1. Pontificia Universidad Católica de Chile, School of Engineering, Casilla 306, Correo 22, Santiago, Chile (corresponding author).
2. Graduate Research Assistant, School of Civil Engineering, Purdue Univ., School of Civil Engineering, 550 Stadium Mall, West Lafayette, IN 47907-2051.
3. Professor and Director of Pankow Materials Laboratory, Associate Director of the Center for Advanced Cement Based Materials, Purdue Univ., School of Civil Engineering, 550 Stadium Mall, West Lafayette, IN 47907-2051.