Experimental Study on the Performance of Graded Glass Fiber Reinforced Concrete (G-GRC) Based on Engineering Application

Abstract

An important way to improve concrete performance is the use of alkali-resistant glass fibers (ARGFs) as reinforcement. This paper is based on the problems of the cracking of the partition wall and lining seepage in Laoshan Tunnel, Qingdao, China. Two types of ARGFs were selected as reinforcement materials for the partition wall and lining concrete: high dispersion (HD) and high performance (HP); and the compressive strength (CS), tensile strength (TS), flexural strength (FS), and impervious performance (IP) of concrete with different gradations of the two types of fibers were investigated. The results show that although the CS of graded glass fiber reinforced concrete (G-GRC) is slightly decreased, the TS, FS, and IP of G-GRC are significantly improved. When the densities of the ARGFs of HD and HP are 0.6 and 5 kg/m3, respectively, G-GRC performs best; additionally, compared with ordinary concrete, the TS, FS, and IP of G-GRC are increased by 15.86%, 14.90%, and 31.58%, respectively. Meanwhile, the tension–compression ratio is increased by 22.29%, and the mechanical properties of concrete are remarkably enhanced. The research results were successfully applied to the construction of the Laoshan tunnel, and good engineering results were obtained.

Study on Performance Tests and the Application of Construction Waste as Subgrade Backfill

“…The reasons for the change in the maximum dry density are as follows: when the amount of construction waste aggregate increases, the contact between the coarse particles gradually assumes a skeleton function [ 28 , 29 ], and the lime-fly ash (LFA) fills in the middle of the pores. When the two reach a certain proportion limit, the optimal dry density of the mixture reaches a maximum.…”

Effect of Fiber Content on Mechanical Properties and Microstructural Characteristics of Alkali Resistant Glass Fiber Reinforced Concrete

“…Each fber content was prepared with three specimens, and two trial runs were done to achieve the compressive strength of the two curing periods [52,53]. Twenty-one ARGFRC beams (dimension: 100 mm × 100 mm × 350 mm) with a standard curing period of 28 days were prepared to conduct the fexural test per the standard recommended by the American Society for Testing and Materials Standard (ASTM) C1609/C1609M-19a [41], each fber content cast with three specimens. As stated in CECS 13-2009 [52], a total of 42 ARGFRC columns (150 mm diameter and 63 mm height) were cast to investigate the impact properties, with six specimens for each fber content after 28 days of standard curing.…”

“…Results indicated the optimal load-bearing capacity of GFRP (glass fber reinforced polymer) reinforced GFRC beam was at 1.0% fber content [38]. Le [41].…”

Experimental Study on Tensile Mechanical Properties and Reinforcement Ratio of Steel–Plastic Compound Geogrid-Reinforced Belt

“…Li et al [24,25] studied the FRP composite theory using the stress-strain analysis method of a fiber and matrix, which provided an important reference for the composite strength analysis of steel-plastic compound geogrid-reinforced belt. When the steel-plastic compound geogrid-reinforced belt is subjected to longitudinal tensile force, the tensile force is regularly distributed in the cross section of the steel-plastic compound geogrid-reinforced belt according to the stress-strain relationship between the steel wire and polyethylene material in the reinforced belt.…”

“…When the steel-plastic compound geogrid-reinforced belt is subjected to longitudinal tensile force, the tensile force is regularly distributed in the cross section of the steel-plastic compound geogrid-reinforced belt according to the stress-strain relationship between the steel wire and polyethylene material in the reinforced belt. Li et al [24,25] studied the FRP composite theory using the stress-strain analysis method of a fiber and matrix, which provided an important reference for the composite strength analysis of steel-plastic compound geogrid-reinforced belt. When the steel-plastic compound geogrid-reinforced belt is subjected to longitudinal tensile force, the tensile force is regularly distributed in the cross section of the steel-plastic compound geogridreinforced belt according to the stress-strain relationship between the steel wire and polyethylene material in the reinforced belt.…”