生物炭对磷建筑石膏性能影响研究

doi:10.16552/j.cnki.issn1001-1625.2025.0526

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (12): 4469-4479.DOI: 10.16552/j.cnki.issn1001-1625.2025.0526

生物炭对磷建筑石膏性能影响研究

王魏¹, 陈雪梅^1,2, 邓祥海¹, 罗利³, 吴启红¹, 肖林一¹, 康河川¹

1.成都大学建筑与土木工程学院,成都 610106;
2.四川省城市固废能源与建材转化利用技术工程研究中心,成都 610106;
3.中国五冶集团有限公司,成都 610063

收稿日期:2025-05-26 修订日期:2025-08-07 出版日期:2025-12-15 发布日期:2025-12-30
通信作者: 陈雪梅,博士,副研究员。E-mail:chenxuemei424@foxmail.com
作者简介:王魏(2001—),男,硕士研究生。主要从事低碳建材方面的研究。E-mail:wangwei20010810@163.com
基金资助:
成都大学大学生创新训练计划孵化培育项目(CDUCX2025374);东南大学江苏省土木工程材料重点实验室开放研究基金项目(202210);四川省国际科技创新合作/港澳台科技创新合作项目(2025YFHZ0098)

Effect of Biochar on Performance of Phosphorus Building Gypsum

WANG Wei¹, CHEN Xuemei^1,2, DENG Xianghai¹, LUO Li³, WU Qihong¹, XIAO Linyi¹, KANG Hechuan¹

1. School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China;
2. Sichuan Provincial Engineering Research Center of City Solid Waste Energy and Building Materials Conversion and Utilization Technology, Chengdu 610106, China;
3. China MCC5 Group Co., Ltd., Chengdu 610063, China

Received:2025-05-26 Revised:2025-08-07 Published:2025-12-15 Online:2025-12-30

摘要/Abstract

摘要： 为探究生物炭在磷石膏基胶凝材料中的应用潜力,本文采用玉米秸秆生物炭(CSB)和竹生物炭(BB)分别在酸、碱性条件下对磷建筑石膏改性,通过流动度、凝结时间、水化热、强度、吸水率和软化系数测试,结合X射线衍射(XRD)和扫描电子显微镜(SEM)分析,研究了生物炭对磷建筑石膏工作性能、力学性能及耐水性能的影响。结果表明,生物炭显著降低了磷建筑石膏的流动度,生物炭掺量为5.0%(质量分数,下同)时,酸性条件下CSB和BB使流动度分别降低8.3%和7.8%,碱性条件下流动度降幅分别增至13.7%和12.4%。生物炭改变了磷建筑石膏的水化放热进程,进而影响了磷建筑石膏的凝结时间,生物炭掺量为5.0%时,酸性条件下CSB和BB使凝结时间分别延长11和9 min,碱性条件下CSB使凝结时间延长12 min,而BB使凝结时间缩短10 min。XRD和SEM分析表明,生物炭未改变磷建筑石膏水化产物的组成,但降低了CaSO₄·2H₂O晶体的长径比,进而影响了磷建筑石膏的性能发展。低掺量(≤1.0%)生物炭在酸性条件下对磷建筑石膏抗折、抗压强度和耐水性能的影响不显著,而在碱性条件下提高了磷建筑石膏的性能,其中1.0%掺量的CSB使抗压强度提升7.1%并改善耐水性能,但高掺量(>1.0%)生物炭导致磷建筑石膏的抗折、抗压强度和耐水性能显著下降。

关键词: 磷建筑石膏, 生物炭, 凝结时间, 水化进程, 水化产物, 晶体形貌

Abstract: To investigate the application potential of biochar in phosphogypsum-based cementitious materials, this study used corn stover biochar (CSB) and bamboo biochar (BB) to modify phosphorus building gypsum (PBG) under acidic and alkaline condition, respectively. The effect of biochar on the workability, mechanical properties and water resistance of PBG was examined through tests on fluidity, setting time, hydration heat, strength, water absorption rate and softening coefficient, combined with X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses. The results show that biochar significantly reduces the fluidity of PBG. When the biochar content is 5.0% (mass fraction, the same below), CSB and BB reduce the fluidity by 8.3% and 7.8% under acidic condition, respectively, and decrease the fluidity by 13.7% and 12.4% under alkaline condition, respectively. Biochar changes the hydration heat release process of PGB, thereby influencing setting time of PBG. When the biochar content is 5.0%, CSB and BB extend the setting time by 11 and 9 min under acidic condition, respectively, and CSB extends the setting time by 12 min and BB shortens setting time by 10 min under alkaline condition. XRD and SEM analyses reveal that biochar does not change the composition of hydration products of PBG but reduces the aspect ratio of CaSO₄·2H₂O crystals, thereby influencing the performance development of PBG. When the content of biochar is low (≤1.0%), CSB and BB have negligible effects on the flexural strength, compressive strength and water resistance of PBG under acidic condition, but improve the performance of PBG under alkaline condition. Among them, the compressive strength of PBG with 1.0% CSB content increases by 7.1%, and the water resistance is also improved. However, the flexural strength, compressive strength and water resistance of PBG significantly reduce when the content of biochar is high (>1.0%).

Key words: phosphorus building gypsum, biochar, setting time, hydration process, hydration product, crystal morphology

中图分类号:

TU526

王魏, 陈雪梅, 邓祥海, 罗利, 吴启红, 肖林一, 康河川. 生物炭对磷建筑石膏性能影响研究[J]. 硅酸盐通报, 2025, 44(12): 4469-4479.

WANG Wei, CHEN Xuemei, DENG Xianghai, LUO Li, WU Qihong, XIAO Linyi, KANG Hechuan. Effect of Biochar on Performance of Phosphorus Building Gypsum[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(12): 4469-4479.

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生物炭对磷建筑石膏性能影响研究

Effect of Biochar on Performance of Phosphorus Building Gypsum

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