Transcription of Acceptance testing and criteria for ready mixed concrete ...
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Acceptance testing and criteria for ready mixed concrete ...
1 Acceptance testing and criteria for ready mixed concrete in Hong Kong Al bert Kwan and Isaac Ling Department of Civil Engineering The University of Hong Kong 2 Outline Introduction Producer s Risk and Consumer s Risk Review on Standards for Acceptance testing and criteria Effect of Target Mean Strength on Producer s Risk Effect of Workmanship on Cube Compressive Strength and Density Experimental Program Results and Discussions Concluding Remarks and Recommendations 3 concrete Complex materials made of Aggregates particles Cementitious materials Chemical admixtures Polymer latex or bituminous emulsions Various kinds of fibres Difficulties in controlling the quality of concrete produced Batch-to -batch variations Within-batch / Within-test variations 4 Measurement of variation Mean strength Standard deviation Coefficient of variation xc v=5 Producer s Risk and Consumer s Risk Producer s Risk Rejection of concrete that is up-to -standard Higher cost price Consumer s Risk Acceptance of concrete that is sub -standard Stringent Acceptance criteria 6 Review on Standards for Acceptance testing and criteria of concrete Foreign codes American Standard ACI 214R-11 European Standard BS EN 206: 2013 Local codes Code of Practice for Structural Use of concrete : 2013 General Specification for Civil Engineering Works: 2006 Construction Standard CS1: 2010 7 ACI 214R-1
• Acceptance testing and criteria are give in Section 8.2 ... • Test methods for determining compressive strength • Section 16 • Test methods for determining density . 23 . ... • Procedures carried out in accordance with Sections 12 and 16 of Construction Standard CS1: 2010 ...
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