November 2006
A new pozzolanic material for cement industry: Bamboo leaf ash
Bamboo leaf fired in an open atmosphere and then heated at 600oC for 2h in a furnace was found to be an amorphous material containing amorphous silica. The ash was characterized by chemical analysis, powder X-ray diffraction and SEM techniques. Reactions of the ash with calcium hydroxide showed it to be pozzolanic in nature. The pozzolanic reactivity increased with time and temperature. When 20 wt% bamboo leaf ash was...
November 2006
The early heat of hydration of blended cements incorporating GGBFS and ground basaltic pumice (GBP)
In this study, the effect of blended cements containing additives on the heat of hydration and the rate of heat liberation was investigated. The blended cements were prepared by using clinker, ground granulated blast-furnace slag (GGBFS) and ground basaltic pumice (GBP). Two groups of specimens were prepared by the grinding method of intergrinding and separate grinding. For each group of specimen, two Blaine values of...
November 2006
Efficiency of densification process in preparation of carbon-carbon composites
Material balance of densification process was made to assess its efficiency in dependence on impregnation conditions. Theoretical values of apparent porosity, bulk density and apparent specific gravity were computed and compared with experimental ones. Densification efficiency was determined as the ratio of volume of added matrix to volume of pores. Key Words: Composites, Polymers, Structural...
November 2006
Theoretical and experimental studies in hydrogen bonded glass forming systems
The aim of this work is to clarify some features of glass forming systems, such as temperature dependence of density, thermal expansion coefficient and shear viscosity. They are first discussed from the theoretical point of view and then experimentally tested for glycerol. The parameters y, interpreted as the effective number of degrees of freedom related to the a-relaxation process, and j, the...
November 2006
Dielectric, optical and thermodynamical properties of liquid crystal sample exhibiting SmA phase
The dielectric constant and dielectric loss with dielectric anisotropy have been measured as a function of temperature in the frequency range of 1 kHz to 10 MHz for a newly synthesized liquid crystal sample-exhibiting SmA phase. The measurement in SmA phase indicates dielectric relaxation at frequency 4.778 kHz for 80 0C. The Enthalpy of activation was found to be 14.57 Kcal/mole. The results have been explained on...
November 2006
Modeling relative influence of environmental and socio-cultural factors on context-specific functions
Traditional models in building physics are based on theories in physics and physiology, typically characterized by a-contextual settings and domain-specific articulations. It is, however, commonly understood and appreciated that physics and physiology, alone, do not entirely explain observed patterns of user behavior in buildings-in-use, and that people do not experience various aspects of a setting in isolation. This...
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