Open AccessEffect of cement and fluidized bed combustion ashes on properties of phosphogypsum composite cementitious materials
Author(s) -
Pengfei Ma,
Shuang Li,
Baojun Cheng,
Binxun Yu,
Yuxin Gao
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/636/1/012035
Subject(s) - phosphogypsum , cement , cementitious , materials science , compressive strength , softening , fluidized bed combustion , combustion , composite number , composite material , fluidized bed , portland cement , gypsum , metallurgy , waste management , chemistry , raw material , organic chemistry , engineering
The effect of fluidized bed combustion ashes (FBC) and cement by monodoping and compound doping on the mechanical properties and water resistance of phosphogypsum composite cementitious materials was studied, and the mechanism was explored by SEM. The results showed that the cement and fluidized bed combustion ashes by monodoping have a negative effect on the compressive strength of phosphogypsum, but can effectively improve its softening coefficient. When cement and fluidized bed combustion ashes mixed together, the softening coefficient increased with the increase of cement from 0 to 10%. But the softening coefficient decreased with the increase of cement from 0 to 20%, however, the compressive strength increased. Through the ANOVA analysis, the optimal dosage of cement, fluidized bed combustion ashes and phosphogypsum was obtained. Through the SEM, the hydration products covered on the surface of gypsum crystal, increased the compactness of the hardened body.