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As a project engineer, you have been requested to produce a report documenting your selection of an appropriate concrete mix to use to replace sections of reinforced concrete footings used to support reinforced concrete towers in a bridge structure that have deteriorated due to sulphate attack (e. g., replacing sections of the large reinforced concrete footings used to support the concrete flanking towers on the Anzac Bridge in Sydney, New South Wales). Select the concrete mix from the candidate concrete mixes available in the accompanying spreadsheet (i. e., candidate concretes’ test data) available on UTSOnline to meet the following three (3) performance characteristics: ï‚· Ability of the concrete to be placed into formwork sections that have restricted access and contain congested reinforcement ï‚· Ability of the reinforced concrete sections to resist high compressive loads and high bending moments ï‚· Ability of the reinforced concrete sections to endure the environmental conditions of C2 exposure classification as defined in the AS 3600 Concrete Structures standard Question 1 ï‚· Describe the laboratory equipment needed and techniques used to measure each of the concrete properties given in the spreadsheet Question 2 ï‚· Describe how the properties of the concrete mixes given in the spreadsheet may be used to determine the desired performance characteristics (i. e., ability to be placed into congested reinforcement sections, ability to resist compressive loads and bending moments and ability to endure C2 exposure classification) Question 3 ï‚· If you wanted to enhance the properties of a reinforced concrete member, whose surfaces will be in contact with the ground and seawater, describe the features of the environment and the concrete that need to be taken into account. Please also explain how these features will influence the durability aspects of the reinforced concrete member. Question 4 ï‚· Use the data provided in the spreadsheet to justify your choice of concrete mix (i. e., concrete mix A, B, C or D) to meet the desired performance characteristics (i. e., ability to be placed into congested reinforcement sections, ability to resist compressive loads and bending moments and ability to endure C2 exposure classification)
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Question 5 ï‚· If the concrete mix selected in Question 4 is used to construct a reinforced concrete bridge deck (i. e., a surface element in a bridge structure), describe how the properties given in the spreadsheet may be used to determine the ultimate specific creep of the concrete used to construct this surface element. Please also explain what impact the ultimate specific creep will have on the performance of the bridge deck.
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