Effects of nano-silica on fracture properties and mechanism analysis of basalt fiber reinforced concrete

Xie, Lei1,2; Sun, Xinjian1,2; Yu, Zhenpeng3; Lian, Huiheng4; He, Huihui1,2; Wang, Lihong1,2; Zhang, Zetian1,2; Xu, Xiaoli1,2

2024-08-16

10.1016/j.conbuildmat.2024.137375

CONSTRUCTION AND BUILDING MATERIALS   影响因子和分区

0950-0618

1879-0526

The reinforcing effect of basalt fibers (BFs) on the performance of concrete mainly relies on the bridging effect of fibers, while recently, it has been shown that nano-silica (NS) may further enhance this effect. In this paper, three-point bending fracture tests were carried out on BF reinforced concrete (BFRC) to determine the optimal BF condition (i.e. volume content and length). Based on this optimal condition, the effect of NS content on the fracture performance of BFRC was examined from macroscopic and microscopic perspectives. The results indicate that the optimal BF condition for yielding the best concrete performance was 0.2 % volume content and 6 mm fiber length. Based on this condition, NS at 1 % mass content could improve its fracture performance to the best extent. Specifically, the crack initiation toughness, unstable fracture toughness and fracture energy were 1.83 MPa center dot m0.5, 3.35 MPa center dot m0.5 and 364.42 N/m, respectively, which were improved by 5.58 %, 15.93 % and 4.97 % compared to BFRC. NS mainly affects the crack propagation mode of BFRC by enhancing the fiber bridging effect or altering the way BFs play a bridging role. NS at an appropriate mass content can delay the occurrence of cracks and improve the deformation ability of BFRC.

Nano -silica Basalt fiber reinforced concrete Fracture toughness Interfacial fracture energy Fracture process zone (FPZ)

SCI ; EI

英语

其他

National Natural Science Foundation of China[52379127] ; Natural Science Foundation of Qinghai Province in China[2023-ZJ- 779]

Construction & Building Technology ; Engineering ; Materials Science

Construction & Building Technology ; Engineering, Civil ; Materials Science, Multidisciplinary

WOS:001267093700001

ELSEVIER SCI LTD

20242816661916

Basalt ; Bending tests ; Cracks ; Ductile fracture ; Fiber reinforced materials ; Fibers ; Fracture energy ; Fracture testing ; Reinforced concrete ; Silica

Concrete:412 ; Strength of Building Materials; Test Equipment and Methods:422 ; Mechanics:931.1

MATERIALS SCIENCE

Web of Science

1.Qinghai Univ, Sch Civil Engn & Water Resources, Xining 810016, Peoples R China
2.Lab Ecol Protect & High Qual Dev Upper Yellow Rive, Xining 810016, Qinghai, Peoples R China
3.Shanghai Univ, Sch Mech & Engn Sci, Dept Civil Engn, Shanghai 200444, Peoples R China
4.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen 518000, Peoples R China

Xie, Lei,Sun, Xinjian,Yu, Zhenpeng,et al. Effects of nano-silica on fracture properties and mechanism analysis of basalt fiber reinforced concrete[J]. CONSTRUCTION AND BUILDING MATERIALS,2024,439.

Xie, Lei.,Sun, Xinjian.,Yu, Zhenpeng.,Lian, Huiheng.,He, Huihui.,...&Xu, Xiaoli.(2024).Effects of nano-silica on fracture properties and mechanism analysis of basalt fiber reinforced concrete.CONSTRUCTION AND BUILDING MATERIALS,439.

Xie, Lei,et al."Effects of nano-silica on fracture properties and mechanism analysis of basalt fiber reinforced concrete".CONSTRUCTION AND BUILDING MATERIALS 439(2024).