Engineering and Technology Journal

Properties of Self-Compacting Cementitious Composite Materials Containing Cement Kiln Dust Powder

Ahmed S. Kadhim; Alaa A. Atiyah; Shakir A. Salih

Volume 38, 6A , June 2020, , Page 879-886

https://doi.org/10.30684/etj.v38i6A.592

Abstract

This paper aims to investigate the influence of utilization micro cement kiln dust as a sustainable materials additive in order to reduce the voids and micro cracks in the cementitious ... Read More ...

Influence of Recycled Fine Aggregates on Strength Properties of Reactive Powder Mortar

Doaa H. Nayyef; Shatha S. Hasan

Volume 38, 3A , March 2020, , Page 288-294

https://doi.org/10.30684/etj.v38i3A.265

Abstract

Although many researchers have done many studies on recycled aggregate concrete, information is very little about the influence of utilizing recycled aggregate in the production of ... Read More ...

The Characterization and Modeling the Mechanical Properties of High Strength Concrete (HSC) Modified with Fly Ash (FA)

Saman M. Kamal; Jalal A. Saeed; Ahmed Mohammed

Volume 38, 2A , February 2020, , Page 173-184

https://doi.org/10.30684/etj.v38i2A.278

Abstract

One of the main challenges facing Civil Engineering community is to modify cement quantity in the mix design by admixtures to enhance the mechanical properties. According to more than ... Read More ...

Mechanical Properties of Cement Mortar Made with Black Tea Waste Ash as a Partial Replacement of Cement

Mohammed S. Nasr; Zaid A. Hasan; Mohammed K. Abed

Volume 37, 1C , April 2019, , Page 45-48

https://doi.org/10.30684/etj.37.1C.7

Abstract

Environmental pollution and the relatively high cost of waste disposal has been a major focus for scientists around the world, leading researchers to find a solution to reuse waste ... Read More ...

A Comparative Investigation on Mechanical Properties of Various Fibers Reinforced Concrete

Ahmed M. Al-Ghaban; Hussein A. Jaber; Aya A. Shaher

Volume 37, 1A , January 2019, , Page 28-36

https://doi.org/10.30684/etj.37.1A.5

Abstract

The present work presents an investigation the effect of adding various fiber materials such as (glass, nylon, and carbon) into the concrete mix for inspecting and compare the mechanical ... Read More ...

Production of Lightweight Clay Bricks Using Polymer Wastes

basil salah mohammed; Sadiq N. Al-Ebrahimy

Volume 36, 8A , August 2018, , Page 823-831

https://doi.org/10.30684/etj.36.8A.1

Abstract

In this study, different percentages (2, 4, 6, 8, and 10% by weight of the soil) of chopped polymeric (plastic bottles with maximum particle size 2.36 mm and 1.18 mm in addition to ... Read More ... In this study, different percentages (2, 4, 6, 8, and 10% by weight of the soil) of chopped polymeric (plastic bottles with maximum particle size 2.36 mm and 1.18 mm in addition to rubber tires of 0.6 mm max particle size) wastes are incorporated with soil to produce lightweight clay bricks, to find the optimum percentage satisfying the requirements of bricks grade C using for non-structural walls (partitions).The effects of different types and percentages of the polymeric wastes on firing shrinkage, density, water absorption, compressive strength and thermal conductivity of the fired bricks were studied. Results indicate that it is possible to incorporate not more than 8% of chopped rubber tires or not more than 6% of chopped bottles to the clay soil to produce lightweight fired clay bricks satisfying the compressive strength and water absorption requirements for grade C of bricks (used for partitions) according to the Iraqi specification IQS 25/1988, in addition to reducing the thermal conductivity by 13-17% which is desirable as it will reduce the energy required for heating and cooling. Also, found that the size of the incorporated particles of plastic wastes in clay, used for bricks manufacturing, did not have a significant effect on the different studied properties of bricks. In addition to, the incorporation of chopped rubber tires, having smaller particles size and more sphere particles shape, produce fired clay bricks with more homogeneous pores distribution and smaller size compared with clay brick incorporating chopped plastic wastes having flaky shape and larger particles size, leading to produce clay brick with higher density and strength, with lower water absorption. As a total results, the incorporation different types of polymeric wastes (chopped plastic bottles with 2.36 and 1.18 max size and chopped rubber tires) with percentages (2, 4, 6, 8, and 10% by weight of soil) , cause the firing shrinkage and water absorption to increase by (0.6-20.2%) and (3-43.5%) respectively, while the density, compressive strength, and thermal conductivity decrease by (3.5-25.1%), (0.4-2.3%), and (2.1-31.9%) respectively with respect to the reference fired clay bricks, depending on the percentage, particles size, and type of the polymeric wastes addition.

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 ...

Shear Strength of Concrete Deep Beam Subjected to Uniformly Distributed Load

Eyal K. Sayhood; Ali S. Resheq; Ayad J. Habeeb

Volume 36, 2A , February 2018, , Page 125-135

https://doi.org/10.30684/etj.36.2A.3

Abstract

In this paper, result of tests on 20 simply supported concrete deep beams are presented. All tested beams have dimensions of (150 x 400 x 1100) mm and tested under (1, 2, 4 and 8) point ... Read More ...

Studying the Effect of Adding Marble and Porcelain Waste on Mechanical Properties of Concrete Containing Recycled Aggregate

A.S. AL-Luhybi

Volume 35, 7A , July 2017, , Page 668-674

https://doi.org/10.30684/etj.35.7A.1

Abstract

In this research an experimental study was carried out to investigate the effect of adding marble and porcelain waste as replacement of sand by certain percentages on mechanical properties ... Read More ...

Some Properties of No-Fines Concrete Produced by Using Demolished Concrete as Recycled Coarse Aggregate

Sh. A. Salih; I.N. Gorgis; W.F. Abd

Volume 35, 7A , July 2017, , Page 741-748

https://doi.org/10.30684/etj.35.7A.10

Abstract

This paper investigate some mechanical properties of no-fines concrete produced by using demolished concrete as coarse aggregate after crushing to different sizes. Different no-fine ... Read More ...

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 ...

Study the Effects of Nano-Materials Addition on Some Mechanical Properties of Cement Mortar

F.A. Rasin; L.K. Abbas; M.J. Kadhim

Volume 35, 4A , April 2017, , Page 348-355

https://doi.org/10.30684/etj.35.4A.6

Abstract

This research involves nano-materials addition and interaction with cement mortar behavior for many mortar samples under variable curing time with constant water to cement ratio (W/C ... Read More ...

Effect of Accelerated Weathering on the Compressive Strength for PMMA Nano Composites and PMMA Hybrids Nano Composites Used in Dental Applications

S.I. Salih; J.K. Oleiwi; A.M. Talia

Volume 35, 3A , March 2017, , Page 204-215

https://doi.org/10.30684/etj.35.3A.4

Abstract

In the present research, efforts are made to develop the properties of PMMA resin that used for upper and lower prosthesis complete denture, by addition four different types of nanoparticles ... Read More ...

Mechanical Properties of Fiberous High Performance Lightweight Aggregate Concrete

H.K. Ahmed; W.I. Khalil; M.D. Subhi

Volume 35, 3A , March 2017, , Page 229-238

https://doi.org/10.30684/etj.35.3A.7

Abstract

Structural lightweight aggregate concrete solves weight and durability problems in buildings and structures. Recent advanced in material technology have accelerated the development ... Read More ...

Pozzolanic Activity and Compressive Strength of Concrete Incorporated nano/micro Silica

Mohammed S.Nasr; Shakir A. Salih; Maan S. Hassan

Volume 34, 3A , March 2016, , Page 483-496

https://doi.org/10.30684/etj.34.3A.5

Abstract

This paper aims to give a recommendation about the suitable nano silica proportion and curing method for testing its strength pozzolonic activity, in addition to suggest a mixing or ... Read More ...

Influence of Incorporating Construction Building Demolition as Recycled Aggregate on Concrete Behavior

Shatha Sadiq Hussen

Volume 34, 1A , January 2016, , Page 33-49

https://doi.org/10.30684/etj.34.1A.4

Abstract

Because of increasing waste production and public concerns about the environment, it is desirable to recycle materials from construction and building demolition. This study aimed to ... 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.

Influence of Adding Different Amounts of Super Plasticizers on the Mechanical Properties of Concrete (Impact and Abrasion)

Ali Hussain Ali; Mohammed Hazim Yasin

Volume 32, Issue 2 , February 2014, , Page 530-550

https://doi.org/10.30684/etj.32.2A.17

Abstract

Trial laboratory batches were used to study the effect of adding different amounts of superp lasticizers on the mechanical properties (Compressive strength, abrasion resistance, and ... Read More ...

Evaluation of Mechanical Properties of Roller Compacted Concrete

Mohamed Abdul-Razzaq Ahmed; Hisham K.Ahmed

Volume 32, Issue 2 , February 2014, , Page 551-572

https://doi.org/10.30684/etj.32.2A.18

Abstract

The main aim of this research is to study the effect of using the additive materials (hydrated lime and metakaolin) on the behavior of roller compacted concrete. The experimental work ... Read More ...

Keywords = Compressive Strength

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