Concrete Test 2024-Solved

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?