Calcium Aluminate Cement

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Last updated 9:53 AM on 5/2/26
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7 Terms

1
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Hydration reactions for CA (monocalcium aluminate) - long

2
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Properties of CAC (4)

  • Faster strength developement than CEM 1 (PC) but sets in similar time

  • Good chemical resistance (eg sulfates)

  • Can use at low temps

  • Used w refractory aggregate to form refractory castables (good mechanical strength and dry heat resistance)

3
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Conversion reactions

  • above 27C

4
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explain strength changes as a result of conversion

  • strength ↓ over time THEN ↑

  • C3AH6 is denser than CAH10 and C2AH8

  • low w/c = ↓ water & space BUT conversions ↑ porosity (& release water) so ↓ strength

  • new space can be filled w the other hydration products so ↑ strength

5
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CAC-GGBS mixes

  • Stratlingite forms instead of CAH10 & C2AH8

  • No conversion reactions so no porosity increase

  • Stratlingite strength constant over time.

6
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compare CAC to PC properties

  • sets in similar time

  • CAC strength development faster

  • 1 day CAC strength > 28day PC

  • heat of hydration lower

7
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CAC-OPC property & why

  • reduced setting times (flash set can occur)

  • CAC setting accelerated by gypsum & CH from OPC

  • OPC setting accelerated by gypsum. Aluminates from CAC react to from ettringite.