Methods for Evaluating Fly Ash for Use in Highway Concrete (2013) / Chapter Skim
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A-1 These proposed changes to AASHTO M 295, Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete, are the suggestions of the NCHRP Project 18-13 research team. These changes have not been approved by NCHRP or any AASHTO committee nor formally accepted for the AASHTO specifications.
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A-2 Specification Change Commentary Section 2.1 Add references for the new coal fly ash iodine number and direct adsorption isotherm tests. Both are new test methods added to the specification.
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A-3 Table 2 - Supplementary Optional Chemical Requirements Modify Table 2 as shown below. Delete available alkali limits due to limitations and poor precision of the test.
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A-4 Specification Commentary Table 3 - Physical Requirements Modify Table 3 as shown below. Increase the 7- and 28-day limit for the strength activity index (SAI)
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A-5 Specification Commentary Table 4 - Supplementary Optional Physical Requirements Modify Table 4 as shown below. Modifications involve elimination of ASTM C441 and insertion of ASTM C1567 for determining effectiveness in controlling alkali-silica reaction.
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