Daily Quiz (57)


What term is used to denote “interconnected microcracks in concrete substrates caused by the use of high-impact, mechanical methods of concrete removal and surface preparation"?


Early test findings from a research study have demonstrated improved mechanical properties of concrete after nano platelets of what vegetables have been added.


True or false: ICRI recommends 6 to 9 mils of profile in its surface preparation requirements for polymer overlays on concrete.


What is the name of the reaction in concrete that produces a gel with negative consequences?


True or false: ACI has a specification for pigments used to create integrally colored concrete.


True or false: One mil of surface profile is required on concrete to be treated with a siloxane sealer.


True or false: A portable centrifugal wheel blast machine typically uses steel grit abrasive to clean and profile concrete floors.


True or false: Fred Goodwin says that “crazing” is the term used to describe the creation of microcracks in a concrete substrate after surface preparation by impact, pulverizing or other mechanical surface preparation methods.


What organization recently published a standard on the texture of coatings applied to concrete substrates?


True or false: A PaintSquare blogger recently stated that “Concrete, on average, takes one month per inch of thickness to dry enough to receive most flooring products.”


True or false: Citric acid is not strong enough to etch concrete before painting.


True or false: The anhydrous calcium chloride test for measuring moisture in concrete slabs is a quantitative rather than a qualitative test.


True or false: There is no quantitative test method for measuring the surface profile of concrete.


What is the typical reason for using citric rather than another acid to etch concrete?


True or false: Epoxies to be used over green concrete should be formulated for impermeability.


According to Fred Goodwin in a JPCL article, the three Ds negatively affecting the durability of concrete are deterioration, damage and what else?


True or false: High alkalinity on the surfaces of concrete and galvanizing can cause saponification of some coating types.


True or false: ICRI has published changes to the Concrete Aggregate Exposure Chart, eliminating the medium aggregate surface exposure and the approximate surface cut depths for all classes.


True or false: When a concrete floor slab is scarified in preparation for coating, bruising of the surface is not likely.


What can make concrete difficult to protect with coatings?


True or false: Replica putty can can be used to create a quantitative method for measuring the surface profile on concrete.


True or false: Because dyes do not react chemically with concrete, they are true to their color charts.


True or false: Spidering is the name given to the creation of microcracks in a concrete surface through use of impact, pulverizing or other mechanical surface preparation methods.


Who is the organizer of the Concrete Décor Show, expected to attract 3,000 participants at Palm Harbor, Florida, on Nov. 6-10?


According to an industry glossary, a microtopping over concrete is generally how thick?


True or false: Photographic standards from the International Concrete Repair Institute (ICRI) can be used to judge the degree of surface profile on concrete.


True or false: Polyester resins are sometimes used as binders for mortars and concretes.


When specifying epoxies for green concrete, what attributes are important?


Which of the following organizations has standards for selecting and using concrete repair materials?


True or false: Use of replica putty, as described in an ASTM standard, provides only a visual assessment of surface profile on concrete.


True or false: Acrylic resins are sometimes used to make polymer mortars and concretes.


One coating failure type manifests itself by stickiness and discoloration of the paint and in severe cases by complete liquefaction. What is the failure?


True or false: The gel produced by alkali-silica reaction in concrete has a benign effect on the performance of the concrete.


True or false: According to a D+D article, “Polished concrete is gaining in popularity not only for its aesthetic potential, but also for its tolerance to moisture from within the concrete.”


SSPC is seeking nominations for a Board position in the category, “other product suppliers.” How is this supplier category defined?


ISO/TC 35/SC 14 is in charge of a standard on what topic?


True or false: SSPC-SP 13 describes the commercial power tool cleaning of steel.


True or false: Microcracking of concrete due to mechanical surface preparation methods is sometimes called spidering.


For successful application to green concrete, epoxies must be vapor-permeable and must have what other characteristic?


True or false: The calcium chloride moisture test for concrete, ASTM F1869, measures the amount of moisture emission in only about the top inch of a slab’s depth.


True or false: SSPC has several standards for surface preparation of concrete.


What organization recently published Placing and Finishing Decorative Concrete Flatwork?


True or false: Shotcreting produces a surface profile too rough for thin coatings.


What is the term for the destructive reaction that occurs in concrete between cement paste and amorphous silica found in certain aggregates in the presence of moisture?


True or false: Laitance, sealers and other surface contaminants do not have to be removed prior to performing a moisture test on a concrete floor slab, according to a recent JPCL article.


What organization produces rubber replica templates to judge the degree of surface profile on concrete?


True or false: According to a recent JPCL article, the threshold values in ASTM standards for deeming concrete suitable to be coated are neither achievable nor realistic for below-grade structures.


What organization is developing the “Guide for Fluid Applied Air Barrier Coatings for Concrete Masonry Units”?


What organization produces standards for the surface preparation of concrete?


True or false: The plastic sheet method of detecting moisture in concrete substrates can be used only on floors or other horizontal surfaces.


ASTM standards describe how many methods of measuring moisture in concrete?


True or false: Aggressive application of dehumidification to dry a concrete floor slab should begin within the first 10 days after placement.


True or false: A clear polyurethane used to seal a coated concrete surface should exhibit maximum turbidity.


True or false: Bugholes can be caused by oil and grease on the surface being coated.


Meters for determining moisture content of concrete slabs are based on what principle of operation?


True or false: Crystalline waterproofing materials can be used only after concrete cures.


True or false: Rubber replica templates from the American Concrete Institute can be used to judge the degree of surface profile on concrete.


 
 
   

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