水玻璃模数对地聚物再生混凝土力学性能的影响
作者:
作者单位:

1.沈阳建筑大学 土木工程学院,辽宁 沈阳 110168;2.武汉理工大学 硅酸盐建筑材料国家重点实验室,湖北 武汉 430070;3.沈阳建筑大学 材料科学与工程学院,辽宁 沈阳 110168

作者简介:

丁兆洋(1979—),男,辽宁沈阳人,沈阳建筑大学高级实验师,博士生.E-mail:dingzhaoyang@sjzu.edu.cn

通讯作者:

周静海(1965—),男,黑龙江尚志人,沈阳建筑大学教授,博士生导师,博士.E-mail:zhoujinghai@sjzu.edu.cn

中图分类号:

TU528.1

基金项目:

国家自然科学基金资助项目(51678374);硅酸盐建筑材料国家重点实验室(武汉理工大学)开放基金(SYSJJ2021-13);住房和城乡建设部科技计划项目(2019-K-48);沈阳市“双百工程”重大科技成果转化项目(Z19-4-011)


Effect of Modulus of Water Glass on Mechanical Properties of Geopolymer Recycled Aggregate Concrete
Author:
Affiliation:

1.School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China;2.State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;3.School of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang 110168, China

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    摘要:

    采用地聚物为胶凝材料、废弃混凝土为粗骨料,制备了地聚物再生混凝土(GRAC),研究了不同水玻璃模数(n)条件下GRAC的力学性能,分析了其微观结构对力学性能的影响机理.结果表明:地聚物的强度由两种凝胶态水化产物提供,其分别具有层状的水化硅铝酸钙(C-A-S-H)结构和网络状的水化硅铝酸钠(N-A-S-H)结构;GRAC的抗压强度随n降低而增加;GRAC抗压强度的尺寸换算系数与n的大小相关,强度标准差随n增加而减小;在以n为变量的GRAC抗压强度本构方程中,n与GRAC应力-应变曲线的上升段拟合系数为多项式函数关系,与下降段拟合系数为有理分式函数关系.

    Abstract:

    Geopolymer recycled aggregate concrete(GRAC) was prepared by replacing cement with geopolymer and natural aggregate with demolished concrete. The effect of the modulus of water glass(n) on the mechanical properties of GRAC was studied and the mechanism of influence of its microstructure on the mechanical properties was analyzed. The results show that there are two kinds of gel structures in geopolymer hydration products, aluminium-modified calcium silicate hydrate(C-A-S-H) layered structure and sodium aluminosilicate hydrate(N-A-S-H) network structure, both of which contribute to the strength of GRAC. The compressive strength of GRAC increases with the decrease of n. The dimensional conversion factor of compressive strength of GRAC is correlated with n, and the standard deviation of compressive strength decreases with the increase of n. In the constitutive equation of compressive strength of GRAC with n as variable, the up-portion coefficient has polynomial relation to n, and the down-portion coefficient has rational fraction relation to n.

    表 3 再生骨料的基本性能Table 3 Basic properties of recycled aggregate
    表 5 应力-应变归一化曲线的边界条件Table 5 Boundary conditions of normalized stress-strain curves
    表 7 GRAC应力-应变曲线拟合方程的参数及其拟合优度Table 7 Parameters and determination coefficients of normalized stress-strain curves of GRAC
    表 1 矿渣和粉煤灰的化学组成Table 1 Chemical compositions of slag and fly ash
    表 4 GRAC的配合比Table 4 Mix proportions of GRAC
    图1 水玻璃模数对GRAC抗压强度的影响Fig.1 Effect of moduli of water glass on compressive strengths of GRAC
    图2 不同水玻璃模数下地聚物净浆的XRD图谱Fig.2 XRD patterns of geopolymer pastes with water glasses of different moduli
    图3 不同水玻璃模数下GRAC 的SEM图片和EDS分析Fig.3 SEM images and EDS analysis of GRAC with water glasses of different moduli
    图4 水玻璃模数对不同尺寸GRAC立方体抗压强度的影响Fig.4 Effect of moduli of water glass on compressive strengths of GRAC cubes with different sizes
    图5 水玻璃模数对GRAC尺寸换算系数的影响Fig.5 Effect of moduli of water glass on dimensional conversion factors of GRAC
    图6 水玻璃模数对不同尺寸GRAC强度标准差的影响Fig.6 Effect of moduli of water glass on standard deviations of compressive strength of GRAC with different sizes
    图7 不同水玻璃模数下GRAC的应力-应变曲线Fig.7 Stress-strain curves of GRAC with water glasses of different moduli
    图8 不同水玻璃模数下GRAC的弹性模量、峰值应力和峰值应变Fig.8 Elastic moduli, peak stresses and peak strains of GRAC with water glasses of different moduli
    图9 不同水玻璃模数下GRAC的单轴受压应力-应变归一化曲线及其几何特征Fig.9 Normalized stress-strain curves of GRAC with water glasses of different moduli under uniaxial
    图10 不同水玻璃模数下GRAC 应力-应变归一化曲线的拟合结果Fig.10 Fitting results of normalized stress-strain curves of GRAC with water glasses of different moduli
    图11 两种数学模型的拟合优度Fig.11 Determination coefficients of two mathematical models
    图12 拟合曲线与实测曲线Fig.12 Fitting curves and test curves
    表 2 水玻璃的化学组成及基本性质Table 2 Chemical composition and basic properties of water glass
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引用本文

丁兆洋,苏群,李明泽,王晴,周静海.水玻璃模数对地聚物再生混凝土力学性能的影响[J].建筑材料学报,2023,26(1):61-70

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  • 收稿日期:2021-11-01
  • 最后修改日期:2022-01-09
  • 在线发布日期: 2023-02-01
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