| Title |
Evaluation of Shear Friction Performance at Construction Joints of Lightweight Concrete using Bottom Ash Aggregates and Air Foams |
| Authors |
김종원(Kim, Jong-Won) ; 양근혁(Yang, Keun-Hyeok) ; 문주현(Mun, Ju-Hyun) |
| DOI |
https://doi.org/10.5659/JAIK.2020.36.9.139 |
| Keywords |
Bottom Ash Aggregate; Air Foam; Construction Joint; Shear Friction Strength; Lightweight Concrete |
| Abstract |
This study aimed to examine the shear friction strength at the smooth construction joints of lightweight concrete made using bottom ash
aggregates and air foams (LWC-BF). Nine push-off specimens were prepared with the variation of foam volume and tested under direct shear
and additional compressive forces applied normally to the shear plane. The increase in foam volume fraction reduced the shear friction
resistance at the smooth construction joints, resulting from the decrease in the compressive strength. Meanwhile, the additional compressive
forces improved the shear friction strength-relative slip relationship of LWC-BF, revealing the higher shear friction strength and greater
amount of relative slip with the increase in the additional compressive stresses. The shear friction strength of LWC-BF could be reasonably
assessed by the equation proposed by Yang on the basis of the upper-bound theorem of concrete plasticity. |