×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

coefficient of friction: concrete on concrete

coefficient of friction: concrete on concrete

coefficient of friction: concrete on concrete

(OP)
what is a representative coefficient of sliding friction for concrete on concrete or concrete on mud-mat?

RE: coefficient of friction: concrete on concrete

Coeff of limiting friction for concrete on concrete is taken generally as 0.4 in the UK

This is listed in Table 19 of BS 5975 for various contact materials

Andy Machon

 
 

RE: coefficient of friction: concrete on concrete

Your mention of 'mud' suggests that there is water present.  The coefficients of friction given in textbooks are usually for dry conditions.  The presence of water trapped below a foundation in a mud or clay can make large differences to coefficient of friction and you should try to control or make allowance for any pore water pressures.

Richard Beneke.

RE: coefficient of friction: concrete on concrete

The term "mud mat" does not refer to concrete in its wet, plastic state.  Rather, it refers to a slab on grade (usually unreinforced, low strength, 2-3 inches thick) used to produce a clean, uniform working surface so the foundation work does not occur in the mud.  It is also called by other names, including "rat slab" and "mud slab".

RE: coefficient of friction: concrete on concrete

Surely a concrete base is unlikely to slide on a 'mud mat' (I think that also is known as 'blinding concrete' ?).

If the foundation soil is sufficiently soft to require a mud mat, then the concrete base is much more likely to slide TOGETHER WITH THE MUD MAT, on the underlying soil.  Thus the controlling coefficient of friction depends on the soil properties.

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close