Engineering and Technology Journal

Prediction of Fresh and Hardened Properties of Concrete Containing Nanostructured Cassava Peel Ash Using Ibearugbulem's Approach

Chidobere D. Nwa-David; David O. Onwuka; Fidelis C. Njoku; Owus M. Ibearugbulem

Volume 41, Issue 5 , May 2023, , Page 652-665

https://doi.org/10.30684/etj.2023.138099.1374

Abstract

Statistical methods such as Scheffe’s and Osadebe’s models are commonly employed for the optimization of concrete properties. Despite their prediction suitability, attention ... Read More ...

Optimization of Silica Fume and Slag in Roller Compacted Concrete by Taguchi Method

Ziyad M. Abed; Hisham K. Ahmed; Wasan I. Khalil

Volume 41, Issue 5 , May 2023, , Page 724-733

https://doi.org/10.30684/etj.2023.138600.1411

Abstract

Roller Compacted Concrete Pavement (RCCP) is one type of concrete poured and compacted with the same machines utilized to construct heavy-duty pavements, log sorting, and parking. In ... Read More ...

Nonlinear 3D Finite Element Model for Round Composite Columns under Various Eccentricity Loads

Dara A. Mawlood; Serwan K. Rafiq

Volume 40, Issue 11 , November 2022, , Page 1605-1614

https://doi.org/10.30684/etj.2022.133106.1168

Abstract

Composite columns are often used in constructing high-rise structures because they can reduce the size of a building's columns while increasing the usable area in the floor plan. This ... Read More ...

Effect of domestic dry sewage sludge on concrete compressive strength

Alaa R. Al-Obaidi; Riyad H. Al-Anbari; maan S. hassan

Volume 40, Issue 5 , May 2022, , Page 832-839

https://doi.org/10.30684/etj.2021.131284.1022

Abstract

The possibility of saving and sustaining natural materials by reusing waste is one of the most important goals researchers seek to achieve and prove its effectiveness and positive impact ... Read More ...

The Effect of Process Parameters on the Compression Property of Acrylonitrile Butadiene Styrene Produced by 3D Printer

Sabreen A. Oudah; Hind B. Al-Attraqchi; Nassir A. Nassir

Volume 40, Issue 1 , January 2022, , Page 189-194

https://doi.org/10.30684/etj.v40i1.2118

Abstract

Additive manufacturing (AM) by Fused Deposition Modelling (FDM) provides an innovative manufacturing method for complex geometry components. 3D printers have become easily accessible ... Read More ...

Effect of Adding Polypropylene Fibers in Met kaolin-Based Geopolymer Concrete

Qais J. Frieh; Mushtaq H. Kamil

Volume 39, Issue 12 , December 2021, , Page 1814-1820

https://doi.org/10.30684/etj.v39i12.2224

Abstract

Geopolymer is a binder material that was created as a result of efforts to decrease Portland cement's negative environmental effects. Geopolymer concrete shares certain properties ... Read More ...

Effect of Inclination of Rectangular Reinforced Concrete Short Columns on the Confinement

Eyad K. Sayhood; Bassman R. Muhammed; Ahmed A. Hatem

Volume 39, Issue 12 , December 2021, , Page 1821-1827

https://doi.org/10.30684/etj.v39i12.437

Abstract

The main objective of this paper is to study the confinement of the rectangular reinforced concrete short inclined columns. This paper was based on theoretical analysis using the MATLAB ... Read More ...

Optimum Steel Fiber Content of High Strength Pozzolime Concrete

Sabreen M. Hamza; Ahmed Sh. J. Al-Zuheriy; Sabreen M. Hamza

Volume 39, Issue 12 , December 2021, , Page 1869-1874

https://doi.org/10.30684/etj.v39i12.2213

Abstract

Pozzolime is a promising alternative binder, compared to Portland cement because of its low CO2 emission. it is produced by mixing hydrated lime, silica fume, and fly ash. Fiber is ... Read More ...

Effect of Using Windows Waste Glass as Coarse Aggregate on Some Properties of Concrete

Abdelmaseeh Bakos Keryou; Gailan Jibrael Ibrahim

Volume 32, Issue 6 , July 2014, , Page 1519-1529

https://doi.org/10.30684/etj.32.6A.14

Abstract

In this experimental study, local waste glass (WG) gathered from Turkey-made windows glass has been used as a partial replacement of coarse aggregates with 0, 20, 25, and 30% percentages ... Read More ...

Effect of Rubber Treated by Acidic Solution On Some Mechanical Properties of Rubberize Cement Mortar

Aziz Ibrahim Abdulla; Salwa Hadi Ahmed

Volume 29, Issue 13 , September 2011, , Page 2793-2806

https://doi.org/10.30684/etj.29.13.17

Abstract

In the present work, the properties of rubberize cement mortar containingcrumb rubber treated by acidic solution are tested and compared with normal rubberize and normal cement mortar.The ... Read More ...

One Parameter Composite Semigroups of Linear Bounded Operators in Strong Operator Topology of Schatten Class Cp

Samir Kasim Hassan; Al-Taie M; Al-Malki Anam; Al-Attar Abeer; Mustafa Khaleel Ismael; Fatema Ahmed Sadeq; Radhi A .Zboon; Jehad R.Kider; Samir K .Hassan; Hussain J. M. Alalkawi; Raad H. Majid; Rawaa A. Alomairy; Luma Abdul Ghani Zghair; Hadia Kadhim J.Al-Ogili; Assifa M. Mohamad; Abbas Sheyaa Alwan; Haider L. Aneed; Assim H Yousif; Salema Sultan Salman; Abbas Hussien Miry; Abduladhem A.Ali; Mohammed Zeki Al-Faiz; Sabah N. mahmood; Khansaa Dawood Selman; Shaymaa Tareq Kadhim

Volume 29, Issue 8 , June 2011, , Page 1463-1470

https://doi.org/10.30684/ etj.29.8.2

Abstract

For semigroups of linear bounded operators on Hilbert spaces, the problem of being in Cp , 0 Keywords Read More ...

Behavior of Plain and High Performance Polypropylene Fiber Concrete Subjected to Elevated Temperatures

Luma Abdul Ghani Zghair

Volume 29, Issue 8 , June 2011, , Page 1517-1535

https://doi.org/10.30684/ etj.29.8.8

Abstract

The aim of this work is to determine the residual compressive strength and splitting tensile strength after exposure to an elevated temperature (between100 to 500 C ◌ْ ) of plain ... Read More ... The aim of this work is to determine the residual compressive strength and splitting tensile strength after exposure to an elevated temperature (between100 to 500 C ◌ْ ) of plain and polypropylene fiber reinforced concrete (PPFRC) in comparison with specimens exposed to ordinary temperature 25C ◌ْ . High – performance concrete mixes were produced by using high rang reducing agent superplasticizer (SP) and 10% high reactivity metakaoline (HRM) as a partial replacement by weight of cement (350)Kg/m3 . A single concrete mix with HRM, SP and four PPF contents of (0.25, o.5, o.75 and 1%) by volume were adopted. The workability of the concrete was kept constant ( slump 100 ± 5mm ).Each group of specimens ( plain and PPFRC ) was heated to a specified temperature and kept at the temperature for one hour before being gradually cooled to room temperature and then they were tested . The results show at ordinary temperatures 25 C ◌ْ, the addition of fiber volume fraction (VF%) of (0.25%) increases the compressive ( 20.6% ) comparable to HPC without fiber . While the addition of ( 0.5 , 0.75 and 1% ) of polymer fibers , the compressive strength decreased (12.6 , 19 and 33%) respectively comparable to HPC without fiber . On the other hand the addition of (VF%) of (0.25) increased splitting tensile strength ( 15%) comparable to HPC without fiber . while the addition of fiber volume fraction (VF%) of (0.5 ) increased splitting tensile strength by a percentage which is lower than that in specimens with VF% of 0.25 , the increase in splitting tensile strength was ( 6%) comparable to HPC without fiber at ordinary temperatures The results also shows that , when (1% ) fibers was used , the splitting tensile strength decreased ( 10.8%) in comparable to HPC without fiber At elevated temperature the results show an appreciable decrease in compressive strength and splitting tensile strength after exposure to temperature higher than 300 C ◌ْ of both plain and PPFRC Specimens containing PPF ( 0.25 , 0.5 , and 0.75 %) the percentage of reduction in splitting tensile strength is lower than that in HPC specimens ( without fibers ) after exposure to a temperature ( 500 ,300 and 100 C ◌ْ ) comparable to normal temperature 25C ◌ْ .While specimen containing PPF ( 1% ) the percentage of reduction in splitting tensile strength was higher than specimen without PPF after exposure to a similar temperature .On the other hand , specimens containing PPF ( 0.25 , 0.5 , 0.75 and 1 %) the percentage of reduction in compressive strength is higher than that in HPC specimens ( without fibers ) after exposure to a temperature (500 ,300 and 100 C ◌ْ). comparable to normal temperature 25C ◌ْ

Mechanical Strength of Silicon Carbide Bonded with Iraqi Clays

Abdul Mutalb Al Sheikh; Shihab Ahmed Zaidan Al- Juboori; Kassim S. Kassim

Volume 29, Issue 4 , March 2011, , Page 665-676

https://doi.org/10.30684/ etj.29.4.3

Abstract

Two types of Iraqi clays (Kaolin and Bentonite) were used in bonding process with different weight percentage (5%, 10%, 15%, 20%, and 25%) and with different particle size from clays ... Read More ...

Impact Resistance of Lightweight Chopped Worn-Out Tires Concrete

Zaid M. K. Al-Azzawi; Dhafir T. F. Al-Khameesi

Volume 28, Issue 16 , August 2010, , Page 5200-5212

https://doi.org/10.30684/etj.28.16.6

Abstract

This study summarizes results of an experimental investigation of theimpact resistance of 12 lightweight concrete slabs made from incorporating chopped worn-out tires (Ch.W.T.) into ... 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 ...

The Production of Self-Compacting Concrete with Normal Cement Content

Luma A. G. Al- Rawi; Tariq S. Al-Attar; Shakir A. Al-Mishhadani

Volume 27, Issue 2 , January 2009, , Page 310-320

https://doi.org/10.30684/etj.27.2.9

Abstract

The main object of this work is to evaluate the possibility for using reasonable cementcontent and fine materials to reduce costs of expensive chemical admixtures needed for themanufacturing ... Read More ...

Keywords = Compressive Strength

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