Daily Quiz (15)


What happens to the existing profile on steel when UHP water blasting is used to remove rust and/or coatings?


True or false: Wet abrasive blasting is best for total removal of coatings from brick without substrate damage and minimization of airborne dust, according to a D+D Online article.


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


True or false: According to an industry expert, waterjet cleaning at 20,000 psi can remove thick elastomeric coatings at a production rate up to six times faster than traditional abrasive blasting.


True or false: It is harder to remove coal tar epoxy than coal tar enamel from a steel substrate.


Among the surface preparation methods below, which makes the most sense for removing coatings from brick while minimizing substrate damage and airborne dust?


What method was used to remove more recent coatings and reveal the original finish in the living room of a major historic residence in New England?


True or false: EPA has recently proposed to prohibit the manufacture (including import), processing and distribution in commerce of the paint strippers methylene chloride and N-methylpyrrolidone.


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.


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.


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?


What is the typical pressure range for water jetting when it is used to remove coatings and corrosion from structural steel?


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


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?


True or false: In preservation work on historic structures, abrasive blasting is normally recommended by conservators for coating removal from brick substrates.


 
 
   

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