Title: Workmanship and its Influence on Probabilistic Models of Concrete compressive strength

Author(s): Mark G. Stewart

Publication: Materials Journal

Volume: 92

Issue: 4

Appears on pages(s): 361-372

Keywords: compaction; compressive strength; concretes; controls; curing; probability; structural reliability; workmanship; Structural Research

DOI: 10.14359/1000

Date: 7/1/1995

Abstract:
Results are reported of a survey investigating the percentage of construction sites that exhibit poor, fair, or good levels of performance for tasks that directly influence concrete compressive strength, namely, quality of supplied concrete mix, compaction, and curing. Using this information and existing empirical cylinder strength data, probabilistic models have been developed to describe the variability of concrete compressive strengths within and between buildings, if performance levels for quality of mix, compaction, and curing are known. These probabilistic models may be used to calculate more realistic estimates of structural reliability (strength and serviceability limit states), and to assess the influence of task performance on structural reliability.