再生混凝土抗冻性能试验研究及孔隙分布变化分析

doi:10.11896/cldb.20060204

材料导报

2021, Vol. 35

Issue (16): 16028-16034 https://doi.org/10.11896/cldb.20060204

无机非金属及其复合材料

再生混凝土抗冻性能试验研究及孔隙分布变化分析

邓祥辉¹, 高晓悦^2,3, 王睿¹, 赵崇基^2,3

1 西安工业大学建筑工程学院,西安 710021;
2 铁科院(深圳)研究设计院有限公司,深圳 518057;
3 深圳城市轨道交通减振降噪工程实验室,深圳 518057

Study on Frost Resistance and Pore Distribution Change of Recycled Concrete

DENG Xianghui¹, GAO Xiaoyue^2,3, WANG Rui¹, ZHAO Chongji^2,3

1 School of Civil and Architecture Engineering, Xi'an Technological University, Xi'an 710021, China;
2 Shenzhen Research and Design Institute, China Academy of Railway Sciences, Shenzhen 518057, China;
3 Shenzhen Urban Rail Transit Vibration Reduction and Noise Reduction Engineering Laboratory, Shenzhen 518057, China

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摘要再生混凝土抗冻耐久性与混凝土结构内部孔隙分布变化密切相关。为研究再生混凝土结构内部孔隙分布与抗冻耐久性的定量关系,选取再生粗骨料取代率为 0%、25%、50%、75%、100%的普通再生混凝土和引气再生混凝土作为研究对象,进行冻融循环试验和核磁共振试验,测试混凝土试件质量、动弹性模量、抗折强度以及结构内部孔隙分布情况。结果表明:在冻融循环试验中,加入引气剂可有效改善试件内部的中孔(0.01~0.05 μm)和大孔(0.05~1 μm)的占比,从而提高其抗冻性能;在10种不同配比中,引气天然骨料混凝土的抗冻性能最佳,其次是再生粗骨料替代率为50%的引气再生混凝土,其内部孔隙结构相比再生粗骨料替代率为25%、75%和100%的引气再生混凝土更加稳定;再生混凝土冻融循环后的抗折强度变化与结构内部孔隙的分布和占比密切相关。

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	邓祥辉
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关键词: 再生混凝土冻融循环核磁共振孔隙分布抗折强度

Abstract: The frost resistance durability of recycled concrete is closely related to the change of pore distribution in concrete structure. In order to study the quantitative relationship between pore distribution inside the recycled concrete structure and its frost resistance durability, ordinary recycled concrete and air-entrained recycled concrete with 0%, 25%, 50%, 75% and 100% replacement rate of recycled coarse aggregate were selected as the research objects. Freeze-thaw cycle test and nuclear magnetic resonance test were carried out to test the mass, dynamic modulus of elasticity, flexural strength and pore distribution in the structure. The results show that the air-entraining admixture(AEA) can effectively improve the proportion of mesopores (0.01—0.05 μm) and macropores (0.05—1 μm) in the specimen, so as to improve its frost resistance. In 10 different proportions, the natural aggregate concrete with AEA has the best frost resistance, followed by the recycled concrete with 50% replacement rate of recycled coarse aggregate, which is more stable than that with 25%, 75% and 100% replacement rate of recycled aggregate. The change of flexural strength of recycled concrete after freeze-thaw cycle is closely related to the distribution and proportion of pores in the structure.

Key words: recycled concrete freeze-thaw cycle nuclear magnetic resonance pore distribution flexural strength

发布日期: 2021-09-07

ZTFLH:

TU528

基金资助: 陕西省重点研发计划项目(2018SF-391); 陕西省住房和城乡建设厅科技计划项目(2017-K55); 西安市科技局高校人才服务企业项目(2019217214GXRC008CG009-GXYD8.2)

通讯作者: xianghuideng@xatu.edu.cn

作者简介: 邓祥辉,西安工业大学建筑工程学院,教授。2011年6月毕业于西安理工大学水电学院,获工学博士学位。2006年到西安工业大学建筑工程学院工作至今,主要从事地下工程支护理论与数值分析以及混凝土抗冻耐久性的研究。发表学术论文50多篇,SCI及EI检索15篇。

引用本文:

邓祥辉, 高晓悦, 王睿, 赵崇基. 再生混凝土抗冻性能试验研究及孔隙分布变化分析[J]. 材料导报, 2021, 35(16): 16028-16034.
DENG Xianghui, GAO Xiaoyue, WANG Rui, ZHAO Chongji. Study on Frost Resistance and Pore Distribution Change of Recycled Concrete. Materials Reports, 2021, 35(16): 16028-16034.

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http://www.mater-rep.com/CN/10.11896/cldb.20060204 或 http://www.mater-rep.com/CN/Y2021/V35/I16/16028

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