海水海砂再生混凝土单轴受压应力-应变全曲线
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作者:
作者单位:

1.同济大学 土木工程学院,上海 200092;2.福州大学 土木工程学院,福建 福州 350116;3.同济大学 土木工程防灾国家重点实验室,上海 200092

作者简介:

张凯建(1989—),男,工学博士,主要研究方向为海水海砂再生混凝土材料性能。 E-mail: kaijian.zhang@fzu.edu.cn

通讯作者:

肖建庄(1968—),男,教授,博士生导师,工学博士,主要研究方向为再生混凝土材料与结构。 E-mail: jzx@tongji.edu.cn

中图分类号:

TU375

基金项目:

国家自然科学基金(52078358, 52008304);中国博士后科学基金(2019M661620)


Complete Stress-strain Curves of Seawater Sea Sand Recycled Aggregate Concrete Under Uniaxial Compression
Author:
Affiliation:

1.College of Civil Engineering, Tongji University, Shanghai 200092, China;2.College of Civil Engineering, Fuzhou University, Fuzhou 350116, China;3.State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China

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    摘要:

    为探究海水海砂再生混凝土(SSRAC)力学性能,设计了不同配合比下海水海砂再生混凝土棱柱体试件,并进行了单轴受压应力?应变全曲线测试。在试验加载应变率10-5 s-1和10-2 s-1下,得到了试件的破坏模式,分析了峰值应力、峰值应变和弹性模量的变化规律以及应变率、再生粗骨料(RCA)取代率和贝壳含量对上述指标的影响规律,讨论了海水海砂再生混凝土的动态增长因子(DIF)。基于电子计算机断层扫描(CT)测试得到了海水海砂再生混凝土内部的孔隙分布,对应力?应变曲线的特征指标变化趋势进行了解释。最后,在现有再生混凝土单轴受压本构模型的基础上,考虑特征指标的动态增长因子,通过修正下降段形状系数得到了预测应力?应变全曲线。

    Abstract:

    To explore the mechanical properties of seawater sea sand recycled aggregate concrete (SSRAC), SSRAC prisms were designed with different mix proportions. The complete stress-strain curves were tested under uniaxial compression with the strain rates of 10-5 s-1 and 10-2 s-1. Failure modes of specimens and the peak stress, strain at peak stress and elastic modulus were analyzed. And the effects of the strain rate, replacement ratio of recycled coarse aggregate (RCA) and shell particle contents on the above indices as well as the dynamic increase factor (DIF) were discussed. Meanwhile, the pore distribution of SSRAC from computed tomography (CT) tests was used to explain the development of characteristic indices of stress-strain curves. Finally, based on the existing uniaxial compression constitutive models of RAC, the predicted complete stress-strain curve was obtained by taking the DIF of characteristic indices and the modified shape factor of descending branch into account.

    参考文献
    [1] XIAO J Z, QIANG C B, NANNI A, et al. Use of sea-sand and seawater in concrete construction: current status and future opportunities[J]. Construction and Building Materials, 2017, 155: 1101.
    [2] 曹雪晴,张勇,何拥军,等. 中国近海建筑用海砂勘查回顾与面临的问题[J]. 海洋地质与第四纪地质, 2008, 28(3): 121.
    [3] TENG J G, YU T, DAI J G, et al. FRP composites in new construction: current status and opportunities[C]//Proceedings of the 7th National Conference on FRP Composites in Infrastructure. Hangzhou:[s.n.], 2011: 58.
    [4] 肖建庄,张凯建,曹万林,等. 考虑时变可靠度的再生混凝土结构设计[J]. 建筑结构学报, 2020, 41(12): 17.
    [5] 肖建庄. 再生混凝土[M]. 北京: 中国建筑工业出版社, 2008.
    [6] XIAO J Z, ZHANG Q T, ZHANG P, et al. Mechanical behavior of concrete using seawater and sea-sand with recycled coarse aggregates[J]. Structural Concrete, 2019, 20(5): 1631.
    [7] GUO M, HU B, XING F, et al. Characterization of the mechanical properties of eco-friendly concrete made with untreated sea sand and seawater based on statistical analysis[J]. Construction and Building Materials, 2020, 234: 117339.
    [8] ASTM. Standard practice for the preparation of substitute ocean water: D1141―98 [S]. Philadelphia: ASTM, 2013.
    [9] 中华人民共和国住房和城乡建设部. 海砂混凝土应用技术规范: JGJ 206―2010 [S]. 北京: 中国建筑工业出版社, 2010.
    [10] The International Organization for Standardization. Fine and coarse aggregates for concrete, determination of the particle mass-per-volume and water absorption,pycnometer method: ISO 7033∶1987[S]. New York:The International Organization for Standardization, 2014.
    [11] XIAO J Z, ZHANG K J, AKBARNEZHAD A. Variability of stress-strain relationship for recycled aggregate concrete under uniaxial compression loading[J]. Journal of Cleaner Production, 2018, 181: 753.
    [12] XIAO J Z, LI L, SHEN L M, et al. Compressive behaviour of recycled aggregate concrete under impact loading[J]. Cement and Concrete Research, 2015, 71: 46.
    [13] SURYAVANSHI A, SCANTLEBURY J, LYON S. Mechanism of Friedel’s salt formation in cements rich in tri-calcium aluminate[J]. Cement and Concrete Research, 1996, 26(5): 717.
    [14] MEHTA P K, MONTEIRO P J M. Concrete : microstructure, properties, and materials[M]. Upper Saddle River: Prentice-Hall, 2013.
    [15] British Standards Institution. Eurocode 2, design of concrete structures, part 1-1: general rules and rules for buildings[M]. London: British Standards Institution, 2004.
    [16] XIAO J Z, LI J B, ZHANG C. Mechanical properties of recycled aggregate concrete under uniaxial loading[J]. Cement and Concrete Research, 2005, 35(6): 1187.
    [17] 中华人民共和国住房和城乡建设部.混凝土结构设计规范: GB 50010―2010[S]. 北京: 中国建筑工业出版社, 2010.
    [18] 李龙,肖建庄,黄凯文. 再生混凝土力学性能的应变率敏感性数值模拟[J]. 东南大学学报(自然科学版), 2017, 47(4): 776.
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张凯建,肖建庄,张青天.海水海砂再生混凝土单轴受压应力-应变全曲线[J].同济大学学报(自然科学版),2021,49(12):1738~1745

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  • 收稿日期:2021-03-02
  • 在线发布日期: 2021-12-30
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