硅酸盐通报2025，Vol.44Issue(2)：455-462,8.DOI:10.16552/j.cnki.issn1001-1625.2024.1060
苎麻纤维对再生混凝土力学强度的影响
Effect of Ramie Fiber on Mechanical Strength of Recycled Aggregate Concrete
摘要
Abstract
In order to improve the mechanical properties of recycled aggregate concrete(RAC),ramie fiber(RF)was added into the concrete.The effects of recycled coarse aggregate(RCA)and RF on compressive strength,flexural strength and splitting strength of concrete were studied.The effects of RF on concrete properties and the improvement mechanism were further explored through nitrogen adsorption method and scanning electron microscope analysis.The mechanical properties of recycled aggregate concrete firstly increase and then decrease with the increase of RF content.When the replacement rate of RCA is 30％(mass fraction),the bending strength and splitting strength of the concrete with 0.5％(volume fraction)RF is 11.5％higher than that without RF.It can be seen from the microscopic analysis that the high water absorption rate of RF can make the cement paste on the fiber surface produce hydration reaction,and the generated hydrated calcium silicate gel fills the pores and thus increases the compressive strength of concrete.However,RF is prone to agglomerate when mixing concrete,forming weak areas,increasing internal defects,and inhibiting the improvement of compressive strength.The addition of RF has a relatively small effect on the improvement of compressive strength of concrete.RF surface is rough and has vertical stripes,which increases the bond strength of both sides of concrete cracks,acts as a bridge on both sides of concrete cracks,limits the development of concrete cracks under tensile load,and can greatly improve the flexural and splitting strength of concrete.关键词
再生混凝土/苎麻纤维/再生粗骨料/抗压强度/抗折强度/抗劈裂强度/微观分析Key words
recycled aggregate concrete/ramie fiber/recycled coarse aggregate/compressive strength/flexural strength/splitting strength/microscopic analysis分类
建筑与水利引用本文复制引用
阎杰,邢国斌,冯龙辉,梁重阳,谢军,翁维素,白启敬..苎麻纤维对再生混凝土力学强度的影响[J].硅酸盐通报,2025,44(2):455-462,8.基金项目
2023年度张家口市科技局指导项目(2322145D) （2322145D）
2024年河北省建设科技研究指导性计划项目(2024-2187,2024-2188) （2024-2187,2024-2188）
河北省科技厅科技支撑计划项目(20373802D) （20373802D）
