Loading
Notes
Study Reminders
Support
Text Version

Lesson Summary - Underwater and Roller-Compacted Concrete

Set your study reminders

We will email you at these times to remind you to study.
  • Monday

    -

    7am

    +

    Tuesday

    -

    7am

    +

    Wednesday

    -

    7am

    +

    Thursday

    -

    7am

    +

    Friday

    -

    7am

    +

    Saturday

    -

    7am

    +

    Sunday

    -

    7am

    +

The main points from this module are as follows:

- For ordinary underwater concrete, highly cohesive mix proportions are required to minimise material segregation.
- Anti-washout admixtures with designated capacity should be used on anti-washout underwater concrete.
- For concrete meant for marine structures, Cement should be replaced with an appropriate amount of ground granulated blast furnace slag or fly ash, which is highly resistant to seawater's action.
- Fresh concrete that is to be compacted by a roller should be dry to the extent of resisting the roller's sinking.
- Roller compacted concrete is mainly used where large volumes of concrete are required with a further condition that it is largely unreinforced such as in gravity dams and pavements