SSPC Concrete Coating Basics Questions and Answers 100% Solved correctly

What is the purpose of surface prepartion of concrete for coatings and surfacings? - Answer-Good coating adhesion What is the preferred method of repairing unsound concrete that contains no rebar? - Answer-Remove and replace the unsound area with cementitious material What information is available in ICRI 310.2 for properly preparing concrete surfaces for coatings or surfacings? - Answer-Standards for different concrete profiles What surface preparation method will provide the lowest concrete surface profile? - Answer-Acid etching method What contaminant is most likely to be detected on a concrete surface by the black light test? - AnswerGrease or oil Why is the condensation assessment of a concrete slab important? - Answer-To know how to prepare a concrete slab for a coating or surfacing Used to determine general strength and hardness of concrete? - Answer-Rebound Hammer Used to detect Hydrocarbon Contamination? - Answer-Black Light Used to detect general contamination? - Answer-Water Break Test Quantitative test - used to determine concrete tensile strength? - Answer-ASTM D7234 Dolly Pull-Off Test Quantitative test - used to determine compressive strength? - Answer-ASTM C39 - Concrete Cylinder Test Used to detect moisture in concrete prior to coating? - Answer-Plastic Sheet MethodWhat would the water-to-cement ratio be if you have 300 lbs of water and 550 lbs cement? - Answer- 0.55 An indicator of determining the water-to-cement ratio is? - Answer-Slump test The largest aggregate particle size should not exceed? - Answer-1/3 the depth of the slab, on grade or elevated Which admixture is used in hot weather conditions when there is a need to slow down the set of concrete? - Answer-Retarder What is placed in a concrete mix to minimize its water content? - Answer-Superplasticizer How long do you need to wait for concrete to cure? - Answer-5-7 days How long do you need to wait for concrete to dry? - Answer-28 days Typical PH of new concrete? - Answer-12-14 There might be oils present on surface of concrete if the pH is? - Answer-pH below 8 How do you remove efflorescence? - Answer-Stiff wire bristle brush About how much volume of hardened concrete is occupied by the aggregate? - Answer-60-85% Why is concrete coated? - Answer-It's a very porous substrate What causes popouts on a concrete slab? - Answer-Alkali aggregate reaction (AAR)