Question 2 The concrete mix design will be carried out according to the British Building Research Establishment method. Calculate the proportions of cement, water and aggregates for 1m3 of concrete (in kg). The following requirements are specified: a) Target mean compressive strength = 25 MPa at 7 days. b) Portland cement class is 42.5. c) Slump required is 30-60 mm. d) Maximum aggregate size is 20 mm. e) Maximum cement content is 350 kg/m3. Additional information: - The fine and coarse aggregates to be used are crushed; the bulk density is unknown, - The fine aggregate has 40% passing a 600μm sieve, - Two types of coarse aggregates are used: 10 mm and 20 mm
Question 2 The concrete mix design will be carried out according to the British Building Research Establishment method. Calculate the proportions of cement, water and aggregates for 1m3 of concrete (in kg). The following requirements are specified: a) Target mean compressive strength = 25 MPa at 7 days. b) Portland cement class is 42.5. c) Slump required is 30-60 mm. d) Maximum aggregate size is 20 mm. e) Maximum cement content is 350 kg/m3. Additional information: - The fine and coarse aggregates to be used are crushed; the bulk density is unknown, - The fine aggregate has 40% passing a 600μm sieve, - Two types of coarse aggregates are used: 10 mm and 20 mm
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Question 2
The concrete mix design will be carried out according to the British Building Research
Establishment method. Calculate the proportions of cement, water and aggregates
for 1m3 of concrete (in kg).
The following requirements are specified:
a) Target mean compressive strength = 25 MPa at 7 days.
b) Portland cement class is 42.5.
c) Slump required is 30-60 mm.
d) Maximum aggregate size is 20 mm.
e) Maximum cement content is 350 kg/m3.
Additional information: The fine and coarse aggregates to be used are crushed; the
bulk density is unknown, - The fine aggregate has 40% passing a 600μm sieve, - Two
types of coarse aggregates are used: 10 mm and 20 mm
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