Carbon-negative cement-bonded biochar particleboards

作     者：Liang Chen Yuying Zhang Claudia Labianca Lei Wang Shaoqin Ruan Chi Sun Poon Yong Sik Ok Daniel C.W.Tsang 

作者机构：Department of Civil and Environmental EngineeringThe Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina State Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou 310027China College of Civil Engineering and ArchitectureZhejiang UniversityHangzhou 310058China Research Centre for Resources Engineering Towards Carbon NeutralityThe Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Korea Biochar Research CenterAPRU Sustainable Waste Management Program&Division of Environmental Science and Ecological EngineeringKorea UniversitySeoul 02841Korea 

出 版 物：《Biochar》 (生物炭（英文）)

年 卷 期：2022年第4卷第1期

页      面：219-227页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：the Hong Kong Green Tech Fund(GTF202020153) Alexander von Humboldt Foundation,Germany(AvH),and Open Project of State Key Laboratory of Clean Energy Utilization,Zhejiang University(ZJUCEU2022001) 

主　　题：Biochar-cement composite Carbon neutrality Wood waste biochar Magnesium oxysulfate cement Climate-positive construction materials 

摘      要：Biochar from bio-waste pyrolysis presents excellent CO_(2) sequestration *** study innovated the design of cement-bonded particleboards utilizing a substantial amount of 50-70 wt.%pre-soaked biochar to render the products *** investigated the roles of biochar in magnesium oxysulfate cement(MOSC)system and demonstrated good mechanical and functional properties of biochar cement *** the presence of biochar,the amounts of hydration products were enriched in the cement systems as illustrated by the thermogravi-metric analyses(TGA)and X-ray diffraction(XRD).We further incorporated supplementary cementitious materials(SCMs)and generated 5 Mg(OH)_(2)⋅MgSO_(4)·7H_(2)O(5-1-7)phase in the MOSC *** a result,our designs of biochar particleboards satisfied the standard requirements for flexural strength(5.5 MPa)and thickness swelling(2%).Moreover,our biochar particleboards presented a low thermal conductivity as the biochar pores disrupted thermal bridging within *** illustrated that the high dosage ratio of biochar could significantly offset the CO_(2) emissions of the particleboards(i.e.,carbon-negative)via life cycle *** economic profits could also be accomplished for the biochar *** instance,the 50BC-MOSC bonded particleboard(with 50 wt.%pre-soaked biochar as aggregate,50 wt.%MOSC as binder)with promising mechanical properties could store 137 kg CO_(2) tonne^(−1) and yield an overall economic profit of 92 to 116 USD m^(−3) depending on the carbon prices in different *** summary,our new designs of carbon-negative biochar particleboards could curtail carbon emissions in the construction materials and promote the realization of carbon neutrality and circular economy.