Using of Synthetic Zeolites for preparation of Structural light concrete

Use of industrial wastes as additives for cement materials reduces the consumption of energy in the manufacture of building materials by partial substitution of cement, but it contributes also to the environment protection. Hydrated calcium silicates (the socalled C-S-H phase) that constitute almost 80% by volume of hydrated cement can stabilize various kinds of waste materials, also those including heavy metals [1]. In many cases, the use of industrial wastes as cement additives promotes also the development of building industry. An ideal example is the utilization of silica dusts, which is a side product of metallurgical industry, for manufacture of high strength concretes but the influence of microsilica on the hydration process and properties of concrete is still studied. The synthetic zeolite admixture, thus, may be expected to have pozzolana properties, just like naturally occurring zeolites as well as silica dusts and fly ashes containing active silica [9]. The aim of this work was to compare the effect of spent catalyst, microsilica, and fly ashes on the course of hydration of cement pastes.