Engineering > SOLUTIONS MANUAL > CVEN 9824 QUIZ #2__SOLUTIONS ADVANCED MATERIALS TECHNOLOGY Quiz #2 (From Water and Aggregates to Shr (All)

CVEN 9824 QUIZ #2__SOLUTIONS ADVANCED MATERIALS TECHNOLOGY Quiz #2 (From Water and Aggregates to Shrinkage)

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Question 1 (30 Marks) Answer the following true-false questions. Correct response = 3 Marks / No response = 0 Marks / Wrong Response = 0 Marks. True False 1 When using the same content of water, a... n angular and rough textured aggregate generally less workable than a rounded and smooth one. X 2 Aggregate moisture condition is not a critical factor when batching concrete because the amount of absorption is negligible compared to the water content in mix design. X 3 We can generally use water reducing admixture to improve both workability and strength at the same time. X 4 Air entraining agent can not only increase the air content but also workability. X 5 Water content is the most important factor to control the workability. X 6 Plastic settlement cracking occurs due to the fast evaporation of water on the surface. X 7 Chemical shrinkage includes the autogenous shrinkage. X 8 Immersing a hardened concrete in water should be avoided because it changes water-to-cement ratio. X 9 Both plastic shrinkage and drying shrinkage is due to the physical loss of water in concrete. X 10 Water in small pores can be removed easier than water in the large pores due to the less capillary pressure. XNAME: STUDENT ID: 3 Question 2 (10 pts) The concrete producer has an order of 2 tonne of concrete with w/c of 0.40. In this specific mix design of concrete, it was supposed to use the 40% of SSD condition of coarse aggregate and 35% of SSD condition of fine aggregate by total weight of concrete. In the stockpile, the Surface Moisture was 1.2 % for coarse aggregate. However, the fine aggregate was partially dried so it showed 1.6 % of Effective Absorption. It is assumed that there is no admixture in the concrete. Following formulas might be required. ?????????????????? = ???????? − ?????? ?????? × 100 % ?????????????????? ???????????????????? = ???????? − ?????? ???????? × 100 % ?????????????? ?????????? = ???????? − ???????? ???????? × 100 % a) Find the weights of fine aggregate and coarse aggregate. (2 Marks) b) What is the amount of the surface water for the coarse aggregate? (3 Marks) c) What is the amount of water require to bring the fine aggregate from air-dry condition to saturated surface-dried condition (SSD)? (3 Marks) d) How much water should be added or subtracted from the original mix water? Also compute the adjusted amount of mix water. (2 Marks) [Show More]

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