MIX DESIGN: CONCRETEPROPORTIONING OF CONCRETE

Left 50%

Right50%

NORMALISED DISTRIBUTION

95%

5%

DesignSD depends on QC

5% 2%1.65 XX>1.65

5% 10%1.65 XX<1.65

Tm = fck + Kσ

VALUES OF K

Percentage of result below the

Characteristic strength

K

50 016 1.010 1.285 1.65

2.5 1.961.0 2.330.5 2.580.0 Infinity

(w/c ratio )1 > (w/c ratio )2

s/a =0s/a =1

The end