Title:
Shear Stiffness and Strength of Horizontal
Construction Joints
Author(s):
Basel Djazmati and Jose A. Pincheira
Publication:
Structural Journal
Volume:
101
Issue:
4
Appears on pages(s):
484-493
Keywords:
concrete; construction joint; foundation; stiffness; strength
DOI:
10.14359/13334
Date:
7/1/2004
Abstract:
This paper presents the test results of unreinforced concrete construction joints subjected to in-plane shear forces. The main purpose of the study was to determine whether concrete foundations cast in multiple pours with horizontal construction joints could offer the same initial (uncracked) stiffness of those cast monolithically. The experimental program included 36 push-off shear units as well as six slab specimens. The study included several methods to bond fresh to hardened concrete and considered both technical and practical aspects related to the preparation, casting, and curing procedures of the joints. Based on the test results, it is concluded that members with a properly prepared and moist-cured joint offer the same initial stiffness as that of a member cast monolithically. Recommendations concerning the preparation, curing, and casting procedures to achieve a proper performance of the joint are provided.