ACI Aggregate Testing Technician - Level 1 - Section 8 Qs&As 2025 (AASHTO T 21 / ASTM C40 Standard Method of Test for Organic Impurities in Fine Aggregates for Concrete) AASHTO T 21 / ASTM C40 This test method involves the use of hazardous materials. - ANS-True AASHTO T 21 / ASTM C40 The user of these standards is responsible for any safety problems associated with them. - ANS-True AASHTO T 21 / ASTM C40 The principal value of this test is to furnish a warning that injurious amounts of ____ may be present. - ANS-Organic impurities AASHTO T 21 / ASTM C40 A dark color in the test sample is a warning sign. - ANS-True AASHTO T 21 / ASTM C40 When a sample subjected to this test produces a color lighter than the standard color solution, it is advisable to perform the test for the effect of organic impurities on the strength of the mortar. - ANS-F
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