×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

# Flowable Fill Mix Proportions

## Flowable Fill Mix Proportions

(OP)
I am having a contractor backfill an over-excavated spread footing with flowable fill. The volume required is less than a yard (27 cubic feet) so I am providing the contractor with a mix proportion by volume for the material. Several articles give the mix design based on weight, but the mix will be prepared onsite and weight measurement is not an option. The volume conversion is for a mix design given by weight by the American Concrete Pipe Association which is for 1 yard of mix = 100 lbs cement + 3000 lbs sand (saturated surface dry) + 600 lbs water. When calculating equivalent volumes, there is a question of what density of portland cement should used in the weight-volume conversion. There are two values discussed in mix design: 94 pcf and 197 pcf, the latter value calculated using the specific gravity of portland cement = 3.15. Intuitively, I think the 94 pcf is more reasonable.

Any comments or suggestions are welcome.

### RE: Flowable Fill Mix Proportions

94 sounds right. I haven't bought a bag of cement for a while but I recall that's what a bag weighs.

### RE: Flowable Fill Mix Proportions

A Google search puts cement at 94 lbs/cu ft.

#### 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.

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!