森林工程2025，Vol.41Issue(5)：1054-1061,8.DOI:10.7525/j.issn.1006-8023.2025.05.018
混杂纤维及矿物掺合料对混凝土力学性能的影响
The Impact of Hybrid Fibers and Mineral Additives on the Mechanical Properties of Concrete
摘要
Abstract
In order to minimize the self-weight of the structure,it is common practice in engineering projects to utilize concrete slabs with reduced cross-sectional dimensions.To enhance the flexural strength and resistance to cracking of concrete,this study selected well-anchored end-hooked steel fibers(HSF),polypropylene fibers(PPF)that can signifi-cantly mitigate plastic shrinkage and reduce the number and width of cracks,fly ash(FA)that can improve the fluidity and long-term strength of concrete,and silica fume(SF)with high volcanic ash activity as materials to improve the me-chanical properties of concrete.This research employed the orthogonal test method to examine the influence of these four material factors on the mechanical properties of concrete when they interact simultaneously.The significance order of each factor's influence and the optiimal dosage combination were determined through range analysis.On this basis,the single-factor test was employed to verify and supplement the findings of the orthogonal test.The results from both tests were matched and the optimal dosage combinations for the four factors was obtained.The findings of the study indicated that the dosage of HSF had a significant impact on the compressive strength,flexural strength,and split tensile strength of the concrete.The single-factor test analysis further identified that the optimummixing of HSF and PPF were 0.36％and 0.15％by volume,respectively.These proportions led to an enhancement in compressive strength by 30.26％and an increase in splitting tensile strength by 12.79％,in comparison to 0％by volume.The mass fraction of optiumu ad-mixture of FA and SF were 5％and 7.5％,respectively.They can imcrease the compressive strength of concrete by 4.17％and 18.19％,respectively,compared with 0％mass fraction.Scanning electron microscopy(SEM)was con-ducted on the optimal dosage group to investigate the correlation between mechanical properties and hydration products.The results indicated that the hydration products in this group exhibited greater density,thereby facilitating the enhanced bridging role of the PPF.关键词
胶凝材料/混杂纤维/正交试验/单因素分析/微观分析Key words
Cement-based materials/hybrid fibers/orthogonal test/single-factor analysis/micro analysis分类
建筑与水利引用本文复制引用
申淼江,贾艳敏,李浩杰,史树飞..混杂纤维及矿物掺合料对混凝土力学性能的影响[J].森林工程,2025,41(5):1054-1061,8.基金项目
黑龙江省自然科学基金项目(E2017003) （E2017003）
蓝谷至胶东国际机场快速通道工程资助(HKF230500003). （HKF230500003）
