不同龄期生物炭混凝土力学性能试验研究  

EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF BIOCHAR CONCRETE AT DIFFERENT AGES

作　　者：李国东[1] 赵启轩 LI Guodong;ZHAO Qixuan(School of Civil and Transportation Engineering,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学土木与交通学院,哈尔滨150040

出　　处：《低温建筑技术》2024年第3期22-27,共6页Low Temperature Architecture Technology

基　　金：黑龙江省自然科学基金项目(LH2020E009)。

摘　　要：将生物炭用于混凝土材料可改善其力学性能,实现固碳的同时丰富了生物质材料固废利用的途径。为研究不同龄期下椰壳、玉米秸秆、稻壳3种生物炭混凝土的工作性能与力学性能,将它以不同质量百分比替代水泥制备生物炭混凝土,对生物碳混凝土的塌落度、基本力学性能展开试验研究。采用SEM和XRD观察生物炭混凝土微观结构与水化产物。结果表明微观结构上生物炭促进了混凝土中水化硅酸钙的生成,水化产物间搭接密实,填充内部孔隙,增加密实程度,进而提升混凝土的宏观力学性能;生物炭可使混凝土7、14 d早期强度显著提升,早期抗压强度最高可提升19.7%,劈裂抗拉强度最高可提升21.7%,抗折强度最高可提升17.3%。The use of biochar in concrete materials can improve its mechanical properties,achieve carbon sequestra⁃tion,and enrich the way of solid waste utilization of biomass materials.In order to study the working performance and mechanical properties of three kinds of biochar concrete,biochar concrete with coconut shell,corn straw,and rice husk at different ages are prepared by replacing cement with different mass percentages,and the slump and ba⁃sic mechanical properties of biochar concrete are studied.The microstructure and hydration products of biochar con⁃crete are observed by SEM and XRD.The results show that biochar promotes the formation of hydrated calcium sili⁃cate in concrete,and the overlapping of hydration products is dense,which fills the internal pores and increases the compactness,thus improving the macroscopic mechanical properties of concrete.Biochar significantly improves the early strength of concrete at 7 d and 14 d.The early compressive strength is increased by up to 19.7%;the splitting tensile strength is increased by up to 21.7%,and the flexural strength is increased by up to 17.3%.

关 键 词：椰壳生物炭 玉米秸秆生物炭 稻壳生物炭 

分 类 号：TU528[建筑科学—建筑技术科学]