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For slip-form curb or barrier wall, what mix design or slump do you recommend?

For a typical curb:
Contents Cubic Yard Cubic Meter
Sand 1500# 891 kg
Cement 540# 321 kg
Coarse Aggregate 1600# (1/2" - 13mm) 951 kg
Water 39 gallons (320#) 193 liters
Air 4% - 6% 4% - 6%
1-1/2" - 2" Slump 3000 psi

For a typical barrier/parapet:
Contents Cubic Yard Cubic Meter
Sand 1400# 321 kg
Cement 700# 891 kg
Coarse Aggregate 1700# (1/2" - 19mm to 25mm) 1011 kg
Water 32 gallons (320#) 158 liters
Air 4% - 6% 4% - 6%
1" Slump 4000 psi