×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

differences in concrete properties using 10mm to 20mm aggregate
3

differences in concrete properties using 10mm to 20mm aggregate

differences in concrete properties using 10mm to 20mm aggregate

(OP)
hi all,

what is the difference in concrete properties whether a 10mm or 20mm aggregate is used?

RE: differences in concrete properties using 10mm to 20mm aggregate

2
Depending on the mix design, either can be used to make essentially any range of concrete strengths.

When you use a smaller aggregate, such as the 10mm as your nominal coarse aggregate size, the specific surface area of the total volume of coarse aggregate is much higher than for the 20mm aggregate. This means that your mix will require more cement, more water and more fine aggregate in order to provide adequate paste coverage of the coarse aggregate and fill the high number of voids, even though the voids will be smaller in volume.

In response to this higher cement and water demand for the same water-cement ratio, you will experience more volumetric shrinkage from the mix from both drying shrinkage and from autogenous shrinkage. This means you will have to pay more attention to the timing and placement of control joints so that you mitigate the increased cracking potential.

RE: differences in concrete properties using 10mm to 20mm aggregate

(OP)
This makes perfect sense. Thanks Ron

RE: differences in concrete properties using 10mm to 20mm aggregate

and you will also develop a higher heat of hydration due to the additional cement

RE: differences in concrete properties using 10mm to 20mm aggregate

Thanks BigH....I forgot to mention that aspect.
As usual, you bail me out!!

RE: differences in concrete properties using 10mm to 20mm aggregate

(OP)
Great work guys. Thanks again

RE: differences in concrete properties using 10mm to 20mm aggregate

Ron - as you know, on a mass concrete dam, that is always our worry - the heat of hydration and density of concrete - not so much regarding strength except on spillways

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources