Analysis of Initial Concrete Testing in Relation to Expected Performance
WASHINGTON UNIV SEATTLE
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Portland cement concrete is unique among most construction materials in that its properties change substantially from when delivered to the job site to when the final produce made from the concrete is put to use. When delivered, the concrete must exhibit uniformity and workability sufficient to place and consolidate the fresh concrete. After sufficient curing the concrete must have strength and durability. Quality control testing must therefore consider both fresh and hardened properties to evaluate the acceptability of the concrete for its intended application. Standard quality control testing performed at the job site includes slump, air content, unit weight and yield. The information derived from the tests is believed to provide inspectors with an initial indication of the expected short and long term performance of the concrete. The purpose of this research was to investigate the policies and procedures of various agencies for quality control testing at the job site and to determine the influence of one of many important parameters affecting portland concrete, final aggregate gradation, on the test results. Results of this investigation were used to make an assessment of the adequacy of current job site procedures and to develop recommendations for improvement and identify areas requiring further research effort.
- Ceramics, Refractories and Glass
- Construction Equipment, Materials and Supplies