Title:
Concreting Workmanship and its Influence on Serviceability Reliability
Author(s):
Mark G. Stewart
Publication:
Materials Journal
Volume:
94
Issue:
6
Appears on pages(s):
501-509
Keywords:
beams (supports); compaction tests; compressive strength;
concretes; curing; reinforced concrete; serviceability; tensile strength;
DOI:
10.14359/334
Date:
11/1/1997
Abstract:
A serviceability reliability model is used herein to calculate probabilities of serviceability failure for reinforced concrete beams. Results are reported herein of a survey investigating the percentage of construction sites that exhibit poor, fair, or good levels of workmanship for concreting tasks that influence concrete compressive strength; namely, compaction and curing. Using this information, probabilistic models have been developed to describe the influence that these tasks have on concrete compressive and tensile strengths. These material property models are included in the serviceability reliability model. It was found that poor concreting workmanship reduced serviceability reliability by more than an order of magnitude, and that inadequate curing is more detrimental to serviceability performance than inadequate compaction. The incorporation of element dimension and reinforcement placement errors into the analysis had little influence on serviceability reliabilities.*