COBEM99

S3 Ciências dos Materiais

Title:

BEHAVIOR AND STRENGTH OF REINFORCED CONCRETE BEAMS WITH THE ADDITION OF SHORT STEEL FIBERS

Summary :

THE RESULTS OF AN EXPERIMENTAL INVESTIGATION OF THE EFFECTS OF SHORT FIBERS ON THE BEHAVIOR AND STRENGTH OF SIMPLY SUPPORTED REINFORCED CONCRETE BEAMS ARE PRESENTED. TWO TYPES OF STEEL FIBER WITH DIFFERENT SHAPES, LENGTHS AND CROSS SECTIONS WERE USED. THE UNIAXIAL COMPRESSIVE STRENGTH, THE SECANT STATIC ELASTIC MODULUS AND THE MODULUS OF RUPTURE OF THE CONCRETE EMPLOYED IN THE BEAMS WERE ALSO INVESTIGATED. SIX SERIES OF REINFORCED CONCRETE BEAMS WERE CAST AND TESTED IN THE LABORATORY. EACH SERIES HAD A DIFFERENT RATIO OF TRANSVERSE REINFORCEMENT AS WELL AS THE ADDITION OR NOT OF STEEL FIBERS IN THE CONCRETE MIX. ANALYSIS OF THE MECHANICAL PROPERTIES OF THE CONCRETE SHOWS THAT THE ADDITION OF FIBERS GENERATES NOT ONLY SMALLER VALUES OF COMPRESSIVE STRENGTH AND SECANT MODULUS OF ELASTICITY BUT ALSO SMALLER RATES OF INCREASE IN THESE PROPERTIES AT AGES BELOW 28 DAYS. FOR THE MODULUS OF RUPTURE, THE INVERSE WAS OBSERVED. THE BEAM TEST RESULTS INDICATE EXPRESSIVELY THE BETTER PERFORMANCE OF THE BEAMS MADE WITH FIBERS. THESE BEAMS EXHIBITED SMALLER CRACK WIDTH AND SPACING AND CONSEQUENTLY MORE STIFFNESS AND LOAD CARRYING CAPACITY. THE RESULTS ALSO INDICATE AN INCREASE IN THE LOAD CAPACITY OF THE SHEAR MECHANISMS OF THE CONCRETE. KEYWORDS: REINFORCED CONCRETE BEAMS, SHORT STEEL FIBERS, STRENGTH, BEHAVIOR

Author :

Calixto, José Marcio Fonseca
Filho, Landry Salles Vidal
Gonçalvez, Carla Montanari

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