Refer to the learning objectives above. Complete the questions below. Go to the self report form on page 225. Follow the reporting instructions, answer the test questions and submit the form. Or use the Continuing Education self report form on Record's website—archrecord.construction.com—to receive one AIA/CES Learning Unit including one hour of health, safety, welfare credit. QUESTIONS
1. Porosity is a measure of:
a. Density b. Voids as a percentage of volume c. Liquid flow rate d. Relative compressive strength e. Unit weight
2. Concrete is permeable and porous due to:
a. Poor workmanship b. Insufficient curing time c. Incorrect concrete mix d. Voi ds created by water in the mix and cracking due to shrinkage e. Flaws in the formwork
3. Concrete surface coatings and membranes susceptible to all of the following except which?
a. Puncture b. Deterioration and wear c. Blistering d. Delamination e. Poor adhesion
4. D'Arcy's Coefficient is an indicator of:
a. Permeability b. Porosity c. Density d. Design strength e. Deflection
5. Crystalline technology offers protection against all of the following except which?
a. Carbonation b. AAR
c. Chloride ion diffusion d. Oxidation due to water penetration e. Heat migration promoting cracking
6. Crystalline technology works by which mechanism?
a. Plugs holes and voids with a solid cement material b. Reacts with concrete to fill voids and cracks with crystalline growth c. Shifts aggregate material into the voids d. Fill voids with a plastic water resistant material generated by chemical reaction e. Seals openings and channels within 2" of the surface
7. Carbonation is the process where:
a. Air bubbles form within the concrete b. Carbon migrates from reinforcing steel to the surface staining the concrete c. Exterior gasses create a corrosive phenomenon, which soften the surface layers of the concrete d. Steel reinforcement oxidizes.
e. Water is trapped within the concrete
8. Crystalline waterproofing surface application can penetrate up to:
a. 12 inches b. 10 inches c. 8 inches d. 4 inches e. 2 inches
9. For surface crystalline waterproofing applications under normal conditions, the treated surface should be:
a. Sprayed six times a day b. Sprayed three times a day for two to three days to prevent premature drying c. Maintained in a saturated condition for two days d. Saturated for one day, sprayed three times daily for the next day e. Saturated for only one day only
10. The major threat created by the diffusion of chlorides is:
a. Surface delamination b. Reduction of the bond between cement and aggregates c. Increase in the volume of voids in the concrete d. Softening of the concrete e. Oxidation and expansion of steel reinforcement
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The Pros and Cons of
Restoring and Replacing Wood Windows
Sustainability, historical accuracy and economics all enter into decisions about restoration or replacement
Provided by Artistic Doors and Windows, Inc. By Karin Tetlow
Half a century ago, most architects were occupied with designing new buildings. Rarely did they debate the pros and cons of keeping any part of an existing structure, let alone the structure itself—unless the building had an established historical provenance. New construction cost less and was better, while restoring a building was often considered to be prohibitively expensive, and not worthwhile.
Times have changed. Today, more than 90 percent of construction already involves existing structures, many of which are historic, notes Kirk Cordell, executive director of the National Center for Preservation Technology and Training of the National Park Service. Restoring a city row house is now de rigueur, reinventing historic office buildings as condominiums is happening across the country, while industrial buildings and former churches are being adapted as offices, schools and housing.
Clearly, practitioners increasingly require the skills for restoration, adaptive reuse. Architectural graduates must also be prepared. "It's part of the basic toolkit they need to come in with as much as they need to learn CAD," says T. "Gunny" Harboe, AIA, vice president of the preservation group at Austin AECOM in Chicago.
Since windows are arguably the most dominant visual element of a building, decisions
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