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Register a new userدراسة تأثير إدخال الألياف النسيجية على معامل التوصيل الحراري للبيتون
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تتلخص فكرة هذا البحث حول دراسة تغير معامل التوصيل الحراري لمزيج من البيتون مع الياف الصوف السورية بنسب وزنية مقدارها 0.5%, 1%, 2%, 4% بهدف تخفيض معدل الضياعات الحرارية للأبنية.
The idea of this research is about the study of the change of thermal conductivity of blend mixture composed of Syrian woolen fibers with concrete of equal weight percentages of 0,5%, 1%, 2% and 4% respectively. the purpose is to diminish the ratio of the thermal loss in the building.
References used
Luikov., A. V., Shashkov, A.G., Vasliev, L.L., and Fraiman, Y.E., " Thermal conductivity of porous systems: Int. J. heat and mass transfer, vol 11,1968
Battacharyya, R.K., "Heat transfer model for fibrous insulation ", Thermal insulation performance, ASTM STP 718, McElroy, D.L., and Tye, R.P., Eds., ASTM 1980
Arunkumar, C., Megwal, H.S., Borkar S.P., Bhongade, A.L., 'Recycling of Chicken Feather and Wool Fiber Waste into Reinforced Multilayer Composite – A Review', Technical Textile, Journal of the Textile Association, March-April 2013
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This research presents an empirical relationship between modulus
of elasticity with compressive strength concrete that is prepeard
from localized materials and containing several perecentages of
natural pozzolan (0 ,10 ,15, 20)% , also for tow cem
ent quantity
(350 ,400 ) Kg/m3 and for tow ages(28 ,90 ) day .Then comparing
the experimentally obtained result with the mechanical properties
calculated using the recommend relationship from the various
design codes. A new empirical relationship between elastic
modulus, and compressive strength for concrete containing natural
pozzolan is proposed.
This search include making laboratory tests on sandy soil samples
,wich were taken from Damascus Suburb (Alkastal-Maarona-
Alsallema) and from Hama(Alsalameya), physical and clasificated
tests were made besides oedometer tests, two limited cases w
ere
studied :maximum loose and maximum dense for each soil.
Values of deformation modulus (E) were determined from
oedometric compression curves at various compression levels, and
then the experimental equations between deformation modulus
and primary void ratio, and between modulus of lateral soil
pressure and deformation modulus were concluded at maximum
loose and maximum dense.
This research presents an experimental study about the effect of steel fibers on the
main variables of stress- strain curve for high strength concrete on simple compression,
which are: shape of stress- strain curve, ductility factor, energy absorpt
ion capacity. For
this purpose, series of cylinders concrete specimens were prepared in compressive strength
(70 MPa). the steel fiber with aspect ratio of L/D =70 were added at the volume fractions
of (0-1-1.5-2)%. The cylinders were tested under a monotonic loading at compression, and
as a result of the tests, the total curve of stress- strain was obtained. The experimental
results of research showed a positive effect of steel fibers on the behavior of high strength
concrete, this effect increased with increasing volume fraction of steel fibers. It can be seen
from stress-strain curve, whereas the slope of the ascending branch is not much affected.
The descending branch of the stress- strain curve decreases by the increase in the fiber
volume fraction. This means the ductility and toughness improve with the addition of steel
fibers and as a result the behavior of high strength concrete has gone far away from being
brittle as it is used to be.
In this research, we did the optical spectral study for using
ultrasound energy in dyeing wool fibers using acid dyes. That we
dyed wool fibers using both traditional dyeing and ultrasound
techniques by using three acid dyes from different firms.
The results of exhaustion percentage of the dye had been compared "the total moving dyes from a solution to fibers after dyeing".
The exhaustion rate of some dyes increased by a large proportion
but the effect on the fastness of the light, rubbing and washing was not great.
Tow samples of Al2O3/CdO mixed oxide were prepared by co-precipitation method at
PH 8 using concentrated ammonia as precipitated agent.The mixed system was prepared by
mixing aluminum chloride solution with cadmium chloride solution and aluminum ni
trate
solution with cadmium nitrate solution which prepared in previous work.
The nature of anions affected pore radii anions.
The results showed the increasing of micro porosity.
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