Quiz 3 Answers.pdf - Take Test Quiz 3 Durability of...

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Unformatted text preview: 22/09/2017 Take Test: Quiz 3 Durability of Concrete (10 Random Questions)... Construction Materials Spring 2017 48352-2017-SPRING-CITY O Assessments Take Test: Quiz 3 Durability of Concrete (10 Random Questions) Construction Materials Spring 2017 Take Test: Quiz 3 Durability of Concrete [10 Random Questions] Test Information Description Instructions Multiple Attempts Not allowed. This test can only be taken once. Force Completion This test can be saved and resumed later. QUESTION 1 10 points Question 4 in Quiz 4 Which key feature will lead to the sud den failure of a prestressed concrete beam due to the action of chloride-induced corrosion? O a. The formation of considerable rust stains O b. The spalling of the concrete 0 c. The occurrence of large areas of general corrosion Q) d. The occurrence of localised areas of pitting corrosion QUESTION 2 10 points Question 7 in Quiz 4 When formulating the requirements of a concrete specification, the characteristic strength of concrete is used to represent the strength of the concrete. What does the characteristic &content_id=_2372767_. .. 1/5 22/09/2017 Take Test: Quiz 3 Durability of Concrete (10 Random Questions)... strength of concrete represent? (9a. The characteristic strength of concrete incorporates statistical variations of strength and ensures the strength in the concrete structure with a certain level of confidence 0 b. The characteristic strength of concrete will be greater than the mean strength of concrete 0 c. The characteristic strength of concrete is much easier to achieve in the field than the mean strength of concrete 0 d. The characteristic strength of concrete is the actual strength of the concrete used to construct a concrete structure QUESTION 3 10 points Question 9 in Quiz 4 A concrete mix containing steel fibres, when tested for workability, showed zero slump. l.‘lfhich ke',f feature is responsible for the observation of zero slump in the concrete mix containing the steel fibres? O a. The addition of steel fibres to the concrete mix has made the concrete mix stiff and, therefore, the concrete mix has flash set 0 b_ The concrete mix is very dry and contains an insufficient amount of water and is not workable O c. The absorption characteristics of the steel fibre reinforced concrete mix is different to a normal concrete mix and, hence, the concrete mix has become dry © d. The slump test is not a good measure of workability of fibre reinforced concrete QUESTION 4 10 points Question 3 in Quiz 4 A pre-tensioned concrete beam has undergone prestress loss at the time of load transfer to the concrete due to cutting of the tendons at the age of 1' days. Which feature of the prestressecl concrete member will most likEl'yf contribute to this loss of prestress? Q a. Slippage at the point of anchorage O b. The shrinkage component of the concrete 0 c. The creep component of the concrete Q) d. The elastic shortening of the concrete &content_id=_2372767_. .. 2/5 22/09/2017 Take Test: Quiz 3 Durability of Concrete (10 Random Questions)... QUESTION 5 10 points Question 2 in Quiz 4 Calculate the total long-term strain that will result in a reinforced concrete column [in micro strain] given the below specification requirements and performance characteristics of the concrete used to construct this column. I Average applied stress = 15 MPa I Specific creep = 40 x 10" per MPa I Long-term shrinkage strain = EDD microstrain I Static chord modulus of elasticity' = 30 GPa O a. Total long-term strain = 1,500 microstrain O b. Total long-term strain = 1,100 microstrain © 0. Total long-term strain = 1,600 microstrain Q d. Total long-term strain = 1,300 microstrain QUESTION 6 10 points Question 6 in Quiz 4 A bridge operating in a satisfactory condition in a coastal region for a period of ID vears is starting to show signs of extensive cracking. The cracks that have developed on the prestressed bridge girders have been identified to be mostlyr longitudinal in direction but map {pattern} cracking has also been found at a few locations. The formation of a white coloured deposit has also been observed around most of the cracks. What is the most likely' cause of these cracks? Q a. Sulphate attack of the concrete © b. Alkali-silica reaction of the concrete 0 c. Carbonation-induced corrosion Of the steel reinforcement Q d. Chloride-induced corrosion of the steel reinforcement QUESTION 7 10 points Question 5 in Quiz 4 Which keyI feature will lead to carbonation-induced corrosion of steel reinforcement in a reinforced concrete member? (9 a. A decrease in the pH of the concrete protecting the steel reinforcement O b. The exposure Of steel reinforcement to carbon dioxide &content_id=_2372767_. .. 3/5 22/09/2017 Take Test: Quiz 3 Durability of Concrete (10 Random Questions)... Q c. The presence of cracks in the tensile zone of the reinforced concrete structure will allow oxygen and water to reach the steel reinforcement Q d. The presence of cathodic regions in the steel reinforcement that will corrode QUESTION 8 10 points Question 10 in Quiz 4 Which grouping of concrete making materials is needed as part of the concrete mix design to produce ultra-high strength concrete? 0 a. The use of strong coarse aggregates of 40 mm maximum size 0 b. The use of cement, fly ash and fine sand only, without the inclusion of any fibres O c. The use of cement, fly ash, slag and fine sand only, without the inclusion of any fibres @ d_ The use of cement, silica fume and fine sand with the inclusion of a considerable amount of fibres a Question Completion Status: QUEST'0N9 Question 1 in Quiz 4 Random map [pattern] cracking has been observed at several locations around the top surface of a suspended concrete floor slab the day after casting. What is the most [iIteI'IIr cause of these cracks? Q a. The occurrence of drying shrinkage O b. The occurrence of thermal shrinkage O c. The occurrence of plastic settlement 6) d. The occurrence of plastic shrinkage QUESTION 10 10 points Question 8 in Quiz 4 Which key parameter in concrete mix design calculations is responsible for controlling the strength of a concrete mix? 6) a. The water to binder ratio 0 b. The free water content &content_id=_2372767_. .. 4/5 22/09/2017 Take Test: Quiz 3 Durability of Concrete (10 Random Questions)... O c. The total aggregate content 0 d. The fine aggregate to coarse aggregate ratio Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Answers Save and Submit https:llonline.uts.edu.aulwebappslassessmentltake/launch.jsp?course_assessment_id=_49681_1&course_id=_31731_1 &content_id=_2372767_. .. 5/5 ...
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