Mechanical Properties of Ultra-high Performance Concrete Reinforced by Glass Fibers under Accelerated Agin

Abstract

Ultra-High Performance Concrete (UHPC) is a cementitious composite with fine aggregates and a homogeneous matrix with high compressive strength and excellent durability against aggressive agents. It is common to use short steel fibers in the UHPC. Besides, using steel fibers considerably increases the flexural ductility, durability and energy absorption. Using glass fibers in UHPC is a novel technique which improves its mechanical properties and it has the benefit of being lighter, and cheaper than steel fibers. Furthermore, glass fibers can be used for thin concrete plates for aesthetic purposes. However, glass fibers reinforced concrete is incompatible with the hydration reaction in the alkaline environment of concrete as it can damage glass fibers, so the mechanical properties of the concrete are decreased over long periods. The mechanical properties of UHPC containing glass fibers (GF-UHPC) was investigated under three regimes of normal curing, autoclave curing, and autoclave curing plus being in hot water for 50 days (accelerated aging). Besides, the substitution of silica fume by Metakaolin in GF-UHPC was studied to understand its mechanical properties after thermal curing. The results showed that after accelerated aging, the behavior of specimens become more brittle and the modulus of rupture and toughness indices of all prismatic specimens decreased, the modulus of rupture for samples containing glass fibers was 40% lower than autoclave curing results. However, the compressive strength under accelerated aging increased at least 4% in comparison to the normal curing. Replacement of silica fume with Metakaolin slightly increased the toughness with regard to flexural strength.

Flexural Strength and Behavioral Study of High-Performance Concrete Beams using Stress-Block Parameters

“…The innovation in concrete technology has made use of concrete with increasing compressive strength and hence compared to conventional concrete and HSC, [1,2]. HPC has many advantages as compared to conventional concrete.…”

Stress-Strain Characteristics of Reactive Powder Concrete Under Cyclic Loading

“…RPC shows higher resistance under high concentrations of acids [23]. A study on mechanical properties of RPC was done by Madhkhan and Saeidian [24]. Glass fibres by volume of 1.5 -2% were added.…”

“…Normal curing yielded 90-100 MPa compressive strength. RPC with 110 -140 MPa strengths were obtained with autoclave curing and accelerated ageing methods [24].…”

Elevated Temperature Performance of Concrete Reinforced with Steel, Glass, and Polypropylene Fibers and Fire-proofed with Coating

“…The previously *Corresponding Author Institutional Email: a.r.zareei@Khuisf.ac.ir (A. R. Zareei) mentioned phenomena can expose the steel reinforcements inside the concrete to heat, which can have devastating effects on the load-bearing capacity and stability of the concrete structure. Furthermore, the alkalinity tends to reduce as a result of carbonation, which is intensified by fire, and thus the corrosion risk of steel rebars escalates [7,8]. At temperatures beyond 400 °C, the paste begins to shrink and the aggregates expand, which cause a significant strain gradient in the matrix [9].…”