首页|自密实全再生混凝土单轴受压性能及强度指标换算关系研究

自密实全再生混凝土单轴受压性能及强度指标换算关系研究

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为深入了解自密实全再生混凝土单轴受压力学性能,以水胶比(0.36、0.40、0.45)与粉煤灰掺量(20%、30%、40%、50%、70%)为变化参数,设计并制作 11组(共 99个)自密实全再生混凝土试件对其立方体抗压强度、轴心抗压强度和弹性模量进行试验研究,观察试件受压破坏过程及破坏形态,获取各力学性能指标的变化趋势,基于试验结果及现有文献成果,建立强度指标换算关系,并提出自密实全再生混凝土的本构方程.研究表明:自密实全再生混凝土受压破坏过程及破坏形态与普通混凝土相似,总体上自密实全再生混凝土立方体抗压强度、轴心抗压强度及弹性模量随水胶比、粉煤灰掺量的增加而降低,所提计算式可较好预测自密实全再生混凝土的单轴受压性能指标及本构关系.
Study on uniaxial compression performance and strength index conversion relationship of self-compacting fully recycled concrete
In order to deeply understand the uniaxial compression performance of self-compacting fully recycled concrete,11 groups(99 in total)of self-compacting fully recycled concrete specimens were designed and manufactured with water-binder ratio(0.36,0.40,0.45)and fly ash content(20%,30%,40%,50%,70%)as changing parameters.The cube compressive strength,axial compressive strength and elas-tic modulus were tested and studied.The compression failure process and failure mode of the specimens were observed,and the change trend of each mechanical performance index was obtained.Based on experimental results and previous literature results,the conversion re-lationship of strength index was established.The constitutive equation of self-compacting recycled concrete is proposed.The results show that the failure process and failure mode of self-compacting fully recycled concrete are similar to those of ordinary concrete.In general,the cubic compressive strength,axial compressive strength and elastic modulus of self-compacting fully recycled concrete decrease with the in-crease of water-binder ratio and fly ash content.The proposed formula can better predict the uniaxial compression performance index and constitutive relationship of self-compacting fully recycled concrete.

self-compacting fully recycled concretecompressive strengthelastic modulusfly ashwater-binder ratiostrength index conversion relationshipconstitutive equation

韦柳媚、郑述芳、黄媚、陈祥花、廖浩宇、梁莹、陈宗平

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广西大学 土木建筑工程学院,广西 南宁 530004

广西农业职业技术大学 城乡建设学院,广西 南宁 530007

南宁学院 土木与工程建筑学院,广西 南宁 530200

广西防灾减灾与工程安全重点实验室,广西 南宁 530004

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自密实全再生混凝土 抗压强度 弹性模量 粉煤灰 水胶比 强度指标换算关系 本构方程

国家自然科学基金八桂学者专项广西科技基地与人才专项中央引导地方科技发展资金项目广西壮族自治区重点研发计划广西农业科技自筹经费项目广西壮族自治区高等学校中青年教师科研基础能力提升项目南宁市科技重大专项

51578163[2019]79号桂科AD21075031桂科ZY21195010桂科AB21220012Z2022322023KY122520223024

2024

10.3969/j.issn.1002-3550.2024.03.004

混凝土
中国建筑东北设计研究院有限公司

混凝土

CSTPCD北大核心
影响因子：0.844
ISSN：1002-3550
年,卷(期)：2024.(3)
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