Carbonation Effects and Its Mitigation Measures in Concrete/Cement Mortar Mass Made of Cent Percentage Recycled Coarse and Fine Aggregates

The recycled demolished concrete aggregate obtained from processing unit contains the maximum amount of calcium hydroxide (lime) and these lime in reaction with atmospheric carbon dioxide and forming a calcium carbonate and reducing the PH of the aggregates and making the aggregates mass carbonated. These carbonated aggregates when used in concrete/cement mortar results in intense carbonated mass with PH of the mass less than 9 and thereby damaging the mass and rendering it unfit for its intended use. The research deals with the process and technique dealing with improving the surface and internal structure of the recycled aggregate mass obtained from processing plants and making it fit for its usage in production of concrete /cement mortar mass and analyzing the process of the carbonation in the concrete/cement mass prepared with conventional and treated and untreated demolished concrete coarse and fine aggregates. The results obtained have shown a surface modification and surface treatment methods founds to be an effective solution countering the carbonation of the aggregates and the treatment helps in retaining the hydroxide ion concentration (OH- ) and its usage in the concrete/cement mortar mass helps in retaining the alkalinity at par with conventional concrete and makes mass more dense and self resilient.