Design a concrete mix for the following performances and ingredients: • Characteristic compressive strength 50 N/mm2 at 7 days • Defective rate 1 % • Previous control data: standard deviation 5 N/mm2 • Cement: class 52.5 • Slump required, 30-60 mm • Maximum cement content 550 kg/m3 • Coarse aggregate: Crushed single sized 10 mm • Fine aggregate: Uncrushed with 45% passing 600 μm sieve • Relative density of aggregate : 2.7 (assumed) • Volume of trial mix : 0.08 m3 Note: the constant k used to find the margin, which is in turn used to determine the target compressive strength is as shown the table below: k for 10 % defectives = 1.28 k for 5% defectives = 1.64 k for 2.5% defectives= 1.96 k for 1% defectives= 2.33
Design a concrete mix for the following performances and ingredients:
• Characteristic compressive strength 50 N/mm2 at 7 days
• Defective rate 1 %
• Previous control data: standard deviation 5 N/mm2
• Cement: class 52.5
• Slump required, 30-60 mm
• Maximum cement content 550 kg/m3
• Coarse aggregate: Crushed single sized 10 mm
• Fine aggregate: Uncrushed with 45% passing 600 μm sieve
• Relative density of aggregate : 2.7 (assumed)
• Volume of trial mix : 0.08 m3
Note: the constant k used to find the margin, which is in turn used to determine the target compressive strength is as shown the table below:
k for 10 % defectives = 1.28
k for 5% defectives = 1.64
k for 2.5% defectives= 1.96
k for 1% defectives= 2.33
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