Computer · Concrete Technology
According to ASTM C 618, which of the following features correctly differentiates Class C and Class F fly ash?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Class C is inherently acidic in nature; Class F is highly alkaline in nature
- 2Class C contains more than 20% lime and possesses self-cementing properties; Class F contains less than 10% lime and requires a cementing activator✓
- 3Class C originates from bituminous coal; Class F originates from sub-bituminous coal
- 4Class C contains less than 10% lime and requires an activator; Class F contains more than 20% lime and is self-cementing
Correct answer
Class C contains more than 20% lime and possesses self-cementing properties; Class F contains less than 10% lime and requires a cementing activator
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