Title: Bond of Reinforcement in Reactive Powder Concrete at Different Ages
Author(s): Ângela Costa Piccinini, Luiz Carlos Pinto da Silva Filho, and Américo Campos Filho
Publication: Materials Journal
Appears on pages(s): 169-176
Keywords: blast-furnace slag; bond steel-RPC; pullout test; reactive powder concrete (RPC)
This research evaluated the bond behavior of reinforcement and the mechanical characteristics in a reactive powder concrete (RPC) replacing 35% cement with blast-furnace slag. Pullout tests were performed at the ages of 3, 7, 28, 56, 63, and 91 days on cylindrical samples. The embedded length used was double the diameter of the bar. At 3 days it presented compressive strength of 41% of the maximum obtained, which was 123.06 MPa at 91 days. There was an increase in strength until the age of 56 days and after stabilization of the curves. In pullout tests, it was noticed the considerable influence of the rib, because in tests with plain bars, the bond force was below 20% of the results with ribbed bar, which reached 54.38 MPa of strength. The compression curve was similar to the bond curve. Underestimated values were observed when the researchers’ equations were applied to calculate the maximum bond strength.