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

doi:10.16552/j.cnki.issn1001-1625.2025.1086

Abstract

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

CLC Number:

TU528

SU Hui, ZHANG Linkang, BAI Yanjie, LYU Jiaxin, ZHANG Xin, NAN Bowen, PI Haojun. Mechanism of FeSO₄·H₂O Synergistic with DTPA Modified Magnesium Oxychloride Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(5): 1491-1500.

Figures/Tables 14

Table 1 Main performance indicators of DTPA

Item	pH value （25 ℃）	Purity/%	Chelation value/（mg CaCO₃·g^-1）
DTPA	2.1~2.5	≥99.0	≥252

Fig.1 SEM image of DTPA

Fig.2 SEM image of FeSO4·H2O

Table 2 Mix ratio of MOC

Sample No.	Mass/g
Sample No.	MgO	MgCl₂·6H₂O	DTPA	FeSO₄·H₂O	H₂O
Control	1 000.00	423.70	0	0	375.14
F1	1 000.00	423.70	0	10.00	375.14
F2	1 000.00	423.70	0	20.00	375.14
D1	1 000.00	423.70	10.00	0	375.14
D1F1	1 000.00	423.70	10.00	10.00	375.14
D1F2	1 000.00	423.70	10.00	20.00	375.14
D2	1 000.00	423.70	20.00	0	375.14
D2F1	1 000.00	423.70	20.00	10.00	375.14
D2F2	1 000.00	423.70	20.00	20.00	375.14

Fig.3 Setting time of different MOC composites

Fig.4 Compressive strength of MOC under different amounts of FeSO4·H2O

Fig.5 Compressive strength of MOC under different amounts of DTPA

Fig.6 Compressive strength of different MOC composites

Fig.7 Softening coefficient of different MOC composites

Fig.8 Pore size distribution curves of different MOC composites

Fig.9 Porosity of different MOC composites

Fig.10 SEM images of MOC before and after soaking

Fig.11 XRD patterns of different MOC composites before and after soaking

Fig.12 Phase content of different MOC composites before and after soaking

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

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