Home >> Volume >>
Daftar Isi >> Detail
Untitled Document
VOLUME XIV Edisi 1 , April 2009
PENGARUH FAS PADA BETON TERHADAP TEGANGAN LEKAT BAJA TULANGAN POLOS (BJTP) DENGAN PENGANGKERAN LURUS DAN KAIT STANDAR |
Jurusan Teknik Spil Fakultas Teknik UKRIM Yogyakarta |
The strength and integrity of reinforced concrete element depend largely on the effectiveness of the bond between the concrete and reinforcing rod at the anchoring ends. Past investigations have revealed that one of the causes of the reduction in the anchoring capacity of steel bars with end hooks is the presence of cavities in the part of the concrete where the end hooks rest. This research is aimed to study the effect of water cement ratio on the effectiveness of the bonding strength between concrete and steel rod at its anchoring point. Concrete cylinder specimens were cast with water cement ratios of 0.4, 0.55, 0.60, 0.70, and 0.75. In each test specimens ordinary reinforcing steel bar of diameter 7.5 mm were planted with either straight of standard hook anchoring. The steel bars were pulled out after the specimen was 28 days old. The amount of load needed to pull the rod as much as 0.25 mm was recorded. The test revealed that maximum bonding resistance between the concrete and rod was an achieved at a water cement ratio 0.65 for both straight as well as hook anchoring. Below a water cement ratio to 0.65 and increase in the water cement ratio resulted in a steady increase of bonding strength. Beyond 0.65 a steady decrease in the bonding strength was noted with increasing water cement ratio. It was also observed that increasing water cement ratio resulted in the narrowing of the gap in the steel-concrete bonding strength for specimens with straight and hook anchoring. Another observation was the significant increase in the effectiveness of the standard hook anchoring a increasing water cement ratio, even tough the compressive strength of the specimens were more less the same. |
bonding strength, water cement ratio |
 Download Artikel |
JOURNAL CONTENT
LINKS FREE JOURNALS
LINKS FREE JOURNALS