RT - Journal Article
T1 - BEHAVIOR OF LOW TO HIGH-STRENGTH LIGHTWEIGHT CONCRETE UNDER TORSION
JF - IJCE
YR - 2005
JO - IJCE
VO - 3
IS - 3
UR - http://ijce.iust.ac.ir/article-1-56-en.html
SP - 182
EP - 191
K1 - HIGH
K1 - STRENGTH CONCRETE
K1 - TORSION STRENGTH
K1 - LIGHTWEIGHT AGGREGATE CONCRETE
K1 - TEST
AB - Results of an experimental investigation performed to evaluate the effect of various concrete strength levels on behavior of lightweight concrete (LWC) under pure torsion are reported.The principle variable of the testing program was compressive strength of concrete (�'c) which ranged between 6.9 and 81.4 MPa. Ten mixture proportions were utilized for LWC of 1500 to 2050 kg/m3 unit weight. In total, sixty four (thirty two pairs) rectangular specimens with 100x 200 mm cross-section were tested. Ultimate torsion strength of LWC increases as uniaxial compressive strength increases however the increase rate reduces for high levels of concrete strengths. The test results are compared with predictions of elastic and plastic theories for torsion and the ACI Code. The Code underestimates the cracking torque of LWC under pure torsion. A regression equation incorporating test results is higher than the ACI equation prediction by a factor of 1.12.
LA eng
UL http://ijce.iust.ac.ir/article-1-56-en.html
M3
ER -