Table 5 Test items and methods (RFAs) (ASTM International 2012).
From: Evaluation on the Surface Modification of Recycled Fine Aggregates in Aqueous H2SiF6 Solution
Items | Fine aggregates | Conditions | Number of measurement | Standard |
|---|---|---|---|---|
Specific gravity and absorption rate | NFA, RFA | Air-dried specific gravity, over-dry specific gravity | More than twice each | ASTM C 128 |
pH | RFA | [Method-1] RFAs (50 g) + distilled water (300 g) | More than 3 times each | – |
RFA | [Method-2] RFAs (50 g) + distilled water (300 g) 1st stirring → H2SiF6 input → 2nd stirring | More than 3 times each | ||
RFA | [Method-3] RFAs (50 g) + distilled water (300 g) + H2SiF6 stirring | More than 3 times each |