Concrete Technology DOE method

[sro2ck]

In DOE method,
if slump has been specified as 30mm. so, should i take (10-30)mm interval datas
Or
(30-60)mm interval datas for my calculations.

 

[sro2ck]

Also,for determining Maximum and minimum water content, specification table is given only for aggregates of 20mm Nominal Maximum
size.Can any one suggest where can i get specification table for aggregates of 40mm Nominal Maximum size.