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This software package is a public domain product of the U.S. government, and as such is available free of charge. If it is desired to incorporate this software into a commercial package, this software must be credited properly as a product of NIST. In addition, it is illegal to use NIST's name in advertising. For example, it is illegal to claim that a commercial software package is "NIST-approved" just because the commercial package incorporates a version of the VCCTL. Another example would be claiming a special relation with NIST just because the company is using a version of the VCCTL. This conditions apply to all NIST software, not just the VCCTL.
User's guide to the NIST VCCTL: Virtual Cement and Concrete Testing Laboratory. Version 1.1 (PDF Version)
Access the VCCTL software online
Download manual (NISTIR #6583) (postscript versions).