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邹庆余¹  , 周    理 ^1 , 3  , 胡    松² , 徐一峰¹ , 尹    超 ¹

( 1. 贵州大学建筑与城市规划学院 ，贵州 贵阳 550025 ; 2. 铜仁学院农林工程与规划学院 ，贵州 铜仁 554300;

3. 贵州省山地人居智慧与绿色建造工程研究中心 ，贵州 贵阳 550025)

摘   要： 为研究纤维增强磷石膏的受拉应力－应变曲线，将磷石膏粉 、水泥 、纤维的质量比设定为 90%、10%及 0. 2% , 以水灰比  (0. 7、0. 8、0. 9) 为变化参数，制作了 12 个棱柱体试块 。通过轴向单调拉伸试验，分析了纤维增强磷石膏的受拉应力－应变曲线、抗拉强度 、峰值应变等力学指标 。对归一化曲线进行拟合，给出了应力－应变曲线的数学表达式。研究表明，受拉应力－应变曲线呈非线性变化，且水灰比越低，曲线越陡峭； 当水灰比从 0. 7 增加至0. 8 及 0. 9 时，轴心抗拉强度分别降低了 11. 4%及 34. 3% ; 峰值拉应变受水灰比影响较小， 应变测量值位于 31. 5 με ~ 54. 8 με 区间。

关键词： 纤维； 磷石膏； 轴心受拉； 应力－应变； 试验研究

中图分类号： TU522      

文献标志码： A      

文章编号： 1005-8249 (2023) 04-0053-06

DOI : 10. 19860/j.cnki.issn1005-8249.2023.04.009

ZOU Qingyu1 , ZHOU Li1 , 3 , HU Song2 , XU Yifeng1 , YIN Chao1

( 1. College of Architecture and Urban planning , Guizhou University , Guiyang 550025 , China;

2. College of Agroforestry Engineering and Planing , Tongren University , Tongren 554300 , China;

3. Intelligent and Green Mountain Residence Engineering Research Center of Guizhou Province ,

Guiyang 550025 , China)

Abstract: To study the tensile stress-strain curve of fiber-reinforced phosphogypsum, the mass ratio of phosphogypsum powder, cement and fiber was set at 90%, 10%, and 0.2%, and 12 prism test samples were fabricated with the water-cement ratio (0.7, 0.8, 0.9) as the change parameters. Through the axial monotonic tensile test, the tensile stress-strain curve, tensile strength, peak strain, and other mechanical indexes of fiber-reinforced phosphogypsum were analyzed. The normalized curves were fitted, and the mathematical expression of the stress-strain curve was given. The research shows that the tensile stress-strain curves are nonlinear, and the lower the water-cement ratio is, the steeper the curve is; When the water-cement ratio increases from 0.7 to 0.8 and 0.9, the axial tensile strength decreases by 11.4% and 34.3% respectively; The peak tensile strain is less affected by the water-cement ratio, and the measured strain values are in the range of 31.5 με~54.8 με.

Keywords: fiber; phosphogypsum; axial tension; stress-strain; experimental investigation

∗基金项目： 国家自然科学基金资助（项目批准号： 52068007) , 贵州省基础研究计划（ 黔科合基础  [2020] 1 Y417) , 贵州大学引进人才科研基金资助项目[2019 (08) 号］。

作者简介：邹庆余  ( 1996— ) , 男 ，硕士研究生 。主要从事绿色建筑材料及其应用研究。 

通信作者：周理  ( 1983— ) , 男 ，博士 ，副教授 。主要从事绿色建筑材料及其应用研究。 

收稿日期： 2022-6-21