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AASHTO T 248 / ASTM C702 Unless the procedures recommended here are carried out precisely, a ____ sample can result. ☑: Nonrepresentative AASHTO T 248 / ASTM C702 Generally speaking, small samples are most representative of the total supply. True or False? ☑: False; large samples are mo...

This test method involves the use of hazardous materials. True or False? ☑: True The user of these standards is responsible for any safety problems associated with them. True or False? ☑: True The principal value of this test is to furnish a warning that injurious amounts of ____ may be pr...

Unless the procedures recommended here are carried out precisely, a ____ sample can result. ☑: Nonrepresentative Generally speaking, small samples are most representative of the total supply. True or False? ☑: False; large samples are more representative There are some instances in which _...

In this test method a set of sieves with progressively _____ openings determines the ______ of the size of the particles sampled. ☑: Smaller, distribution The purpose of the test is to determine the _____ of the materials used as aggregates or proposed to be used as aggregates. ☑: Grading ...

The total time allowed between obtaining the first and final portions of a composite sample is ☑: 15 minutes When it is necessary to wet sieve the concrete sample, wet sieving should be performed after the individual samples are remixed into a composite sample (T or F) ☑: F Tests for slump...

The method of determining air content of concrete containing lightweight aggregate is the pressure method ☑: False. Relatively dense Is the following statement true or false? When making a test cylinder from concrete being used in construction, the field technician must also measure the slump...

1. Which of the following statements is false? Aggregates are sampled: A. For the acceptance or rejection of materials B. For the control of operations at the site of use C. For preliminary investigation of the potential source of supply D. For the control of the product at the source of supply ...

Following are three of the four purposes for which aggregates are sampled; supply the fourth. Aggregates are sampled: a) for the acceptance or rejection of materials. b) for the control of operations at the site of use. c) for preliminary investigation of the potential source of supply. d) __...

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) ☑: False (2-5 minutes) The temperature measuring device must be accurate to within 0.1 degree. (T or F) ☑: ...

ASTM C1064 ☑: Standard Test Method For Temperature of Freshly Mixed Hydraulic-Cement Concrete The sensor of the temperature measuring device shall be submerged a minimum of ______ inches into the freshly mixed concrete. ☑: 3" The temperature measuring device shall have a capacity of measu...

The sensor of the temperature measuring device shall be submerged a minimum of _____ in. [_____mm] into the freshly mixed concrete. ☑: 3 in. [75 mm] The temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete to +- _____ degrees F [+- _____ C] thr...

Q1. Start molding specimens for strength tests within 30 minutes after fabricating the composite sample. A. True B. False ☑: B. False ASTM C172 -Para (4.1.2) - Start molding. specimens for strength tests within 15 min after fabricating the composite sample. Q2. The maximum allowable time ...