CONCRETE FIELD TESTING TECHNICIAN PERFORMANCE EXAM

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CONCRETE FIELD TESTING TECHNICIANPERFORMANCE EXAMNameDateLast Four Digits of SSNEmployerFirst TrialSecond TrialWYDOT 478.0ASTM C1064 - Temperature of ConcretePassFailPassFailWYDOT 477.0ASTM C172 - Sampling Freshly Mixed ConcretePassFailPassFailWYDOT 480.0ASTM C143 - Slump of Hydraulic-Cement ConcretePassFailPassFailWYDOT 479.0ASTM C138 - Density (Unit Weight) and YieldPassFailPassFailWYDOT 481.0ASTM C231 - Air Content, Pressure MethodPassFailPassFailWYDOT 485.0ASTM C31 - Making and Curing Test SpecimensPassFailPassFail11/16/20To pass the WMTC Concrete Field Testing Technician Performance Exam, each individual testmethod must be passed on either the first or second trial. If any of the test methods are notpassed by the second trial, the examinee must retake the entire exam at a later date.OVERALL SCOREPASSFAILCommentsExaminer SignatureWMTC Concrete Field Testing Technician Performance ExamDate1 of 14

Test Method WYDOT 478.0 as per ASTM C1064Temperature of Freshly Mixed Hydraulic-Cement ConcreteNameFirst TrialPass FailSecond TrialPass Fail1.Place the temperature measuring device (TMD) inthe concrete so that the sensing portion issubmerged a minimum of 3 inches. (Para. 8.1)2.Gently press concrete around the TMD so thatambient (outside) air temperature does not influencethe measured temperature. (Para. 8.1)Pass FailPassFail3.Leave the TMD in the concrete for at least 2 min. butnot more than 5 min. (Para. 8.2)Pass FailPassFail4.Read and record the fresh concrete temperature tothe nearest 1 F. Do not remove the TMD from theconcrete when reading the temperature. (Para. 8.2)Pass FailPassFail5.Report the measured temperature of the freshlymixed concrete to the nearest 1 F. (Para. 9.1)Pass FailPassFailTo pass this performance exam, each individual step must be passed on either the firstor second trial. If the examinee fails one of the steps, the examinee should finish the trial.OVERALL SCORE (circle one for each trial)PASS FAILPASS FAIL1st SupplementalExaminer SignatureDate2nd SupplementalExaminer SignatureDateExaminee’s Recorded Temperature MeasurementTemperature First TrialTemperature Second TrialWMTC Concrete Field Testing Technician Performance Exam2 of 14

Test Method WYDOT 477.0 as per ASTM C172Sampling of Freshly Mixed Concrete (Verbal Exam)NameThe supplemental examiner asks the numbered questions and the examinee mustverbally provide all information indicated by boldface type. Examinee’s responses neednot to be phrased exactly as shown but must agree with the stated answers.First TrialSecond Trial1.What must occur before a sample of concrete can bePass Failtaken from a revolving drum mixer? (Para. 5.2.3) All water and admixtures must be added to themixerPass Fail2.When sampling from a stationary or revolving drummixer, what is collected and when is it taken duringdischarge? (Para. 5.2.1 and 5.2.3) Two or mare portions of concrete At regularly spaced intervals From the middle of the batchPass FailPass Fail3.How are the sample portions obtained from thedischarge stream of a stationary or revolving drummixer? (Para. 5.2.1 and 5.2.3) Repeatedly pass a receptacle through the entiredischarge stream Completely divert the discharge stream into asample containerPass FailPass Fail4.Describe the procedure for collecting a sample from apaving mixer. (Para. 5.2.2) Discharge the contents of the paving mixer Obtain samples from at least five (5) differentportions of the pilePass FailPass Fail5.What is the minimum size for a sample when strengthtest specimens are to be molded? (Para. 5.1) 1 ft3Pass FailPass Fail6.What is the maximum allowable time between obtainingthe first and final portions of the composite sample?(Para. 4.1) 15 minPass FailPass FailWMTC Concrete Field Testing Technician Performance Exam3 of 14

Test Method WYDOT 477.0 (ASTM C172)Sampling of Freshly Mixed Concrete (Verbal Exam)First TrialSecond Trial7.What action is required after the individual concretesamples have been transported to the place wheretests are to be performed? (Para. 4.1.1) Combine and remix the samples with a shovelPass FailPass Fail8.What should be done if the concrete containsaggregate larger than is appropriate for the size of themolds or equipment being used? (Para. 6.1) Wet sievingPass FailPass Fail9.Start the tests for slump, temperature, and air contentwithin how many minutes after obtaining the finalportion of the composite sample? (Para. 4.1.2) 5 minPass FailPass Fail10. Start molding specimens for strength tests within howmany minutes after fabricating the composite sample?(Para. 4.1.2) 15 minPass FailPass Fail11. From what must the concrete sample be protected?(Para. 4.1.2) Sun, wind, and rapid evaporation ContaminationPass FailPass FailTo pass this performance exam, each individual step must be passed on either the firstor second trial. If the examinee fails one of the steps, examinee should finish the trial.OVERALL SCORE (circle one for each trial)PASS FAILPASS FAIL1st SupplementalExaminer SignatureDate2nd SupplementalExaminer SignatureDateWMTC Concrete Field Testing Technician Performance Exam4 of 14

Test Method WYDOT 480.0 as per ASTM C143Slump of Hydraulic-Cement ConcreteNameFirst TrialPass FailSecond TrialPass Fail1.Dampen the mold. (Para. 7.1)2.Place the mold on a rigid, flat, level, moist, nonabsorbent surface, free of vibration, that is largeenough to contain all of the slumped concrete. (Para.7.1)Pass FailPassFail3.Hold the mold firmly in place during filling and cleaningby standing on the two foot pieces on either side of themold or using a base plate with clamps. (Para. 7.1)Pass FailPassFailPass FailPassFailB) Rod the layer 25 times throughout its depth withrounded end of the tamping rod. Uniformly distributethe strokes over the cross section of the layer. Inclinethe rod slightly, starting near the perimeter, andprogress with vertical strokes spirally toward the center.(Para. 7.2)Pass FailPassFailFor the second layer:A) Fill the mold to approximately 2/3 of its volume. (61/8 in., Para. 7.1 and Note 5)Pass FailPassFailB) Rod the layer 25 times uniformly over the crosssection, with the rounded end of the rod. Rod throughthe layer and into the layer below approximately 1 in.Uniformly distribute the strokes over the cross sectionof the layer. (Para. 7.2)Pass FailPassFailFor the third layer:A) Heap concrete above the top of the mold. (Para. 7.3)Pass FailPassFailSTART TIMING FOR TOTAL TEST ELAPSED TIME4.Using a scoop, fill the mold in three layers, moving thescoop around the perimeter of the mold opening toensure an even distribution of the concrete.For the first layer:A) Fill the mold to approximately 1/3 of its volume (25/8 in., Para. 7.1 and Note 5)5.6.WMTC Concrete Field Testing Technician Performance Exam5 of 14

Test Method WYDOT 480.0 (ASTM C143)Slump of Hydraulic-Cement ConcreteFirst TrialSecond TrialB) Rod layer 25 times uniformly over the section, withthe rounded end of rod. Rod through the layer and intothe layer below approximately 1 in. Uniformly distributethe strokes over the cross section of the layer. (Para.7.2)PassFailPassFailC) Should rodding the layer result in the concretefalling below the top of the mold, add concrete to keepan excess above the mold. Continue the rodding countfrom the value reached before more concrete wasadded to the mold. (Para. 7.3)PassFailPassFail7.Strike off the top surface of concrete with the tampingrod in a screeding and rolling motion. (Para. 7.3)PassFailPassFail8.While maintaining downward pressure, remove anyconcrete which collected around the base of the moldduring strike off. (Para. 7.3)PassFailPassFail9.Immediately remove the mold by raising it in a steady,vertical direction. There should be no lateral ortorsional motion of the mold while lifting. Lift the moldoff the concrete, a distance of 12 in., in 5 2 sec.(Para. 7.3)PassFailPassFail10. Complete the slump test, from the start of filling themold through the removal of the mold, in 2-1/2 min.(Para. 7.3)PassFailPassFail11. If a decided falling away or shearing off of concretefrom one side or portion of the mass occurs, disregardthe test and make a new test on another portion of thesample. (Para. 7.4)PassFailPassFail12. Immediately measure the slump. This is the verticaldistance between the top of the mold and thedisplaced original center of the top surface of thespecimen. (Para. 7.4)PassFailPassFail13. Report the slump to the nearest 1/4 in., (Para. 8.1)PassFailPassFailSTOP TIMING FOR TOTAL TEST ELAPSED TIMEWMTC Concrete Field Testing Technician Performance Exam6 of 14

Test Method WYDOT 480.0 (ASTM C143)Slump of Hydraulic-Cement ConcreteTo pass this performance exam, each individual step must be passed on either the firstor second trial. If the examinee fails one of the steps, examinee should finish the trial.OVERALL SCORE (circle one for each trial)PASS FAILPASS FAIL1st SupplementalExaminer SignatureDate2nd SupplementalExaminer SignatureDateExaminee’s Record Slump MeasurementSlump First TrialSlump Second TrialWMTC Concrete Field Testing Technician Performance Exam7 of 14

Test Method WYDOT 479.0 as per ASTM C138Density (Unit Weight) and YieldNameFirst TrialPass FailSecond TrialPass Fail1.Dampen the interior of the measurer and remove anystanding water from the bottom of measure. (Para 6.2)2.Determine the mass (lb) of the empty measurer to beused and place it on a flat, level, firm surface. (Para6.2)PassFailPassFail3.Using a scoop, place the concrete in the measurer inthree layers of approximately equal volume, movingthe scoop around the perimeter of the measureropening to ensure an even distribution of the concrete.PassFailPassFailB) Rod the layer 25 times, uniformly over the crosssection, with the rounded end of the rod. Rod the layerthroughout its depth using care not to damage thebottom of the measure. (Para. 6.3)PassFailPassFailC) Tap the sides of the measurer 10 to 15 times withthe mallet to close any voids left by the tamping rodand to release any large bubbles of air. (Para. 6.3)PassFailPassFailFor the second layer:A) Fill the measurer to approximately 2/3 of its volume.(Para. 6.3)PassFailPassFailB) Rod the layer 25 times, uniformly over the crosssection, with the rounded end of the rod. Rod throughthe layer and into the layer below approximately 1 in.(Para. 6.3)PassFailPassFailC) Tap the sides of the measure 10 to 15 times withthe mallet to close any voids left by the tamping rodand to release any large bubbles of air. (Para. 6.3)PassFailPassFailFor the third layer:A) Add material so as to avoid overfilling. (Para. 6.3)PassFailPassFailFor the first layer:A) Fill the measurer to approximately 1/3 of itsvolume. (Para. 6.3)4.5.WMTC Concrete Field Testing Technician Performance Exam8 of 14

Test Method WYDOT 479.0 (ASTM C138)Density (Unit Weight) and YieldB) Rod the layer 25 times, uniformly over the crosssection, with the rounded end of the rod. Rod throughthe layer and into the layer below approximately 1 in.(Para. 6.3)First TrialPass FailSecond TrialPass FailC) Tap the sides of the measurer 10 to 15 times withmallet to close any voids left by the tamping rod andto release any large bubbles of air. (Para. 6.3)PassFailPassFail6.After consolidating the third layer, an approximate 1/8in. of excess concrete above the top of the measureris considered optimal. Representative material can beadded or removed as needed prior to strike-off. (Para.6.5)PassFailPassFail7.Strike-off the top surface of the concrete and finish itsmoothly with the flat strike-off plate, leaving themeasurer just level full:PassFailPassFailB) Place the plate on top of the measurer to cover theoriginal 2/3 of the surface. Advance it with a verticalpressure and a sawing motion to cover the wholesurface of the measurer. Continue to advance theplate until it slides completely off the measurer. (Para.6.6)PassFailPassFailC) Incline the plate and perform several strokes withthe edge of the plate to produce a smooth finish.(Para. 6.6)PassFailPassFail8.Completely clean the exterior of the measure anddetermine the mass of the measure filled withconcrete. (Para. 6.7)PassFailPassFail9.Report the density (unit weight) of the concrete to thenearest 0.1 lb/ft3. (Para. 7.1 and 8.1.4)PassFailPassFailA) Press the strike-off plate on the top surface of themeasure to cover 2/3 of the surface. Withdraw theplate with a sawing motion to finish only the areaoriginally covered. (Para. 6.6)D (Mc – Mm)/Vm where D density: Mc mass ofmeasure concrete; Mm mass of measurer; Vm volume of measurerWMTC Concrete Field Testing Technician Performance Exam9 of 14

Test Method WYDOT 479.0 (ASTM C138)Density (Unit Weight) and YieldTo pass this performance exam, each individual step must be passed on either the firstor second trial. If the examinee fails one of the steps, examinee should finish the trial.OVERALL SCORE (circle one for each trial)PASS FAILPASS FAIL1st SupplementalExaminer SignatureDate2nd SupplementalExaminer SignatureDateExaminee’s Calculations and Recorded DensityDensity First TrialDensity Second TrialWMTC Concrete Field Testing Technician Performance Exam10 of 14

Test Method 481.0 as per ASTM C231Air Content of Freshly Mixed Concrete by the Pressure MethodNamePERFORMED IN CONJUNCTION WITH ASTM C138 - DENSITYFirst TrialPass FailSecond TrialPass Fail1.Thoroughly clean the flange/rim of the measuringbowl and cover assembly. (Para. 8.3.1)2.Clamp the cover assembly to the measuring bowlensuring a pressure-tight seal. (Para. 8.3.1)PassFailPassFail3.Close the main air valve between the air chamber andmeasuring bowl. Open both petcocks on the cover.(Para. 8.3.1)PassFailPassFail4.Use a syringe to inject water through one petcockuntil water emerges from the opposite petcock. Jarthe meter gently until all air is expelled from theopposite petcock. (Para. 8.3.1)PassFailPassFail5.Close the air bleeder valve and pump air into the airchamber until the hand on the dial gauge is on theinitial pressure line. Allow a few seconds for thecompressed air to cool. (Para. 8.3.2)PassFailPassFail6.Stabilize the gauge hand at the initial pressure line bybleeding, pumping, and lightly tapping the gauge byhand. (Para. 8.3.2)PassFailPassFail7.Close both petcocks. (Para. 8.3.2)PassFailPassFail8.Open the main air valve between the air chamber andmeasuring bowl. Tap the sides of the measuring bowlsmartly with the mallet. Lightly tap the pressure gaugeby hand to stabilize the gauge hand. (Para. 8.3.2)PassFailPassFail9.Read the percentage of air on the dial (counterclockwise) of the pressure gauge. (Para. 8.3.2)PassFailPassFailRelease the main air valve. Release the pressure inthe bowl by opening both petcocks before removingthe cover. (Para. 8.3.2)PassFailPassFail10.Provide the aggregate correction factor to the examinee.WMTC Concrete Field Testing Technician Performance Exam11 of 14

Test Method WYDOT 481.0 (ASTM C231)Air Content of Freshly Mixed Concrete by the Pressure Method11.Report the air content to the nearest 0.1% usingthe aggregate correction factor (or to the nearest1/2 scale division if the gauge reading exceeds8%). (Para. 10.1.1)First TrialPass FailSecond TrialPass FailAs A1 – Gwhere As total air content; A1 meter reading,G aggregate correction factor (provided)To pass this performance exam, each individual step must be passed on either the firstof second trial. If the examinee fails one of the steps, examinee must finish the trial.OVERALL SCORE (circle one for each trial)PASS FAILPASS FAIL1st SupplementalExaminer SignatureDate2nd SupplementalExaminer SignatureDateExaminee’s Recorded Total Air ContentTotal Air Content First TrialTotal Air Content Second TrialWMTC Concrete Field Testing Technician Performance Exam12 of 14

Test Method 485.0 as per ASTM C31Making and Curing Concrete Test Specimens in the FieldNameSIZE OF CYLINDER MOLD 4 IN. X 8 IN.First TrialPass FailSecond TrialPass Fail1.Use a scoop to place concrete in the mold. Use careto distribute the material evenly around the perimeterof the mold. (Para. 9.2)2.For the first layer:A.) Fill the mold with approximately 1/2 the volumewith concrete. (Para. 9.2, Table 4, and 9.4.1)PassFailPassFailB) Rod the layer 25 times, uniformly over the crosssection, with the rounded end of the rod. Rod thelayer throughout its depth using care not to damagethe bottom of the mold. (Para. 9.4.1 and Table 4)PassFailPassFailC) Tap the outsides of the mold lightly 10 to 15 timeswith the mallet to close any holes left by rodding andto release any large air bubbles that may have beentrapped. Use an open hand to tap cylinder molds thatare susceptible to denting or other permanentdistortion if tapped with a mallet. (Para. 9.4.1)PassFailPassFailFor the second layer:A.) Fill the mold to the top. (Para. 9.2, Table 4, and9.4.1)PassFailPassFailB) Rod the layer 25 times, uniformly over the crosssection, with the rounded end of the rod. Rod throughthe layer and into the layer below approximately 1 in.(Para. 9.4.1)PassFailPassFailC) Tap the outsides of the mold lightly 10 to 15 timeswith the mallet to close any holes left by rodding andto release any large air bubbles that may have beentrapped. Use an open hand to tap cylinder molds thatare susceptible to denting or other permanentdistortion if tapped with a mallet. (Para. 9.4.1)PassFailPassFailDuring consolidation of the top layer, adjustconcrete level of underfilled and overfilled molds, ifnecessary. (Para. 9.4.1)PassN/AFailPassN/AFail3.4WMTC Concrete Field Testing Technician Performance Exam13 of 14

Test Method 485.0 (ASTM C31)Making and Curing Concrete Test Specimens in the FieldFirst TrialSecond Trial5.Strike off any excess concrete with the tampingrod, or with a handheld float or trowel ifappropriate, to produce a flat even surface. (Para.9.5.1)PassFailPassFail6.Provide protection to prevent sample moistureloss. (Para. 10.1.2.2)PassFailPassFail8.What must be done after finishing the specimen?PassFailPassFailExaminee must provide verbal answers to abovequestion that agree with boldface type below. Mark the specimen to identify the concrete itrepresents (Para. 9.6) Move the specimen to an initial curing placefor storage (Para. 10.1.1)To pass this performance exam, each individual step must be passed on either the firstor second trial. If the examinee fails one of the steps, examinee should finish the trial.OVERALL SCORE (circle one for each trial)PASS FAILPASS FAIL1st SupplementalExaminer SignatureDate2nd SupplementalExaminer SignatureDateWMTC Concrete Field Testing Technician Performance Exam14 of 14

Nov 16, 2020 · ASTM C1064 - Temperature of Concrete Pass Fail Pass Fail WYDOT 477.0 ASTM C172 - Sampling Freshly Mixed Concrete Pass Fail Pass Fail WYDOT 480.0 ASTM C143 - Slump of Hydraulic-Cement Concrete Pass Fail Pass Fail WYDOT 479.0 ASTM C138 - Density (Unit Weight) and Yield Pass Fail Pass Fail WYDOT 481.0

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