： The objective of this study is to investigate the effect of adding mineral admixtures and secondary wet curing on surface layer quality and durability of steam cured mortar. In order to evaluate the surface layer quality of mortar, air permeability was tested using the Torrent Permeability Tester method and the microstructure development was studied by mercury intrusion porosimetry. Chloride ion penetration resistance was measured by the Colorimetric method and the EPMA, and it was used to assess the durability of mortar. The main findings of this study are；1）Secondary curing improves compressive strength, air permeability and chloride ion penetration resistance of steam cured mortars, and adding mineral admixtures improve a chloride penetration resistance. 2）Secondary curing and adding mineral additives affect the mortars microstructure. It is considered that the change of microstructure contribute to improvements in air permeability and chloride ion permeation resistance.
Y. Azuma, H. Mori, K. Tada
Cement Science and Concrete Technology