Preliminary study to develop standard acceptance tests for pervious concrete.
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2017-05-01
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Abstract:Pervious concrete pavements are permeable pavement systems that are desired for their role in stormwater management and runoff control. Increased popularity in pervious concrete pavement applications has raised the need for the development of quality control and quality-evaluation test procedures that are suitable for pervious concrete compared to traditional concrete. This brief study took a few preliminary steps in this direction by investigating the effect of specimen size on physical properties of pervious concrete such as hardened porosity and density as well as compressive strength (f’c). Moreover, the effect of four different curing regimens with combined air and moist curing over the four-week curing period on the 28-day f’c for both specimen sizes was investigated. Pervious concrete for this project was sampled from a Washington State Department of Transportation (WSDOT) paving project located on Vashon Island Ferry Terminal. Forty-eight four-inch and 40 six-inch diameter cylinders were cast and tested as part of the study. The results suggested that the four and six-inch diameter cylinders tested in the project demonstrated comparable values of hardened porosity and density, implying that either size specimen is suitable for quality control of such physical properties. Hardened density obtained in the laboratory for cast cylinders was within two percent or less of the fresh density obtained for the mixture in the field, which shows the suitability of the implemented specimen casting and compacting methods. Compressive strength of small cylinders was higher than that of large cylinders by 8- 19%, depending on the curing method. The combination of two weeks of air curing and two weeks of moist curing resulted in the highest 28-day f’c for both specimen sizes. On the other hand, four weeks of air curing yielded the lowest f’c among the tested specimens. This trend was confirmed by thermogravimetric analysis conducted on cement paste samples from the four curing categories, which showed that moisture curing resulted in leaching of C-S-H and Ca(OH)2 from the paste. The findings of the study need to be expanded in the future to include more mixtures and testing.
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