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Includes true/false and multiple-choice items based on ASTM C1064 temperature measurement requirements, ASTM C172 sampling of freshly mixed concrete timing and sample handling, and ASTM C143 slump test procedures such as filling layers, rodding, lifting the cone, measurement timing, and acceptable calculation 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does ASTM C1064 require for thermometer contact time in fresh concrete?","Question",{"text":63,"@type":64},"For concretes with aggregates less than 3 inches, the thermometer must remain in the fresh sample at least 5 minutes or until the temperature reading stabilizes.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"How does ASTM C172 limit the time between obtaining the first and last portions of a composite sample?",{"text":68,"@type":64},"The maximum allowable time between the first and last portions of the composite sample must not exceed 5 minutes.",{"name":70,"@type":61,"acceptedAnswer":71},"What is a key procedural requirement for the ASTM C143 slump test lifting of the cone?",{"text":72,"@type":64},"The slump cone must be raised carefully, vertically upward, in a steady motion, with a specified time limit between filling and cone 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Temperature of Freshly Mixed Hydraulic – Cement Concrete  \n1. For concrete with aggregates less than 3 inches, the thermometer must remain in the fresh concrete sample a minimum of 5 minutes or until the temperature reading stabilizes. (T or F)  \n2. The temperature measuring device must be accurate to within 0. 1° . (T or F)  \n3.. The temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete throughout a range of  to  °F ( to °C)  \n4. A composite sample is not needed if only the temperature test is being run. (T or F)  \n5. The temperature of fresh concrete in a placement must be measured by inserting a thermometer into the top six inches of concrete. (T or F)  \n6. The temperature of the concrete is recorded to the nearest  °F ( °C) .  \n7. ASTM C1064 states the container used to measure temperature of concrete must be large enough to provide at least 5 inches of concrete around the sensor. (T or F)  \n8. Calibrate the temperature measuring device at least   , or whenever there is a question of accuracy.  \na. Annually b. monthly c. weekly d. daily  \n9. After the thermometer is placed in the concrete:  \na. Gently press concrete around the thermometer  \nb. Cool the surface of concrete with water  \nc. Tap the side of the container 10-15 times  \nd. All of the above  \n10. According to ASTM C1064, what is one reason to take the temperature of concrete?  \na. Verify conformance b. Verify ambient air temperature  \nc. Verify slump d. None of the above.  \n11. It is allowable to remove the temperature measuring devices from the freshly mixed concrete to read the temperature if you cannot see the reading. (T or F)  \nASTM C172  \nStandard Test Method for Sampling Freshly Mixed Concrete  \n1. The maximum allowable time between obtaining the first and last portions of the composite sample may not exceed 5 minutes. (T or F) .  \n2. Start molding specimens for strength tests within 30 minutes after fabricating the composite sample.(T or F)  \n3. The composite concrete sample must be protected from sun, wind, contamination and rapid evaporation. (T or F)  \n4. If the concrete contains aggregates larger than those that are appropriate for a size of mold or equipment used, the sample should be wet-sieved before making the test. (T or F)  \n5. The composite sample should not be remixed before beginning any tests. (T or F)  \n6. Sampling should normally be performed, as the concrete is discharged from the mixer. (T or F)  \n7. ASTM Method C172 includes sampling from stationary mixers, paving mixers, truck mixers, agitators, and non-agitating equipment. (T or F)  \n8. After sampling is completed, start the tests for slump and air content within:  \na. 2 ½ minutes b. 10 minutes c. 15 minutes d. None of the above  \n9. In any case, do not obtain samples until:  \na. All the water and admixtures have been added to the concrete  \nb. 200 revolutions of the drum have been obtained  \nc. ½ of the water has been added  \nd. None of the above  \n10. No samples shall be taken before  or after  of the batch has been discharged.  \na. 10% or after 90% b. 20% or after 90% c. 20% or after 80% d. None of the above  \n11. When strength tests are to be made, the minimum size of the composite sample shall be:  \na. ¼ cubic foot b. 1 cubic foot c. Any convenient size d. 1 Wheelbarrow  \n12. Sample the concrete from the chute of a truck mixer by:  \na. Raising chute to stop the flow and scoop concrete from there into the slump cone and cylinder molds  \nb. Passing a receptacle completely through the discharge steam or by completely diverting the discharge into the sample container  \nc. Holding a shovel in the flow and direct half into a bucket  \nd. None of the above  \n13. Fresh concrete to be tested at the job site should be sampled from:  \na. The beginning of mixer discharge  \nb. The last concrete discharged  \nc. Two or more regularly spaced intervals duri","cbCaiqoXLmsUwsZ4","https://ap.wps.com/l/cbCaiqoXLmsUwsZ4","pdf",213368,17,"English","# ASTM C1064\n## Temperature of Freshly Mixed Hydraulic-Cement Concrete\n# ASTM C172\n## Sampling Freshly Mixed Concrete\n# ASTM C143\n## Slump of Hydraulic-Cement Concrete","[{\"question\":\"What does ASTM C1064 require for thermometer contact time in fresh concrete?\",\"answer\":\"For concretes with aggregates less than 3 inches, the thermometer must remain in the fresh sample at least 5 minutes or until the temperature reading stabilizes.\"},{\"question\":\"How does ASTM C172 limit the time between obtaining the first and last portions of a composite sample?\",\"answer\":\"The maximum allowable time between the first and last portions of the composite sample must not exceed 5 minutes.\"},{\"question\":\"What is a key procedural requirement for the ASTM C143 slump test lifting of the cone?\",\"answer\":\"The slump cone must be raised carefully, vertically upward, in a steady motion, with a specified time limit between filling and cone removal.\"}]","ACI GRADE 1 FIELD TESTING CERTIFICATION PRACTICE TEST - ASTM Test Methods | PDF",1790735318,43]