共聚甲醛纤维超高性能水泥基复合材料抗弯性能试验
Flexural performance of ultra-high performance fiber reinforced cementitious composite material doped with copolymer formaldehyde fiber
王春生 1张洋 1段兰1
作者信息
- 1. 长安大学 公路学院,西安 710064
- 折叠
摘要
为探究共聚甲醛纤维超高性能水泥基复合材料(UHPFRC)的抗弯力学性能,设计并测试了 5组抗弯试件,包括 3组纤维单掺型试件和 2组纤维混杂型试件.结果表明:共聚甲醛纤维UHPFRC试件中,纤维体积掺量为 2vol%时,UHPFRC试件具有更好的抗弯强度,平均强度可达 13.4 MPa;适量的共聚甲醛纤维可延缓UHPFRC基体的开裂,增强其裂前变形能力,5组试件中,2vol%共聚甲醛纤维UHPFRC试件的开裂挠度最大,可达 0.65 mm;混杂纤维可更好地增强UHPFRC的抗弯强度和韧性,1.5vol%共聚甲醛纤维和 1.5vol%钢纤维混掺时,UHPFRC试件抗弯强度可达 13.9 MPa,同时该组试件的韧性最好.本文揭示了共聚甲醛纤维在UHPFRC抗弯力学性能方面的作用效果,对其在UHPFRC中的应用及UHPFRC的推广具有重要参考价值.
Abstract
In order to investigate the flexural performance of ultra-high performance fiber reinforced cementitious composite material(UHPFRC)doped with copolymer formaldehyde fiber,five groups of bending specimens were designed and tested,including three groups of single mixed specimens and two groups of fiber hybrid specimens.The results show that among the copolymer formaldehyde fiber UHPFRC specimens,2vol%copolymer formalde-hyde fiber UHPFRC specimens have better flexural strength,with an average strength of 13.4 MPa.An appropriate amount of co-formaldehyde fiber can delay the cracking of UHPFRC matrix and enhance its ability to deformation before cracking.Among the five groups of test pieces,the cracking deflection of 2vol%copolymer formaldehyde fiber UHPFRC test piece is the largest,which can reach 0.65 mm.Hybrid fiber can better enhance the flexural strength and toughness of UHPFRC.When 1.5vol%copolymer formaldehyde fiber and 1.5vol%steel fiber are mixed,the flexural strength of UHPFRC specimens can reach 13.9 MPa,and the toughness of this group of specimens is the best.The research reveals the effect of copolymer formaldehyde fiber on the flexural mechanical properties of UHPFRC,which has important reference value for its application in UHPFRC and the promotion of UHPFRC.
关键词
共聚甲醛纤维/超高性能水泥基复合材料/抗弯性能/纤维类型/纤维掺量Key words
copolymer formaldehyde fiber/ultra-high performance fiber reinforced cementitious composite material/flexural performance/fiber type/fiber content引用本文复制引用
基金项目
&&(51578073)
&&(2019TD-022)
出版年
2024
NETL
NSTL
维普
万方数据