Concrete Dry Quantitiesexamples in class

Week 3

Dry Mix Quantities – Review

Above for 1.0m³ of concrete

• 3m³ Concrete at 4:2:1 mix.• shrinkage, use 1.4m³ dry for

1.0m³ fluid concrete.• 4+2+1 = 7 parts total• 1.4 x 4 = 0.8m³ 7 1.4 x 2 = 0.4m³ 7 1.4 x 1 = 0.2m³ 7

• Therefore for 3.0m³ of concrete

• 0.8 x 3 = 2.4m³ aggregate• 0.4 x 3 = 1.2m³ sand• 0.2 x 3 = 0.6m³ cement

Quantities Continued• 4.8m³ Concrete at 5:2:1

mix.• shrinkage, use 1.4m³ dry

for 1.0m³ fluid concrete.• 5+2+1 = 8 parts total• 1.4 x 5 = 0.875m³ 8 1.4 x 2 = 0.350m³ 8 1.4 x 1 = 0.175m³ 8

• Therefore for 3.0m³ of concrete

• 0.875 x 4.8 = 4.2m³ aggregate

• 0.350 x 4.8 = 1.680m³ sand

• 0.175 x 4.8 = 0.840m³ cement

Above for 1.0m³ of concrete

Quantities Continued• 2.5m³ Concrete at 4:2:1

mix. shrinkage, use 1.4m³ dry

for 1.0m³ fluid concrete.• 4+2+1 = 7 parts total• 1.4 x 4 = 0.8m³ 7 1.4 x 2 = 0.4m³ 7 1.4 x 1 = 0.2m³ 7

• Therefore for 2.5m³ of concrete

• 0.8 x 2.5 = 2.0m³ aggregate

• 0.4 x 2.5 = 1.0m³ sand• 0.2 x 2.5 = 0.5m³

cement

Above for 1.0m³ of concrete