This software was developed at the National Institute of Standards and Technology (NIST) by employees of the Federal Government in the course of their offcial duties. Pursuant to Title 17 Section 105 of the United States Code this software is not subject to copyright protection and is in the public domain. NIST assumes no responsibility whatsoever for the use of this software by other parties, and makes no guarantees, expressed or implied, about its quality, reliability, or any other characteristic. NIST would appreciate acknowledgment, such as an appropriate citation in a publication, if the software is used.
The U.S. Department of Commerce makes no warranty, expressed or implied, to users of VCCTL, and accepts no responsibility for its use. Users of the software assume sole responsibility under Federal law for determining the appropriateness of its use in any particular application; for any conclusions drawn from the results of its use; and for any actions taken or not taken as a result of analyses performed using these tools. All results should be critically evaluated by an informed user.
The computer program described in this guide constitutes a prototype model for simulating the evolution in microstructure, solution composition, and phase abundance and composition of portland cement-based concrete binders during their hydration or subsequent deterioratation by groundwater leaching or external sulfate attack. It has been developed from the best knowledge and understanding currently available, but has some limitations that must be understood and considered by the user. This software is intended for use by persons competent in the science of cement-based materials and having some familiarity with computers.