Contractor's Guide to Quality Concrete PDF

Contractor\'s Guide to Quality Concrete ======================================== 1. The most common spread footing consist of a rectangular or square slab of constant thickness. Reinforcing bars are placed near the bottom of the footing and run [ ] ? 2. According to the American Concret...

Contractor\'s Guide to Quality Concrete ======================================== 1. The most common spread footing consist of a rectangular or square slab of constant thickness. Reinforcing bars are placed near the bottom of the footing and run [ ] ? 2. According to the American Concrete Institute, the design load for an elevated slab formwork is the dead load of the slab plus a construction live load allowance of how many pounds per square foot (lbs /ft2)? 3. Control test for slump, air content, compressive strength and yield should conform to? 4. Too much air in concrete does what to the concrete? 5. What design procedure allows for the anticipated downward deflection of formwork when the concrete fills the form? 6. What is the best type of nail to use for nailing bracing and forms when the nails must be removed when the pour is completed? 7. What is the best way to reduce lateral pressure on concrete forms when placing concrete? 8. What should be added to concrete in cold weather? Answer: Calcium chloride 9. What will be the effect of lightly dampening the subgrade before placing the concrete? 10. When working with hot concrete what admixture is used to cool concrete that contains too much water? Answer: Fly ash 11. Which admixture BEST allows for properly finishing a fresh load of concrete that has a high temperature? 12. Which of the following is not a reason to use an admixture? 13. According to the American Concrete Institute, what is the effect of temperature on the finishing time of concrete? 14. Laminated fiber form use for columns should be braced if over? 15. High-range water-reducing admixtures are also known as? 16. What temp does cold-weather concreting need to be performed when the mean daily temperature is below or expected to fall below? 17. What type of forms provide good reuse of equipment, larger concrete placements, and decreased erection time? 18. What would be the depth of the control joint for a slab that is five inches thick?