摘要
为改善水泥稳定碎石力学及耐久性能,研究了不同PVA纤维长度与掺量下水泥稳定碎石系列力学性能,确定了PVA纤维最佳掺配长度及掺量。在此基础上,借助冻融循环与疲劳试验,研究了普通水泥稳定碎石与PVA纤维水泥稳定碎石耐久性能差异。结果表明:随着PVA纤维长度或掺量的增大,PVA纤维水泥稳定碎石系列力学性能均先增大后减小;长度12 mm、掺量0.9 kg/m^(3)的PVA纤维水泥稳定碎石综合性能最佳;28 d龄期时,在冻融5、10、15次后,长度12 mm、掺量0.9 kg/m^(3)的PVA纤维水泥稳定碎石抗压强度保持率为90.21%~84.39%;长度12 mm、掺量0.9 kg/m^(3)的PVA纤维水泥稳定碎石在应力强度比为0.7~0.8下,疲劳寿命提升了13529%~17501%。
To improve the mechanical and durability properties of cement stabilized-macadam,the evolution law of series mechanical properties of cement stabilized-macadam with different PVA fi-ber length and dosage were investigated,and the optimum length and dosage of PVA fiber were de-termined.On this basis,the difference in durability between ordinary cement-stabilized macadam and PVA fiber cement-stabilized macadam was studied by means of freeze-thaw cycle and fatigue test.The results show that the series mechanical properties of PVA fiber cement stabilized-macadam increase and then decrease with the increase of PVA fiber length or dosage.Compared with the oth-er test schemes,the comprehensive performance of PVA fiber cement stabilized-macadam with 12 mm length and 0.9 kg/m^(3) dosage is the best.At 28 d,after 5,10 and 15 freeze-thaw cycles,the compressive strength retention rate of PVA fiber cement stabilized-macadam with 12 mm length and 09 kg/m^(3) dosage is 90.21%~84.39%.The fatigue life of PVA fiber cement stabilized-macadam with 12 mm length and 0.9 kg/m^(3) dosage increases by 135.29%~17501%under 0.7~0.8 stress intensity ratio.
作者
冯仲文
FENG Zhongwen(China Railway 18th Bureau Group No.5 Engineering Co.,Ltd.,Tianjin 300453,China)
出处
《沈阳理工大学学报》
CAS
2024年第6期55-60,66,共7页
Journal of Shenyang Ligong University
基金
国家自然科学基金面上项目(52378252)。
关键词
道路工程
PVA纤维
水泥稳定碎石
力学性能
耐久性能
road engineering
PVA fiber
cement stabilized-macadam
mechanical property
durability