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Register a new userExperimental Study to determine Elastic Modulus of Natural-Pozzolan- Modified Concrete
دراسة تجريبية لتحديد معامل المرونة للبيتون المعدل بالبوزولان الطبيعي
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يتناول البحث إيجاد علاقة تجريبية تربط بين معامل المرونة و المقاومة على الضغط للبيتون المنفذ من مواد أولية محمية و المعدل بواسطة البوزولان الطبيعي المضاف إلى البيتون بنسب ( 0-10-15-20)% من وزن و لعياري اسمنت (350و400) كغ\م3 و لأعمار كسر (28-90) يوم ، ثم مقارنة ىذه العلاقة مع علاقات موجودة في كودات أجنبية و لبلدان مختلفة و اختيار النسبة الأمثل للبوزولانا. بالنتيجة تم اقتراح علاقة تجريبية جديدة تربط بين معامل المرونة و المقاومة على الضغط في البيتون الحاوي على البوزولان الطبيعي .
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 cement 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.
References used
The Syrian Arabic code (2012). Design of concrete structures
ACI 318 R – 14, building code requirements for structural concrete and commentary, American Concrete Institute, 315 p. 2014
Euro code 2 (2001). Design of concrete structures-Part1: General rules and rules for buildings, European Committee Standardization, Brussels
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he property of it's three components individual.
The validation of the proposed model has been studied extensively depending on a sample of cement mortar divided into two groups, the first one patterning normal cement mortar, second patterning modified cement mortar by Polyethylene witch substitute five percentage ratio of weight of sand by the same ratio of Polyethylene.
Modified cement mortar is treated as composite of three components, Sand, Paste cement and Polyethylene. It's will be proposed models involving series, parallel and series-parallel coupling. This composite action is described by series-parallel model in which a portion of paste acts in parallel with sand and polyethylene and the remaining portion in series with this parallel coupling. Then according to the model we get Young's elastic modulus theoretically, reliance basic modulus factors of components.
The proposed model is calibrated and verified by means of data set by experiment modulus results perform on cast samples in laboratory.
It was found quite agreement of measured modulus factors experimentally versus theoretically.
This study aims mainly to determine the temperature distribution
heat transfer enhancement under natural convection experimental,
from three surfaces with industrial roughness created by a special
machine (roughness surfaces) with triangular, trapezoidal, spherical
configuration compared to equivalent smooth surface.
With cross-sectional area.
سطح مخشن
سطح أملس
معامل انتقال الحرارة
Rough surfaces
Smooth surfaces
Enhanced heat transfer
Heat transfer coefficient
Convection heat transfer
Temperature distribution
التوزيع الحراري
التبدد الحراري
التحسن في انتقال الحرارة
انتقال الحرارة بالحمل الطبيعي
تحسين انتقال الحراراة
بروزات
مقاطع
heat dissipation
ribs
configurations
المزيد..
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 (Eoed) were determined from
oedometric compression curves at various compression levels, and
particle shape parameters (sphericity-roundness-elongation) were
founded for each soil then the experimental equations between
last parameters and deformation modulus were concluded.
Laboratory program was conducted on different clayey soils to
determine linear modulus of elasticity, and to compare the results
with those concluded from field plate load testing.
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.
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