ASTM C1240-20 PDF Download

The ASTM C1240-20 standard addresses the requirements for silica fume used in concrete and other systems containing hydraulic cement. The standard defines the composition of the material, which is primarily composed of amorphous silica. It also outlines various test methods for chemical analysis, moisture content, loss on ignition, bulk density, specific surface area, air entrainment of mortar, strength activity index, reactivity with cement alkalis, and sulfate resistance of silica fume.

The physical tests included in the standard involve determining the density and specific surface area of the silica fume using the BET nitrogen adsorption method. The standard emphasizes the importance of proper storage of silica fume to ensure easy access for inspection and identification of each shipment.

The standard also provides additional information through notes and footnotes, which serve as explanatory information. It should be noted that these notes and footnotes, except those in tables, are not considered as requirements of the standard. The units used in the standard are in accordance with the International System of Units (SI) and are considered the standard measurement units for this specification. No other units of measurement are included in this standard.