LS_ETC 1251C Week 4 Guided Questions Wk of Jan 29 2024

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Valencia College *

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1251C

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Mechanical Engineering

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Feb 20, 2024

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ETC 1251C (CRN 25557+25555) for Week of January 29, 2024 Week 4 Reading Guide Instructions  The purpose of these guided questions is to reinforce the reading content  Below is a list of questions for you to review and respond.  Please download this Word file, save this file with your name, course CRN, and the reading guide Week (for example, Forbes27773Wk1.doc)  As you respond to the questions, confirm the questions are in BLACK , and your response/answer in GREEN .  My review comments, if shared, will be in RED .  Keep in mind that all writing must be submitted in a professional manner and, unless specifically asked, write in your own words (do not copy/paste excerpts from the text).  Take care to write in complete sentences and use proper grammar, and spell check.  Some assignment deliverable comments: o Your guided question responses will be graded o Your guided question responses are to be turned in via Canvas as an upload of your file in an editable *.doc format. o No handwritten homework will be accepted. o Please include your name and CRN at the top of the page in the spaces provided Page 1 of 4

ETC 1251C (CRN 25557+25555) for Week of January 29, 2024 Chapter 4 – Masonry STUDENT – Landis Surber ETC1251C, CRN - 25555 1) What is one of the oldest manufactured building material and what masonry “family” is it in? (Pg 152) The brick is the oldest building material in the clay missionary family. 2) Why is brick one of the more sustainable building materials? (Pg 152) The materials used to make bricks are some of the most plentiful on earth. 3) At the turn of the twentieth century, what replaced what in primary load carrying elements in larger buildings? (Pg 153) The use of reinforced concrete replaced masonry and stone arches. 4) Using the text, grout and mortar appear to be somewhat interchanged. However, mortar is mostly referenced for what application? And grout is mostly for what application? (Pg 154) (One is mostly for filling voids between masonry units, the other is filling joints for tile setting in paving/flooring). Grout is poured into the spaces between masonry unit wythes and mortar is placed in between masonry units. 5) The mortar’s bond strength is more a mechanical function. How does that function occur with masonry units? (Pg 155) The use of surface texture. 6) Crystllized salts can be harmful/damaging to mortar under what condition – and what is that condition called? (Pg 155) The condition is called subflorescence. 7) What is the currently recognized standard for mortar for unit masonry work and stone? (Pg 157) ASTM C270 8) With all the mortar types, uses, and proportions, what is the basic rule to follow for mortar type? (Pg 158-159) Never select one that is stronger in compression that it needs to be to meet the structural requirements of the wall. 9) Placement of grout should be no longer than how many hours after water has been added? (Pg 160) Grout should be no longer than 1 ½ hours. 10) Placement of mortar should be no longer than how many hours after water has been added? (Pg 161) Mortar should be no longer than 2 ½ hours. 11) What is retempering? (Pg 161) Retempering is the practice of adding water to mortar to restore workability. This keeps the mortar in good condition to be able to lay blocks, bricks or stone. Page 2 of 4

ETC 1251C (CRN 25557+25555) for Week of January 29, 2024 12) Clay masonry units include what examples? (Pg 164) Bricks, hallow clay tile and architectural terracotta. 13) What is the general manufacturing process of clay masonry units? (Pg 164-167) 1. Mining and storing raw materials 2. Preparing the raw materials 3. Forming the brick 4. Drying 5. Firing and Cooling 6. De-hacking and storing finished products. 14) A brick is not necessarily a solid object (for wall construction). The text references three types – what are they? And why are they done? (Pg 171) Frogs, cores, and cells. Thes are done to allow for the mortar to form a more solid bond with the bricks. 15) Brick sizes have a nominal and specified dimension. Why are they different and what is the predominant reason? (HINT, study the Vertical Coursing in Figures 4.4-10 and 4.4-11). This allows them to be easily mass produced and for different uses. 16) What society developed standards for the many types of bricks and clay tile? Related, is it recommended that this society reference is included in the Project Manual’s technical specifications? (Pg 173) The ASTM. 17) Concrete masonry units include what examples? (Pg 179) Concrete masonry units include concrete brick, hollow concrete block, slump block, split-face block, and other special units. 18) What is the general manufacturing process of concrete masonry units? (Pg 179) 1. Material is placed into molds. 2. Then vibrated and compacted. 3. Then quickly demolded. 19) The physical properties of a concrete masonry unit is compared how with “standard” concrete (compared to cement factor, water-cement ratio, aggregate, and curing)? (Pg 182-183) It has a lower amount of sustainability. 20) Masonry walls can be classified into what types? (Pg 189) They can be classified into solid walls, cavity walls, veneered walls, and reinforced walls. 21) What are two advantages with cavity walls in severe exposure? (Pg 191) Continuous air space and permits insulation. 22) In masonry units, what are some (not all) of the commonly used brick pattern bonds? (Pg 195) Running Bond, stacked bond, English bond, etc.. 23) What is the more dominant affect with clay masonry unit walls requiring expansion joints? (Pg 197) The more dominant effect is shrinkage. Page 3 of 4

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ETC 1251C (CRN 25557+25555) for Week of January 29, 2024 24) What is the more common affect with concrete masonry unit walls requiring control joints? (Pg 197) A more common effect is cracking. 25) What are used in masonry unit wall systems over openings? (Pg 203) Dead weight is used in masonry unit wall systems over openings. 26) What is the difference between a pier and a pilaster? (Pg 204) Piers are freestanding while pilasters are combined. 27) In laying masonry units, what are the two terms that define the vertical and horizontal placements of the masonry units? (Pg 211) Plumb and true define the vertical and horizontal placements of the masonry units. 28) What are the three referenced joint finishing types? (Pg 220) Troweled joints, tooled joints, and sealant-filled joints. 29) What is the purpose of flashing in masonry unit wall systems? And what is installed to drain from the flashing to the outside (Pg 221) To intercept and drain moisture out of masonry wall systems. 30) For wall systems that may encounter subsurface water conditions, what technique/application is used for water conditions NOT anticipating water/hydrostatic pressure? And what technique/application is used for water conditions anticipating water/hydrostatic pressure? (Pg 223-224) The technique is called damp proofing. 31) What is pointing? (Pg 225) Pointing is the finishing of mortar joints in masonry. 32) What part of the Stone section in the text interested you the most? (starting on Pg 227) For me it would have to be limestone is because of the amount of time it has been used in construction. 33) What part of the Glass unit masonry section in the text interested you the most? (starting on Pg 235) It would have to be the glass block section because they are used in unique ways. 34) Which 4 inch wall system has the lowest fire rating? (Figure 4.10-1) Glazed Tile 35) Which 8 inch wall system has the highest fire rating? (Figure 4.10-3) Face Brick 36) Which wall system has the highest Sound Transmission Class? (Figures 4.10) Light Weight Concrete Blocks Page 4 of 4