再生骨料自密实混凝土力学与长期性能研究
引用文献：
伊庆刚 琚花花 张启志. 再生骨料自密实混凝土力学与长期性能研究[J]. 建筑结构，2023，48（12）：87-90，86.
YI Qinggang JU Huahua ZHANG Qizhi. Research on mechanical and long-term performance of recycled aggregate self-compacting concrete[J]. Building Structure，2023,48（12）：87-90，86.
摘要：为了研究再生骨料对自密实混凝土力学和长期性能的影响规律，以再生骨料的掺量与级配为变量，制备了4种不同配合比的自密实混凝土拌合物，对其抗压强度、劈裂抗拉强度和抗折强度进行了测试，并对其孔径分布和长期徐变行为机理进行了分析。结果表明：采用再生骨料制备自密实混凝土是可行的，适当掺入再生骨料不会显著影响自密实混凝土的和易性和间隙通过性。在适当的再生骨料取代率下，自密实混凝土的力学性能可以等于甚至高于对照组；自密实混凝土的微观结构受再生骨料的掺量和级配的影响显著，这造成了混凝土中微孔、介孔和大孔数量的显著差异，进而影响了其短期的新拌性能和长期的收缩应力及徐变行为。
关键词：自密实混凝土；再生骨料；孔隙率；长期性能；
基金：国家自然科学基金项目(51778105)；绿色高性能混凝土材料及其应用研究(ZGYGC1026)。
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[4] 唐和生，陈杉杉，薛松涛.钢纤维自密实混凝土疲劳寿命预测不确定分析的证据理论方法[J].哈尔滨工程大学学报，2019,40(10):1729-1734.
[5] 王磊，李泉龙，陈杏.再生粗骨料混凝土的变形性能及影响因素分析[J].建筑结构，2016,46(2):30-34.
[6] GOMEZ-SOBERON J M V.Relationship between gas adsorption and the shrinkage and creep of recycled aggregate concrete[J].Cement,Concrete and Aggregates,2013,25(2):1-7.
[7] 王怀亮，张楠.改性再生骨料对自密实混凝土性能的影响[J].哈尔滨工业大学学报，2016,48(6):150-156.
[8] 刘清，韩风霞，于广明，等.再生粗骨料自密实混凝土基本力学性能[J].建筑材料学报，2020,23(5):1053-1060.
[9] REVILLA-CUESTA V,SKAF M,FALESCHINI F,et al.Self-compacting concrete manufactured with recycled concrete aggregate:an overview[J].Journal of Cleaner Production,2020,262:121362.
[10] 田义.C80自密实混凝土配制及性能研究[D].重庆：重庆大学，2016.
[11] 吴德通.高强自密实清水混凝土制备与性能及质量控制研究[D].南京：东南大学，2017.
[12] JACINTHO A E P G A,CAVALIERE I S G,PIMENTEL L L,et al.Modulus and strength of concretes with alternative materials[J].Materials,2020,13(19):4378.
[13] KOU S C,POON C S.Properties of self-compacting concrete prepared with coarse and fine recycled concrete aggregates[J].Cement and Concrete Composites,2009,31(9):622-627.
[14] 赵木子，杨华，王玉银，等.考虑基体混凝土水灰比影响的再生粗(细)骨料混凝土徐变模型[J].建筑结构学报，2020,41(12):148-155.
Research on mechanical and long-term performance of recycled aggregate self-compacting concrete
Abstract: In order to reveal the influence of recycled aggregates on the mechanical and long-term performance of self-compacting concrete, four self-compacting concrete mixtures with different mix ratios were prepared with the content and gradation of recycled aggregates as variables, and their compressive strength, split tensile strength and flexural strength were tested, and its pore size distribution and long-term creep behavior mechanism were analyzed. The results show that it is feasible to prepare self-compacting concrete by using recycled aggregate, and appropriate addition of recycled aggregate will not significantly affect the workability and clearance permeability of self-compacting concrete. The mechanical properties of self-compacting concrete can be equal to or even higher than those of the control group. The microstructure of self-compacting concrete is significantly affected by the content and gradation of recycled aggregates. The significant difference in the number of micropores, mesopores and macropores in concrete has been found to affect its short-term fresh mixing performance and long-term shrinkage stress and creep behavior.
Keywords: self-compacting concrete; recycled aggregate; porosity; long-term performance
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