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LABORATORY ASSESSMENT OF THE PERMEABILITY AND DIFFUSION CHARACTERISTICS OF FLORIDA CONCRETES: PHASE II. FIELD SAMPLES AND ANALYSES
Citation:
Snoddy, R. LABORATORY ASSESSMENT OF THE PERMEABILITY AND DIFFUSION CHARACTERISTICS OF FLORIDA CONCRETES: PHASE II. FIELD SAMPLES AND ANALYSES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-95/103 (NTIS PB95243168), 1995.
Description:
The report gives results of a study to: (1) establish the capability of measuring concrete's permeability and diffusivity, (2) measure these parameters in a small sampling of the typical types of Florida concrete, and (3) if possible, correlate the physical parameters of the concrete (mix design, porosity, etc.) to the measured diffusion and permeability coefficients. ample permeability was measured and analyzed with a device developed for the project. he diffusion coefficient was determined using a system also developed for the project. he statistical analysis consisted of: (1) a stepwise search using an Efromyson-type search methodology, (2) a standard linear-modeling, least-squares approach to evaluate individual variables and sets (up to sets of three), and (3) a robust or least-median-square methods to further evaluate possible correlations and examine the dataset for outliers. or both permeability and diffusivity, the amount of water added to the mix at the site was directly and positively related and identified as a possible major factor. he data indicated that the total amount of sand and stone in the mix was possibly correlated to permeability. hird possible correlation involved the amount of fly ash or the cement-to-fly- ash ratio.
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LABORATORY ASSESSMENT OF THE PERMEABILITY AND DIFFUSION CHARACTERISTICS OF FLORIDA CONCRETES: PHASE II. FIELD SAMPLES AND ANALYSES