再生粗骨料强化工艺对再生混凝土力学性能及耐久性能的影响  

Effect of enhancement methods for recycled coarse aggregate on mechanical performance and durability of recycled concrete

作　　者：刘凯华 陈钿渊 邹超英[2] 严佳川[2] LIU Kaihua;CHEN Tianyuan;ZOU Chaoying;YAN Jiachuan(School of Civil and Transportation Engineering,Guangdong University of Technology,Guangzhou 510006,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 510090,China)

机构地区：[1]广东工业大学土木与交通工程学院,广东广州510006 [2]哈尔滨工业大学土木工程学院,黑龙江哈尔滨510090

出　　处：《混凝土》2024年第6期134-137,142,共5页Concrete

基　　金：国家自然科学基金(52108123,51278151)。

摘　　要：分别采用级配强化、化学浆液强化和级配-化学浆液复合强化3种工艺对再生粗骨料进行品质提升,考察不同强化工艺对再生混凝土力学性能及耐久性能的影响。结果表明:当分形维数取2.6时,再生粗骨料的压碎指标最小,级配强化工艺对再生混凝土抗压强度的提升效果较好,但对弹性模量、抗碳化性能和抗冻性能的改善不明显;采用水泥外掺硅灰浆液强化的再生粗骨料可有效提高再生混凝土的弹性模量和抗冻性能,降低再生混凝土的碳化深度;级配-化学浆液复合强化工艺结合了两种单一强化工艺的特点,对再生混凝土力学性能和耐久性能的改善效果最佳。The qualityof recycled coarse aggregate was improved bythree methods:gradation enhancement,chemical slurryenhancement,and gradation-chemical slurry composite enhancement,and the effects of different enhancement methods on the mechanical properties and durability of recycled concrete were investigated.Results show that when the fractal parameter is set to 2.6,the crushing index of recycled coarse aggregate is the smallest,and the improvement effect of the compressive strength of recycled concrete is better,but the improvement of elastic modulus,anti-carbonation,and anti-freezing performance is not obvious.The recycled coarse aggregate reinforced with cement mixed with silica fume slurry can effectively improve the elastic modulus and frost resistance of recycled concrete and reduce the carbonation depth of recycled concrete.The grading-chemical slurry composite strengthening process combines the characteristics of two single enhancement methods and has the best effect on improving the mechanical performance and durability of recycled concrete.

关 键 词：再生混凝土 再生粗骨料 强化工艺 力学性能 耐久性 

分 类 号：TU528.041[建筑科学—建筑技术科学]