| 摘要: |
| 通过设置不同陈化条件，研究陈化对建筑石膏力学性能及微观结构的影响机理.结果表明：随着陈化时间的增加，建筑石膏的标准稠度需水量先减少后增加，2 h强度先增加后减少；相对湿度越大，最佳陈化时间越短；在建筑石膏的陈化过程中，无水石膏吸水生成半水石膏，表面的微裂纹因吸水生成二水石膏晶体的填充作用而逐渐自愈合，孔隙率下降，从而提高了力学性能；过了最佳陈化阶段之后，二水石膏继续生长导致石膏性能逐渐下降. |
| 关键词: 建筑石膏 陈化 力学性能 微裂纹 自愈合 |
| DOI：10.3969/j.issn.1007-9629.2023.12.002 |
| 分类号:TU526 |
| 基金项目:河南省重大公益专项项目（201300311000） |
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| Effect of Aging on the Mechanical Properties and Microscopic Structure of Building Gypsum |
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ZHU Jianping, ZHANG Sujuan, WANG Zuolin, GUAN Xuemao, ZHANG Wenyan
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School of Materials Science and Engineering， Henan Polytechnic University， Jiaozuo 454003， China
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| Abstract: |
| By setting different aging conditions， the effect mechanism of aging on the mechanical properties and microscopic structure of building gypsum was investigated. The results show that with the increase of aging time， the water requirement for the standard consistency of building gypsum decreases first and then increases， while the 2 h strength increases first and then decreases. The higher the relative humidity， the shorter the optimal aging time. During the aging process of building gypsum， anhydrous gypsum absorbs water to generate hemihydrate gypsum， and the microcracks on the surface gradually self-heal due to the filling effect of dihydrate gypsum crystals generated by water absorption， and the porosity decreases， thus improving the mechanical properties. After the optimal aging stage， dihydrate gypsum continues to grow with the result that gypsum properties gradually decline. |
| Key words: building gypsum aging mechanical property microcrack self-heal |
