Weigh out two separate one Kg samples of concrete and place each sample in a wide-mouth bottle. Add 500- ml to 0.5 N sodium chloride solution to one bottle (sample) and 500-ml of distilled water to the other bottle (blank).
Weigh out two separate one Kg samples of concrete and place each sample in a wide-mouth bottle. Add 500-ml to 0.5 N sodium chloride solution to one bottle (sample) and 500-ml of distilled water to the other bottle(blank).