Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Glass fiber

Effect of Addition Carbon And Glass Fibers On Bond Strength of Steel Reinforcement and Normal Concrete

Rana Hashim Ghedan

Engineering and Technology Journal, 2013, Volume 31, Issue Issue1A [Engineering], Pages 81-97
DOI: 10.30684/etj.2013.71250

The concept of composite materials using fibers as reinforcement is not new. The aim of composing materials is to improve some properties of the original materials. In civil engineering, fiber reinforced concrete was one of the topics of interest. Using fibrous concrete in reinforced concrete structures arises a question of how does it affect the bond strength between the concrete and reinforcing steel bars. Thus, the present experimental study are carried out to have a clear understanding of the bond strength between normal concrete with two selected types of fibers which were carbon and glass fiber and steel reinforcing bars. Forty five pullout cubic specimens of size 150mm were fabricated and tested to serve that purpose. They were divided into five groups to study the effect of some selected parameters such as, type of fiber (carbon and glass),reinforcing bar diameter(12mm,16mm and 20mm)and fiber to cement ratio(f/c) by weight(0.75% and 1% ). Also, three concrete cubes having the same size of the pullout specimens from each concrete mix were tested in compression to find their compressive strength. It was found that the addition of glass fiber with bar diameter=16mm has much effect in enhancing bond strength than that enhancement accrued by addition of carbon fiber, the bond strength increases by about 13.6 % and 4.5 % with the addition of 0.75% and 1% glass fiber. On the other hand, the bond strength increases as bar diameter decreases.The addition of the carbon or glass fibers increases the bond strength for specimens with smaller bar diameter and vice versa and the fiber(either glass or carbon) to cement ratio of 0.75% give higher bond strength than that of 1.0%.

Study Some of Mechanical Properties and Effects of Immersion in Solution of (Epoxy /Unsaturated Polyester) Blend Which Reinforced with Glass Fiber

Engineering and Technology Journal, 2011, Volume 29, Issue 10, Pages 464-473

In this research, polymer blend was prepared from Epoxy resin and unsaturated polyester resin as matrix material (EP/UPE) with weight ratio (90/10) %. E-glass fibers type (woven roven) was used as a reinforcement material with volume fraction for fibers (Vf =30 %) by using hand lay-up method. Some mechanical properties were studied on the specimens of the above mentioned materials and then the results of the blend (EP/UPE) compared with its composite which was reinforced with glass fibers. The samples were immersed in (H2SO4) and (NaOH) solutions with normality (0.1 N) at room temperature for (7,
14, 21, 28) days. The effects of the immersion were noticed on the hardness and impact strength values. It was found that the reinforcement with glass fiber leads to the increasing of both impact strength and shore hardness of the composite before the
immersion. The effects of immersion showed decreasing of hardness values after immersion samples in to both above solutions while the results of impact strength showed an increasing after the immersion in to the acidic solution and decreasing of the pure blend and its composite after the immersion in to the basic solution.

Fatigue Study Of E-Glass Fiber Reinforced Polyester Composite Under Fully Reversed Loading And Spectrum Loading

Muhannad Z. Khelifa; Hayder Moasa Al-Shukri

Engineering and Technology Journal, 2008, Volume 26, Issue 10, Pages 1210-1224

Study of the fatigue behaviors experimentally and theoretically of a composite
material manufactured for this paper by stacking four layers of E-glass fiber in
different angle orientations (0o, ± 45o, 0o/90o) immersed in polyester resin with total
thickness 4 mm. They were tested under two types of dynamic loads in fully reversible
tension-compression load at (R=-1) and spectrum load as fatigue testing, to estimate life
curves and microscopic an examination was carried out for stress affected and fracture
areas. Finite Element Analysis (FEA) using ANSYS Workbench™ was used to
evaluate the composite behaviour under fatigue conditions. The results of the fatigue
test show that the uniaxial [04] composite has the highest strength and the fatigue
degradation is also the highest. The high magnification optical microscopy method
shows that the failure of laminas at ± 45oand 0o/ 90o is due to matrix failure in the
direction of the fiber, whereas for the unidirectional lamina at 0o, the failure is due to
fiber breakages.