Community Research and Development Information Service - CORDIS

High alumina cement becomes stronger

An innovative process involving the addition of manganese oxides in high alumina cement results in significant cost and energy savings and improved quality of the final product.
High alumina cement becomes stronger
High Alumina Cement (HAC) is a type of cement that can produce excellent concrete. Due its extraordinary properties, including high early strength, good chemical resistance and high temperature resistance, the use of HAC is greatly promoted for construction and refractory purposes. In combination with other types of cement, such as Portland cement or plaster or silica fume, HACs are mainly used for implementing complex formulations in the construction industry.

HAC comes from burning or sintering raw materials including calcium carbonate, aluminum oxide, silica and iron oxide at high temperature. Manufactured chemical substances are confined in a crystalline mass. Recent research showed the potential of incorporation of manganese in these crystal structures. These studies also involved measurements of hydration characteristics and strength development properties.

More specifically, it was proven that the addition of manganese oxides to the raw meal of a typical HAC results in the formation of HACs with increased reactivity. Moreover, it was also showed that production temperature became lower offering substantial energy savings. At the same time costs of raw material were found to be less than those spent on production of formations of HACs that are manganese-free.

The new HAC mixtures display a better weathering stability and an improved early strength development. Additionally, because of their excellent strength development, this sort of cement displays increased potentialities to be used in complex applications in the construction industry. Although collaborations are sought with manufacturers of HACs for licence agreements, other types of co-operation may also be discussed.
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