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Virtual Cement and Concrete Testing Laboratory: Version 9.5 User Guide



Jeffrey W. Bullard


This document serves as the user’s guide for the Virtual Cement and Concrete Testing Laboratory (VCCTL) software, version 9.5. Using the VCCTL software, a user may create 3D microstructures of cement paste made with clinker, calcium sulfate, fly ash, slag, limestone, and other materials. Hydration of these microstructures can be simulated under a variety of curing conditions, and the resulting hardened material can be analyzed for a number of properties including linear elastic moduli, compressive strength, and relative diffusion coefficients. A 3D packing of fine and coarse aggregates in mortar and concrete materials also can be created. The VCCTL software uses a relational database and plotting capabilities to facilitate viewing important characteristics of cement powders, supplementary cementitious materials, fillers, and aggregates.
Special Publication (NIST SP) - 1173
Report Number


building technology, cement hydration, computer modeling, concrete testing, microstructure, simulation, virtual laboratory


Bullard, J. (2014), Virtual Cement and Concrete Testing Laboratory: Version 9.5 User Guide, Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD, [online], (Accessed April 16, 2024)
Created May 29, 2014, Updated November 10, 2018