Engineering and Technology Journal

Influence of Minimum Tension Steel Reinforcement on the Behavior of Singly Reinforced Concrete Beams in Flexure

Ali A. Abdulsada; Raid I. Khalel; Kaiss F. Sarsam

Volume 38, 7A , July 2020, , Page 1034-1046

https://doi.org/10.30684/etj.v38i7A.902

Abstract

The requirements of minimum flexural reinforcement in the last decades have been a reason for controversy. The structural behavior of beams in bending is the best way of investigating ... Read More ...

Influence of Spirals on the Behavior of Short RC Columns Strengthened by External CFRP

Kaiss F. Sarsam; Raid I. Khalel; Mohammed A. Hadi

Volume 36, 2A , February 2018, , Page 223-233

https://doi.org/10.30684/etj.36.2A.15

Abstract

An experimental study was carried out to investigate the behavior of normal strength reinforced concrete (RC) circular short columns strengthened by carbon fiber reinforced polymer ... Read More ...

Effect of Re-vibration Process on Axial Capacity of Short Reinforced Concrete Circular Columns

S.A. Abbas

Volume 35, 7A , July 2017, , Page 776-787

https://doi.org/10.30684/etj.35.7A.15

Abstract

A considerable amount of research work has been performed on the effects of vibrating of fresh concrete on the reduction of shrinkage and creep, the improvement bond stress between ... Read More ...

An Experimental Study on the Shear Strength of High-performance Reinforced Concrete Deep Beams without Stirrups

Sinan Abdulhkaleq Yaseen

Volume 34, 11A , November 2016, , Page 2123-2139

https://doi.org/10.30684/etj.34.11A.17

Abstract

High-performance fiber-reinforced concrete is a new class of concrete that has been developed in recent decades. It exhibits enhanced properties such as high compressive strength and ... Read More ...

Direct Shear Behavior of Carbon Fiber Reinforced Self- Compacting Concrete

Kaiss F. Sarsam; Tareq S. Al-Attar; Ghzwan Ghanim Jumah

Volume 32, Issue 10 , October 2014, , Page 2491-2513

https://doi.org/10.30684/etj.32.10A.13

Abstract

This paperrepresents an experimental and statistical investigation for the behavior of connectionpoints produced by using self-compacting concrete and subjected to direct shear. The ... Read More ... This paperrepresents an experimental and statistical investigation for the behavior of connectionpoints produced by using self-compacting concrete and subjected to direct shear. The investigation also includes the effect of carbon fiber inclusion as reinforcement on self-compacting concrete (SCC) behavior in direct shear. This study gives results of sixteen push-off or direct shear specimens in four groups. Variations include volume fraction for carbon fiber (V_f= 0.00, 0.50, 0.75 and 1.00) % for every percentage change in the steel reinforcement. The steel reinforcement parameter ρ_vf f_y values are (0.00, 2.66, 5.33 and 7.99) MPa(where ρ_vf varies from 0.00 to 0.0173 and f_y=585.7MPa) . The main material properties studied include compressive strength, splitting tensile strength and modulus of rupture. Measurements of deformations were made throughout testing of shear specimens. The dimension of the shear plane in the push-off specimenswas 170x185 mm. The shear reinforcement was normal to the shear plane. Specimens were cast by using SCC which is a type of high performance concreteand reinforced with carbon fiber. This work aims to investigate the direct shear behavior of SCC with or without carbon fiber at constant water to cementitious materials ratio of 0.3 by weight. It is found that using carbon fiber increased the direct shear strength. However, carbon fiber alone (without reinforcement) leads to brittle failure. In contrast, adding rebars leads to higher strain and more ductile behavior-increased shear capacity is obtained when higher steel quantity is used. The aim of adding carbon fibers was the increase of the horizontal strain (displacement). It was found that the optimum percentage of volume fraction was 0.75 % for fresh and hardened concrete. In addition, the effects of carbon fiber on compressive strength of SCC lead to a drop in compressive strength (f_c^') compared with reference specimens. This drop in f_c^' was 2.39, 8.38 and 13.58% for V_f=0.50, 0.75 and 1.00%, respectively. In contrast, the splitting tensile strength increased by 3.34, 31.2 and 18.2 as compared with the cylinder strength without carbon fibers atV_f equal to0.50, 0.75 and 1.00% respectively. The modulus of rupture increased by [11.9, 21.99 and 13.83%] as compared with SCC without carbon fibers at〖 V〗_f equal to 0.50, 0.75 and 1.00% respectively. Based on push-off tests results for this work and those available in the literature, two statisticalmodels have been established using regression analysis. Four variables f_c^',f_ct,ρ_vf f_y and V_f, were included in these models. Both models showed good representation according to their coefficients of variation (COV)values. Verification of the models were done by using 273 observations from literature and the present work.

Durability Characteristics of Concrete and Reinforcing Bars Exposed to Harsh Environments

Sanaa Abdul Hadi Hafad; Farah Hamed Rashed

Volume 32, 5B , May 2014, , Page 921-937

https://doi.org/10.30684/etj.32.5B.9

Abstract

Saline pollution attack is an important factor that leads to the deterioration of the concrete, especially in industrial plants. In spite of research address the sustainability of concrete ... Read More ...

Mechanical Properties and Dynamic Response of Lightweight Reinforced Concrete Beam

Aziz Ibrahim Abdulla; Alyaa A. Ali; Ahmed Adnan Ghanee

Volume 30, Issue 2 , January 2012, , Page 293-311

https://doi.org/10.30684/etj.30.2.9

Abstract

The study is conducted to perform two goals: The first geal is to produce a lightweight concrete using major components which are locally available with some standard admixtures.Many ... Read More ...

Investigation of the Behavior for Reinforced Concrete Beam Using Non-Linear Three-Dimensional Finite Elements Model

Israa Kh. AL-Shimmari; Nagham T.Hamad; Waleed A Waryosh

Volume 29, Issue 10 , July 2011, , Page 1870-1885

https://doi.org/10.30684/etj.29.10.1

Abstract

This study presents theoretical investigation that reinforced concrete and composite construction might be suitably combined to give a new structural material: composite reinforced ... Read More ...

Evaluation of Elastic Deflections and Bending Moments for Orthotropically Reinforced Concrete Rectangular slabs Supported on Three Edges Only

Hisham M. AL-Hassani; Husain M. Husain; Asmaa Ali Ahmad

Volume 27, Issue 7 , May 2009, , Page 1247-1259

https://doi.org/10.30684/etj.27.7.2

Abstract

This paper deals with the evaluation of the elastic deflections and bending momentsfor orthotropically reinforced concrete rectangular slabs supported on three variouslyrestrained edges ... Read More ...

Design charts for channel shaped reinforced concrete short columns subjected to axial compressive load and uniaxial bending

Sarmad S. Abdul-Qader AL-Badri; Asmaa A. Ahmad

Volume 27, Issue 4 , March 2009, , Page 809-820

https://doi.org/10.30684/etj.27.4.17

Abstract

Eight design charts are presented for reinforced concrete short C-columns subjected to axial compressive load plus uniaxial bending. For design these charts can be used for determining ... Read More ...

Experimental Tests on Orthotropically RC Rectangular Slabs Having Various Restrained Edges and Subjected to Uniform Load

Husain M. Husain; Hisham M.AL-Hassani; Sarmad S. Abdul-Qader AL-Badri

Volume 27, Issue 5 , March 2009, , Page 913-929

https://doi.org/10.30684/etj.27.5.6

Abstract

In this research, nine orthotropically reinforced concrete (RC) rectangular slabshaving various boundary restraints at the edges are tested under uniformly distributedload. The main ... Read More ...

Flexural Rigidity of Slender RC Columns

Sabeh Z. Al-Sarraf; Ihsan A. S. Al-Shaarbaf; Bassman R. Al-Bakri; Kaiss F. Sarsam

Volume 27, Issue 1 , January 2009, , Page 96-115

https://doi.org/10.30684/etj.27.1.8

Abstract

166320 hypothetical reinforced concrete (RC) columns, each with a differentcombination of variables, were used to investigate the major variables that affect theflexural rigidity (EI) ... Read More ...

Keywords = Reinforced concrete

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract