Title:
Long-Term Deflection of Reinforced Self-Consolidating Concrete Beams
Author(s):
Claudio Mazzotti and Marco Savoia
Publication:
Structural Journal
Volume:
106
Issue:
6
Appears on pages(s):
772-781
Keywords:
creep; flexural strength; self-consolidating concrete; shrinkage; tests
DOI:
10.14359/51663178
Date:
11/1/2009
Abstract:
The long-term behavior of reinforced self-consolidating concrete (SCC) beams has been investigated. Tests on concrete cylindrical specimens made with a specific SCC mixture have been performed first, showing that shrinkage and creep deformations are greater than predicted by European Model Code 1990 provisions. Longterm tests on reinforced SCC beams have also been performed according to the four-point bending scheme. The maximum stress on concrete in compression was approximately 35% of strength at the time of loading (37 days). The time evolution of midspan deflection as well as the strains at the compressive and tensile sides have been recorded. The beam deflection has been compared with the predictions by existing analytical models. The creepstrength interaction has been also investigated by performing failure tests on control beams before and after long-term tests, and comparing them with tests on beams subjected to long-term loading. A small flexural strength increase with age at testing has been observed from the comparison of failure tests. It is related on a small compressive strength increase due to concrete aging, whereas the damage due to long-term loading previously applied was not significant.