| 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. |
| 关键词: 地聚物再生混凝土 水玻璃模数 尺寸换算系数 应力-应变曲线 本构方程 |
| DOI：10.3969/j.issn.1007-9629.2023.01.009 |
| 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） |
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| Effect of Modulus of Water Glass on Mechanical Properties of Geopolymer Recycled Aggregate Concrete |
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DING Zhaoyang1,2, SU Qun1, LI Mingze3, WANG Qing3, ZHOU Jinghai1
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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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| 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. |
| Key words: geopolymer recycled aggregate concrete（GRAC） modulus of water glass dimensional conversion factor stress-strain curve constitutive equation |
