ACI Field Testing Grade I Exam Guide 2026: FREE Study Plan
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Per ASTM C172, when sampling freshly mixed concrete from a stationary mixer (other than paving mixers), what is the maximum elapsed time allowed between obtaining the first and final portions of the composite sample?
Aci Field Testing Grade I Sampling
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Seven ASTM standards on the ACI Grade I exam
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According to ASTM C172, how many portions must be taken to form a composite sample from a stationary mixer?
Abbreviation on ASTM C1064 field checklists for the calibrated instrument whose sensing portion is submerged at least 3 inches into freshly mixed concrete.
Temperature testing
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Orientation: Certification Requirements, Written Exam, Performance Exam, and Study Sources
1.1 Credential Purpose and Official Definition
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Per ASTM C172, what is the minimum size of a composite sample used for strength tests of freshly mixed concrete?
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ACI Grade I written exam: format and passing rule
Per ASTM C172, within what maximum time after obtaining the final sample portion must tests for slump, temperature, and air content be started?
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Complete 2026 ACI Concrete Field Testing Technician Grade I exam guide. 55-Q, 1-hour written test + 6-procedure performance exam + C172 verbal, ASTM C143/C138/C231/C173/C31/C1064, fees, FREE practice.
Active tip of a concrete thermometer that must be surrounded by a minimum 3-inch thickness of freshly mixed concrete on every side during an ASTM C1064 test.
Per ASTM C172, molding of specimens for strength tests must be started within what time after fabricating the composite sample?
ACI Grade I performance exam requirement
Per ASTM C172, from which portion of a truck mixer (revolving-drum truck) discharge should sampling be done?
Surrounding thickness of freshly mixed concrete around a thermometer's sensing portion, required by ASTM C1064 to measure at least 3 inches and at least triple the coarse aggregate's nominal maximum size.
1.2 Eligibility and the Two-Part Certification Path
Per ASTM C172, how should the composite sample be protected between obtaining the sample and performing tests?
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C172: how many portions and from where in the batch?
ASTM C172 Sampling
Per ASTM C172, after the composite sample is collected from two or more portions of the batch, what must be done before performing any tests?
Permanent immersion line on a partial-immersion liquid-in-glass thermometer indicating how deep the stem must be placed in concrete under ASTM C1064 without applying a correction factor.
Per ASTM C143, what is the inside diameter of the top opening of the slump cone (mold)?
Aci Field Testing Grade I Slump
C172: maximum time between first and final sample portions
Per ASTM C143, the slump mold has bottom and top inside diameters, respectively, of:
Job-site structural enclosures in which ASTM C1064 allows measuring the temperature of freshly mixed concrete directly, without pulling a separate container sample, when minimum surrounding thickness requirements are met.
1.3 Written Exam Format and Dual Passing Rule
Per ASTM C143, how many equal layers is the slump cone filled in, and how many times must each layer be rodded?
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Term Pairs
C172: time limit to START slump, temperature, and air tests
Per ASTM C143, when rodding the middle and top layers of the slump cone, how far should the rod penetrate?
Portion of a mixer's batch discharge from which two or more regularly spaced increments must be collected under ASTM C172, avoiding the very first and last concrete discharged.
Sampling fresh concrete
Per ASTM C143, what are the required dimensions of the tamping rod used for the slump test?
C172: time limit to START molding strength specimens
Per ASTM C143, after striking off the top of the filled slump cone, within what elapsed time from the start of filling must the test be completed (cone lifted)?
Flowing discharge of concrete from a mixer chute that must be completely intersected by a passed receptacle or completely diverted into a sampling container under ASTM C172.
1.4 Performance Exam Format and Grading
Per ASTM C143, how must the slump cone be raised from the concrete once filling and strike-off are complete?
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C172: minimum composite sample size for strength tests
Per ASTM C143, how is the slump measured after the cone is lifted?
To blend combined concrete sample increments with a shovel at the testing location just enough to ensure uniformity before starting field tests under ASTM C172.
Per ASTM C143, what should be done if a portion of the concrete falls away or shears off from one side of the mass during the test?
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