The roles of biochar as green admixture for sediment-based construction products

被引：166

作者：

Wang, Lei ^{[1
]}

Chen, Liang ^{[1
]}

Tsang, Daniel C. W. ^{[1
]}

Kua, Ham Wei ^{[2
]}

Yang, Jian ^{[3
]}

Ok, Yong Sik ^{[4
,5
]}

Ding, Shiming ^{[6
]}

Hou, Deyi ^{[7
]}

Poon, Chi Sun ^{[1
]}

机构：

[1] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China

[2] Natl Univ Singapore, Sch Design & Environm, Dept Bldg, 4 Architectural Dr, Singapore S117566, Singapore

[3] Shanghai Jiao Tong Univ, Sch Naval Architecture Ocean & Civil Engn, State Key Lab Ocean Engn, Shanghai, Peoples R China

[4] Korea Univ, Korea Biochar Res Ctr, OJERI, Seoul 02841, South Korea

[5] Korea Univ, Div Environm Sci & Ecol Engn, Seoul 02841, South Korea

[6] Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China

[7] Tsinghua Univ, Sch Environm, Beijing 100084, Peoples R China

来源：

CEMENT & CONCRETE COMPOSITES | 2019年 / 104卷

关键词：

Microstructure analysis; Eco-friendly construction materials; Engineered biochar; Waste vaorization/recycling; Green/sustainable remediation; Stabilization/solidification; ARSENIC-CONTAINING SOIL; CONTAMINATED SEDIMENT; DREDGED SEDIMENT; FLY-ASH; CEMENT; WASTE; STABILIZATION/SOLIDIFICATION; REMEDIATION; SLUDGE; CARBON;

D O I：

10.1016/j.cemconcomp.2019.103348

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Routine navigational dredging generates huge quantities of marine sediment, posing significant environmental and economic burden. This research intended to explore the efficacy of wood waste biochar as a green admixture and assess the influence of different physico-chemical properties of dredged sediments on the mechanical performance of cement-based sediment products. X-ray diffraction and porosimetry analysis reflected that particle size distribution of sediments determined the pore structure formation and strength development. Thermal and calorimetry analyses showed that biochar incorporation slightly enhanced the cement hydration reaction, while its relatively large and brittle particles induced microcracks and weakened the strength of sediment products. Nevertheless, biochar addition enhanced immobilization of potentially toxic elements and organic contaminants, rendering the sediment products more environmentally acceptable. Hence, the innovative approach of this study can recycle dredged sediment and waste wood biochar to produce eco-friendly construction materials such as fill material and paving blocks.

引用

页数：9

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