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 ...

Relationships between Actual Compressive Strength, Modulus of Elasticity and Non-Destructive Tests of High Strength Concrete

Jasim M. Abd

Volume 36, 2A , February 2018, , Page 117-124

https://doi.org/10.30684/etj.36.2A.2

Abstract

The present research investigate with Nondestructive testing (NDT) of high strength concrete (HSC). An experiential work was carried out including both destructive and nondestructive ... 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.

Keywords = High Strength Concrete

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

Abstract

Relationships between Actual Compressive Strength, Modulus of Elasticity and Non-Destructive Tests of High Strength Concrete

Abstract

Mechanical Properties of High Strength Concrete Containing Different Cementitious Materials

Abstract