Entrained Air
Entrained Air
(OP)
I'm curious if the truck driver was too add water to the mix while on site, would the addition of water have any significant effect on the entrained air. Also, how does the amount of time in the mixer affect the entrained air (if at all) for the case if the truck got stuck in a traffic jam for an hour or so? Are there any other things that could happen after batching but before placement that would affect the air content?
Thanks for any info.
Thanks for any info.





RE: Entrained Air
If a truck has been stuck in traffic for an hour, the mix, when it arrives on site should be rejected. Period. Most specifications governing delivery allow 45 minutes from initial batching at the plant to discharge at the job site. Depending on the cement content of the mix, it may already begin to set up and the driver will know before he gets on site that rejection is waiting ahead. In these cases, its only a matter of where to dump the rejected load. Often times the driver will add water so the concrete doesn't set up on him and will travel to the nearest residential foundation as directed by his dispatcher in order to dump the concrete on an unsuspecting buyer.
RE: Entrained Air
RE: Entrained Air
I'm not sure of your location, but light standards must be capable of withstanding several loads, including wind loads. To have that much movement with no significant load is an indication of a problem. I would suggest that you get a local geotechnical engineer to look at the conditions.