Design optimization and characterization of a green product by combined geopolymerization of sewage sludge ash with metakaolin

doi:10.1016/j.clay.2021.106271

	Design optimization and characterization of a green product by combined geopolymerization of sewage sludge ash with metakaolin
	Chen, Zhen 3; Poon, Chi Sun 1,2; Li, Jiang-Shan 3; Xue, Qiang 2,3
刊名	APPLIED CLAY SCIENCE
	2021-11-15
卷号	214 页码:10
关键词	Geopolymer paste Sewage sludge ash Metakaolin Molar ratio Initial curing temperature
ISSN号	0169-1317
DOI	10.1016/j.clay.2021.106271
英文摘要	This study aimed at developing sewage sludge ash (SSA) as a green binding material through geopolymerization for saving natural resources and reducing problems with the waste disposal. Geopolymer pastes based on a precursor comprising 25 wt% of metakaolin (MK) and 75 wt% of SSA were synthesized using the dry-mixed method. Compressive strength tests of the specimens revealed that geopolymers produced from mixes with a Na2O/SiO2 molar ratio of 0.30 and a SiO2/Al2O3 molar ratio in the range of 3.00 to 3.60 achieved the highest compressive strength after 28 days of curing, regardless of temperature. The microstructural analyses showed the formation of N-A-S-H gels in the specimens. The initial curing temperature had a significant influence on the compressive strength of the geopolymers. Specimens initially cured at 40 degrees C for 7 days and then stored at room temperature showed progressive gain in compressive strength with time. However, raising the initial curing temperature from 40 degrees C to 60 degrees C resulted in the formation of cracks in the matrix and new mineral of zeolite P (Na) which caused a notable loss of late-age strength. Leaching toxicity tests showed that the concentrations of heavy metal(loid)s in leachates did not exceed the specified limits.
资助项目	Hong Kong Polytechnic University ; Funds for International Cooperation and Exchange of the National Natural Science Foundation of China[51861165104]
WOS研究方向	Chemistry ; Materials Science ; Mineralogy
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000702913100003
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/28544]
专题	中科院武汉岩土力学所
通讯作者	Poon, Chi Sun; Li, Jiang-Shan
作者单位	1.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China 2.IRSM CAS, HK PolyU Joint Lab Solid Waste Sci, Wuhan 430071, Peoples R China 3.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Chen, Zhen,Poon, Chi Sun,Li, Jiang-Shan,et al. Design optimization and characterization of a green product by combined geopolymerization of sewage sludge ash with metakaolin[J]. APPLIED CLAY SCIENCE,2021,214:10.
APA	Chen, Zhen,Poon, Chi Sun,Li, Jiang-Shan,&Xue, Qiang.(2021).Design optimization and characterization of a green product by combined geopolymerization of sewage sludge ash with metakaolin.APPLIED CLAY SCIENCE,214,10.
MLA	Chen, Zhen,et al."Design optimization and characterization of a green product by combined geopolymerization of sewage sludge ash with metakaolin".APPLIED CLAY SCIENCE 214(2021):10.