镁铝水滑石对高铁低钙硅酸盐水泥性能的影响

doi:10.19964/j.issn.1006-4990.2023-0339

Abstract

Abstract:

MgAl-layered double hydroxides（MgAl-LDH） were synthesized using a separate nucleation and aging steps（SNAS） method，and high-iron low-calcium portland cement（iron phase mass fraction of 19.6%） was prepared by limestone，standstone and iron ore powder.The effects of MgAl-LDH content on the chloride curing ability，mechanical properties and microstructure of high-iron low-calcium cement were studied by X-ray diffraction（XRD），thermogravimetric（TG），scanning electron microscopy（SEM），and chemical analysis methods.The results showed that MgAl-LDH could improve the mechanical properties and chemical curing ability of chloride ions.When MgAl-LDH content was 3%（mass fraction），compared with the blank group，the chloride ion curing rate at 7 d was increased by 46.4%，and the compressive strength at 3，7 d and 28 d was increased by 27.5%，34.6% and 17.1%，respectively.The microscopic tests showed that MgAl-LDH could promote the early hydration of high-iron low-calcium cement to generate more hydration products，and promote the densification of cement structure to a certain extent.And it could promote the reaction of hydration products and chloride ions to form Friedel's salt，and improve the chemical curing amount of chloride ions.

Key words: MgAl-LDH, high-iron low-calcium cement, chloride bingding, mechanical properties, Friedel′s salt

CLC Number:

TQ172

LI Keke, XUE Jiangwei, WANG Luwei, GUAN Xuemao. Effect of MgAl-layered double hydroxides on properties of high-iron low-calcium portland cement[J]. Inorganic Chemicals Industry, 2024, 56(4): 57-63.

Figures/Tables 12

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原料	烧失量	w（SiO₂）	w（Al₂O₃）	w（Fe₂O₃）	w（CaO）	w（MgO）
石灰石	38.48	6.60	3.71	2.65	47.42	1.10
砂岩	1.81	90.07	4.04	2.59	1.07	0.41
铁矿粉	9.37	59.24	2.66	26.24	1.88	0.49

组别	m（镁铝水滑石）/g	m（高铁低钙水泥）/g	m（水）/g
LH₀	0.00	180	72.00
LH₁	1.80	180	72.72
LH₂	3.60	180	73.44
LH₃	5.40	180	74.16
LH₄	7.20	180	74.88

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Effect of MgAl-layered double hydroxides on properties of high-iron low-calcium portland cement

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