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Daily Quiz (202)


True or false: Some departments of transportation and other owners continue to list design containment ventilation air flow rates of 60 fpm down-draft and 100 fpm cross-draft in their specifications.


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.


True or false: According to a PaintSquare News account of research on reducing excessive blast profile by re-blasting with a smaller abrasive, there is no adverse effect on peak count and peak density from this corrective action.


True or false: SSPC/NACE standards on surface preparation by waterjetting are now published on five levels of cleanliness.


True or false: “One of the most prominent disadvantages found with dry abrasive blasting is that the blasting process can press contaminants into the surface,” according to PaintSquare blogger Warren Brand.


True or false: A recent JPCL article reported results of a study indicating that inadequate surface preparation accounts for more than 75 percent of coating failures, while other studies indicate that inadequate engineering and specifying account for as much as half of coating failures.


True or false: Corn cobs are sometimes used to create abrasive for blast cleaning.


What type of blasting abrasive consists mainly of aluminum silicate?


What type of surface preparation is most likely to clean a metal surface but leave contaminants in pits?


True or false: SSPC publishes four standards for waterjetting and four standards for wet abrasive blasting.


According to a Durability + Design article on the subject, to totally remove coatings from brick and at the same time to minimize substrate damage and avoid generation of airborne dust, which of the following surface preparation methods makes the most sense?


Concrete can be bruised by what surface preparation method?


True or false: In a sieve analysis of abrasives, the sieve number describes the number of openings in a linear inch of sieve mesh.


In its degree of cleaning, SSPC-SP 14 sits between what other two SSPC blast cleaning standards?


True or false: SSPC has a surface preparation standard for flame cleaning of new steel.


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


In what SSPC standard can you find requirements for frequency and location of instrument readings and evaluation criteria to ensure that the surface profile over the entire prepared surface complies with project requirements are included?


True or false: When UHP is used to describe water jetting for surface preparation, it stands for “Upper High Pressure.”


True or false: The standards for testing coatings adhesion, ASTM D4541 for metal and ASTM D7234 for concrete, are based on imposing a shear stress on the coating.


According to a Durability + Design article, to achieve total coating removal from brick with minimal substrate damage and no airborne dust generation, what removal method makes the most sense?


True or false: Among SSPC power tool cleaning standards, only SSPC-SP 11, Power Tool Cleaning to Bare Metal, requires a surface profile.


True or false: Conformance with specified requirements for cleanliness of steel after surface preparation, as described in SSPC standards, is carried out without the aid of instruments.


What is a typical speed that abrasive reaches after leaving the nozzle in an air abrasive blast-cleaning system?


True or false: Descaling is the removal of mill scale by either mechanical or chemical means.


True or false: SSPC has a standard for hand-tool cleaning of steel before painting that requires a surface profile.


Which one of the following agricultural materials is typically not used to create abrasives for blasting?


True or false: A recently published study in JPCL determined that wet surface preparation methods are less effective and result in higher remaining chloride levels than dry methods when cleaning corroded, chloride-contaminated steel surfaces.


A White Metal Blast, SSPC-SP 5, allows what to remain on the surface after blast cleaning?


True or false: sodium bicarbonate is sometimes used as an abrasive in a blast-cleaning system.


True or false: Hackles are protrusions on a coated surface created by abrasive or other particles not removed before the coating was applied.


True or false: SSPC photos in Vis 1 showing degrees of cleaning of steel take precedence over the descriptions of required cleanliness in SSPC's written surface preparation standards.


True or false: Abrasive blast workers are regularly exposed to noise levels of 90-100 decibels.


True or false: In a laboratory study of zinc-rich primers for marine environments, recently reported in JPCL, coatings applied over surface preparation by UHP waterjetting, even though it produced no roughness, achieved performance equivalent to, or better than, that achieved by abrasive blasting.


Which of the following surface preparation methods produces the lowest surface profile range on concrete, according to ICRI 310.2?


How many of SSPC's surface preparation standards describe the results of power tool cleaning of steel?


True or false: When using steel abrasive for blast cleaning, the initial condition of steel has no effect on the end condition after cleaning.


True or false: In addition to issuance of joint standards on air abrasive blast cleaning, SSPC and NACE issue other kinds of joint surface preparations standards.


True or false: A wet blasting system requires water pressure to provide a cleaning force.


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


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


In abrasive blasting work, how small do dust particles have to be to make them respirable?


What is the acronym for Japanese surface preparation standards?


True or false: Abrasive blast workers are regularly exposed to noise in excess of 120 dBA.


The standard ISO8501, the international standard for dry abrasive blasting, describes results of four degrees of blast cleaning, Sa 1, Sa 2, Sa 21/2 and Sa 3. What does the Sa stand for, according to a PaintSquare blog?


Which of the following ISO 8501-1 standards is equivalent to SSPC-SP 6, Commercial Blast?


SSPC publishes visual standards for what cleaning method?


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


True or false: According to a JPCL article on achieving peak performance from abrasives, the easiest way to adjust profile height in the field is by changing the velocity of the abrasive.


True or false: In an air abrasive blasting operation, if you change from a sand abrasive with a specific gravity of 2 to a garnet abrasive with a specific gravity of 4, you should expect an increase in cleaning rate.


True or false: During abrasive blasting operations inside containment in cold weather, dust collection may pull heat out of the containment structure as fast as it is being put in by heating equipment.


True or false: A Durability + Design article says that wet abrasive blasting is the best method for totally removing coatings from brick while at the same time minimizing substrate damage and airborne dust.


What kind of blasting abrasive is composed of aluminum silicate?


What is the name for an abrasive’s resistance to breakdown on impact?


True or false: The photographic guides developed by SSPC to aid in the assessment of surface cleanliness were designed to be used with a hand-held magnifying glass when examining blast-cleaned steel and comparing it with the VIS-1 photos?


If SSPC-SP 16 is specified to prepare architectural aluminum for recoating, what blast pressure should be used?


True or false: Hand-tool and power-tool surface preparation standards in the U.S. are jointly issued by SSPC and NACE.


True or false: The conformance of blast-cleaned steel with surface preparation specifications, such as SSPC-SP 10, is assessed visually without the aid of instrumentation.


True or false: Abrasive fines are debris found in blasting abrasive.


What is another name for surface profile on steel?


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


In general, when is it better to use impact power tools rather than rotary power tools?


True or false: When mill scale is removed from steel by abrasive blasting, the steel begins to rust.


True or false: SSPC visual standards showing degrees of cleaning of steel take precedence over the descriptions of required cleanliness in SSPC's written surface preparation standards.


True or false: Ultra-high-pressure water jetting at 30,000 psi typically produces a greater volume of water in removing coatings from a masonry substrate than does pressure washing at 5,000 psi.


Which of the following statements about SSPC-SP 11, Power Tool Cleaning to Bare Metal, is correct?


True or false: RH and surface cleanliness are both critical factors in flash rusting.


True or false: ASTM D4417 describes three methods for measuring surface profile of blast-cleaned steel using either a digital profile gage or a surface profile comparator or a portable stylus instrument.


What organization produces standards for the surface preparation of concrete?


True or false: It is possible to write performance-based specifications for surface preparation prior to painting.


True or false: All of the SSPC mechanical surface preparation standards require solvent cleaning to SSPC-SP 1 prior to performing any additional cleaning required by the project specification.


In a centrifugal wheel blast machine, what is another name for “operating mix?"


True or false: A recent Naval Research Laboratory study determined that coating performance is not adversely affected by chloride contamination.


True or false: Air abrasive blast workers are regularly exposed to noise in excess of 120 dBA.


True or false: SSPC-SP 10 is the most rigorous degree of cleaning steel by abrasive blasting.


In surface preparation work, what is a jobsite standard?


True or false: Corn cobs, walnut shells, and olivine are used to make blast abrasives classified as agricultural.


True or false: Sponge jetting requires ultra-high pressure (UHP) water.


What organization offers a standard that gives durability grades of low, medium, and high for paint systems in various environments and levels of surface preparation?


True or false: A White Metal Blast, SSPC-SP 5, allows stains to remain on 5 percent of the surface after blast cleaning.


True or false: ICRI recommends a profile of 10 mils to 1/4 inch in its surface preparation requirements for polymer overlays on concrete.


True or false: In air abrasive blasting operations, the same particle size mix of silica sand and coal slag yield the same profile ranges on steel.


In addition to trisodium phosphate, used for cleaning in painting operations, what other material has the acronym TSP?


True or false: Seismic retrofits of bridge piers can be carried out with Bresle patch fabric.


True or false: Written descriptions of end conditions of steel after blast cleaning take precedence over visual photos in judging conformance with SSPC blast cleaning standards.


True or false: One kind of wet blast system uses air rather than water pressure as the cleaning force.


True or false: SSPC-VIS 1, Visual Standards for Blast Cleaned Steel, was initially produced by the Institute of Corrosion in the U.K.


True or false: SSPC has a standard for brush-off blast cleaning of steel and a second one for concrete.


True or false: In a JPCL article describing a study about surface preparation of repair mortars in wastewater treatment plants, the authors concluded that broom finishing was inferior to abrasive blasting in producing surfaces for the successful application of protective coatings.


True or false: SSPC has surface preparation standards for concrete that are equivalent to its abrasive blasting surface preparation standards for steel–SSPC-SP 5, SP 6, SP 7, and SP 10.


According to a surface preparation study reported recently in JPCL, abrasive size was found to be a primary driver in the resultant surface profile depth and peak density of blasted steel surfaces.


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?


True or false: SSPC surface preparation standard SSPC-SP 10 requires an end condition of blast-cleaned steel that is approximately twice as clean as the end condition of SSPC-SP 5.


What is one drawback of using low pressure water (less than 5,000 psi) at 250 F to remove coatings from brick?


What new technology has been used recently in coating work on the Sydney Harbour Bridge?


What is the process called when steel shot is used to improve the fatigue properties of steel?


A White Metal Blast, SSPC-SP 5, allows what to remain on the surface of steel after blast cleaning?


True or false: All wet blast systems use water pressure as the cleaning force.


For what type of surface preparation of steel does SSPC publish reference photographs?


What is another name for micro-cracking of concrete floor slabs during surface preparation?


What is the ideal pressure at the nozzle of an air abrasive blast system to achieve maximum productivity in the cleaning of steel?


Abrasive blast cleaning to remove lead-based paint is governed by what EPA regulation?


True or false: One kind of wet blasting system uses air pressure rather than water pressure as the cleaning force.


According to a D+D article, to achieve total coating removal from brick with minimal substrate damage and no airborne dust generation, what removal method makes the most sense?


True or false: In North America, SSPC is the sole publisher of hand- and power-tool cleaning standards.


True or false: Abrasive particles in an efficient air abrasive blast system typically travel at a speed of 100 miles per hour.


SP 3 is a shorthand version of SSPC-SP 3, Power Tool Cleaning, but it can also refer to what research program important to the coatings industry?


True or false: According to a recent JPCL article, ISO’s Sa 2 “thorough” blast cleaning standard is equivalent to SSPC-SP 14, NACE No. 8 Industrial Blast Cleaning.


What is the name of the Norwegian standards on coating and surface preparation?


A broom finish on concrete translates to approximately what level of ICRI’s Concrete Surface Preparation (CSP) standards?


True or false: The appearance of steel after blast cleaning is affected by the type of abrasive used, among other factors.


True or false: In air abrasive blast systems, the bull hose carries pressurized air and abrasive to the blast nozzle.


True or false: SSPC has a blast cleaning standard for non-ferrous metals such as architectural aluminum.


What organization has a surface preparation standard for brush-off blast cleaning of non-ferrous metals?


What organization offers a standard that gives durability grades of low, medium, and high for paint systems in various environments and levels of surface preparation?


True or false: A coating system description in a specification may include surface preparation and quality control requirements.


According to a JPCL article in July, how can flash rusting of newly abrasive-blasted steel be prevented or minimized?


What organization publishes the Standard for the Preparation of Steel Substrates for PSPC?


True or false: HVLP stands for high volume low particulate.


True or false: Scabbling produces a rougher profile on concrete than does air-abrasive blasting with sand.


True or false: According to a recent JPCL article, planing is more effective than shotblasting in removing asphalt, latex, adhesives and other materials that are thicker than 2 mm from concrete floors.


True or false: Conformance with specified requirements for cleanliness of steel after surface preparation, as described in SSPC standards, is carried out without the aid of instruments.


True or false: Centrifugal blast cleaning can be both portable and stationary.


How does one surface preparation industry expert, Dr. Lydia Frenzel, differentiate between flash rust and rust back?


What happens to the condition of a steel substrate when waterjet cleaning is used to remove rust or existing coatings?


How many sets of visual reference guides supplementing written surface preparation standards are published by SSPC?


True or false: In a JPCL article describing a study about surface preparation of repair mortars in wastewater treatment plants, the authors concluded that broom finishing was superior to abrasive blasting in producing surfaces for the successful application of protective coatings.


What surface preparation method for concrete produces the largest profile?


Ultra high pressure (UHP) waterjetting, using water alone at pressures of 35,000-40,000 psi, is sometimes used for what purpose in coating work?


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: SSPC-SP 11, Power Tool Cleaning to Bare Metal, has no requirement for surface profile.


True or False: In judging the conformance of abrasive blast cleaning of steel with SSPC standards, such as SSPC-SP 10, the photos in SSPC-VIS 1 depicting levels of cleanliness take precedence over the written descriptions of required levels of cleanliness.


SSPC-VIS 1, now called Guide and Reference Photographs for Steel Surfaces Prepared by Dry Abrasive Blast Cleaning, was originally produced by what other standards organization?


What is the name for an abrasive’s resistance to breakdown on impact?


Centrifugal wheels are used in what kind of equipment?


In general, when is it better to use impact power tools (needle gun, roto peen) rather than rotary tools (wire brush, etc.)?


Respirators must be approved for use by what organization?


In what kind of work do you hear the term, “operating mix?”


What is the source of potential inhalation hazards that blasters face in air abrasive blasting operations?


True or False: A low-pressure, low-impact abrasive blasting process using a blend of walnut shells and staurolite sand has been developed for cleaning architectural sheet metals and other substrates.


True or False: In August this year, OSHA issued a proposed rule banning use of crystalline silica as a blasting abrasive.


True or False: Wire bristle tools were recently classified as impact power tools in SSPC power tool cleaning standards.


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?


Rotating flaps with hard metallic tips are components of what piece of surface preparation equipment?


Why is crystalline silica sand more likely to cause silicosis when it is used for abrasive blasting, as opposed to when it blows around on a beach?


Which of the following ISO 8501-1 standards is equivalent to SSPC-SP 6, Commercial blast?


True or False: Maximum levels of soluble salts that can remain on a steel substrate after surface preparation are mandated in SSPC-Guide 15 and ISO 8502.


Surface roughness and peak count of abrasive-blasted steel are the subject of what SSPC standard?


What description fits Initial Condition D of steel before blasting?


True or False: OSHA has lowered the permissible exposure limits on crystalline silica.


True or false: The number of peaks in a steel surface profile created by abrasive blast cleaning has no effect on coating performance.


True or False? The higher the water pressure of a pressure washer, the more effective will be the rinsing step after coatings are exposed to chemical strippers for the appropriate time on masonry substrates.


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


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


Reference photographs for surface preparation of steel by waterjetting are found in what document?


According to JPCL author David Dorrow, what makes an abrasive “green?”


True or False: Sponge blasting employs particles of sponge as abrasive.


True or false: SSPC visual standards showing degrees of cleaning of steel take precedence over the descriptions of required cleanliness in SSPC’s written surface preparation standards.


True or false: All the SSPC surface preparation standards are issued jointly with NACE.


Determining the particle size distribution of blast abrasive is achieved by what method?


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


True or false: In air abrasive blast cleaning of steel, a venture nozzle generates a deeper blast profile than a straight bore nozzle with the same diameter opening.


True or false: Some experts recommend that a weathered TPO roof be prepared for coating by cleaning with an aqueous cleaner followed by power washing.


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


True or false: Dry ice blasting produces a lesser volume of debris than the amount produced by air abrasive blasting using slag abrasive.


True or false: The USDA Forest Products Laboratory (FPL) recommends special surface preparation prior to painting if bare wood is exposed to the atmosphere for more than three to four weeks.


Which of the following cleaning techniques is most likely to remove soluble salts from a heavily pitted steel surface?


True or false: There is an SSPC power tool cleaning surface preparation standard describing a degree of cleanliness that falls between Power Tool Cleaning, SSPC-SP 3, and Power Tool Cleaning to Bare Metal, SSPC-SP 11.


True or false: SSPC published a surface preparation standard, now discontinued, describing flame cleaning of steel.


True or false: UHP waterjetting at 35,000 to 40,000 psi is typically used for surface preparation of stucco before painting.


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


When water under pressures of 30,000-40,000 psi is used to clean steel before painting, what is this form of cleaning called?


If you’re a contractor concerned with meeting the end condition appearance requirements for steel after blast cleaning, what precaution might you take?


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?


True or False: SSPC’s recent revisions to SSPC-SP 11 and SSPC-SP 15 changed the standards’ requirements for surface cleanliness and minimum surface profile.


What kind of abrasive was used to remove the failing baked-on gold enamel from 30,000 square feet of clay tiles on the New York Life building in preparation for applying gold leaf?


Which of the following is an abrasive media used in a blasting system on delicate substrates?


“Surface Preparation and Cleaning of Metals by Waterjetting Prior to Coating” is a newly revised standard by:


Which of the following statements about SSPC-SP 11, Power Tool Cleaning to Bare Metal, is true?


If a specification requires one of the following–brush-off blasting (SSPC-SP 7), commercial blasting (SSPC-SP 6), or near-white blasting (SSPC-SP 10), what other cleaning standard is invoked?


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


True or False: The Australasian Corrosion Association is licensed to teach SSPC’s C7 Abrasive Blasting course.


True or False: Dehumidification equipment is sometimes used to “hold the blast” after surface preparation of the interior of a storage tank.


What is a typical particle speed for abrasive in an air abrasive blast system that utilizes a venturi nozzle?


True or false: If you are removing a soft, pliable coating from a steel surface, a rounded abrasive will be more productive than an angular one.


What is the name usually given to a robotic surface preparation machine used in the field on ship and tank exteriors?


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?


Why is crystalline silica sand more likely to cause silicosis when used as an air abrasive blasting material than it is in its natural state, for instance, as beach or river sand?


True or false: All the SSPC surface preparation standards are issued jointly with NACE.


Which of the following is most likely to be the result of excessive profile depth on steel after blast cleaning?


True or false: ISO Sa2.5, describing very thorough abrasive blast cleaning, gives a more comprehensive written description of the end condition of the steel after blasting than SSPC SP 10/NACE No. 2, Near white metal, which requires a similar end condition.


Which of the following factors influences the appearance of steel after blast cleaning?


In general, which of the following coating types or conditions is easiest to remove by blast cleaning?


The ISO surface preparation standard Sa 3 most closely resembles what SSPC/NACE surface preparation standard?


Which of the following cleaning techniques is least likely to remove soluble salts from a steel surface?


True or false: In abrasive blasting, the harder the abrasive, the deeper the profile it is likely to generate.


A White Metal Blast, SSPC-SP 5, allows what to remain on the surface after blast cleaning?


To totally remove coatings from brick and at the same time to minimize substrate damage and avoid generation of airborne dust, which of the following surface preparation methods makes the most sense?


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


True or false: The SSPC surface preparation standards were numbered according to the chronological order in which they were adopted, not according to their degree of thoroughness.


True or false: In surface preparation operations, hackles are most likely to be formed on steel substrates when the blast abrasive is steel shot.


Rotating flaps with hard metallic tips is a component of what piece of surface preparation equipment?


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?


 
 
   

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