Engineering and Technology Journal

Enhancing of Crushed Brick Aggregate Concrete by Adding Alkalis

S.A. Hameed

Volume 35, 6A , June 2017, , Page 554-559

https://doi.org/10.30684/etj.35.6A.1

Abstract

The process of recycling the waste of construction materials increased in most countries in the world, because of the huge quantities of waste materials result from demolition that ... Read More ...

Mechanical Properties of High Strength Concrete Containing Different Cementitious Materials

Hisham K. Ahmed; Oday A. Abd

Volume 34, 1A , January 2016, , Page 96-110

https://doi.org/10.30684/etj.34.1A.9

Abstract

High strength concrete hasstrength significantly beyond what is used in normal practice. According to American Concrete Institute (ACI), high strength concrete revised the definition ... Read More ... High strength concrete hasstrength significantly beyond what is used in normal practice. According to American Concrete Institute (ACI), high strength concrete revised the definition to cover mixtures with specified design strength of 55 MPa or more. The main objective of this investigation isto study the effect of using different supplementary cementitious materials in binary blends on mechanical properties of high strength concrete. The experimental work includes threestages: firstly, preparation of cementitious materials (metakaolin and pumice) from local materials,second involves conducting several trial mixes to choose the best of superplasticizer that satisfies the required properties and to specify the optimum water content which is designed in laboratory by 0.3 W/Cm ratio, to achieve workability with (60-80mm) slump and the best compressive strength which was 64.6 at 28 days. Thirdly carrying out tests to find out the compressive strength, splitting tensile strength, modulus of rupture, on binary concretes including mixes containing silica fume as cement replacement at percentages of 8%, 10% and 15%, mixes containing metakaolin as cement replacement levels of 10%, 15%, and20% and mixes containing pumice at cement replacement of 10%, 15%, and 20%.These properieswere measured at ages ranging from7days to 180 days. The resultsindicate that the silica fume performs better than other supplementary cementitious materials(metakaolin or pumice) in terms of the compressive strength, splitting tensile strength and modulus of rupture development at ages of 7,28,60,90and180 days where the average percentage of increase when using 8%,10% and 15% ofsilica fume was about(19%,23% and 18.7%) ,respectively, while when using 10%,15% and 20%metakaolin the average percentage of increase was (10%,12.6% and 4%) respectively, also when using 10%,15% and 20% of pumice the average percentage of increase was (2.6%, 6% and 1.5%), respectively.

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 ...

Effect of Practical Curing Methods on the Properties of Roller Compacted Concrete

Hisham K. Ahmed; Intesar Kadhim Gata

Volume 33, 2A , February 2015, , Page 500-511

https://doi.org/10.30684/etj.33.2A.20

Abstract

Roller Compacted Concrete (RCC) is a technology characterized mainly by the use of rollers for compaction. This construction method permits considerable reduction in costs and construction ... Read More ...

Effect of Compaction Methods on the Properties of Roller Compacted Concrete

Hisham Khalid Ahmed; Azal Thair Abdulrazzak

Volume 32, Issue 10 , October 2014, , Page 2454-2464

https://doi.org/10.30684/etj.32.10A.10

Abstract

Roller compacted concrete (RCC) is a technology characterized mainly use of roller for compaction. This construction method permits considerable reduction in costs and construction ... Read More ...

Mechanical Properties of High-Strength Fiber Reinforced Concrete

Zaid Muhammad Kani Al-Azzawi; Kaiss Sarsam

Volume 28, Issue 12 , June 2010, , Page 2442-2453

https://doi.org/10.30684/etj.28.12.13

Abstract

Experimental results of this work in addition to a wide range of data from previous workwere analyzed to study the mechanical properties and strength of high-strength concrete with ... Read More ...

Using Citric Acid As An Admixture and It's Influence on Some Properties of Concrete

Wasan I. Khalil

Volume 27, Issue 1 , January 2009, , Page 32-41

https://doi.org/10.30684/etj.27.1.3

Abstract

The objective of this investigation is to find the effectiveness of the citric acid asretarding admixture. The experimental results indicate that the optimum dosage of citricacid is ... Read More ...

Keywords = Modulus of rupture

Enhancing of Crushed Brick Aggregate Concrete by Adding Alkalis

Abstract

Mechanical Properties of High Strength Concrete Containing Different Cementitious Materials

Abstract

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

Abstract

Effect of Practical Curing Methods on the Properties of Roller Compacted Concrete

Abstract

Effect of Compaction Methods on the Properties of Roller Compacted Concrete

Abstract

Mechanical Properties of High-Strength Fiber Reinforced Concrete

Abstract

Using Citric Acid As An Admixture and It's Influence on Some Properties of Concrete

Abstract