Examination of durablity of high performance concrete (hpc) that has been subjected to MgSO4 and NaCl corrosion against freezing and thawing

Abstract

In this study, freezing and thawing effect over four different high performance concrete (HPC) (0P15Z "0% Pumice + 15% Zeolite", 5P10Z, 10P5Z and 15P0Z) which has been waited in three different cure medium (H2O, MgSO4 and NaCl) for two years was examined. For this reason, four type of High Performance Concrete (HPC) was produced to substitute for, instead of cement. The produced concretes was cured in lime saturated water of 23 +/- 2 degrees C, 7500 Mg/ L MgSO4 and 5% NaCl solutions for two years. Before starting the freezing and thawing cycle over the concretes, ultrasonic pulse velocity values were obtained by 28 days of compressive strength. The freezing and thawing experiment over the samples taken out of the cure mediums at the end of two years was made regarding fast freezing thawing in air from ASTM C 666 standard. At the end of 30 freezing and thawing cycle, concrete compressive strength, weight loss, ultrasonic pulse velocity and durability factor over the samples were determined. The results of the experiment proved that there are important differences in, between values due to mineral admixture type and cure medium.