Influence of water-to-cement on hydration kinetics: Simple models based on spatial considerations by Dale P. Bentz Building and Fire Research Laboratory National Institute of Standards and Technology Gaithersburg, MD 20899 USA Reprinted from Cement and Concrete Research, Vol. 36, No .2, pp. 238-244, 2006. NOTE: This paper is a contribution of the National Institute of Standards and Technology and is not subject to copyright.