until the next working day the required amount of fresh concrete is then mixed into the reclaimed concrete the temperature is again measured and the required amount of accelerator and if required of water reducing agent is calculated again addition may be carried out under automatic computer control in the following table iii are various retarding compositions in fluid ounces fl oz of solution per 100 lbs of cementitious material of formulation r of this invention the compositions are based on 3 the length of time of retardation of set of the concrete desired e g overnight about 18 24 hours or over a weekend about 48 72 hours table iii______________________________________overnight dosageconcrete for up to for more than u00b0 f 1 5 cu yd 1 5 cu yd weekend dosage______________________________________90 99 55 fl oz 70 fl oz 145 fl oz 80 89 50 fl oz 65 fl oz 135 fl oz 70 79 40 fl oz 55 fl oz 125 fl oz 60 69 35 fl oz 45 fl oz 115 fl oz 50 59 25 fl oz 25 fl oz 105 fl oz 40 49 20 fl oz 20 fl oz 95 fl oz 32 39 15 fl oz 10 fl oz 85 fl oz ______________________________________ the.