Influence of alum and soap solutions of the permeability of concrete . y it would be advisable to use somemethod or device for obtaining uniform pressure for use infuture experiments. best ratio of soap to alum to be used,however^ by taking thevarious ratio of soap to alum and comparing their average totalflow as given in the table following,,the solution of soap alone No conclusive deductions can be drawn as to the Soap, Alum, Average Total flowin grams. Average f lo«^ on7th day in gr. 0 0 1600 43 2 0 1445 45 1 1 1550 45 2 1 1500 41 \. 24, has the least percolation but the average rate of flo
Influence of alum and soap solutions of the permeability of concrete . y it would be advisable to use somemethod or device for obtaining uniform pressure for use infuture experiments. best ratio of soap to alum to be used,however^ by taking thevarious ratio of soap to alum and comparing their average totalflow as given in the table following,,the solution of soap alone No conclusive deductions can be drawn as to the Soap, Alum, Average Total flowin grams. Average f lo«^ on7th day in gr. 0 0 1600 43 2 0 1445 45 1 1 1550 45 2 1 1500 41 \. 24, has the least percolation but the average rate of flow on the7th day is in favor of the 2 : 1 ratio. The amounts of soap andof alum that might be used in the ratio of 2 :1 with the bestresults is shown by the curve on page 25 which was plotted afterthe percolation had become uniform. The curve shows that thedisks which contained about 2% soap and ifo alum gave the bestresults. The variations in the results indicate the necessityof careful supervision and careful v/ork on construction wherewaterproofing is being
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