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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (5): 1491-1500.DOI: 10.16552/j.cnki.issn1001-1625.2025.1086

• 水泥混凝土 • 上一篇    下一篇

FeSO4·H2O协同DTPA改性氯氧镁水泥的作用机理

宿辉1,2(), 张林康1,2, 白延杰1,2(), 吕佳鑫1,2, 张鑫1,2, 南博文1,2, 皮浩军1,2   

  1. 1.河北工程大学水利水电学院,邯郸 056038
    2.河北工程大学河北省智慧水利重点实验室,邯郸 056038
  • 收稿日期:2025-11-07 修订日期:2026-01-30 出版日期:2026-05-15 发布日期:2026-06-10
  • 通信作者: 白延杰,博士。E-mail:baiyanjie@hebeu.edu.cn
  • 作者简介:宿 辉(1972—),男,博士,教授。主要从事水工结构和水工材料方面的研究。E-mail:suh-26@163.com
  • 基金资助:
    河北省自然科学基金(E202402005);河北省自然科学基金(E2020402087);邯郸市科学技术研究与发展计划(23422903054)

Mechanism of FeSO4·H2O Synergistic with DTPA Modified Magnesium Oxychloride Cement

SU Hui1,2(), ZHANG Linkang1,2, BAI Yanjie1,2(), LYU Jiaxin1,2, ZHANG Xin1,2, NAN Bowen1,2, PI Haojun1,2   

  1. 1.School of Water Resources and Hydropower,Hebei University of Engineering,Handan 056038,China
    2.Hebei Key Laboratory of Intelligent Water Resources,Hebei University of Engineering,Handan 056038,China
  • Received:2025-11-07 Revised:2026-01-30 Published:2026-05-15 Online:2026-06-10

摘要:

本研究探讨了一水硫酸亚铁(FeSO4·H2O)和二乙烯三胺五乙酸(DTPA)对氯氧镁水泥(MOC)凝结时间、力学性能、耐水性能及微观结构的影响,并揭示FeSO4·H2O与DTPA对MOC的耐水提升机理。FeSO4·H2O与DTPA均按照0%~2%(质量分数)的不同比例加入MOC中。结果表明:当复掺2%FeSO4·H2O和2%DTPA时,MOC性能得到显著优化,初凝时间和终凝时间延长至339和374 min,分别较对照组(未掺FeSO4·H2O和DTPA)提高120%和81%,同时,7 d软化系数提升至0.9,较对照组提高164%,28 d抗压强度达到130 MPa,较MOC组提升76%,孔隙率也显著降低。这归因于DTPA的羧基结构螯合Mg2+,为MOC体系中的Mg2+提供了活性位点,使5Mg(OH)2·MgCl2·8H2O(5·1·8相)晶体排列更为紧密,结构更加密实,同时FeSO4·H2O形成的凝胶状5·1·8相晶体可填充晶体间的微孔隙,从而显著提高MOC的耐水性能。

关键词: 氯氧镁水泥, 二乙烯三胺五乙酸, 一水硫酸亚铁, 耐水性, 微观结构

Abstract:

In this study, the effects of ferrous sulfate monohydrate (FeSO4·H2O) and diethylene triamine pentaacetic acid (DTPA) on setting time, mechanical properties, water resistance and microstructure of magnesium oxychloride cement (MOC) were investigated. The mechanism of water resistance improvement of MOC by FeSO4 ·H2O and DTPA was revealed. FeSO4·H2O and DTPA were added to MOC in different proportion from 0% to 2% (mass fraction). The results show that when 2% FeSO4·H2O and 2% DTPA are added, the performance of MOC is significantly optimized. The initial setting time and final setting time are extended to 339 and 374 min, respectively, which are 120% and 81% higher than those of the control group (without FeSO4·H2O and DTPA). At the same time, the 7 d softening coefficient is increased to 0.9, which is 164% higher than that of the MOC group. The 28 d compressive strength reaches 130 MPa, which is 76% higher than that of the group control, and the porosity is also significantly reduced. This is attributed to the fact that the carboxyl structure of DTPA chelates Mg2+, which provides the active site for Mg2+ in the MOC system, so that the 5Mg(OH)2·MgCl2·8H2O (5·1·8 phase) crystals are arranged more closely and the structure is denser. At the same time, the gel-like 5·1·8 phase crystals are formed to fill the micropores between the crystals, thus significantly improving the water resistance of MOC.

Key words: magnesium oxychloride cement, diethylene triamine pentaacetic acid, ferrous sulfate monohydrate, water resistance, microstructure

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