外掺料对磷石膏基胶凝材料力学及导热性能的影响

doi:10.19964/j.issn.1006-4990.2021-0725

Abstract

Abstract:

Application of phosphogypsum in construction industry can solve the problem of accumulation of phosphorus chemical by?products.Single factor experiment was used to study the effects of various factors on the mechanical properties and thermal insulation properties of phosphogypsum?based cementitious materials by changing the water?cement mass ratio，the content of fly ash and the content of quicklime.The physicochemical properties and morphology of phosphogypsum-based cementitious materials were analyzed by means of X-ray diffraction（XRD），X-ray fluorescence spectroscopy（XRF） and scanning electron microscopy（SEM）.The results showed that the thermal conductivity and compressive strength of phosphogypsum?based cementitious materials were negatively correlated with the water?cement mass ratio.When the water cement ratio was 0.250，the compressive strength of the cementitious material was the largest，and the thermal conductivity of the cementitious material was the smallest when the water?cement mass ratio was 0.550.Fly ash in phosphogypsum?based cementitious system not only provided cementitious performance，but also was activated by quicklime to enhance the comprehensive performance of the cementitious system.When the content of fly ash was 50%（mass fraction），the comprehensive performance of the cementitious system was the best.The adsorption effect of lime on impurities in phosphogypsum-based cementitious system was obvious.When the content of lime was more than 7%（mass fraction），the thermal insulation performance and mechanical properties of the cementitious system were obviously enhanced.

Key words: phosphogypsum, solid waste utilization, thermal conductivity, mechanical properties, material preparation

CLC Number:

TQ177

CHEN Mingsheng,LIU Peng,KONG Dewen,LI Yuan,YU Ke,HUANG Yansen,WU Ningbo,CHANG Juanjuan. Effect of external admixtures on mechanical and thermal conductivity of phosphogypsum composite cementitious materials[J]. Inorganic Chemicals Industry, 2022, 54(9): 113-118.

Figures/Tables 11

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成分		质量分数/%	成分		质量分数/%
大量	CaO	41.042	微量	Na₂O	0.048
	SO₃	54.943		K₂O	0.116
	Al₂O₃	0.381		TiO₂	0.065
	SiO₂	1.802		SrO	0.023
	P₂O₅	1.295		Cl	0.013
微量	Fe₂O₃	0.269		Y₂O₃	0.003

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Inorganic Acid-Base-Salt Committee of CIESC

Effect of external admixtures on mechanical and thermal conductivity of phosphogypsum composite cementitious materials

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