We are working on previous concrete for increasing in strength without compromising the permeability. So in-view of this , we would like to use super plasticisers in pervious concrete.
I am wordering if the adjective 'pervious'' concrete is intended? If, as suggested in the question, that permeability should not be compromised, then has (in addition to super-plasticiser) microsilica/silica fume been considered. The basic aim of all, besides workability, is surely to reduce the w/(C+F) water/(cement+filler) ratio, which automatically reduces the porosity and therefore the permeability. Those at least are the arguements used concerning stronger and less permeable'' shotcrete - which with fiber-reinforcement can have extremely low permeability.
I now see that my answer is diametrically opposite what was wanted - sorry? So you mant the permeability for pavement design - n!eow seen in lengthened question. needed
The maximum dosage of superplasticiser depends upon the type of superplasticiser and is recommended for each type by its manufacturer. However, performance tests are compulsory to determine the maximum dosage. The normal range of dosage is 1 to 3 litres per cubic meter. So 3 liters per cubic meter may be taken as the maximum dosage. Moreover, some quantity of fine aggregate (sand) is required to be mixed with porous concrete (cement + water + coarse aggregate) in order to get sufficient strength in addition to permeability. The addition of Fly ash, silica fume and other pozzolons may be avoided as they reduce the permeability drastically.
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