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Chore, Hemant Sharad,Joshi, Mrunal Prashant Techno-Press 2021 Advances in concrete construction Vol.12 No.5
The overuse level of cement for civil industry has several undesirable social and ecological consequences. Substitution of cement with industrial wastes, called by-products, such as fly ash, ground granulated blast furnace slag, silica fume, metakaoline, rice husk ash, etc. as the mineral admixtures offers various advantages such as technical, economical and environmental which are very important in the era of sustainability in construction industry. The paper presents the experimental investigations for assessing the mechanical properties of the concrete made using the Pozzolanic waste materials (supplementary cementitious materials) such as fly ash and silica fume as the cement replacing materials. These materials were used in eight trial mixes with varying amount of ordinary Portland cement. These SCMs were kept in equal proportions in all the eight trial mixes. The chemical admixture (High Range Water Reducing Admixture) was also added to improve the workability of concrete. The compressive strengths for 7, 28, 40 and 90 days curing were evaluated whereas the flexural and tensile strengths corresponding to 7, 28 and 40 days curing were evaluated. The study corroborates that the Pozzolanic materials used in the present investigation as partial replacement for cement can render the sustainable concrete which can be used in the rigid pavement construction.
Development of vildagliptin loaded Eudragit® microspheres by screening design: in vitro evaluation
Jitendra B. Naik,Mrunal R. Waghulde 한국약제학회 2018 Journal of Pharmaceutical Investigation Vol.48 No.6
The aim of this study was to develop and characterize sustained release vildagliptin (VLG) loaded Eudragit ® RS-100 microspheres. The microspheres were prepared by single emulsion [oil-in-oil (O/O)] solvent evaporation method. Plackett–Burman design (PBD) was employed by using Design-Expert® Software to screen and understand impact of five independent formulation factors such as Eudragit ® RS-100 (A), span-80 (B), acetone (C), methanol (D), stirring speed (E) affecting on encapsulation efficiency (EE) and dissolution rate (DR). The developed microspheres were evaluated by Field emission scanning electron microscopy (FE-SEM); particle size analyzer (PSA); Fourier transform infrared spectroscopy (FTIR); X-ray powder diffraction (XRD) and in-vitro drug release as well as microspheres were assessed for accelerated stability. The microspheres obtained were spherical in shape with non-porous surface and the mean particle size was 1.077 μm. FTIR and XRD study confirmed drug-polymer compatibility. EE obtained from all microspheres formulations was found in the range of 61.83–84.77%. 2D contour and 3D surface plots showed potential effects of independent factors on EE and DR. Sustained drug release profile (up to 12 h) was attained by Eudragit ® RS100 polymer. Accelerated stability results for attributes like physical appearance and drug content did not showed any significant change over the period. Eudragit ® RS-100 polymer could be used as favourable sustained release carrier in developing VLG loaded microspheres for the treatment of hyperglycemia to increase its duration of action.