ASSESSMENT OF CHLORIDE PENETRATION INTO FIBRE REINFORCED CONCRETE UNDER LOADING

摘要

Concrete structures in service time are always subjected to loading due to their nature as a load bearing element. In this condition also, it is subjected to aggressive environmental condition such as chloride penetration that would eventually cause corrosion on the reinforcement. To have a better precision on the service life time of structure against chloride penetration, more study should be performed for chloride penetration into concrete under loading condition. The experimental study in this research was conducted by modifying chloride migration test to include axial stress on the specimen at the testing period. Fibre inclusions in the concrete could alter crack development in the concrete under loading and this condition could also change the durability performance of fibre reinforced concrete. To investigate the effect of loading, plain concrete and three types of polypropylene fibre reinforced concrete were tested against chloride penetration under compressive and tensile loading. The results from the experiment showed that the polypropylene fibre reinforced concrete have a better performance against chloride penetration, with the shorter fibre giving better performance. It was also shown that when concrete subjected to tensile loading, there was a significance decrease of the resistance against chloride penetration. The relation of chloride penetration to the microcracks measurement also showed that there was a relationship between the increase of microcracks and the increase of chloride penetration.