大掺量磷石膏矿渣水泥的水化历程与长期强度研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (12): 4408-4415.

大掺量磷石膏矿渣水泥的水化历程与长期强度研究

廖宜顺^1,2,3, 汪凯¹, 李豪¹

1.武汉科技大学城市建设学院,武汉 430065;
2.武汉科技大学高性能工程结构研究院,武汉 430065;
3.城市更新湖北省工程研究中心,武汉 430065

收稿日期:2023-07-06 修订日期:2023-08-31 出版日期:2023-12-15 发布日期:2023-12-12
作者简介:廖宜顺(1984—),男,博士,副教授。主要从事先进水泥基材料方向的研究。E-mail:liaoyishun@wust.edu.cn
基金资助:
国家自然科学基金(51608402) ;湖北省建设科技计划项目(厅头〔2021〕2075号-38)

Hydration Process and Long-Term Strength of Gypsum Slag Cement with High Content of Phosphogypsum

LIAO Yishun^1,2,3, WANG Kai¹, LI Hao¹

1. School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China;
2. Institute of High-Performance Engineering Structure, Wuhan University of Science and Technology, Wuhan 430065, China;
3. Hubei Provincial Engineering Research Center of Urban Regeneration, Wuhan 430065, China

Received:2023-07-06 Revised:2023-08-31 Online:2023-12-15 Published:2023-12-12

摘要/Abstract

摘要： 采用大掺量磷石膏、粒化高炉矿渣和熟石灰制备石膏矿渣水泥,通过水化热、化学收缩、孔溶液pH值和抗压强度试验,并结合XRD和SEM-EDS测试,探究磷石膏掺量对石膏矿渣水泥的水化历程与长期强度的影响规律。结果表明,当磷石膏的掺量从40%增大到70%(质量分数,下同)时,水泥浆体的第三放热峰峰值逐渐减小,14 d化学收缩从0.066 mL·g^-1增大到0.193 mL·g^-1,早期(0~1 d)化学收缩速率明显增大,孔溶液pH值在28 d龄期内趋于稳定,且与28 d龄期相比,90 d龄期试件的抗压强度提高了12.3%~27.8%。XRD和SEM-EDS分析表明,水泥浆体中主要包含二水石膏、石英、钙矾石和C-S-H凝胶等物质。28 d龄期时,随着磷石膏掺量的增大,钙矾石的生成量从7.48%减小到2.84%,C-S-H凝胶的钙硅比(摩尔比)从1.08增大到2.24。

关键词: 磷石膏, 石膏矿渣水泥, 粒化高炉矿渣, 水化热, 化学收缩, 水化产物, 抗压强度

Abstract: A large amount of phosphogypsum, ground granulated blast-furnace slag and slaked lime were employed to prepare the gypsum slag cement. The effect of phosphogypsum content on the hydration process and long-term strength of gypsum slag cement was investigated through hydration heat, chemical shrinkage, pH value of pore solution and compressive strength tests, combined with XRD and SEM-EDS. The results show that the third peak of heat release curves of cement pastes gradually decreases when the phosphogypsum content increases from 40% to 70% (mass fraction, the same below). The chemical shrinkage at 14 d increases from 0.066 mL·g^-1 to 0.193 mL·g^-1, and chemical shrinkage rate significantly increases during the early hydration stage (0~1 d). The pH value of pore solution tends to stabilize within 28 d. Compared with 28 d compressive strength, the 90 d compressive strength is enhanced by 12.3%~27.8%. XRD and SEM-EDS reveales that the cement pastes mainly consists of gypsum, quartz, ettringite and C-S-H gel. At the age of 28 d, the ettringite content decreases from 7.48% to 2.84%, and the Ca/Si ratio (molar ratio) of C-S-H gel increases from 1.08 to 2.24 with the increase of phosphogypsum.

Key words: phosphogypsum, gypsum slag cement, ground granulated blast-furnace slag, hydration heat, chemical shrinkage, hydration product, compressive strength

中图分类号:

TQ172

廖宜顺, 汪凯, 李豪. 大掺量磷石膏矿渣水泥的水化历程与长期强度研究[J]. 硅酸盐通报, 2023, 42(12): 4408-4415.

LIAO Yishun, WANG Kai, LI Hao. Hydration Process and Long-Term Strength of Gypsum Slag Cement with High Content of Phosphogypsum[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(12): 4408-4415.

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