Future University In Egypt (FUE)
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Altagamoa Al Khames, Main centre of town, end of 90th Street
New Cairo
Egypt
Faculty of Engineering & Technology
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youssefawad

Basic information

Name : youssefawad
Title: Assistant Lecturer
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Personal Info: Youssef Ahmed Elsayed, born on 04/08/1990. Bsc. Future university in egypt.Faculty of Engineering. Msc. Ainshams university.faculty of engineering.

Education

Certificate Major University Year
Masters Civil Engineering Ain shams university - Faculty of Engineering 2018
Bachelor Civil Engineering Future University - Faculty of Engineering 2012

Teaching Experience

Name of Organization Position From Date To Date
future university in egypt Assistant Lecturer 01/01/2018 01/01/2019
future university in egypt teaching assistance 01/01/2012 01/01/2018
national trade company civil engineer 01/01/2011 01/01/2012

Researches /Publications

EFFECT OF FIRE EXTINGUISHING METHOD AND SURFACE AREA TO VOLUME RATIO ON ULTIMATE STRENGTH OF RC COLUMNS SUBJECTED TO FIRE - 01/0

Youssef Ahmed Elsayed Kamaleldin Ahmed Awad

Mohamed Kohail, Mohamed A. Khalaf

01/07/2018

Concrete is more durable against fire than other construction materials. However, high temperature has deteriorating effects on concrete mechanical properties. Decrease of strength at higher tempera¬ture can be associated with various reasons, such as micro-and macro-cracks in concrete, volume expansion of coarse aggregates and the deterioration of calcium silicate hydrate (C-S-H) gel in the cement paste. Behavior of concrete subjected to fire depends on its mix properties, fire temperature and duration, dimensions of the structural elements, thickness of the concrete cover, fire extinguishing method (which control the rate of cooling) and the surface area to volume ratio of different structural elements. The main objective of this research is to study the effect of four different extinguishing methods on the ultimate strength of 30 reinforced concrete columns subjected to fire. The tested columns are of different surface area to volume ratios. Non-destructive tests (Core & Ultrasonic pulse velocity tests) were used to estimate the deterioration extent of concrete subjected to fire. Results of the experimental study had shown that by increasing the surface area to volume ratio or by increasing the cooling rate, the ultimate strength of RC columns decreased considerably. A mathematical model was developed to estimate the ultimate strength of RC columns subjected to fire in order to decide whether these columns deserved repair and strengthening or not. Results of the mathematical model and the obtained experimental results were compared together to evaluate the accuracy of the proposed model

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EFFECT OF FIRE TEMPERATURE & DURATION ON ULTIMATE STRENGTH OF R.C. COLUMNS WITH DIFFERENT CROSS SECTIONAL SHAPES - 01/0

Youssef Ahmed Elsayed Kamaleldin Ahmed Awad

Mohamed A. Khalaf, Yehia A. Ali

01/04/2018

Deterioration of reinforced concrete structures can be happened due to many reasons; fire is considered one of the most important deterioration reasons that can lead to a complete and a catastrophic failure. In order to evaluate the degradation level of a RC structures exposed to fire, a number of factors should be considered. These factors are: fire duration, fire peak temperature, dimensions of member, humidity and age of concrete, type of coarse aggre¬gate, chemical composition of cement, water-cement ratio, and the loading conditions of the structural member.(3,4). The main goal of this research is to study the effect of two fires with two different temperatures and durations on the ultimate strength of 18 reinforced concrete columns. The first 6 columns were subjected to a fire of 300oC for 3 hours, 6 columns were subjected to a fire of 600oC for 6 hours and the last 6 columns were used as control (reference) columns without fire exposure and used for comparison. The tested 18 columns are of different cross sectional shapes (circular, square and rectangular) to account for the effect of surface area to volume ratio. Core tests were used to estimate the concrete compressive strength and the depth of the fire affected layer. A mathematical model was proposed to estimate the failure load of RC columns subjected to fire to decide if the structure needs repair and strengthening or not. Results of the mathematical model and the measured experimental results were compared together.

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