1. Had to replace a set of test section and are ready to experiment
2. Experimental studies and two methods to calculate the porosity
.Method 1 sponge cut to size 1 × 1 cm2 scale. 5 ml distilled water and leave it for one night, then take a sponge bath and weighed again to calculate the percentage of porosity by
.Method 2 sponges cut to size 1 × 1 cm2 scale. 5 ml distilled water and leave it for one night, then squeeze out the water in the sponge weighing. And calculate the percentage of porosity.
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