Durability and Meso Interfacial Transition Zone Optimization of Reinforced Concrete Cover
GAO Ying li,MA Bao guo,WANG Xin gang,ZHOU Ding hua,LUO Zhong tao and PAN Wei
DOI:10.11835/j.issn.1674-4764.2009.04.005
Received ,Revised , Accepted , Available online July 01, 2015
Volume ,2009,Pages 19-24
- Abstract
Aiming at the low service life and bad durability of the traditional concrete structure and concrete cover, the high dense concrete cover (HDC) was produced with the optimization of interfacial transition zone in meso scale(50 100μm) between cement mortar and aggregate of the ordinary concrete. Moreover, some properties of HDC were studied, including the impermeability, the anti corrosion behavior, anti acidic gas corrosion and freeze resistance. It was shown that the impermeability of HDC was excellent with very low permeability. Compared with ordinary concrete, the anti corrosion behavior of HDC was remarkably strengthened. And under the condition of erosion accelerated by CO2 and SO2, the freeze resistance such as the appearance after freezing and thawing, mass loss and relative dynamic modulus of HDC was better than that of ordinary concrete and neutralization depth of 90 day was less than 1 mm. On the other hand, the results of Scanning Electron Microscope (SEM) experiment indicated that the size of interfacial transition zone of HDC was effectively reduced and the microstructure compactness of concrete was increased. Therefore, it was found that the special producing technology and characteristics of HDC can improve the durability, and then the service life of structure was increased effectively.