碳化作用对镁质胶凝材料微观结构演变过程的影响

doi:10.19964/j.issn.1006-4990.2021-0546

Abstract

Abstract:

To reveal the effect of carbonization on the evolution process of the microstructure of magnesium oxychloride cement，scanning electron microscope（SEM），X-ray diffraction（XRD） and pressure testing machines were used to analyze the pure slurry and roof beam of magnesium oxychloride cement which were cured for 5 years and 30 years in the indoor environment，respectively.The results showed that carbonization exhibited an obvious influence on the microscopic morphology and phase composition of magnesium oxychloride cement.The CO₂ in the air penetrated into magnesium oxychloride cement from the surface to the inside，resulting in the change of the microscopic morphology and phase composition of magnesium oxychloride cement.The morphology of magnesium oxychloride cement was transformed mainly from needle，porous to block shape，meanwhile its phase composition also changed from 5·1·8［5Mg（OH）₂·MgCl₂·8H₂O］ to 2·1·1·6［2MgCO₃·Mg（OH）₂·MgCl₂·6H₂O］ phase，and finally to the stable hydromagnesite and magnesite.Owing to carbonization，the compressive strength of magnesium oxychloride cement cured for 5 years decreased by 22.1 MPa compared with that maintained for 1 year.Therefore，it was necessary to use an isolation method to treat magnesium oxychloride cement to reduce carbonization and extend its service life.

Key words: magnesium oxychloride cement, carbonation, microscopic morphology, phase composition

CLC Number:

TQ132.2

CHANG Chenggong,WEN Jing,DONG Jinmei,ZHENG Weixin,YAN Fengyun,XIAO Xueying. Effect of carbonization on evolution process of microstructure of magnesium oxychloride cement[J]. Inorganic Chemicals Industry, 2022, 54(6): 61-65.

Figures/Tables 9

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化学成分	质量分数/%	化学成分	质量分数/%
MgCl₂	44.90	KCl	0.01
NaCl	0.13	CaCl₂	0.03
MgSO₄	0.06	水不溶物	0.27

化学成分	质量分数/%	化学成分	质量分数/%
MgO	69.52	游离CaO	0.38
MgCO₃	19.80	酸不溶物	8.41
CaCO₃	1.34

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Inorganic Acid-Base-Salt Committee of CIESC

Effect of carbonization on evolution process of microstructure of magnesium oxychloride cement

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