This user's manual provides guidance for using Version 1.0 of the NIST Virtual Cement and Concrete Testing Laboratory (VCCTL). This virtual laboratory consists of a web-based interface and underlying computer models and programs that allow the user to create, hydrate, degrade, and evaluate 3-D cement-based microstructures from their desktop computer. Thus, the VCCTL should serve the cement and concrete research and development community, ultimately reducing the number of costly physical concrete tests needed, while also allowing the rapid analysis of a wide variety of "what if" type scenarios.
The main underlying program for the VCCTL (CEMHYD3D) has been described previously [1], as well as numerous applications based on using the underlying models [2-7]. This user's manual therefore provides a detailed description of the web-based user interface and a few examples of using the VCCTL to investigate specific problems of interest to the cement and concrete research community. The VCCTL is available online at http://ciks.cbt.nist.gov/vcctl. It is suggested that the user be connected to this web site as they read this user's manual in order to help clarify the forms, the inputs needed, and the results produced for the various menu selections.
This software was developed at the National Institute of Standards and Technology by employees of the Federal Government in the course of their official 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. The VCCTL is an experimental system. NIST assumes no responsibility whatsoever for its use by other parties, and makes no guarantees, expressed or implied, about its quality, reliability, or any other characteristic. We would appreciate acknowledgement if the software is used.
The U.S. Department of Commerce makes no warranty, expressed or implied, to users of the VCCTL and associated computer programs, and accepts no responsibility for its use. Users of the VCCTL 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.
Users are warned that the VCCTL is intended for use only by those competent in the field of cement-based materials and is intended only to supplement the informed judgment of the qualified user. The software package contains computer models which may or may not have predictive value when applied to a specific set of factual circumstances. Lack of accurate predictions by the models could lead to erroneous conclusions with regard to materials selection and design. All results should be evaluated by an informed user.
The algorithms, procedures, and computer programs described in this report constitute a prototype system for a virtual laboratory for the testing of cement and concrete. They have been compiled from the best knowledge and understanding currently available, but have important limitations that must be understood and considered by the user. The VCCTL system is intended for use by persons competent in the field of cement-based materials and with some familiarity with computers. It is intended as an aid in the materials selection, optimization, and design process.