DOI: 10.1016/j.jcou.2017.01.018
Scopus记录号: 2-s2.0-85011094712
论文题名: CO2curing and fibre reinforcement for green recycling of contaminated wood into high-performance cement-bonded particleboards
作者: Wang L. ; Chen S.S. ; Tsang D.C.W. ; Poon C.-S. ; Dai J.-G.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2017
卷: 18 语种: 英语
英文关键词: Accelerated carbonation
; Basalt fibre
; CO2sequestration
; Microstructure
; Waste recycling
; Wood particleboard
Scopus关键词: Amorphous carbon
; Basalt
; Calcium carbonate
; Carbon dioxide
; Carbonation
; Cements
; Chemical analysis
; Curing
; Fibers
; Hydration
; Mercury (metal)
; Microstructure
; Moisture
; Moisture determination
; Organic chemicals
; Particle board
; Phenolic resins
; Recycling
; Reinforcement
; Scanning electron microscopy
; Sustainable development
; Waste disposal
; Wood chemicals
; Wooden construction
; X ray diffraction
; Accelerated carbonation
; Cement-bonded particleboard
; Environmentally-friendly technology
; Mercury intrusion porosimetry
; Microstructure characteristics
; Quantitative x ray diffraction
; Waste recycling
; Wood particleboards
; Wood
; Carbon Dioxide
; Carbonation
; Curing
; Microstructure
; Particle Boards
; Pollution
; Polyphenolics
; Recycling
; Wood
英文摘要: Graphical abstract: To alleviate disposal burden of contaminated wood at landfills, construction wood waste can be recycled into cement-bonded particleboards, however, their qualities are often compromised by organic extractives and preservative chemicals in wood. In contrast to traditional approaches using phenol formaldehyde resin or chloride accelerator, this study proposed the use of eco-friendly CO2curing and fibre reinforcement to accelerate carbonation and enhance physical properties of the particleboards. Cement chemistry and microstructure characteristics were evaluated by using quantitative X-ray diffraction, mercury intrusion porosimetry, and scanning electron microscopy analyses. The 24-h CO2curing significantly facilitated cement hydration (i.e., more than 63wt% amorphous cement hydrate) and accelerated Ca(OH)2transformation into CaCO3, which contributed to strength development and carbon sequestration (as high as 9.2wt%) in the particleboards. Consequently, the total pore area was reduced from 12.2 to 10.3m2g−1 and porosity from 34.8 to 29.7%. A subsequent 7-d air curing allowed cement rehydration and densified micropore structure, especially for capillary pores. As a result, mechanical strength, dimensional stability, and contaminants sequestration were enhanced to fulfil the requirement of International Standards. The results also illustrated the vital role of moisture content of particleboards in cement hydration and accelerated carbonation, for which the moisture content ranging from 16.7% to 17.9% was considered optimal. The addition of grid basalt fibre (0.5% by wood volume) enhanced the fracture energy of the particleboards by 6.5 times. This study presents a low-carbon and environmentally-friendly technology to upcycle construction wood waste into value-added materials in a sustainable way. © 2017 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52759
Appears in Collections: 影响、适应和脆弱性
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Recommended Citation:
Wang L.,Chen S.S.,Tsang D.C.W.,et al. CO2curing and fibre reinforcement for green recycling of contaminated wood into high-performance cement-bonded particleboards[J]. Journal of CO2 Utilization,2017-01-01,18