Inorganic Chemicals Industry >
Study on performance optimization and mechanism of phosphogypsum based composite cementitious materials
Received date: 2022-01-05
Online published: 2022-09-22
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.
Taiyue ZHANG , Fan XIE , Junyuan GUO . Study on performance optimization and mechanism of phosphogypsum based composite cementitious materials[J]. Inorganic Chemicals Industry, 2022 , 54(9) : 136 -142 . DOI: 10.19964/j.issn.1006-4990.2021-0723
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