ACI Certification- exam 2024 with 100% correct answers
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Course
ACI Certification
Institution
ACI Certification
ASTM C1064 Answer - 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. Answer - 3"
The temperature measuring device shall have a capacity ...
ACI Certification- exam 2024 with 100% correct answers
ASTM C1064 Answer ✔✔ - 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. Answer ✔✔ - 3"
The temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete to ± ______ °F throughout a range of ____________. Answer ✔✔ - 1 degree, 30 degrees to 120
degrees
The temperature measuring device shall be calibrated ______ , or whenever there is a question of ______ . Answer✔✔ - Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? Answer ✔✔ - True
The temperature of concrete may be measured in a wall form. True or False? Answer ✔✔ - True
What must be done to the sample container prior to sampling the concrete? Answer ✔✔ - Dampen with water
What must be done to the concrete surrounding the temperature measuring device after the device is submerged in the fresh concrete? Answer ✔✔ - Close off air voids by gently pressing the concrete around the device
How long must the temperature measuring device remain in the freshly mixed concrete? Answer ✔✔ - minimum of two minutes, maximum of five minutes The temperature of the concrete is reported to the nearest ______ °F Answer ✔✔ - 1 degree
A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True or False? Answer✔✔ - False
ASTM C172 Answer✔✔ - Standard Practice for Sampling Freshly Mixed Concrete
Sampling by this method is required when tests are to be made to determine _____ with specification requirements. Answer ✔✔ - Compliance
This method covers sampling from four types of mixers, which are _____ , _____ , _____ , and _____ . Answer✔✔ - Stationary mixers, paving mixers, revolving drum mixers and open top mixers
The maximum allowable time between obtaining the first and final portions of a composite sample is _____ minutes. Answer ✔✔ - 15
Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample. True or False? Answer✔✔ - True
The maximum elapsed time allowed between obtaining the final portion of the composite sample and beginning the tests for slump, temperature, and air content is _____ minutes. Answer ✔✔ - 5
The molding of strength test specimens shall begin within _____ minutes after fabricating the composite
sample. Answer✔✔ - 15
The concrete sample must be protected from contamination and _____. Answer ✔✔ - Rapid evaporation
The minimum size sample for making strength test specimens is _____. Answer ✔✔ - 1 cubic foot
When sampling from a stationary mixer, the batch must be sampled at _____ or more regularly spaced intervals during discharge of the middle portion of the batch. Answer ✔✔ - 2 The composite sample for a paving mixer must represent a minimum of _____ different portions of the batch of concrete taken from the pile after discharge. Answer ✔✔ - 5
When sampling from a revolving drum truck mixer, concrete must be sampled at a minimum of _____ regularly spaced intervals during discharge of the middle portion of the batch. Answer ✔✔ - 2
Concrete samples from a truck mixer must be obtained before any water or admixtures are added to the
mixer at the job site. True or False? Answer ✔✔ - False
The composite sample from a truck mixer must be obtained from the _____ portion of the batch. Answer✔✔ - middle
When the concrete contains aggregate larger than that permitted for a particular test method, the sample of concrete must be _____ _____ before making the test. Answer ✔✔ - wet sieved
What must occur before a sample of concrete can be taken from a revolving drum mixer? (Oral Exam) Answer✔✔ - All of the water must be added to the mixer
Describe the different procedures that can be used to collect a sample of concrete from a stationary or revolving drum mixer. (Oral Exam) Answer ✔✔ - Repeatedly pass a receptacle through the entire discharge stream, Completely divert the discharge stream into a sample container
What are the required steps for collecting a sample of concrete from a stationary or revolving drum mixer? (Oral Exam) Answer ✔✔ - Collect two or more portions of concrete, Take the portions at regularly
spaced intervals, Take the portions from the middle of the batch
Describe the procedure for collecting a sample of pavement concrete deposited on grade. (Oral Exam) Answer✔✔ - Discharge the contents of the paving mixer, Obtain samples from at least five different portions of the pile
What is the minimum size for a sample when strength test specimens are to be molded? (Oral Exam) Answer✔✔ - 1 cubic foot (28 L)
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