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Daily Quiz (93)


A bush hammer is normally used for what purpose?


True or false: In general, thicker toppings over horizontal concrete require minimal profile.


True or false: ASTM D4541 is a test method describing pull-off adhesion testing of coatings on concrete.


True or false: There is a quantitative test method for measuring surface profile of concrete.


What organization provides education and certification of concrete slab moisture testing technicians?


Most coatings applied to concrete substrates provide what type of protection?


True or false: By matching both the color of the matrix and the aggregates in a concrete substrate, repair materials can be created that will match the appearance of the original substrate.


True or false: The ASTM Plastic Sheet Method (D 4263) for detecting moisture in concrete substrates can be used both on concrete floor slabs and on vertical walls.


True or False: Like their counterparts for steel, there are four SSPC surface preparation standards describing the end condition of concrete after cleaning.


True or False: The plastic sheet method is a quantitative test for determining the extent of moisture in a concrete slab.


What organization created and sells rubber replica templates for determining the surface profile of concrete?


What does the anhydrous calcium chloride test measure?


What is a name sometimes given to the creation of microcracks in a concrete surface through use of impact, pulverizing, or other mechanical surface preparation methods?


Uncured concrete is often associated with what color?


True or False? ASTM D7234, “Standard Test Method for Pull-Off Adhesion Strength of Coatings on Concrete Using Portable Pull-Off Adhesion Testers,” can also be used to measure the surface strength of uncoated concrete.


Which abrasive type is most likely to be used in a portable wheel blast machine for surface preparation of concrete floors?


True or false: Lithium silicate can be used to densify concrete.


True or false: Opaque stains produce color on a concrete floor by reacting chemically with the concrete.


What organization does not produce standards for the surface preparation of concrete?


True or false: The standard for non-destructive measurement of dry coating film thickness on concrete is different from the one used to measure dry coating film thickness on steel.


What is the name of the thin, weak surface layer that can form on newly placed and finished concrete?


What organization has a standard for the surface preparation of concrete?


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


What is the alphanumeric designation of the SSPC Paint Application Standard for measuring the thickness of dry coatings on concrete?


True or false: Some coatings can act as carbonation barriers on concrete.


True or false: A broom finish produces a coarse to very coarse finish on concrete.


What kind of concrete sealers penetrate the pores of the concrete and form little if any film build?


True or false: Acid etching does not produce a surface profile on concrete.


What is bruising of concrete?


True or false: A new concrete surface finished with a power trowel would tend to have high porosity.


Why are zinc-rich coatings sometimes applied to structural concrete?


Which of the following is an environmentally benign material sometimes used to etch concrete before application of coatings?


What characteristic of concrete allows uncoated steel rebar within a slab to be protected from corrosion?


What is the name of the concrete removal technique that employs water?


What organization provides visual profile standards for concrete?


What chemistry type is used to create sealers that penetrate and line the pores of concrete?


What is the conventional wisdom on the length of time concrete should cure before it is coated?


According to SSPC's Surface Preparation Commentary for Steel and Concrete Substrates (SSPC-SP COM), final dry blast cleaning should not be conducted when the steel surface is less than how many Fahrenheit degrees above the dew point?


What is the name of a thin, weak layer of aggregate fines and unreacted constituents at the surface of recently poured concrete?


The rebound hammer, used to test the compressive strength of concrete, also has another name, the last name of the inventor of the device. What is the name?


What organization recently issued a standard for measuring the profile of concrete after surface preparation?


Why must laitance and efflorescence be removed before coating concrete?


What organization has presented Concrete Coatings Conferences at the World of Concrete show?


True or false: There are no quantitative methods for determining levels of moisture in concrete floor slabs.


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


True or false: Film-forming coating systems on exterior masonry or concrete walls should not have any moisture vapor permeability.


True or false: There is no quantifiable method for determining the surface profile on concrete substrates.


While a concrete surface needs to be clean prior to application of a silane or siloxane sealer, it does not require substantial roughening or profiling. Why?


ACI 301 requires how much concrete thickness to be poured over reinforcing steel?


What effect does the high alkalinity of concrete have on corrosion of rebar within the concrete?


True or false: The addition of pigments is required to match the color of concrete repair materials with the color of the concrete matrix being repaired.


True or false: The density of concrete prevents water vapor and gases from moving freely within the matrix.


True or false: One cause of rebar corrosion in concrete is carbonation of the concrete surrounding the rebar.


What organization hosts the annual Concrete Décor Show?


When acid etching is used to create a profile on concrete in preparation for painting, why is it important to rinse the concrete thoroughly after the etching is completed?


True or false: All sealers for concrete substrates form a thin film on the surface of the concrete.


True or false: The most accurate meters for detecting moisture within a concrete substrate are based on readings of temperature and humidity.


Which of the following product types is a water-repellant for masonry and concrete that penetrates pores, is breathable, and does not change the appearance of the substrate to which it is applied?


What is the main reason for backrolling a concrete masonry substrate after the initial paint application by spray?


What is “green” concrete, when the term “green” does not refer to a positive environmental impact?


Why would a test for moisture content of concrete be important prior to application of thick-film elastomeric coatings?


Why is back rolling often required following airless spraying of coatings over concrete blocks (CMUs)?


True or false: ASTM has separate test methods for steel and concrete substrates in determining the pull off adhesion of coatings.


True or false: Water beading on a new concrete floor indicates it is ready for application of a chemically reactive stain.


Corrosion of rebar is likely to cause which of the following conditions in concrete?


True or false: Non-film-forming coatings used as sealers on concrete and masonry cannot be pigmented to alter the appearance properties of substrates.


What is the conventional wisdom about the amount of time required for concrete to cure before it can be coated?


True or false: Novolac epoxies and polymer concretes are sometimes selected as flooring systems over concrete for resistance to chemicals.


Which of the following surface preparation methods for concrete produces the largest surface profile?


ICRI recommends how much surface profile in its surface preparation requirements for polymer overlays on concrete?


True or false: Elastomeric coatings are generally able to bridge minor cracks in concrete.


Which of the following coating types is used as a non-film-forming sealer for concrete substrates?


What organization produces standards for the surface preparation of concrete?


True or false: A coating system on an exterior concrete block wall must provide protection from wind-driven rain and, if moisture vapor diffuses from inside to outside, be sufficiently permeable to allow vapor to exit the wall.


True or false: Silane and siloxane sealers prevent both water ingress into concrete and moisture vapor from escaping the concrete.


True or false: Non-film-forming sealers, such as siloxanes, allow moisture to escape from within concrete substrates.


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


True or false: Siloxane sealers are typically applied at 1-2 mils dry film thickness on concrete substrates.


Hydrophobic contaminants on concrete may include what types of materials?


Which of the following terms is out of place in the list?


What is the usual name given to the type of crack that occurs in fresh concrete soon after it is placed?


True or false: A dry-shake material can be spread over fresh concrete and "floated in" to color the surface.


What is the name of the surface imperfection in a concrete wall that occurs when cement paste finds its way into gaps between forms.


Which of the following is a common contaminant on an exterior concrete wall that should be removed before coating?


What is the main reason why zinc coatings are sometimes applied to structural concrete?


True or false: Concrete should be roughened to produce a profile before application of a silane or siloxane sealer.


A portable centrifugal wheel blast machine uses what kind of abrasive to clean and profile concrete floors?


True or false: Citric acid is sometimes used to etch concrete before a coating is applied.


True or false: Film-forming coating systems on exterior masonry or concrete walls should exhibit water vapor permeability or breathability.


What is the main reason that alkyds generally are not specified for concrete surfaces?


Common surface imperfections, as opposed to contaminants, in newly placed concrete that deserve attention in surface preparation operations include all but which one of the following?


Adding color to concrete can be achieved through use of:


What is the main reason thermal spray zinc is sometimes used on concrete substrates?


 
 
   

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