再生骨料原位強(qiáng)化對再生混凝土及其結(jié)構(gòu)性能的影響*
單玉川1，沈翀2，孔德玉3，張材1，章雪峰1
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(1 浙江工業(yè)大學(xué)工程設(shè)計集團(tuán)有限公司，杭州 310014; 2 浙江綠城建筑設(shè)計有限公司，杭州 310007; 3 浙江工業(yè)大學(xué)建筑工程學(xué)院，杭州 310014)
［摘要］在摻合料裹骨料攪拌工藝的基礎(chǔ)上引入納米硅溶膠，實現(xiàn)再生骨料原位強(qiáng)化，研究了原位強(qiáng)化對不同再生粗骨料取代率再生混凝土強(qiáng)度及結(jié)構(gòu)性能的影響。結(jié)果表明：摻合料裹骨料工藝實現(xiàn)再生骨料原位強(qiáng)化，能有效改善再生粗骨料替換造成的強(qiáng)度損失，取代率較低時，28d強(qiáng)度甚至超過天然混凝土的；取代率為60%時，強(qiáng)度僅略有下降。采用原位強(qiáng)化技術(shù)制作的再生混凝土梁和天然混凝土梁，裂縫發(fā)展及最終破壞的形態(tài)相似，承載力可與天然混凝土梁媲美，甚至比天然混凝土梁具有更大的剛度和極限荷載。［關(guān)鍵詞］原位強(qiáng)化; 再生骨料; 界面過渡區(qū); 摻合料裹骨料攪拌工藝中圖分類號：TU375 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2016)12-0037-04
Influence of in-situ strengthening of recycled aggregate on the performance of recycled aggregate concrete and its structureShan Yuchuan1, Shen Chong2, Kong Deyu3, Zhang Cai1, Zhang Xuefeng1(1 Zhejiang University of Technology Engineering Design Group Co., Ltd., Hangzhou 310014, China; 2 Zhejiang Greencity Architectural Design Co., Ltd., Hangzhou 310007, China; 3 Civil Engineering and Architecture College, Zhejiang University of Technology, Hangzhou 310014, China)Abstract: In-situ strengthening of recycled aggregate (RA) was realized by incorporating colloidal silica sol on the basis of the admixture-coat mixing method and the influences on the strength of recycled aggregate concrete (RAC) with different replacement of RA and also the properties of steel reinforced RAC structure were investigated. The results show that the in-situ strengthening of the RA by admixture-coat mixing method can effectively compensate the strength loss caused by the replacement of RA. The strength of the hardened RAC with a lower substitution rate at 28d is even higher than that of the natural aggregate concrete (NAC). When the replacing rate is 60%, the strength is only slightly decreased. The RAC beam manufactured using in-situ reinforcement technology features the similar crack development process and final failure pattern as the NAC beam. The bearing capacity can also be comparable with the NAC beam, and the stiffness and ultimate load can even be greater than the latter.Keywords: in-situ strengthening; recycled aggregate; interfacial transition zone; admixture-coat mixing method
*浙江省科技廳公益性項目（2015C33019）。通訊作者：章雪峰，高級工程師，Email:12639404@qq.com。
