MSC

Sep 15, 2012 - May 4, 2014

asst proof mohammed hazim yaseen

Effect of wetting and drying cycles on strength behavior of roller compacted concrete

Jan 26, 2025

Journal Innovative Infrastructure Solutions

DOI https://doi.org/10.1007/s41062-025-01899-x

The paper addresses the environmental and economic concerns associated with the depletion of natural resources and the increase in construction and demolition waste. It explores the potential of recycling concrete debris into new concrete mixtures as a sustainable approach in the construction sector. The research focuses on the durability performance of green concrete, specifically roller compacted concrete (RCC), when exposed to alternating wet and dry cycles. The study involves using materials like glass powder, brick powder, steel slag, and polyethylene terephthalate (PET) as partial replacements for cement in concrete production. Results indicate that a mixture containing 1% PET showed a maximum increase in split tensile strength by 62.9% compared to reference mixtures at all ages. This mixture also demonstrated better performance under wet and dry cycles compared to the reference mixture, suggesting improved durability.

Mechanical properties and microstructure of roller compacted concrete incorporating brick powder, glass powder, and steel slag

Jan 15, 2024

Journal Journal of the Mechanical Behavior of Materials

DOI https://www.degruyterbrill.com/document/doi/10.1515/jmbm-2022-0307/html

The objective of this study is to explore the feasibility of developing environmentally friendly green rollercompacted concrete (RCC) by utilizing locally available materials. The research investigates the behavior of RCC properties when different amounts of solid waste materials (brick powder, glass powder, and steel slag) are added as substitutes for cement content. To accomplish this, four laboratory tests were conducted: compressive strength, flexural strength, X-ray diffraction analysis, and scanning electron microscope imaging. These tests aimed to identify the changes in concrete properties resulting from the inclusion of waste construction materials as cement replacements. The study employed an approach that involved adding waste materials to the concrete mixture, with replacement percentages ranging from 10.0 to 40.0% in increments of 10.0%. Consequently, 12 concrete mixtures were prepared to examine the effects of adding waste materials (10.0–40.0%) as substitutes for cement content. In addition, one reference mixture was designed without any inclusion of waste materials for comparison purposes. In general, the results indicate that as the percentage of waste construction materials increases in the mixtures, there is a corresponding decrease in compressive strength. However, it is noteworthy that the strength activity index (SAI) exceeded 75% according to ASTM C618 standards. This indicates that the waste construction materials possess pozzolanic properties, making them suitable for use as cement replacements in RCC mixtures.

Effect of Polyethylene Terephthalate (PET) in Development of Green Roller Compacted Concrete

Oct 27, 2023

Journal Construction Technologies and Architecture

DOI doi:10.4028/p-C6l8Ag

Volume 10

This paper aims to find out the possibility of development Green Roller-Compacted Concrete (RCC) by using local materials and study the behavior of RCC properties by adding different amounts of solid waste (Polyethylene Terephthalate (PET) as volume fraction of cement content). To achieve this aims; Three laboratory tests were applied; Density, Compressive strength, and Flexural strength, that conducted to show the changes in the properties of concrete with existence of PET in the mixture. an approach for adding the PET in the concrete mixture. ranging from 1.0 % to 3.0 % with the variation of 1.0 %. Therefore, Three concrete mixtures was prepared to study the affect of adding (1.0 – 3.0 ) % of PET as volume fraction of cement content. On the other hand, one additional mixture designed without any inclusion of PET to be considered as a reference mixture. It can be observed in general from of the results that the increase in the percentage of Polyethylene Terephthalate (PET) in the mix leads to decrease in the compressive strength to 15 %. Results show that The use of Polyethylene Terephthalate (PET) would enhance the flexural strength of LWAC to 69.4 %.

Comparison of reactive powder concrete properties exposed to seawater and sulfuric acid

Jul 14, 2023

Journal AIP Conference

DOI https://doi.org/10.1063/5.0148155

Utilization of hybrid fibers in different types of concrete and their activity

Oct 10, 2022

Journal Journal of the Mechanical Behavior of Materials

DOI https://doi.org/10.1515/jmbm-2022-0262

In this work, the influence of using hybrid fibers on the mechanical properties of two types of concrete: high-strength concrete (HSC) and lightweight concrete (LWC) was studied. Using hybrid fibers instead of using only one type reduced the negative effect on concrete mechanical performance. The glass fiber (GF) and polypropylene fiber (PPF) were used in different contents ranged from 0.2 to 1% as weight % of binder content. Moreover, combinations of both fibers “GF + PPF” were used in contents % of “0.3 + 0.5%,” “0.5 + 0.5%,” “0.3 + 1%,” and “0.5 + 1%.” LWC mixes were prepared by replacing 40% of the coarse aggregate of reference mix with volcanic material (pumice) as a volumetric replacing. To produce HSC, the water-to-cement ratio was reduced to 0.3, 10% silica fume was added, and 1% super plasticizer was used to obtain the consistency. Compressive strength, splitting strength, and flexural strength tests were carried out. The results showed that using 0.7% GF displayed the highest increases in compressive, splitting tensile, and flexural strength of HSC and LWC mixes. Furthermore, GF exhibited better performance and higher values in compressive, splitting tensile, and flexural strength tests in comparison with PPF. The optimum hybrid fiber content displaying the highest increment of all tested properties in both concrete types, HSC and LWC, was “0.5% GF + 0.5% PPF.”

Effect Dimensions and Shape of Specimens on Some Mechanical Properties of Concrete

Mar 8, 2021

Journal IOP Conference Series: Materials Science and Engineering

DOI doi:10.1088/1757-899X/1094/1/012011

Due to the effect of the structure element size on concrete's mechanical properties, larger concrete structures fail under lower stresses than smaller ones. Hence, the laboratory data need to re-evaluate and updated to establish structural design rules and safety regulations. From this standpoint, this research is concerned with studying the effect of dimensions and shapes on the concrete specimen under different amounts of super-plasticizer on the concrete properties. Cubes, prisms, and cylindrical specimens are prepared and subjected to four experimental tests: compressive strength, impact resistance, abrasion resistance, and flexural strength. Besides, four concrete admixtures prepared with different amounts of superplasticizer, 0.0, 0.50, 1.00, and 1.50 %, as a percentage of cement weight content, respectively. The obtained results from this research proved that both the highest thickness and superplasticizer dosage resulted in 910% increases in the impact strength and improved in the flexural strength by 56.5%. On the other hand, under all super-plasticizer dosages, an increase in compressive strength, flexural, and impact resistance has resulted. Finally, based on the obtained experimental records, the statistical analysis conducted to present basis formulations illustrated the effect of the dimensions and sizes of concrete specimens with super-plasticizer content on some concrete properties.

Comparison Mechanical Properties of Two Types of Light Weight Aggregate Concrete

May 3, 2019

Journal Civil Engineering Journal

Issue 5

Volume 5

This paper presents the behavior of concrete properties by replacing the conventional coarse aggregate used in the concrete mixture by two types of lightweight aggregate; Expanded Perlite Aggregate (EPA) and Volcanic Pumice (VP). To fulfill this aim; three laboratory tests were applied; density, compressive strength, and abrasion resistance, that conducted to extrapolate the range of the changes in the properties of concrete with existence those types of aggregate in the mixture. Also, the volumetric proportion adopted as a strategy for replacing the coarse aggregate by EPA or VP in the concrete mixture. Then, the volumetric proportion ranged from 10% to 50% with the variation step was 10%. Therefore, ten concrete mixtures are prepared and divided into two groups; each group contains five concrete mixes to represent the volumetric replacement (10-50)% of conventional coarse aggregate by EPA or VP. On the other hand, one extra mixture designed by using conventional aggregate (coarse and fine aggregate) without any inclusion of EPA or VP to be considered as a reference mixture. The obtained laboratory results of this study proved that the density, compressive strength, and abrasion resistance readings of concrete decreased at any volumetric proportion replacement of coarse aggregate by EPA or VP. The decrease in density and compressive strength of concrete readings amounted the peak level at 50% replacing of coarse aggregate by EPA, which were 38.19% and 77.37%, respectively than the reference mixture. Additionally, the compressive strength is an important factor affecting the abrasion resistance of concrete mixture, and loss of abrasion decreased as compressive strength increased.

INFLUENCE OF ADDING DIFFERENT AMOUNTS OF POLYETHYLENE TEREPHTHALATE ON THE MECHANICAL PROPERTIES OF GYPSUM SUBJECTED TO FIRE

Oct 1, 2018

Journal International Journal of Civil Engineering and Technology (IJCIET)

DOI http://www.iaeme.com/ijciet/issues.asp?JType=IJCIET&VType=9&IType=10

Issue 10

Volume 9

Four experimental laboratory mixtures were used to deal with the influence of adding different amounts of solid waste (PolyEthylene Terephthalate (PET)) on the mechanical properties (compressive strength, and modulus of rupture) of gypsumunder normal temperature (room temperature). Additionally, other samples of the same properties were exposed to high temperatures of 200°C, 400°C, and 600°C for two continuous hours to simulate the fire conditions at different temperatures, and studying the residual compressive strength of gypsum samples. In the current study, the laboratory mixtures including normal gypsum mixture G1 (without PET) as a reference mixture and the gypsum mixture (G2, G3, and G4) with different quantities of PET as 0.5 %, 1.0% and 1.5% volume fraction of gypsum respectively. Ninety-six standard cubes and also twenty-four standard prisms were prepared and tested to achieve the desired goal of this study. Laboratory testing shows, adding 1% of PET to gypsum at the age of seven days improved compressive strength 18.75%, the modulus of rupture was improved by 26.32% as compared to the reference mixture. On the other hand, the addition of 1.5% PET records the best resistance to fire comparing with all mixtures in different temperatures.

The Influence of Inclusion Volcanic Pumice On The Concrete Properties,

Sep 13, 2018

Journal Internationa Journal of Civil Engineering and Technology (IJCIET)

DOI http://www.iaeme.com/ijciet/issues.asp?JType=IJCIET&VType=9&IType=13

Influence of Mix Proportions on The Impact Resistance of High Strength Concrete

Apr 3, 2014

Journal Journal of Engineering and Development,

Issue 18

Volume 3

This research aim to study the Influence of mix proportions on the impact resistance of high strength concrete, Trial laboratory batches were used including as follows: - Normal concrete mixture (C1) as a reference mix ((w/c) = 0.45, without admixtures); - Four concrete mixtures (C2, C3, C4, C5) prepared by fixing (w/c) =0.45, and using different amount of super plasticizers (0.25, 0.50, 0.75, 1.00)% as a percentage of cement content, respectively; - Four concrete mixtures (C6, C7, C8, C9) prepared by reducing and fixing (w/c) = 0.30, and using silica fume = (15)% as replacement of cement content and different amount of superplasticizers (1.25, 1.50, 1.75, 2.00)% as a percentage of cement content; and - Three concrete mixtures (C10, C11, C12) prepared by fixing the amount of superplasticizers (1.50)% and using different (w/c) = (0.40, 0.29, 0.27). Results show that Mixture C11 prepared with (1.50%) addition of superplasticizers and (15%) addition of silica fume leads to (90.29%) increasing in the compressive strength and records an improvement in the impact resistance by (725.56%) as compared with the reference mix. On the other hand, all of the mix proportions lead to an increase in both compressive strength and impact resistance for all the mixes. Key words: Mix proportions, Impact Resistance, Compressive Strength, Superplasticizers, ACI 544, First-Crack Strength, Failure Strength.

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

Sep 5, 2013

Journal Eng. & Tech. Journal

Volume 32

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 impact resistance) of concrete. A series of five different concrete mixtures including: Normal concrete mixture C1 (without superp lasticizers) as a reference mix and four concrete mixtures (C2, C3, C4, and C5) with different amounts of superp lasticizers (0.25, 0.50, 0.75, and 1.00) % as a percentage of cement content, respectively. Results show that the (1.00)% addition of superp lasticizers in the concrete mixture leads to (19.84)% increasing in the compressive strength and records an improvement in the abrasion resistance by (38.06)% and recorded an improvement in the impact resistance by (386.67)% as compared with the reference mixture. On the other hand, increasing the percentages of superp lasticizers lead to increase in compressive strength, abrasion resistance and impact resistance for all concrete mixtures.