November 25, 2024
Shaker Hashemi

Shaker Hashemi

Academic Rank: Associate professor
Address: -
Degree: Ph.D in -
Phone: -
Faculty: Faculty of Engineering

Research

Title
Investigation of compressive behavior of confined concrete including embedded glass fiber mesh
Type Thesis
Keywords
بتن محصور شده، رفتار فشاري، مش الياف شيشه مدفون
Researchers Mohsen Matin (Student) , Shaker Hashemi (Primary advisor) , Mohammad Vaghefi (Advisor)

Abstract

In recent years, the use of FRP fiber-reinforced polymer coatings for strengthening concrete members and extending their service life has become increasingly common. High strength and hardness, low weight, corrosion resistance, fast and easy installation compared with steel sheets are important features of FRP-reinforced polymers. The compressive behavior of concrete enclosed with buried glass fiber mesh is examined in this thesis. The mesh used in this study has opening with 20mm dimension, weight of 240 g / m2 and tensile strength of 60 KN / m. For this purpose, 42 standard concrete cylindrical specimens, 150 mm in diameter and 300 mm in height, were manufactured both with and without glass fiber mesh. The enclosed specimens consist of 1, 1.5 and 2 layers of circular mesh layers and 10 and 20 mm concrete coatings. The mentioned specimens have been tested after fabrication, then the stress-strain curves are extracted through the test process. . The compressive behaviors of different layers and coatings are evaluated in terms of formability, energy absorption under [compressive] loads. The results show- that the bonding strength of 28 days old confined specimens via glass fiber mesh is reduced by about 3 percent, while their ductility is improved and the softening behavior of concrete is increased by approximately 20 percent. Examination of the specimens revealed that the ductility and energy absorption of the specimens were directly related to the number of layers. For further studies, the effect of different fiber alignments on the behavior of the enclosed concrete has been investigated. For this purpose, samples with different numbers of layers and coatings of concrete were tested by a 45 degrees confined mesh at the age of 28 days. The results showed that the use of 45 degrees fiber mesh increased the enclosure resistance by around 6 percent and improved the energy absorption after yielding in comparison with 90-degrees fiber mesh , although the ductility of the