Ayed Ahmad Mahmoud Zuhud  <br/><br/>
Effect of polymers and seawater on the performance of recycled aggregate concrete /  
 تأثير البوليمرات ومياه البحر على اداء الخرسانة المصنعة من الركام المدور 
Ayed Ahmad Mahmoud Zuhud ; Supervised Ahmed Mahmoud Maher Ragab , Mohamed Mohsen Elattar , Mohamed M.S. Ziara    
 - Cairo :   Ayed Ahmad Mahmoud Zuhud ,   2017 
 - 154 P. :   charts , facsimiles ;   30cm 
<br/><br/>Thesis (Ph.D.) - Cairo University - Faculty of Engineering - Department of Civil Engineering  
<br/><br/> Gaza Strip doesn't have any source of natural aggregate(NA) to reconstruct the demolished  constructions .The mega quantities of highly contaminated construction and demolished  wastes with heavy metals have to be reused as recycled aggregate(RA) for structural concrete  .Using contaminated RA in concrete mixes will minimize leaching of hazardous materials to  surrounded environment. RA is highly water absorbable compared with natural aggregate. The  concrete made with RA has low mechanical properties especially tensile strength. To study the  effect of RA percentage, Polypropylene fiber (PP) , Siloxane polymer(SP) and seawater in  concrete mixes, eight types of concrete mixes were prepared. The results showed large  enhancement by 85.0% decrease of water absorption and high concrete resistance to seawater  effects by 15% increase in mechanical properties when SP was used. As a reason of using PP  fibers, the mechanical properties of RA concrete enhanced so much especially tensile strength  by 35.0%  
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<br/><br/><label>Subjects--Index Terms: </label>Construction and demolition wastes  Natural aggregates  Polypropylene fiber  Recycled aggregate