Farshad Rajabipour, graduate student, was awarded first place in poster contest for his work on the development of a sensor for assessing drying in concrete during the Spring 2006 meeting of the Center for Advanced Cement Based Materials. The "Electrical Conductivity of Drying Cement Paste" study characterizes the electrical conduction in cement paste subjected to drying (desorption) and moisture absorption. The study quantifies how the electrical conductivity is dependent on the volume and connectivity of the moisture inside the pores and the conductivity of pore solution. This poster also presents a procedure to quantify the contribution of the surface (solid-pore) conduction on the overall conductivity of the cement paste. The results of this investigation contribute to the development of an embedded relative humidity sensor that can be used to monitor moisture changes in concrete during its service life.