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Correlation of reinforcement efficiency factors with fibre concentration in short glass-fibre reinforced PBT/ ABS/SMA composities

Sun, 01 Dec 1996 00:00:00 GMT

Title: Correlation of reinforcement efficiency factors with fibre concentration in short glass-fibre reinforced PBT/ ABS/SMA composities Authors: Basu, Diya; Banerjee, A N Abstract: A blend of polybutylene-terephthalate (PBT) and acrylonirile-butadiene-styrene (ABS) terpolymer, with styrene-maleic-anhydride (SMA) as compatibilizer was reinforced with short glass-fibers. The PBT: ABS ratio was 70:30 by weight and the weight percentage of SMA was fixed at 5. Fiber concentration was varied from 10 to 50% by weight. The effects of variation of fiber volume fraction (V_f) on reinforcement efficiency factor for stiffness (β_E) and for strength (β_o) were studied. Both β_E and β_ovalues decreased with increasing V_f. Page(s): 262-263

Concentration distribution along unsteady groundwater flow

Sun, 01 Dec 1996 00:00:00 GMT

Title: Concentration distribution along unsteady groundwater flow Authors: Kumar, Naveen; Kumar, Mritunjay Abstract: Analytical solutions have been obtained to show the concentration distribution behaviour of pollutants from a point source along sinusoidally and exponentially varying groundwater flow in an aquifer of uniform permeability. A direct relationship between dispersion coefficient and velocity is used and new time variable is introduced to convert the partial differential equation with time dependent coefficients into one with constant coefficients. Page(s): 258-261

Influence of red mud particle incorporation on viscoelasticity of PS/LDPE blend

Sun, 01 Dec 1996 00:00:00 GMT

Title: Influence of red mud particle incorporation on viscoelasticity of PS/LDPE blend Authors: Chand, N; Hashmi, S A R; Vashishtha, S R Abstract: Semi crystalline low density polyethylene (IDPE) was blended with polystyrene (PS) by using melt blending procedure. Different weight-fraction of red mud (RM) particles was incorporated in the blend. Mechanical and rheological properties of filled and unfilled blends were evaluated. Modulus of blend increased with the addition of RM particles. Addition of RM particles increased the shear stress and melt viscosity of RM filled blend. Recoverable shear strain (S_R) was reduced on loading of RM particles in the blend, and increased with the increase in shear rate. Shear rigidity (G) increased with the increase in loading of RM particles Dependency of G on shear rate was also studies. Page(s): 253-257

Influence of silica fume on the properties of Portland slag cement

Sun, 01 Dec 1996 00:00:00 GMT

Title: Influence of silica fume on the properties of Portland slag cement Authors: EI-Didamony, H; Ali, A H; Mostafa, K A Abstract: The effect of silica fume on the hydration characteristics of Portland slag cement has been studied as a function of curing time up to 3 months. The results indicate that the free lime content decreases with the increase in silica fume and curing time. The DTA results are in good agreement with the results of the chemical analysis. Moreover, the combined water content increases with the increase in the amount of silica fume while decreases with the increase of slag content. Page(s): 248-252