In recent years, the research related to agricultural wastes aiming to evaluate their potential for recycling as well as the elimination of the landfills increased dramatically. The current project focus on the use of quasi-elastic neutron scattering (QENS) experiments on the role of water in mature concrete produced using different Brazilian sugar cane bagasse ashes from the co-generation industry. These ashes are recognized as having pozzolanic properties, and can therefore be used as alternative supplementary cementitious materials for concrete production. The durability of concrete is related to its ability to limit fluid transmission and knowledge of how to reduce the water mobility is critical to improving durability. QENS is a unique technique for such investigation as it probes both dynamic and geometric aspects of the protons motions in very short time scale.