OF FREEZING AND THAWING DURABILITY ON SCALING OF ECO-CEMENT EXTREMELY DRY CONCRETE UNDER DEICING AGENT CONDITION

Eco-cement is developed for long-term use of land. ll areas near large cities and natural resource conservation during cement production in Japan. It mainly consists of incinerated ash from combustible city wastes as raw material, which is burnt in a rotary kiln to produce clinker similar to ordinary portland cement. Therefore, it is expected to enhance the sustainability of concrete production compared to its ordinary portland cement counterpart. This study addresses the mechanical properties of eco-cement-based extremely dry concrete for roller compacted concrete pavement (RCCP) and its freezing and thawing durability. Despite its adequate mechanical properties for pavement use, the material shows a relatively high decrease in mass compared to ordinary portland cement mixture during freezing and thawing tests in the presence of a deicing agent. Therefore, ground granulated blast-furnace slag and limestone powders with higher specific surface areas than both cements are added to improve the scaling behavior under deicing conditions. These mineral admixtures enhance the scaling property of the eco-cement-based extremely dry concrete in the presence of a deicing agent. Moreover, CO2 emission and utilized waste mass are estimated in units of volume of concrete mixtures to evaluate environmental performances.