Under ASTM C88, what is the maximum allowable weighted percent loss for coarse aggregate tested with sodium sulfate after five cycles as commonly specified for concrete aggregates?
Durability Testing
Question · Medium
In the ASTM C131 Los Angeles abrasion test for small-size coarse aggregate, how many revolutions does the drum complete at 30 to 33 rpm before the sample is removed for sieving?
Physical Testing
Question · Easy
According to ASTM C1260 (accelerated mortar bar test for ASR), a 16-day expansion greater than what threshold is generally considered indicative of potentially deleterious alkali-silica reactivity?
Asr Testing
Question · Hard
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ASTM C123 uses a heavy liquid with which specific gravity to separate chert (less dense) particles from normal-weight coarse aggregate?
Composition Testing
ASTM C666 Procedure A evaluates freezing and thawing resistance of concrete under what exposure condition?
In ASTM C142, clay lumps and friable particles are identified in the fine aggregate size fraction by which procedure?
ASTM D4791 measures which characteristic of coarse aggregate particles?
Under ASTM C535, the L.A. abrasion test for large-size coarse aggregate uses how many revolutions of the drum?
ASTM C87 measures the effect of organic impurities in fine aggregate on which concrete property?
ASTM C1252 measures uncompacted void content of fine aggregate as an indirect indicator of which property?
In ASTM C227 (mortar bar method for alkali reactivity), what is the typical expansion limit at 6 months that indicates an aggregate is potentially deleteriously reactive?
ASTM C1567 modifies the ASTM C1260 accelerated mortar bar test to evaluate what?
ASTM C586 is used to identify potential alkali reactivity in what type of aggregate?
ASTM C295 petrographic examination of aggregates is most useful for which purpose?
ASTM D5821 determines which property of coarse aggregate, and how is the result expressed?
In ASTM C88, the weighted percent loss is calculated by multiplying the percent loss of each size fraction by which weighting factor?
In ASTM C131, the charge of steel spheres placed in the L.A. machine depends on the grading designation (A, B, C, or D). For grading A, how many spheres are used?
Which of the following supplementary cementitious materials (SCMs) is generally most effective per unit mass at mitigating alkali-silica reaction when combined with a reactive aggregate?
Asr Mitigation
During ASTM C1260 sample preparation, the aggregate is crushed (if necessary) and then sieved into several size fractions and recombined per the standard. What is the purpose of this size regrading?
ASTM C666 Procedure A results are commonly reported as a durability factor (DF). If a concrete specimen reaches 300 cycles with a relative dynamic modulus of elasticity of 85%, what is the durability factor?
ASTM C1105 differs from ASTM C586 because it measures length change of:
Under ASTM C1252 Method A, what is the measured result in mL that is then converted to uncompacted void content as a percentage?
A coarse aggregate source that fails ASTM C88 sulfate soundness but passes ASTM C666 (Procedure A) in concrete should generally be:
What is the sieve typically used to determine the loss percent after L.A. abrasion testing in ASTM C131 and C535?
ASTM C87 requires curing of mortar cubes made with the suspect sand to be compared to control cubes (sand washed with 3% NaOH) at what age?
The prerequisite for taking the ACI Aggregate Testing Technician — Level 2 certification written examination is:
Exam Structure
The ACI Aggregate Testing Technician — Level 2 certification has two components. Which statement best describes the format?
To pass the ACI Aggregate Testing Technician Level 2 written examination, a candidate must achieve what combination of scores?
Which ASTM standard is the primary test for sand equivalent value used in aggregate quality evaluation and specified by many state DOTs?
In an ASR-reactive coarse aggregate source, which field sign is most indicative of alkali-silica reaction in hardened concrete?
Within ASTM C666 the test is terminated when the relative dynamic modulus of elasticity drops to what value, or when the specimen reaches 300 cycles, whichever occurs first?
When performing ASTM C1260 testing, how are the mortar bars stored from the time of casting until the initial 24-hour reading?
In ASTM C88, after each immersion cycle in sulfate solution, how are the aggregate test fractions dried prior to the next cycle?
The charge masses used in L.A. abrasion testing provide a tolerance of ± a small mass. This tolerance is important primarily because:
Which of the following is a common upper limit on L.A. abrasion loss (ASTM C131) for coarse aggregate intended for wearing-surface concrete pavements in many state DOT specifications?
Which expansion limit is commonly used to judge alkali reactivity in ASTM C1293 (concrete prism test, one year at 38 °C)?
ASTM C131 and C535 require that the steel spheres used as the abrasive charge have an average diameter of approximately:
Which of the following correctly describes the ASTM C88 sulfate soundness test specimen preparation for coarse aggregate?
In ASTM D4791, the flat-and-elongated ratio most commonly specified for coarse aggregate in Superpave HMA and some concrete applications is based on which caliper ratio?
When petrographic examination (ASTM C295) is performed on a concrete aggregate source, which of the following mineral constituents would MOST raise concerns about alkali-silica reactivity?
To prevent alkali-silica reaction, ACI 201.2R recommends using supplementary cementitious materials combined with which additional general strategy?
When reporting ASTM C1260 expansion results, at what age is the primary 'deleterious' expansion reading taken?
The performance examination component of the ACI Aggregate Testing Technician Level 2 certification primarily assesses:
Delayed ettringite formation (DEF) in concrete is primarily a concern when:
Durability General
Which sulfate exposure classification from ACI 318 corresponds to water-soluble sulfate in soil greater than about 2.0% (approximately >20,000 ppm in water)?
Which aggregate characteristic is most likely to increase the water demand of a concrete mixture for a given slump?
Which describes the role of the No. 200 wash (ASTM C117) as a Level 1 / Level 2 aggregate quality control check?
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