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

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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3. A concrete mix includes the following ingredients per cubic foot: (14 pts.) = 25 lbs. = 11 lbs. Cement Water No Admixture Table shows possible changes that can be made to the mix ingredients. Indicate in the appropriate boxes in the table what will happen in each case for the workability and the ultimate compressive strength as increase, decrease, or approximately the same. What WIlII Happen? Ultimate Compressive Strength Cement (Ib) Water (Ib) Admixture Workablity None 25 28 15 11 None Water reducer Water reducer Superplasticizer Air entrainer Accelerator 25 11 25 8. 25 11 25 11 25 11
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What is the amount of cement in kilograms needed for the design mix? Use two decimal places
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What is the amount of entrapped air (percent)? Use two decimal places
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Design the concrete mix according to the following conditions:Design Environment• Concrete slabo Subjected to freeze and thaw.o Required design strength = 21 MPao Slab thickness = 300 mm.o Statistical data indicate a standard deviation of compressive strengthof 1.7 MPa is expected (more than 30 samples).• Only air entrainer is allowed.• Available Materials:o Air entrainer:▪ Manufacture specification is 9.5 mL/1% air/100 kg cement.o Coarse aggregate:▪ 25 mm nominal maximum size▪ Crushed stone▪ Bulk oven-dry specific gravity = 2.573▪ Absorption = 2.8▪ Oven-dry rodded density = 1922 kg/m3▪ Moisture content = 1o Fine aggregate:▪ Natural sand▪ Bulk oven-dry specific gravity = 2.540▪ Absorption = 3.4▪ Moisture content = 4.5▪ Fineness modulus = 2.60o Cement:▪ Type I Cement▪ Specific gravity = 3.15…
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