The Carbonation of Mortar Containing Limestone Powder

Carbonation of mortar was examined when limestone powder was substituted for cement, water and sand.In addition, the influence of factors such as total porosity, air content and unit cement content oncarbonation of mortar were considered. The total porosity of mortar defined in this paper as porosity which includes the influence of air content is an important consideration of carbonation. The amount of carbon dioxide which penetrates mortar is determined by its total porosity. The carbonation coefficient decreases linearly with a decrease in total porosity, due to the linear decrease of carbon dioxide penetrating the mortar. The penetration rate of carbon dioxide is controlled by the unit cement content. As a result, the carbonation coefficient is inversely proportional to the unit cement content of mortar.