凝土(MCP)和模型砂漿(MM)4種試件,在不同應(yīng)變速率下進(jìn)行單軸受壓試驗。研究表明:隨著加載應(yīng)變速率的提高,試件應(yīng)力-應(yīng)變曲線形狀相似,峰值應(yīng)力和彈性模量表現(xiàn)出增大的趨勢,峰值應(yīng)變的變化無明顯規(guī)律;MRC、MC、MCP試件破壞時裂縫最先出現(xiàn)在界面區(qū)附近,然后逐漸發(fā)展直至貫通,隨著應(yīng)變速率的提高,裂縫較寬且開展更快,試件完全斷裂成若干碎塊;模型再生混凝土靜態(tài)強(qiáng)度越低,峰值應(yīng)力和彈性模量增長越大,動態(tài)效應(yīng)越顯著;再生粗骨料取代率為55%時,峰值應(yīng)力和彈性模量增長最大;模型砂漿試件的動態(tài)效應(yīng)最顯著,模型普通混凝土和模型再生混凝土次之,且相差不大。
[Abstract]:Four kinds of test specimens were designed, such as model recycled concrete with replacement ratio of 100% coarse aggregate, model ordinary concrete, model recycled concrete with recycled coarse aggregate replacement rate of 55% and model mortar. Uniaxial compression tests were carried out at different strain rates. The results showed that the shape of stress-strain curve was similar with the increase of strain rate, and the peak stress and elastic modulus showed an increasing trend. The change of peak strain is not obvious. The fracture first appears near the interface area when the MCP specimen is destroyed, and then develops gradually until through. With the increase of strain rate, the crack is wider and develops faster, and the specimen is completely broken into a number of fragments. The lower the static strength of recycled concrete is, the greater the peak stress and elastic modulus are, and the more significant the dynamic effect is, the more significant the dynamic effect is when the replacement ratio of recycled coarse aggregate is 55, and the dynamic effect of model mortar specimen is the most significant when the replacement ratio of recycled coarse aggregate is 55. Model ordinary concrete and model recycled concrete are the second, and the difference is not significant.
【作者單位】： 同濟(jì)大學(xué)建筑工程系;
【基金】：國家自然科學(xué)基金項目(51178340,51325802)
【分類號】：TU528

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