ABSTRACT
Abstract This paper describe s th e experimental stud y o f th e feasibility o f reusing th e aggregate reclaime d fro m concret e masse s which resulte d from th e demolition o f concrete structures . Thre e type s o f recycle d coarse aggregat e whic h wer e produced i n deferent processe s wer e used . The characteristic feature s o f failures unde r th e influenc e o f shea r and flexur e ar e distinguished. Th e behavio r o f th e beams i s described i n terms o f deflection, failur e modes, reinforcemen t strains , and crac k patterns . Du e t o static loading , th e experiment clarifie d the followin g points : Th e use of recycled aggregat e concret e fo r structural member s dominantl y subjec t t o bending moment s resulte d i n the development o f cracks wit h marginall y large r openings. However , the use o f recycled aggregat e ha d littl e affect . I n contrast, struc - tural member s dominantl y subjec t t o shear force s developed crack s along th e longitudina l reinforcemen t whic h wer e indicativ e o f a deteriorated bond . Thi s showed a certain degre e of difference, i n the mode o f failure , fro m structura l member s compose d o f natura l aggregate. A s well, th e rigidity o f th e beams undergoin g a fatigu e loading tes t obviousl y decrease d dependin g o n th e low-grad e recycle d aggregate wa s used . Thi s tendenc y wa s more noticeable whe n beam s were given a shear loadin g test . Bon d tests , using th e Schmidt-Thr o test method , clarifie d th e interrelate d bon d propertie s involvin g th e type of recycle d coars e aggregate, th e direction o f placing concrete , the thicknes s o f cover, an d th e strength o f th e concrete. Keywords: Recycling , Concrete , Recycle d coars e aggregate , Flexur e and Shear , Fatigue , Crack , Concret e cover , Bon d stress.
