Research Paper
Effect of Bridge Piers Locations and Flow Intensity on Morphological Change in a 180-Degree River Bend
Effect of Bridge Piers Locations and Flow Intensity on Morphological Change in a 180-Degree River Bend

Abdurazaq k. Abdulwahd; Jaafar S. Maatooq

Volume 41, Issue 11 , November 2023, Page 1241-1251

https://doi.org/10.30684/etj.2023.140134.1455

Abstract
  Bridges when it crossing rivers often required multiple piers for support. One of has a limited investigation is the impact of piers on scouring and morphological aspects when a bridge ...  Read More ...
Research Paper
Cold-Bonded Lightweight Synthetic Aggregate Involving High Reactive Attapulgite at Different Curing Conditions
Cold-Bonded Lightweight Synthetic Aggregate Involving High Reactive Attapulgite at Different Curing Conditions

Mohammed L. Abbas; Waleed A. Abbas

Volume 41, Issue 11 , November 2023, Page 1252-1265

https://doi.org/10.30684/etj.2023.139775.1442

Abstract
  This study aimed to develop an eco-friendly, lightweight, and synthetic aggregate (SLA) based on clay suitable for use in structural lightweight concrete. The researchers utilized the ...  Read More ...
Research Paper
Uncracked Palm Kernel Shell Effect on Compressive Strength of Concrete
Uncracked Palm Kernel Shell Effect on Compressive Strength of Concrete

Chidiebere S. Ezenkwa; Thaddeus I. Elogu

Volume 41, Issue 11 , November 2023, Page 1266-1273

https://doi.org/10.30684/etj.2023.140014.1460

Abstract
  In recent times, the production of concrete has become a significant concern due to the rapid population growth and the depletion of raw materials. In this research, we investigated ...  Read More ...
Research Paper
Elzaki Transform Method for Natural Frequency Analysis of Euler-Bernoulli Beams
Elzaki Transform Method for Natural Frequency Analysis of Euler-Bernoulli Beams

Charles C. Ike; Tarig M. Elzaki

Volume 41, Issue 11 , November 2023, Page 1274-1285

https://doi.org/10.30684/etj.2023.140211.1456

Abstract
  Free vibration analysis of thin beams under dynamic excitation is important in design to prevent resonance failures that occur when the excitation frequency coincides with the natural ...  Read More ...
Research Paper
Free Vibration of Thin Beams on Winkler Foundations Using Generalized Integral Transform Method
Free Vibration of Thin Beams on Winkler Foundations Using Generalized Integral Transform Method

Charles C. Ike

Volume 41, Issue 11 , November 2023, Page 1286-1297

https://doi.org/10.30684/etj.2023.140343.1462

Abstract
  The determination of free vibration frequencies of thin beams on Winkler foundations is important in their design to avoid resonant failures when the excitation frequency equals the ...  Read More ...
Research Paper
Enhancing Pullout Load Performance of Under-Reamed Piles in Homogeneous Layered Clay: A Numerical Comparative Study
Enhancing Pullout Load Performance of Under-Reamed Piles in Homogeneous Layered Clay: A Numerical Comparative Study

Anji A. Al-Bayati; Mohammed A. AL-Neami; Falah H. Rahil

Volume 41, Issue 11 , November 2023, Page 1298-1308

https://doi.org/10.30684/etj.2023.140795.1474

Abstract
  A 3D numerical model generated using PLAXIS-3D software was used in the present research to predict the behavior of under-reamed piles under pullout loading conditions with presumed ...  Read More ...
Research Paper
Studying Characteristics and Strength of the Unsaturated Gypseous Soil with Various Saturation Degrees
Studying Characteristics and Strength of the Unsaturated Gypseous Soil with Various Saturation Degrees

Ahmed S. Abood; Mohammed Y. Fattah; Aqeel S. Al-Adili

Volume 41, Issue 11 , November 2023, Page 1309-1324

https://doi.org/10.30684/etj.2023.140119.1453

Abstract
  The main objective of this study is to determine the appropriateness of unsaturated gypseous soil as a subgrade layer for carrying foundations. A comprehensive laboratory testing program ...  Read More ...
Research Paper
Studying the Possibility of Producing Paving Flags from Geopolymer Concrete Containing Local Wastes
Studying the Possibility of Producing Paving Flags from Geopolymer Concrete Containing Local Wastes

Nazar F. Al- Obeidy; Wasan I. Khalil

Volume 41, Issue 11 , November 2023, Page 1325-1336

https://doi.org/10.30684/etj.2023.141321.1494

Abstract
  Geopolymer concrete is an inorganic composite material created by interacting alkaline substances with an aluminosilicate source and aggregate. Precast building units are considered ...  Read More ...
Research Paper
Some Properties of Sustainable Concrete with Rubber Waste Aggregate
Some Properties of Sustainable Concrete with Rubber Waste Aggregate

Rafid F. Motloq; Wasan I. Khalil; Eethar T. Dawood

Volume 41, Issue 11 , November 2023, Page 1337-1345

https://doi.org/10.30684/etj.2023.140271.1458

Abstract
  The cumulative quantities of non-biodegradable solid tire waste, which are byproducts of transport vehicles, contribute to environmental pollution.. This study seeks to address this ...  Read More ...
Research Paper
A Proposed New Mix Proportioning Method for Fly Ash-Based Geopolymer Concrete
A Proposed New Mix Proportioning Method for Fly Ash-Based Geopolymer Concrete

Mazin A. Alhifadhi; Tareq S. Al-Attar; Qais A. Hasan

Volume 41, Issue 11 , November 2023, Page 1346-1354

https://doi.org/10.30684/etj.2023.139354.1427

Abstract
  Global warming on planet Earth results from the high emission of greenhouse gases, especially CO2. The Portland cement industry releases high amounts of CO2 and is responsible for about ...  Read More ...
Review Paper
Stay in Place Formwork, Encased Reinforced Concrete Column: A Review
Stay in Place Formwork, Encased Reinforced Concrete Column: A Review

Zainab H. Abbas; Maan S. Hassan; Iqbal N. Gorgis

Volume 41, Issue 11 , November 2023, Page 1355-1378

https://doi.org/10.30684/etj.2023.139421.1428

Abstract
  Formwork systems are required for almost all cast-in-place concrete construction. However, some forms cost too much, often exceeding 30% of the entire cost of the concrete construction. ...  Read More ...
Research Paper
Waste Rubber Pre-treatments and Their Effects on Compressive and Flexural Strength of Modified SIFCON
Waste Rubber Pre-treatments and Their Effects on Compressive and Flexural Strength of Modified SIFCON

Ali M. Alibraheem; Basil S. Al-Shathr

Volume 41, Issue 11 , November 2023, Page 1379-1389

https://doi.org/10.30684/etj.2023.141759.1511

Abstract
  Slurry-infiltrated fiber concrete (SIFCON) is a comparatively new and unique steel fiber-reinforced concrete (FRC) form. SIFCON possesses many desirable characteristics, including high ...  Read More ...
Research Paper
A Static and Dynamic Analysis of A High-Speed Turbo Machine Foundation
A Static and Dynamic Analysis of A High-Speed Turbo Machine Foundation

Ameer A. Ahmed; Mohammed Y. Fattah; Makki K. Mohsen

Volume 41, Issue 11 , November 2023, Page 1390-1402

https://doi.org/10.30684/etj.2023.142820.1547

Abstract
  The foundation plays a significant role in safe and efficient turbo machinery operation. Turbomachinery generates harmonic load on the foundation due to its high-speed rotating motion, ...  Read More ...
Research Paper
Single Variable Thick Plate Buckling Problems Using Double Finite Sine Transform Method
Single Variable Thick Plate Buckling Problems Using Double Finite Sine Transform Method

Charles Chinwuba Ike

Volume 41, Issue 11 , November 2023, Page 1403-1413

https://doi.org/10.30684/etj.2023.142504.1537

Abstract
  This paper derives buckling solutions for single variable thick plate buckling problems using the double finite sine transform method (DFSTM). The problem governing partial differential ...  Read More ...