Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Physical Properties

Investigating the Effect of Different Parameters on Physical Properties of Metakaolin-Based Geopolymers

Ahmed J. Abed AL-Jabar; Hanna A. Al-Kaisy; Sarmad I. Ibrahim

Engineering and Technology Journal, 2022, Volume 40, Issue 12, Pages 1-10
DOI: 10.30684/etj.2022.132691.1138

Recently, geopolymers have received widespread attention due to their ability to completely replace ordinary cement with better efficiency, lower cost, and less damage to the climatic environment. This paper aimed to prepare MK-based geopolymer cement at ambient temperature with different alkaline activators and processing parameters. XRD, PSA, DTA-TGA, SEM, and other techniques have characterized the prepared samples. ANOVA test was employed to identify the main effect of the processing parameters. Results showed that the incorporation of potassium ions has a negative effect on the physical properties of GP, in which the presence of such ions tends to decrease the density of GP. Furthermore, the apparent porosity and water absorption were increased. For Na and K, Na-activated GP, it was also concluded that the density of GP increases by increasing Si/Al ratios. Despite the Na-based GP processes having a larger density in compared to the K, Na-based ones. The results also suggested a strong effect of the W\MK ratio on physical properties, in which decreasing this ratio is necessary to achieve GP with better properties. The findings also revealed that a one-minute mixing period was sufficient for producing a homogeneous and dense GP paste.

Improving the Properties of Main Drainage Water by Using of Magnetic Field Technique

Olla H. Kareem; Abdul Hameed M.J. Al-Obaidy; Riyad H. Al-Anbari

Engineering and Technology Journal, 2019, Volume 37, Issue 6A, Pages 195-200
DOI: 10.30684/etj.37.6A.2

In this research, main drainage channel treated by using a magnetic field with a density of (6000 Guesses). The general drain water samples flowed through the magnetic field with three levels of treatment (5 minutes, 15 minutes and 30 minutes) depending on the contact time. After treatment, it was found that the magnetic field works to improve more than ten physical and chemical properties of water. Essentially, Magnetic treatment has had a significant effect on the high salt content found in general drain water samples as it has been reduced and converted into simpler compounds. In addition, the magnetic field has an important role in increase the percentage of dissolved oxygen in water.

Optimization Using Taguchi Method for Physical and Mechanical Properties of Bio Mimicking Polymeric Matrix Composite for Orthodontic Application

Jenan S. Kashan

Engineering and Technology Journal, 2019, Volume 37, Issue 5A, Pages 181-187
DOI: 10.30684/etj.37.5A.5

This work take in consideration the application of Taguchi optimization methodology in optimizing the parameters for processing (composition, compounding pressure) and their effects on the output physical (Density and true porosity) properties and mechanical(fracture strength and microhardness) properties for the Nano HA,Al2O3 fillers reinforced HDPE hybrid composite material for orthodontic application. An orthogonal array of the Taguchi approach was used to analyses the effect of the processing parameters on the physical and mechanical properties. On the other hand, the surface roughness and particle size distribution were also calculated to study their effect on the output properties. The result shows that the Taguchi approach can determine the best combination of processing parameters that can provide the optimal physical and mechanical conditions, which are the optimum values (the optimum composition was15HA/ 5Al2O3/80HDPE, and optimum compounding pressure was102 MPa.

Physical Properties Study on Ti-C/Nano-Ceramics Composite

Ahmed M. Al-Ghaban; Niveen J. Abdulkader; Hadeel A. Al baiaty

Engineering and Technology Journal, 2018, Volume 36, Issue 11A, Pages 1185-1188
DOI: 10.30684/etj.36.11A.8

The effect of introducing Al2O3 and CuO nano particles on the physical properties of sintered Ti-C based materials has been studied. Titanium and carbon elemental powders have been mixed with nanoparticles of Al2O3 and CuO to produce composites of Ti-C/ceramics at 1100 °C. The XRD results show that for different amount of mixed nanoparticles, TiC, TiO2, and some rest of the reacted powders are the most dominant stable phases. In terms of physical properties, the results show that the raised Al2O3 percentage leads to gradually increase in apparent density of the sintered mixture as compared with the purely prepared TiC. Moreover, porosity and water absorption decrease with increasing Al2O3 percentage. On the other side, adding CuO to the sintered mixture causes in decreasing the apparent density. Furthermore, it was observed that CuO creates much porosity and increase water absorption of the sintered mixture.

Fine Aggregate Ratios Effect on Mechanical and Physical Properties of Pervious Concrete

Muyasser Mohammed Jomaa; Mohammed Sabah Irhayyim

Engineering and Technology Journal, 2016, Volume 34, Issue 9, Pages 246-260

The porous concrete applications and the process of production in different ways depending on the replacement of fine or coarse aggregate components of research important topics, The study dealt with production pervious concrete by depending on normal concrete by removing fine aggregate by four percentage by weight (25%, 50%, 75%, 100%), as was the work of trail mixtures of concrete for a reference mix of were depended mixture the weight [1:1.5:3] with a ratio (W/C) is equal to (0.40), which recorded the highest compressive strength of age (7) days, by the results tests show that the increased rate of removal of fine aggregate contributed to reduce the strength and density with the increase in porosity and permeability and absorption, as less density obtained is (1756.2)kg/m3 remove the fine aggregate by (100%), which gives less strength to compressive (14.28)MPa and the highest value for porosity (24.81%), as were better strength to compressive, splitting tensile, and bending are (36.77MPa, 4.28MPa, 4.4MPa), respectively to the proportion of removing fine aggregate (25%) compared to the reference mixture.

Enhancing Thermal and Water Absorption Properties of Unsaturated Polyester and Epoxy by Nanocarbon Black Powder

Mohammed S. Hamza; Amer Hameed Majeed; Hayder Raheem Kareem

Engineering and Technology Journal, 2013, Volume 31, Issue 12, Pages 2311-2319

This paper covers the effect of nanocarbon black powder (N220) on the some
physical properties (thermal conductivity and water absorption) of unsaturated and
epoxy resins filled with nanocarbon black powder (N220). The polymer
nanocomposites, were prepared with (1 to 10 wt%) of carbon black nanoparticles
using ultrasonic wave bath machine dispersion method. The results had shown
thermal conductivity of unsaturated and epoxy resins improved by (131.37% and
78%) respectively, at 10wt. %. The water absorption reduction by (55.41% at 4 wt.%,
51.76% at 6 wt.%) for unsaturated polyester and epoxy nanocomposite, respectively.

A Study of Some Mechanical, Thermal and Physical Properties of Polymer Blend with Iraqi Kaolin Filler

Najat J. Saleh; Samir Nassaf Mustafa

Engineering and Technology Journal, 2011, Volume 29, Issue 11, Pages 2114-2131

In the present work, polymer blends were fabricated by mixing two polymers
of polypropylene and poly (methyl methacrylate) mixed in different weight
percentage and different particle size of Iraqi kaolin. The study of some
mechanical, physical and thermal conductivity properties was carried out on all
composites. The mechanical tests included (impact, hardness, modulus of
elasticity, yield strength, elongation, stress at break and compression), Lee's disc
method was used to calculate the coefficient of the thermal conductivity of
specimens before and after reinforcement with kaolin powder. The physical
properties test included absorption tests, as well as X-ray measurement. The
results have shown that after the reinforcement with different weight percent of
kaolin powder, most mechanical properties such as hardness , modulus of
elasticity and compression increase while impact and elongation decrease with
increasing in weight percentage and a decreasing in particle size. The results have
shown also that the coefficient of thermal conductivity decreases with increase
weight percentage the water gain is decreased with the increase in weight percent
and decrease in particle size of the filler. X-ray diffraction pattern of filled
samples indicates that addition of kaolin adversely affects the crystallization of
PP/PMMA blend.