10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The CSRT exam has 65 questions and runs 3 hours.
These 10 free CSRT questions are organized by exam domain, so you can see how each part of the Certified Concrete Surface Repair Technician blueprint is tested. Reveal the answer and explanation under each question.
Rust-stained cracks run along the reinforcing bars of a parking deck exposed to deicing salts. At the affected locations, concrete cover is 35 mm, while the confirmed carbonation front is only 6 mm deep; concrete at the steel remains strongly alkaline. Which mechanism best fits the combined findings?
Correct answer: B - Chloride-induced loss of steel passivity in otherwise alkaline concrete.
Batch records for a repair concrete list 320 kg of portland cement, 80 kg of slag cement, and 148 kg of mixing water at the plant. An authorized 20 kg water addition is made on site. All water contributions and aggregate-moisture corrections are accounted for in these entries. The project limits the water-cementitious materials ratio to 0.45. What should the technician record about the final batch?
Correct answer: D - 0.42; meets the limit, using final water and total cementitious mass.
Heavy chipping leaves a dust-free substrate that matches the specified surface profile. Valid ASTM C1583 tests repeatedly fail at 0.7 MPa within a thin, microcracked layer of retained concrete; the project requires at least 1.5 MPa. The proposed repair mortar satisfies its material requirements. Where should corrective work be directed?
Correct answer: C - To removing the weakened layer and verifying sound substrate beneath it.
During overhead repair inspection above an occupied walkway, a technician sees a freshly separated concrete fragment shift when lightly touched. People are still passing below it. Before continuing the condition assessment, the technician should:
Correct answer: C - Clear and barricade the area below, then arrange controlled assessment and removal.
An approved form-and-pump repair has a low inlet and pressure-rated, sealed forms. The cavity rises to a blind high point beyond the final reinforcing bar, with no outlet at that high point. What change most directly prevents a concealed void?
Correct answer: C - Add a high-point vent so displaced air can escape during filling.
Two repair mortars meet a specified 35 MPa compressive-strength minimum and are suitable for the planned exposure and placement method. Under identical test conditions, mortar X reaches 70 MPa with 0.12% drying shrinkage; mortar Y reaches 45 MPa with 0.03% drying shrinkage. Their other relevant properties are comparable. For a patch restrained by existing concrete, which comparison is technically sound?
Correct answer: A - Y offers lower drying shrinkage while still satisfying the specified compressive-strength requirement.
The pump is ready for a cementitious wall repair whose approved instructions require a saturated-surface-dry substrate. Prewetting is complete, and the concrete is sound, clean, and correctly profiled, but water has pooled along the cavity's bottom edge. Which preparation leaves the substrate ready for placement?
Correct answer: A - Remove the pooled water while keeping the substrate saturated.
While witnessing an ASTM C143 slump test, an inspector notes three layers, each 100 mm deep; 25 rod strokes per layer; a steady vertical mold lift taking 5 seconds; and 2 minutes from the start of filling to mold removal. All other procedural steps are correct. Which observation requires correction and a repeat test?
Correct answer: D - The use of three equal-height layers.
"No initial-curing deviation" is entered for strength-acceptance cylinders from a mixture with a specified compressive strength of 45 MPa. They spent their first 24 hours at 18°C in a protected, moisture-retaining enclosure. The technician used the 16-27°C range to justify the entry. How should the record be reviewed under ASTM C31?
Correct answer: D - Record a curing deviation: this mixture requires the 20-26°C initial-curing range.
An ASTM C1583 pull-off specimen has a measured cross-sectional area of 1,963.5 mm² and fails at a tensile load of 3.60 kN. Fracture is entirely within the original substrate; the disk attachment and repair interface remain intact. For this inspection point, the project accepts cohesive substrate failure at 1.5 MPa or higher. Which entry correctly combines the result with its meaning?
Correct answer: A - 1.83 MPa; the check passes, but ultimate interface bond strength is undetermined.
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