Estudo laboratorial dos danos causados pelo broqueamento e retificaÃÃo em corpos-de-prova testemunhos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

It is normal in engineer practice to use core testing to determine the inplace compressive strength of concrete in a structure. Generally, cores are obtained to: Asses whether suspect concrete in a new structure complies with strength-based acceptance criteria; or determine in-place concrete strengths in an existing structure for the evaluation of structural capacity. Several factors affect the value of concrete strength obtained by core testing: length and diameter of core, length-to-diameter (l/d) ratio, moisture condition, coring direction, age, drilling, saw, etc. Several strength correction factors are presented by the codes. Strength correction factor for drilling effects is presented only by ACI 214.4R-03. Experimental results about core tests are presented in this work. The main objective is study drilling effect in the core. The coring direction and length-to-diameter are also considered. The cores were drilled from the 180 specimens, 300x300mm. The concrete strength was 29MPa. Cylinders tests were included in this research. The cylinders casting were 150x300 and 100x200 in size. The cores and cylinders were subjected to the same moisture conditions. The length-todiameter ratio were 1.0, 1.5 and 2.0. The cores were drilled at the age of 180 days. Statistical analysis techniques were used. The tests results of core with length-todiameter 2.0, confirm the strength correction factor established by ACI 214.4R-03.

ASSUNTO(S)

testemunho (corpos-de-provas) broqueamento core tests drilling effects engenharia civil engenharia civil - estruturas retificaÃÃo â estudo laboratorial strength correction factor

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