VOL 3, Unit 2 Masonry Construction questions and answers(verified for accuracy)

408. Determining mortar mix and mixing procedures: 1. Which type of mortar is the most appropriate for residential work? Type N 408. Determining mortar mix and mixing procedures: 2. What does a mix ratio of 1:1:6 indicate? One part Portland cement, one part hydrated lime, and six parts masonry sand 408. Determining mortar mix and mixing procedures: 3. What is the suggested way to mix mortar in some machines? (1) Load ¾ amount of water. (2) Load ½ of the sand. (3) Add all masonry cement or Portland cement and lime. (4) Add the balance of sand and water. (5) Mix three (minimum) to five (maximum) minutes until the mortar is completely mixed and a uniform mixture is obtained. 408. Determining mortar mix and mixing procedures: 4. When hand-mixing mortar, in what sequence should the dry materials be added together? Add half the sand, followed by all of the cement and lime (if used), and then the remaining amount of sand 408. Determining mortar mix and mixing procedures: 5. Within what timeframe should you use or discard mortar after the original mixing? 2 ½ hours 408. Determining mortar mix and mixing procedures: 6. Estimate how much Portland cement, hydrated lime and sand are needed for one cubic yard of mortar when using a 1:1.25:5 mix ratio. 5¼ cubic feet of Portland cement, 6½ cubic feet of lime, and 26¼ cubic feet of sand 408. Determining mortar mix and mixing procedures: Which type of mortar should you choose for general use work, specifically for below-grade masonry that contacts the earth, such as foundations? Type M 3 MULTIPLE CHOICE OPTIONS 408. Determining mortar mix and mixing procedures: What is the minimum/maximum time you should mix the mortar when machine mixing? 3 to 5 minutes 3 MULTIPLE CHOICE OPTIONS 408. Determining mortar mix and mixing procedures: When hand-mixing mortar, which method allows the blending process to take place easier and quicker? Add half the sand, followed by all of the cement and lime, and then the remaining amount of sand. 3 MULTIPLE CHOICE OPTIONS 408. Determining mortar mix and mixing procedures: As a practical guide, you should discard any mortar not used within how many hours? 2½ 3 MULTIPLE CHOICE OPTIONS 408. Determining mortar mix and mixing procedures: Using Rule 38, estimate approximately how much cement and sand is needed for a 1:4 mix ratio. 7.6 cubic feet of cement; 30.4 cubic feet of sand 3 MULTIPLE CHOICE OPTIONS 409. Concrete masonry unit construction: 1. What is the concept behind modular planning? Making maximum use of full- and half-length concrete masonry units to minimize cutting and fitting 409. Concrete masonry unit construction: 2. After you locate the corners, what should you do if the slab is badly out of level? Complete the entire first course before you begin working on the other courses 409. Concrete masonry unit construction: 3. Which part of the block is at the top when laid and why? The thicker side (web) is at the top to provide a larger mortar-bedding area 409. Concrete masonry unit construction: 4. How many courses high are corner leads usually built? Five or six courses high 409. Concrete masonry unit construction: 5. In what sequence are the mortar joints tooled? Tool horizontal joints with a long jointer first, then tool the vertical joints using an S-shaped jointer next 409. Concrete masonry unit construction: 6. Describe the requirements when using anchor bolts. Place pieces of metal lath in the second horizontal mortar joint from the top of the wall under the cores that will contain the bolts. Place ½ × 18-inch long anchor bolts spaced no more than four feet apart into the cores of the top two courses and fill the cores with concrete or mortar 409. Concrete masonry unit construction: 7. Control joints divide a wall into sections that are usually no more than what length? 20 feet long 409. Concrete masonry unit construction: 8. When installing a bond beam on top of a wall, you should lap all rebar splices at least what dimension? 40 times the bar diameter 409. Concrete masonry unit construction: 9. What is a good rule of thumb for how much bearing should be provided for lintels placed above an opening? Allow one inch of bearing for every foot of clear space (minimum of six inches) 409. Concrete masonry unit construction: 10. Describe the requirements for vertical rebar installed in a block wall. Place rebar at each corner and at both sides of each opening. Space a maximum of 32 inches on center and lap the bars 40 times the bar diameter 409. Concrete masonry unit construction: When constructing a concrete masonry wall, which action should you take after you locate the corners? Check the footing or slab for level 3 MULTIPLE CHOICE OPTIONS 409. Concrete masonry unit construction: How do you chase the bond for a concrete masonry wall? Place the first course of blocks without mortar 3 MULTIPLE CHOICE OPTIONS 409. Concrete masonry unit construction: How high should you build the corner leads once the first course is laid? Five or six courses 3 MULTIPLE CHOICE OPTIONS 409. Concrete masonry unit construction: How should you tool mortar joints on a concrete masonry wall? Tool horizontal joints with a long jointer first, then the vertical joints with an S-shaped jointer 3 MULTIPLE CHOICE OPTIONS 409. Concrete masonry unit construction: Which of the following procedures is used to make a Michigan control joint in a concrete masonry wall? Curl a strip of felt into the end core to cover the end of the block on one side of the joint 3 MULTIPLE CHOICE OPTIONS 409. Concrete masonry unit construction: When installing lintels, what is the minimum amount of bearing that you should provide at each end? 6 inches 3 MULTIPLE CHOICE OPTIONS 410. Clay masonry construction: 1. If you must lay bricks in cold weather, what must you ensure? That they do not get wet 410. Clay masonry construction: 2. What are three ways that you can achieve a structural bond with brick? (1) Overlapping (interlocking) the masonry units. (2) Embedding metal ties in connecting joints. (3) Using grout to adhere adjacent Wythes of masonry. 410. Clay masonry construction: 3. If you must use a special-sized brickbat as a spacer to make a course end properly, where should you place the bat? One or more bricks from the end 410. Clay masonry construction: 4. At what slope (incline) are brick laid as sills? ¼ inch per 6 inches of run 410. Clay masonry construction: 5. At what intervals should weep holes be installed? 18 to 24 inches 410. Clay masonry construction: 6. How many courses high should you build the leads before filling in between them? Six or seven courses high 410. Clay masonry construction: 7. What mortar joint thicknesses are the strongest and most water-resistant? ¼- and ⅜-inch 410. Clay masonry construction: 8. Describe how a line is installed for laying stretcher courses. Stretch a tightly drawn line and secure it with pins, corner blocks, and so forth. Fasten the line so that it's about 1/32 inch outside the brick's top edge and level with it 410. Clay masonry construction: 9. When constructing brick arches, what is the minimum thickness mortar joint allowed? No less than ¼ inch at any point 410. Clay masonry construction: 10. What material is used to make a template for arches spanning up to six feet? ¾-inch plywood 410. Clay masonry construction: Which action can you take to ensure that all the face bricks received at the job site are uniform in quality, size and color? Keep a sample from the first load 3 MULTIPLE CHOICE OPTIONS