Problem 1: Concrete is required for internal columns of a building. The specified strength is 25 MPa at 28 days and it is required that no more than 1 test result in 20 will fall below the specified strength. The concrete testing history of 50 tests, carried out by the construction company for the same concrete grade, indicated a standard deviation of 3 MPa. The size of the column sections and the spacing of steel require slump of 80 mm and Dmax of 20 mm. The fine aggregate have FM of 2.665, and absorption of 2%, BSG (SSD) of 2.6. The CA have bulk density of 1500kg/m³; absorption of 4% and BSG (SSD) of 2.50. The moisture content for both

Problem 1: Concrete is required for internal columns of a building. The specified strength is 25 MPa at 28 days and it is required that no more than 1 test result in 20 will fall below the specified strength. The concrete testing history of 50 tests, carried out by the construction company for the same concrete grade, indicated a standard deviation of 3 MPa. The size of the column sections and the spacing of steel require slump of 80 mm and Dmax of 20 mm. The fine aggregate have FM of 2.665, and absorption of 2%, BSG (SSD) of 2.6. The CA have bulk density of 1500kg/m³; absorption of 4% and BSG (SSD) of 2.50. The moisture content for both

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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Concrete is required for a column that will be Severe Exposure to freezing and thawing. The cross section of the column is 300 × 300 mm. The smallest spacing between reinforcing steel is 40 mm. The specified compressive strength of concrete at 28 days is 40 MPa with a slump of 25 to 50 mm. The properties of materials are as follows: (a) Cement used is type I Portland cement with a specific gravity of 3.10. (b) The available coarse aggregate has a maximum size of 23 mm, a dry-rodded unit weight of 1800 kg/m3, a bulk specific gravity (SSD) of 2.68, absorption capacity of 0.65%, and moisture content (SSD) of 0.27%. (c) The fine aggregate has a bulk specific gravity (SSD) of 2.75, absorption capacity of 1.5%, a moisture content (SSD) of 2.5%, and a fineness modulus of 2.7,The aggregates conform to the ASTM C33-84 requirements for grading.
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