Evaluating Air-Entraining Admixtures for Highway Concrete (2007) / Chapter Skim
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Pages 38-49
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From page 38... ...
38 Recommended Method for Air-Entraining Admixtures for Highway Concrete and Standard Specification for Air-Entraining Admixtures for Highway Concrete. The proposed methods and specification are the recommendation of NCHRP Project 18-10 Staff at Construction Technology Laboratories Inc.
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From page 39... ...
A-2 PROPOSED STANDARD METHOD FOR AIR-ENTRAINING ADMIXTURE FOR HIGHWAY CONCRETE 1. SCOPE 1.1 This method covers the testing of materials proposed for use as air-entraining admixtures in the field.
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A-3 2.3. ACI Standard: ACI 211.1-91, Recommended Practice for Selecting Proportions for Normal, HeavyWeight and Mass Concrete 3.
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A-4 5.3 Protocol B Structural Concrete 5.3.1 Mix B-1. Plain Concrete: The cement content shall be 605 lb/yd3 and water-cement ratio of 0.39.
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A-6 8.2. Manifestly Faulty Specimens-Each group of specimens representing a given test or a given age of test, including tests of freshly mixed concrete, shall be examined visually before or during the test, or both, whichever is appropriate.
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A-7 9.2.6. Deicer Scaling Test- Prepare specimens in accordance with T126.
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A-8 PROPOSED STANDARD SPECIFICATION FOR AIR-ENTRAINING ADMIXTURES FOR CONCRETE 1. Scope 1.1 This specification covers materials proposed for use as air-entraining admixtures to be added to concrete mixtures in the field.
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From page 46... ...
A-9 to be employed and the criteria to establish equivalence should be stipulated with due regard to the composition and properties of the sample. 4.3 At the request of the purchaser, the manufacturer shall state in writing the chloride content of the air-entraining admixture and whether or not chloride was added during its manufacture.
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From page 47... ...
A-10 Table 1 Physical Requirements Time of setting, allowable deviation from control (minutes) ± 75 minutes Compressive strength (7 and 28 days)
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From page 48... ...
A-11 7.3.2 Uniformity Tests – A sample taken for the purpose of evaluating the uniformity of a single lot or of different lots from the same source will generally be subjected to a limited number of tests as the result of agreement between the purchaser and manufacturer (see Section 4)
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From page 49... ...
A-12 9. Rejection 9.1 The air-entraining admixture shall be rejected if the purchaser desires when it fails to meet any of the applicable requirements of this specification.
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