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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (9): 3222-3232.DOI: 10.16552/j.cnki.issn1001-1625.2026.0384

• 资源综合利用 • 上一篇    下一篇

碳化养护对磷石膏基复合胶凝材料力学性能与耐水性的影响及机理研究

陈明胜1,2(), 杨宁1,2, 刘天乐1,2(), 郑少军1,2, 刘鹏3   

  1. 1.中国地质大学(武汉)非常规固井与特种加固实验室,武汉 430074
    2.中国地质大学(武汉)工程学院,武汉 430074
    3.贵州大学土木工程学院,贵阳 550025
  • 收稿日期:2026-04-24 修订日期:2026-05-22 出版日期:2026-09-15 发布日期:2026-10-09
  • 通信作者: 刘天乐,博士,教授。E-mail:liutianle2008@163.com
  • 作者简介:陈明胜(1997—),男,博士研究生。主要从事磷石膏固废资源化利用的研究。E-mail:chenms6625@163.com
  • 基金资助:
    国家重点研发计划(2024YFC2814304);国家自然科学基金(42072343);国家自然科学基金(42402318)

Effect and Mechanism of Carbonation Curing on Mechanical Properties and Water Resistance of Phosphogypsum-Based Composite Cementitious Materials

CHEN Mingsheng1,2(), YANG Ning1,2, LIU Tianle1,2(), ZHENG Shaojun1,2, LIU Peng3   

  1. 1.Unconventional Cementing and Special Reinforcement Laboratory,China University of Geosciences,Wuhan 430074,China
    2.Faculty of Engineering,China University of Geosciences,Wuhan 430074,China
    3.College of Civil Engineering,Guizhou University,Guiyang 550025,China
  • Received:2026-04-24 Revised:2026-05-22 Published:2026-09-15 Online:2026-10-09

摘要:

磷石膏基材料耐水性差、强度不足,限制了其规模化资源利用。本文以半水磷石膏为主要原料,复掺水泥、粉煤灰和生石灰,制备磷石膏基复合胶凝材料(PGC),研究标准、水浴和碳化养护对PGC力学性能、耐水性及微观结构的影响。结果表明:PGC在三种养护条件下的28 d抗压强度均显著高于单一磷石膏体系,其中标准养护下抗压强度最高,达到33.78 MPa;碳化养护下PGC兼具较高强度和优良耐水性,28 d 抗压强度为27.68 MPa,抗压软化系数为1.0。TG-DTG、XRD、FTIR和SEM结果表明,水泥水化、粉煤灰-石灰火山灰反应及碳化沉积协同生成水化硅酸钙(C-S-H)、AFt和CaCO3,CaCO3主要沉积于晶体间隙、凝胶孔及局部微裂隙中,并与水化产物共同改善微观结构连续性。碳化养护可有效提升PGC的强度-耐水协同性能,可为磷石膏高值化利用、CO2固封及低碳胶凝材料开发提供参考。

关键词: 磷石膏, 软化系数, 碳化养护, 抗压强度, 碳化沉积

Abstract:

Phosphogypsum-based materials have poor water resistance and insufficient strength, which limits their large-scale resource utilization. In this paper, phosphogypsum-based composite cementitious material (PGC) was constructed by using hemihydrate phosphogypsum as the main raw material, mixed with cement, fly ash and quicklime. The effects of standard, water bath and carbonation curing on the mechanical properties, water resistance and microstructure of PGC were studied. The results show that the 28 d compressive strength of PGC under three curing conditions is significantly higher than that of single phosphogypsum system, and the compressive strength under standard curing is the highest, reaching 33.78 MPa. Under carbonation curing, PGC has both high strength and excellent water resistance. The 28 d compressive strength is 27.68 MPa, the compressive softening coefficient is 1.0. The results of TGA, XRD, FTIR and SEM show that calcium silicate hydrate (C-S-H), AFt and CaCO3 are synergistically formed by cement hydration, fly ash-lime pozzolanic reaction and carbonation deposition. CaCO3 is mainly deposited in crystal gaps, gel pores and local microcracks, and improves the continuity of microstructure together with hydration products. Carbonation curing can effectively improve the strength-water resistance synergy of PGC, which can provide reference for high-value utilization of phosphogypsum, CO2 sequestration and development of low-carbon cementitious materials.

Key words: phosphogypsum, softening coefficient, carbonation curing, compressive strength, carbonation deposition

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