3656

3455

كارشناسي ارشد

سازه

اصفهان :دانشگاه صنعتي اصفهان ،دانشكده عمران

1386

يازده ،145،[II]ص. :مصور ،نمودار ،جدول

ص.ع.به فارسي و انگليسي

داوود مستوفي نژاد

محمد مهدي سعادتپور

13/5/86

محمد شكرچي زاده ، مرتضي مدح خوان

مهندسي عمران

ID3455

به فارسي و انگليسي : قابل رويت به صورت نسخه ديجيتال

Abstract Brittleness is one of the problems that limits usage of concrete in some cases Whenordinary concrete reaches to peak load and cracks it disintegrates and does not sustainload anymore Researchers have added different materials to the concrete to overcomethis problem Adding fibers is one of the ways to increase its energy absorptioncapability Because of high ductility and deformability of rubber and polystyrene thesematerials have been used to increase ductility of concrete Different amounts of fine aggregates in ordinary concrete were replaced with twosizes of rubber powders and two sizes of polystyrene Also different amounts of coarseaggregates were replaced with shredded rubber in three sizes to investigate the effect ofquantity and size of these aggregates on the energy absorption capability of concrete Inaddition to assessing ductility workability unit weight compressive strength andflexural strength were evaluated For this purpose 336 cubic specimens and 168 prismspecimens were molded and tested Flexural toughness tests were done to study energyabsorption capability according to ASTM and Japan standards Experimental results showed that when the concrete containing rubber andpolystyrene reaches to the peak load and cracking happens it sustains lower loads anddoes not fully disintegrate Also the results showed that in the concrete containingshredded rubbers toughness factor I50 was increased up to 35 and residual strength factorincreased up to 70

داوود مستوفي نژاد

محمد مهدي سعادتپور

محمد شكرچي زاده ، مرتضي مدح خوان