纤维增强泡沫轻质土力学特性与公路改扩建应用研究  

RESEARCH ON THE MECH ANICAL PROPERTIES OF FIBER-REINFORCED LIGHTWEIGHT FOAMED CONCRETE AND ITS APPLICATION IN HIGHWAY RECONSTRUCTION AND EXPANSION

作　　者：刘伟 LIU Wei(China Railway Twelfth Bureau Group Seventh Engineering Co.,Ltd.,528400,Changsha,China)

机构地区：[1]中铁十二局集团第七工程有限公司,长沙528400

出　　处：《建筑技术》2025年第6期746-750,共5页Architecture Technology

摘　　要：针对泡沫轻质土(LFC)在道路工程应用中力学性能较差的问题,探讨了纤维增强技术对其无侧限抗压强度、抗弯强度和弹性模量的提升效果,并依托实际公路改扩建工程进行了应用。选用玻璃纤维(GF)和聚丙烯纤维(PPF)作为增强材料,通过不同掺量及配合比,系统分析了不同纤维对泡沫轻质土力学性能的改善作用。结果表明,0.2%GF+0.4%PPF的混合纤维组合表现出最佳增强效果,显著提升了材料的综合性能。该组合下泡沫轻质土的抗压强度达到3.85MPa,抗弯强度达到1.54MPa,弹性模量提升至1.40GPa,均显著高于单一纤维的增强效果。混合纤维通过优化应力传递路径和平衡材料刚性与韧性,实现了性能的最大化提升。This study addresses the issue of poor mechanical performance of lightweight foamed concrete(LFC)in road engineering applications and explores the effectiveness of fiber reinforcement in improving its unconfined compressive strength,flexural strength,and elastic modulus.The study also involves practical application in a highway reconstruction and expansion project.Glass fibers(GF)and polypropylene fibers(PPF)were selected as reinforcement materials,and their effects on the mechanical properties of LFC were systematically analyzed through various dosages and combination ratios.The results indicate that the combination of 0.2%GF and 0.4%PPF demonstrated the optimal enhancement,significantly improving the overall performance of the material.Specifically,this combination increased the compressive strength of LFC to 3.85 MPa,the flexural strength to 1.54 MPa,and the elastic modulus to 1.40 GPa,all of which were markedly higher than the effects of single-fiber reinforcement.The study also shows that mixed fibers optimize stress transfer paths and balance material stiffness and flexibility,achieving maximum performance enhancement.

关 键 词：纤维增强泡沫轻质土 力学特性 公路改扩建 玻璃纤维 聚丙烯纤维 

分 类 号：TU74[建筑科学—建筑技术科学]