Concrete Test 2024-Solved Graded A

Concrete Test 2024-Solved 1. According to ASTM C1602, concrete tested according to ASTM C31 and C39 using a questionable water supply should produce a compressive strength of at least _____% compared to the same mixture made with potable water. - Answer ️️ -x 2. Seawater should not be used in concrete that contains any ____________. - Answer ️️ -x 3. Reinforcing bars are marked with a bar size, which is approximately the nominal diameter in _________ of an inch, or as a directly converted soft metric size. - Answer ️️ -... 4. A cubic yard of concrete with an air content of 5% contains what volume of air in cubic feet? ___________ - Answer ️️ -... 5. To minimize the chance of mid-panel cracking, panels formed by contraction joints should have an aspect ratio (length to width ratio) of no more than _________. - Answer ️️ -... 6. When water is added at the jobsite to a concrete batch, the concrete must be remixed for a minimum of _____ revolutions or until the uniformity of the concrete is within the limits described in ASTM C94. - Answer ️️ -... 7. Of all the synthetic fibers on the market, ______________ has been used most prominently to control plastic shrinkage cracking. - Answer ️️ -... 8. Of all the different supplementary cementitious materials, __________ has the most beneficial effect on water demand. - Answer ️️ -... 9. What type of joints are formed by placing a thin layer of preformed material between abutting faces of a concrete slab and fixed parts of a structure? ___________ - Answer ️️ -... 10. Concrete should generally be cured a minimum of _____ days. - Answer ️️ -... 11. Algae can cause excessive strength reduction either by influencing cement hydration or by causing: a. Alkali-Aggregate Reaction b. Frustrum of a cone c. Excessive hydration d. An increase in air content and setting times - Answer ️️ -... 12. By weight, calcium silicate compounds, C2S and C3S, constitute approximately what percentage of cement? a. 25 b. 50 c. 75 d. 90 - Answer ️️ -... 12. By weight, calcium silicate compounds, C2S and C3S, constitute approximately what percentage of cement? a. 25 b. 50 c. 75 d. 90 - Answer ️️ -... 14. In the United States, what is the percentage of bridges constructed of concrete? a. 25% b. 40% c. 55% d. 70% - Answer ️️ -... 15. The time period in which a specified strength for a high-early-strength concrete should be achieved may range from _____ to several days. a. A few hours b. Four weeks c. One day d. Less than a minute - Answer ️️ -... 16. Which finishing step densifies and compacts concrete next to the form, making it more durable and less vulnerable to scaling, chipping, and popouts? a. Floating b. Troweling c. Darby d. Edging - Answer ️️ -... . The average specific gravity of Portland cement is around _____. a. 2.9