Engineering and Technology Journal

Performance of Self-Compacting Concrete Containing Pozzolanic Materials in Aggressive Environment

L.A. Zghair; Q.J. Frayyeh; M.M. Salman

Volume 35, 5A , May 2017, , Page 439-444

https://doi.org/10.30684/etj.35.5A.2

Abstract

The aims of this study is to investigate the resistance of different SCC mixtures to aggressive solutions. The investigation included the type of the cementitious materials (silica ... Read More ...

Behavior of Tapered Self-Compacting Reinforced Concrete Beams Strengthened by CFRP

T.S. al-Attar; S.S. Abdulqader; S.K. Ibrahim

Volume 35, 3A , March 2017, , Page 197-203

https://doi.org/10.30684/etj.35.3A.3

Abstract

This study presents an experimental investigation on the behavior of fourteen reinforced self-compacting concrete tapered beams with or without strengthening. The strengthening was ... Read More ...

Interaction between learners within Self-Organized Learning Environments-Spaces of Architectural Engineering Department Case study

A.M.H. Al-Moqaram; R.R.F. Al-Amara

Volume 35, 1C , January 2017, , Page 114-132

https://doi.org/10.30684/etj.35.1C.8

Abstract

Self-organized learning environment considered as a contemporary concept that directed toward transform the education system from traditional environment architecture to scalable environment ... Read More ...

High Biometric Recognition Based on Histogram and Semi-discrete Matrix Decomposition via Neural Network

Ekbal Hussein Ali; Sameir A. Azeiz; Suad Ali Eissa

Volume 34, 12A , December 2016, , Page 2239-2248

https://doi.org/10.30684/etj.34.12A.7

Abstract

Iris recognition is regarded as the most reliable and accurate biometric identification system available highly protected and stable.Iris situating is the main focus in the procedure ... Read More ...

Structural Behavior of Self Compacting Reinforced Concrete Deep Beams Containing Openings

Nabeel A. AL-Bayati; Bassman R. Muhammad; Ahmed Salam Hasan

Volume 34, 12A , December 2016, , Page 2310-2317

https://doi.org/10.30684/etj.34.12A.13

Abstract

Eleven simple span reinforced self-compacting concrete deep beams were tested under symmetrically two points top load to examine the influence of the transverse circular openings on ... Read More ...

Response of Hybrid Waste Fiber-Self Compacted Reinforced Concrete Slabs Under Static Loading

Mazin Burhan Al-Deen Abdul Rahman; Khaled jamal ahmed

Volume 34, 9A , September 2016, , Page 232-245

https://doi.org/10.30684/etj.34.9A.17

Abstract

This work aims atassessing thebehavior of self-compacted concrete (SCC) reinforced with hybrid recycled waste fibers (RWFSCC) in two-way slabs under static loading, Waste plastic fibers ... Read More ...

Effect of Steel Fibers, Polypropylene Fibers and/ or Nanosilica on Mechanical Properties of Self-Consolidating Concrete

Rana T. Abdulkareem; Maan S. Hassan; Iqbal N. Gorgis

Volume 34, 3A , March 2016, , Page 527-538

https://doi.org/10.30684/etj.34.3A.8

Abstract

This research concerned studying the combined effect of using nano-silica and/ or hybrid fibers on key mechanical properties of self-consolidating concrete SCC. A comprehensive experimental ... Read More ...

Behavior and Strength of Concentrically Loaded Flat Slabs Using Self-Compacting High Strength Concrete With and Without Openings with Steam Curing

Esraa Khudhair Mohsin Abuzaid

Volume 34, 3A , March 2016, , Page 648-663

https://doi.org/10.30684/etj.34.3A.18

Abstract

Openings in slabs are usually required for plumbing, fire protection pipes, and ventilation ducts and air conditioning. This study presents an experimental investigation on the influence ... Read More ...

Design and Development Dynamic Functional Models of Radio Systems by Using the MATLAB System

Saad Z. Sekhi

Volume 34, 2A , February 2016, , Page 322-333

https://doi.org/10.30684/etj.34.2A.11

Abstract

In this study, we have presented brief theoretical information regarding the design of dynamic functional models of radio systems and practical recommendations for their development ... Read More ...

Fresh and Hardened Properties of Steel Fiber-Reinforced Self-Consolidating Concrete

Maan S. Hassan; Iqpal N. Gorgis; Aymn H. Ali

Volume 33, 5A , June 2015, , Page 1213-1225

https://doi.org/10.30684/etj.33.5A.16

Abstract

The main aim of this research is to study the effect of using hooked end steel fiber on the fresh and hardened properties of self-consolidating concrete. The experimental work includes ... Read More ...

Some Properties of Self Compacting Concrete by Using Different Types of Local Rocks as a Coarse Aggregate

Ahmed H. Abed; Zena K. Abbas Al-Anbori; Firas Feisal

Volume 33, 4A , May 2015, , Page 788-801

https://doi.org/10.30684/etj.33.4A.3

Abstract

Self-Compacting Concrete (SCC) is a new type of concrete that possesses the property of high flow ability, passing ability and stability.This research aims to investigate the properties ... Read More ...

Effect of Plastic Optical Fiber on Some Properties of Translucent Concrete

Shakir Ahmed Salih; Hasan Hamodi Joni; Safaa Adnan Mohamed

Volume 32, Issue 12 , November 2014, , Page 2846-2861

https://doi.org/10.30684/etj.32.12A.1

Abstract

Translucent concrete is a building material with light-transmitting properties, due to embedded light optical elements in its mixture; and has the advantage of energy saving in addition ... 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.

Grain Size Distribution of the Self-Filtration Layer between the Base Soil and the Filter

Yousif A. H. Dallo; Yuan Wang

Volume 31, Issue 21 , December 2013, , Page 453-464

https://doi.org/10.30684/etj.2013.83877

Abstract

Some studies suggested a model to determine the grain size distribution GSD curve of the self-filtration layer that is formed at the base soil-filter interface. From these GSD curves ... Read More ...

Ear Recognition by Using Self Organizing Feature Map

Suad K. Mohammad

Volume 31, Issue 10 , July 2013, , Page 2000-2013

https://doi.org/10.30684/etj.31.10A14

Abstract

A wide variety of systems requires reliable personal recognition schemes to either confirm or determine the identity of an individual requesting their services. The purpose of such ... Read More ...

Experimental Evaluation of Effect of Flange Dimensions on Shear Behavior of NSC and SCC Double Tee Beams

Ali H. Aziz; Mohammad Zohair Yousif; Laye K. Salman

Volume 30, Issue 17 , October 2012, , Page 3039-3053

https://doi.org/10.30684/etj.30.17.7

Abstract

This study deals with, experimentally, the effect of flange dimensions on shear behavior of normal strength concrete (NSC) and self-compacting concrete (SCC) double Tee beams. Twelve ... Read More ...

New Design of Optical Filters Based on Single Mode-Multimode-Single Mode Fiber Structure for Optical Fiber Communication Systems

Jassim Kadim Hmood

Volume 29, Issue 15 , November 2011, , Page 3172-3184

https://doi.org/10.30684/etj.29.15.11

Abstract

In this paper, a design of optical filters based on single mode-multimode-single mode fiber structure (SMS) is demonstrated. The multimode interference effect can be utilized to design ... Read More ...

Breit Interaction And Radiative QED Corrections In Carbon Isoelectronic Sequence and in The Atoms 1 <= Z <= 104

Adnan Yousif Hussain

Volume 28, Issue 24 , December 2010, , Page 7004-7010

https://doi.org/10.30684/etj.28.24.14

Abstract

The multiconfiguration Dirac–Fock MCDF wavefunctions has been employed to calculate the energy contributions of the Breit interaction and radiative quantum electrodynamics QED ... Read More ...

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