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Volume 5, Issue 5 (September–October  2016)


Utilization of Bio materials as Pozzolanic material for partial replacement of Cement

Original Research

Journal of Chemistry and Materials Research Vol. 5 (5), 2016, 85–91

Akhtar Shahnaz, Phool Shahzadi *, Adnan Mujahid, Muhammad Saadet Khan, Ammarah Abbass, Ammarah Kanwal

 

Abstract

Portland cement is considered as back bone of construction and its demand is gaining momentum day by day with the rapid progress of construction industry. But as cement manufacturing process involve huge emission of carbon dioxide (CO2) into the environment which is the main cause of global warming. There is need to utilize waste material which shows cementing properties and can partially replace cement in construction industry. In present study, locally available bagasse ash obtained from waste dump sites of Noon Sugar mill Bhalwal was used in development of mortars partially replacing the cement. In this research work the ash was used as pozzolanic material in development of mortar cubes by replacing 10, 15, 20 and 25% by weight of ordinary Portland cement with bagasse ash. The mortars prepared were tested for compressive strength at curing period of 3, 7, 28 and 56 days.

 

Keywords: Pozzolanic Material, Bagasse ash, Cement.

Received

Received in revised
  Accepted
02 August 2016
24 September 2016
24 September 2016
 

Using of Lemna Minor for adsorption of Acid Green 3 dye (AG3) from aqueous solution: Isotherm and kinetic study

Original Research

Journal of Chemistry and Materials Research Vol. 5 (5), 2016, 92–98

Davoud Balarak *, Yousef Mahdavi , Ferdos Kord Mostafapour , Hossein Azarpira

 

Abstract

The dye-polluted effluents from the textile industries are considered as sever environmental issues due to their adverse effects on public health. The aim of this study was to evaluate the AG3 dye adsorption efficiency by dried Lemna minor (LM). The LM biomass was collected, dried and sieved into the 1-2 mm particle size. The prepared biomass was treated by 0.1 M HCl for 5 h and was washed with distilled water. The results indicated that there is direct relation between increasing of contact time and adsorbent dose with the AG3 adsorption efficiency. Also, the increasing of pH and initial AG3 dye concentration decreases the removal efficiency. The maximum dye adsorption was obtained in pH=3. The equilibrium data was best fitted on the Freundlich isotherm model. The kinetic study suggested that the Pseudo-second-order model can effectively describe the AG3 uptake by LM biomass. It can be concluded that the dried LM biomass can be used as effective adsorbent to remove the dyes from effluents.

 

Keywords: Adsorption; Lemna Minor; Isotherm; Kinetic; Acid Green 3.

Received
  Received in revised
Accepted
08 September 2016
-
26 September 2016
 

Temperature Dependence of High-Order Expanded Debye‒Waller Factors and XAFS of Metallic Molybdenium

Original Research

Journal of Chemistry and Materials Research Vol. 5 (5), 2016, 99–104

Nguyen Van Hung *, Trinh Thi Hue , Nguyen Ba Duc , Dinh Quoc Vuong

 

Abstract

Temperature dependence of high-order expanded Debye-Waller factors and X-ray absorption fine structure (XAFS) of Mo, a bcc crystal, has been studied based on the anharmonic correlated Debye model. The many-body effects are taken into account in the present one-dimensional model based on the anharmonic effective potential that includes interactions of absorber and backscatterer atoms with their first shell near neighbors, where Morse potential is assumed to describe the single-pair atomic interaction. Analytical expressions for the dispersion relation, correlated Debye frequency and temperature and four first temperature-dependent XAFS cumulants of bcc crystals have been derived using the many-body perturbation approach. The obtained cumulants have been applied to calculating XAFS spectra and their Fourier transform magnitudes. Numerical results for Mo are found to be in good agreement with experiment.

 

Keywords: Debye-Waller factor; Effective potential; Correlated Debye model; XAFS; Bcc crystals; Molybdenium.

Received
 Received in revised
 Accepted
25 September 2016
05 October 2016
 10 October 2016
 

Numerical Modelling of Mechanical Behavior of Multi-layer Sandwich Beams with Honeycomb Core Subjected to Biaxial Bending Impact

Original Research

Journal of Chemistry and Materials Research Vol. 5 (5), 2016, 105–109

Elhadj Ghelloudj *, Sifeddine Hafsaoui , Samir Brek , Hamid Djebaili , Mohamed Tahar Hannachi 

 

Abstract

Sandwich structures have the best stiffness over lightness ratio. It’s what makes them very useful in industrial applications, for instance aerospace, transport and maritime fields. The aim of this study is to investigate and analysis, behavior of composite sandwich Beams with Honeycomb Core made from woven polyester resin/glass fibers (T800/M300) and aluminum honeycomb core that can be used for safety important structures. In this work we propose a numerical study using a calculation software, structural analysis by finite element method (Cast3m), for determining the stresses and displacements in the sandwich beams under biaxial bending  impact.

 

Keywords: Sandwich structures; Numerical modeling; Honeycomb; Biaxial bending.

Received
 Received in revised
 Accepted
26 September 2016
13 October 2016
13 October 2016