磷石膏基复合胶凝材料的性能优化及机理研究

doi:10.19964/j.issn.1006-4990.2021-0723

Abstract

Abstract:

Phosphogypsum was modified with cement，slag powder，fly ash and water reducer.The strength of the final phosphogypsum based composite cementitious material was twice that of undisturbed phosphogypsum，and the softening coefficient was increased from 0.5 to 0.8.There was an obvious linear relationship between the specific strength and porosity of phosphogypsum based composite cementitious materials.When the porosity was decreased，the specific strength was increased.The microstructure evolution of phosphogypsum based composite cementitious material was characterized by scanning electron microscope（SEM）.It was found that with the addition of slag powder，cement，fly ash and water reducer，the matrix changed from loose to dense；The main hydration product dihydrate gypsum changed from needle to rod or sheet，and hydrated calcium silicate（C-S-H） gel appeareds，which filled the pores in the system and connects dihydrate gypsum as a whole.The microstructure of hydration products was studied by X-ray diffraction（XRD） analysis and fourier transform infrared absorption spectroscopy（FT-IR）.The results showed that the main product in the composite system was dihydrate gypsum，but due to the reduction of available water，a small amount of phosphogypsum remained in the system without hydration.

Key words: phosphogypsum, composite cementitious materials, porosity, micro structure, hydration mechanism

CLC Number:

TQ171

ZHANG Taiyue,XIE Fan,GUO Junyuan. Study on performance optimization and mechanism of phosphogypsum based composite cementitious materials[J]. Inorganic Chemicals Industry, 2022, 54(9): 136-142.

Figures/Tables 16

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样品编号	磷石膏	矿渣粉	粉煤灰	水泥	聚羧酸系减水剂	水	缓凝剂
P	500	—	—	—	—	350	0.5
P-S	400	100	—	—	—	350	0.4
P-S-C	400	100	—	25	—	350	0.4
P-S-C-F	400	50	50	25	—	350	0.4
P-S-C-F-PCE	400	50	50	25	1.2	250	0.4

项目	化学组成质量分数/%
项目	CaO	SiO₂	Fe₂O₃	Al₂O₃	SO₃	MgO	K₂O	P₂O₅	F
磷石膏	45.28	7.76	0.54	1.14	39.94	1.17	0.21	1.70	1.7
水泥	71.09	15.27	4.74	3.22	2.51	1.57	0.81	0.08	—
矿渣粉	49.24	27.81	0.55	13.08	1.54	5.88	0.32	—	—
粉煤灰	8.56	43.63	6.96	34.46	0.85	0.78	0.99	0.51	—

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on performance optimization and mechanism of phosphogypsum based composite cementitious materials

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