Experimental Study on Shear Behavior of New and Existing Concrete Interface with Chiseled and Embedded Reinforcement
The interface between the new and existing concrete is the key to the overall structural strength,especially the shear strength.Taking the rebar planting rate(0.17%,0.34%,0.51%)and the depth of post-installed rebar(10,15 cm)as variables,5 groups of 10 Z-shape specimens were fabricated for the shear test,and the influences of the above variables on the specimens'shear behavior were obtained.The results show that the failure surfaces of all specimens are accompanied by aggregate shearing and mortar-aggregate debonding phenomena,exhibiting typical brittle damage characteristics.After cracking of the post-installed rebar specimens,the shear capacity is mainly borne by the post-installed rebar.The crack resistance and shear strength of the specimens are increased by increasing the rebar planting rate and depth of post-installed rebar.The cracking and ultimate shear stresses of the monolithic specimens are 2.98,7.22 MPa respectively,which are the maximum values of all specimens,indicating that the monolithic specimens have the best cracking resistance and the highest shear strength.
bridge engineeringnew and existing concreteshear testpost-installed rebarjoint surface
NETL
NSTL
万方数据
