稻壳炭-水泥稳定碎石路用性能研究

doi:10.16552/j.cnki.issn1001-1625.2025.0168

摘要/Abstract

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。

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

Abstract: 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.

Key words: cement-stabilized crushed stone, rice husk biochar, mechanical property, drying shrinkage resistance, microstructure

中图分类号:

U414

王大明, 朱业伟, 张自鑫, 洪鑫文, 缪淳杰. 稻壳炭-水泥稳定碎石路用性能研究[J]. 硅酸盐通报, 2025, 44(8): 3105-3115.

WANG Daming, ZHU Yewei, ZHANG Zixin, HONG Xinwen, MIAO Chunjie. Road Performance of Rice Husk Biochar Cement-Stabilized Crushed Stone[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(8): 3105-3115.

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