高掺量磷石膏胶凝材料硬化体制备及其性能调节

doi:10.16552/j.cnki.issn1001-1625.2025.0049

摘要/Abstract

摘要： 为制备高强的高掺量磷石膏胶凝材料,本文研究了成型压力、钙硅铝比及碱激发剂掺量等工艺参数对高掺量磷石膏胶凝材料硬化体性能的影响规律,并基于响应面法中的Box-Behnken设计,分析了各影响因子对抗压强度的交互作用机制。此外,采用X射线衍射、扫描电子显微镜对硬化体进行微观结构分析。结果表明:磷石膏胶凝材料硬化体的长期性能随成型压力、钙硅铝比和碱激发剂掺量的增大均呈先增大后减小的趋势;通过响应面模型分析,影响因子对强度发展的交互作用从强到弱依次是成型压力、钙硅铝比、碱激发剂掺量;当成型压力为60 MPa、钙硅铝比为1.1(摩尔比)、碱激发剂掺量为0.5‰(质量分数)时,可制备出抗压强度超过65 MPa的高掺量磷石膏胶凝材料硬化体,此时结晶良好的针棒状钙矾石填充磷石膏颗粒之间的空隙,水化硅酸钙(C-S-H)凝胶包裹胶结磷石膏颗粒和钙矾石晶体,形成致密结构。

关键词: 高掺量磷石膏, 高抗压强度, 力学性能, 响应面法, 微观结构

Abstract: In order to prepare high-strength and high content phosphogypsum cementitious materials, the effects of shaping pressure, calcium-silicon-aluminum ratio and alkali activator content on the properties of high content phosphogypsum cementitious materials hardened body were studied. Based on the Box-Behnken design in the response surface method, the interaction mechanism of each influencing factor on the compressive strength was analyzed. In addition, the microstructure of the hardened body was analyzed by X-ray diffraction and scanning electron microscopy. The results show that the long-term performance of the hardened body of phosphogypsum cementitious materials increases first and then decreases with the increase of shaping pressure, calcium-silicon-aluminum ratio and alkali activator content. Through the response surface model analysis, the interaction effect of the influencing factors on the strength development from strong to weak is the shaping pressure, calcium-silicon-aluminum ratio, alkali activator content. When the shaping pressure is 60 MPa, the calcium-silicon-aluminum ratio is 1.1(molar ratio), and the alkali activator content is 0.5‰ (mass fraction), the hardened body of high content phosphogypsum cementitious material with compressive strength exceeding 65 MPa can be prepared. The well-crystallized needle-like ettringite fills the gap between the phosphogypsum particles, and the calcium silicate hydrate (C-S-H) gel wraps the cemented phosphogypsum particles and ettringite crystals to form a dense structure.

Key words: high content phosphogypsum, high compressive strength, mechanical property, response surface method, microstructure

中图分类号:

TU526

李义胜, 吕伟, 吴赤球, 余正康, 何静, 水中和. 高掺量磷石膏胶凝材料硬化体制备及其性能调节[J]. 硅酸盐通报, 2025, 44(8): 2944-2954.

LI Yisheng, LYU Wei, WU Chiqiu, YU Zhengkang, HE Jing, SHUI Zhonghe. Hardened Body Preparation and Performance Adjustment of High Content Phosphogypsum Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(8): 2944-2954.

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