Engineering and Technology Journal

Mechanical Properties Prediction of Normal and High Strength Geopolymer Concrete

Sameh B. Tobeia; Nada S. Assi; Narjis S. Abbas

Volume 39, Issue 12 , December 2021, , Page 1781-1788

https://doi.org/10.30684/etj.v39i12.1984

Abstract

The production process of cement is the main binder material in concrete usually accompanied by carbon dioxide emission. Therefore, geopolymer concrete (GPC) an alternative binder material ... Read More ...

Study of the Mechanical Properties of Jute Fiber Reinforced Cement Composites

Lamees S. Faiq

Volume 36, 12A , December 2018, , Page 1244-1248

https://doi.org/10.30684/etj.36.12A.5

Abstract

The study results show the use of jute fibers to develop a low cost material for wall panels, roofs and other construction board. The study has been investigates the cement mechanical ... 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 ...

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 ...

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 ...

An Experimental Investigation into theMechanical Properties of New Natural Fiber Reinforced Mortar

Sinan Abdulkhaleq Yaseen

Volume 31, Issue 10 , July 2013, , Page 1870-1881

https://doi.org/10.30684/etj.31.10A5

Abstract

Since the starting the 21st century, there is an increased awareness that non-renewable resources are becoming scarce, and dependence on renewable resources is growing. The 21st century ... 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 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 ...

Effect of Coarse Aggregate Characteristics on Drying Shrinkage of Concrete

Tareq Salih Al-Attar

Volume 26, Issue 2 , February 2008, , Page 146-153

https://doi.org/10.30684/etj.26.2.4

Abstract

Concrete is a composite material, consisting, mainly, of three phases: coarseaggregate, cement mortar, and the interface zone between them. The characteristicsof the interface zone ... Read More ...

Keywords = splitting tensile strength

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