TY - JOUR
TI - Effects of high salinity wastewater on the properties of coal gasification residue-based cementitious material
AU - Wu Feng
AU - Li Hui
JN - Thermal Science
PY - 2021
VL - 25
IS - 6
SP - 4161
EP - 4169
PT - Article
AB - High salinity wastewater and coal gasification residue are the by-products  which need to be utilized as resources for the sustainable development of  coal-to-chemicals technology. Using coal gasification residue as the main  raw material, supplemented with 10% Portland cement, and high salinity  wastewater as the mixing water instead of tap water to prepare cementitious  materials. The XRD, TG-DTG, FTIR, SEM, and MIP were used to analyze the  influence mechanism of high salinity wastewater on the properties of  cementitious materials. The results show that high salinity wastewater was  beneficial to the strength development of the cementitious material. When  25% high salinity mastewater was used instead of tap water, the enhancing  rates of compressive strength was 294%, 177%, and 186% curing at 3, 7, and  28 days. This is main due to the sulfate and chloride in the high salinity  wastewater can promote the formation of C-S-H gels, Friedel's, salts and  C-A-S-H gels in the hydration process of pastes, which can promote the  densification of structure. The pores distribution and structure were  optimized, increasing the proportion of capillary pores and decreasing  macropore to promote the micro-structure more dense. This study can provide  a new idea for the comprehensive utilization of industrial waste and achieve  the purpose of "waste control by waste".