Journal of Engineering

1

Experimental Investigation of Crack Initiation and Growth in Concrete Slabs Placed Directly on Clayey Soil

Ahmed Assim Abdullah, Hanifi Çanakcı

Pages: 1-17 English

Abstract

This study examines the impact of moisture content in clayey soil on the mechanical properties of concrete slabs placed directly on it. Tests were conducted on soil-concrete specimens with varying moisture content (0% to 35%) and exposed to sprayed water curing conditions for 28 days. The study assessed compressive strength, ultrasonic pulse velocity, crack depth, and crack width. Results showed a 26% increase in compressive strength with increasing moisture content, while ultrasonic pulse velocity decreased by 58%. Crack depth was highest and crack width lowest at 0% moisture content due to increased water absorption by dry soil. The findings highlight the critical role of soil moisture content in controlling concrete cracking and its implications for crack growth.

Keywords

Clayey soil compressive strength concrete slabs crack growth crack initiation Moisture Content ultrasonic pulse velocity

2

Assessment of Thermal Pollution at Selected Stretch of Tigris River in Baghdad by Field Observations and Numerical Simulations

N.S. Mahumood, T.A. Mohammad

Pages: 18-34 English

Full Text Issues

Abstract

This study assesses the impact of thermal pollution from the Al Dora thermal power plant on a stretch of the Tigris River in Baghdad. Field measurements of the temperature of disposed hot water were taken in various cross-sections during winter, spring, and summer. The thermal mixing length was also measured. The impact of thermal pollution was simulated using the CFD COMSOL model. The results showed that the recovery distances were 1500 m in winter, 1810 m in spring, and 2450 m in summer. Reducing the velocity of the hot water from 1.6 to 0.5 m/s improved thermal mixing. Dissolved oxygen concentrations ranged from 6.9 to 10.7 mg/l, which is above the critical concentration of 5 mg/l required for aquatic life.

Keywords

CFD COMSOL Dissolved oxygen concentrations Field measurement Simulation Thermal pollution Tigris River

3

Hazard analysis in drinking water plant

Mariam Salih Issa, Khalid Adel Abdulrazzaq

Pages: 35-44 English

Full Text Issues

Abstract

This study focuses on the hazard analysis of a drinking water plant, identifying potential risks and assessing pollution at each stage of the water treatment process. The process includes source, sedimentation, coagulation, flocculation, filtration, and storage. Laboratory tests for physical, chemical, and biological parameters are conducted to ensure the water meets specific standards and regulations. The goal is to maintain safe drinking water by monitoring and mitigating risks throughout the plant.

Keywords

Drinking water plant Hazard analysis HIRA risk assessment Water quality

4

Design and Implementation of Active Noise Cancellation for Car Cabin on Sulaimania Roads Using Arduino Embedded System

Aven R. Hamza, Mohammed Abdullah Hussein Shiekh

Pages: 45-69 English

Full Text Issues

Abstract

This study focuses on reducing noise inside car cabins, particularly from tires, engines, and outside winds, using Active Noise Cancellation (ANC). The research utilizes an Arduino embedded system to implement a cost-effective digital ANC solution. The study tested three types of road roughness (low, medium, and high) and achieved noise cancellation ranging from 10 to 12 dB. The results demonstrate the potential of using low-cost processors like Arduino for effective noise reduction in budget cars.

Keywords

Active Noise Cancellation Arduino Car Cabin Road Noise signal processing

5

Methods for Removing Dyes from Polluted Water; A Review

Safa Abdulrazak Hardan, Sura Kareem Ali

Pages: 70-85 English

Full Text Issues

Abstract

This review explores various methods for removing dyes from polluted water, focusing on techniques such as sorption, oxidation, coagulation, filtration, and biodegradation. Other methods include chlorination, ozonation, chemical precipitation, adsorption, electrochemical processes, membrane approaches, and biological treatment. The paper highlights the effectiveness of these methods in treating wastewater from industries like textiles and wool, which are major sources of dye pollution. The review also categorizes dyes into natural and synthetic types, discussing the specific challenges and solutions for each.

Keywords

color Dyes Polluted removing water

6

Properties of Roller-Compacted Concrete Pavement Containing Different Waste Material Fillers

Anwer M. Ali, Zena K. Abbas

Pages: 86-106 English

Full Text Issues

Abstract

This study investigates the impact of using various waste materials (brick, thermostone, granite, and ceramic powders) as fillers in roller-compacted concrete pavement (RCCP). The waste materials were crushed, ground, and blended before being used as fillers in the RCCP. The study evaluated the mechanical properties, including compressive strength, splitting tensile strength, flexural strength, water absorption, density, and porosity. Results showed that brick and granite powders enhanced the mechanical properties due to their pozzolanic activity and filler effect. Ceramic powder also provided satisfactory results, while thermostone powder led to a reduction in mechanical properties.

Keywords

recycled powder Roller compacted concrete sustainable concrete pavement Waste Materials

Articles in This Issue

Experimental Investigation of Crack Initiation and Growth in Concrete Slabs Placed Directly on Clayey Soil

Abstract

Keywords

Assessment of Thermal Pollution at Selected Stretch of Tigris River in Baghdad by Field Observations and Numerical Simulations

Abstract

Keywords

Hazard analysis in drinking water plant

Abstract

Keywords

Design and Implementation of Active Noise Cancellation for Car Cabin on Sulaimania Roads Using Arduino Embedded System

Abstract

Keywords

Methods for Removing Dyes from Polluted Water; A Review

Abstract

Keywords

Properties of Roller-Compacted Concrete Pavement Containing Different Waste Material Fillers

Abstract

Keywords