摘要
研究开发新型绿色低碳、固碳的路面材料对实现国家“双碳”战略目标具有重要意义。为实现节能减排、有效固碳的目标,本研究选取稻壳炭(RHB)作为添加剂,将其应用于水泥稳定碎石中,并开展无侧限抗压强度、劈裂强度、弯拉强度、抗压回弹模量、抗冻性能、干缩性能和温缩性能等试验研究RHB对水泥稳定碎石性能的影响。结果表明,当RHB掺量为5%(质量分数)时,水泥稳定碎石路用性能最好,此时水泥稳定碎石的7 d无侧限抗压强度、7 d劈裂强度和28 d弯拉强度相较于未掺RHB时分别提高了49.3%、20.9%和6.5%,同时抗干缩性能显著改善,总干缩系数降低了21.8%。稻壳炭的多孔隙结构能够储存大量水分,提供良好的内养护环境,并参与水化反应,将水化产物吸附在一起,使产物更加致密,从而显著提高水泥稳定碎石的整体性能。
The development of new green,low-carbon,and carbon-sequestering pavement materials is of great significance to realize of“dual carbon”strategic goals.To achieve energy conservation,emission reduction,and effective carbon sequestration,this study selected rice husk biochar(RHB)as an additive and applied to cement-stabilized crushed stone and conducted a series of tests,including unconfined compressive strength,splitting strength,bending tensile strength,compressive resilience modulus,frost resistance,drying shrinkage performance,and thermal shrinkage performance to investigate the influence of RHB on the performance of cement-stabilized crushed stone.The results show that when the RHB content is 5%(mass fraction),the road performance of cement-stabilized crushed stone is optimal.At this content,the 7 d unconfined compressive strength,7 d splitting strength,and 28 d bending tensile strength increase by 49.3%,20.9%and 6.5%,respectively,compared to the control group without RHB.Meanwhile,the drying shrinkage performance is significantly improved and the total drying shrinkage coefficient reduces by 21.8%.The porous structure of RHB can store a large amount of water,providing an excellent internal curing environment.It also participates in the hydration reaction and adsorbs hydration products together,making the products denser,thereby significantly enhancing the overall performance of cement-stabilized crushed stone.
作者
王大明
朱业伟
张自鑫
洪鑫文
缪淳杰
WANG Daming;ZHU Yewei;ZHANG Zixin;HONG Xinwen;MIAO Chunjie(College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China)
出处
《硅酸盐通报》
北大核心
2025年第8期3105-3115,共11页
Bulletin of the Chinese Ceramic Society
基金
住房和城乡建设部2019年科学技术计划项目(江苏省)(2019-K-140)。
关键词
水泥稳定碎石
稻壳炭
力学性能
抗干缩性能
微观结构
cement-stabilized crushed stone
rice husk biochar
mechanical property
drying shrinkage resistance
microstructure
