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EPA: LAG No. DW-13-93903501-0 Expanding a Tool for Predicting Chloride Diffusivity in Concrete So It Can Be Used by Manufacturers to Evaluate the Durability of Concrete Made With Blended Cements. Part I: Characterizing Blended Cement Materials. Final Report


pdf icon EPA: LAG No. DW-13-93903501-0 Expanding a Tool for Predicting Chloride Diffusivity in Concrete So It Can Be Used by Manufacturers to Evaluate the Durability of Concrete Made With Blended Cements. Part I: Characterizing Blended Cement Materials. Final Report (1028 K)
Feng, X.; Garboczi, E. J.; Bullard, J. W.; Bentz, D. P.; Snyder, K. A.; Stutzman, P. E.; Mason, T. O.

NISTIR 7135; 37 p. August 2004.

Keywords:

concretes; cements; chloride diffusion; diffusivity; fly ash; blended cements

Abstract:

This report summarizes a project that dealt with the characterization of a fly ash and fly-ash blended cement material, so that these could be incorporated into the Virtual Cement and Concrete Testing Laboratory (VCCTL) software. The information generated from this project will be transferred to the members of the consortium, who represent all parts of the concrete materials community cement production, chemical admixtures, aggregates, and ready-mixed concrete manufacture. Eventually, all the VCCTL software will be publicly accessible, but since new features developed by the consortium are not released to the public for three years, joining the VCCTL consortium will allow quicker access to the software. Products of this partially EPA-funded project include: a method for predicting the conductivity of pore solutions where the concentration of [Na]+ and [K]+ ions are known, unique experimental data on the hydration of cement and the consumption of fly ash in a fly ash blended cement, experimental data on the electrical conductivity of blended cement pastes made from these materials, and model modifications that allow for more quantitative modeling of blended cement hydration and microstructure formation. This project has turned out products that will allow much greater progress in the future in the area of modeling blended cements.