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Re: Pea Gravel Concrete[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: Pea Gravel Concrete
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 11 Dec 1997 15:40:14 GMT
- Cc: seaoc(--nospam--at)seaoc.org
seaoc(--nospam--at)seaoc.org,Internet writes: Can anyone tell me if there could be potential problems in approving the contractor to use pea gravel rather than 1" rock concrete mix as specified on the plans? The concrete is used for a 3,000 psi grade beam in a two-story type V residential building. Paul Willow Some general ways aggregate size can influence concrete. Agregate surface needs to be coated with cement paste. Smaller aggregate has a greater the surface area requiring more cement paste (and water as a lubricant) which increases shrinkage. You want as much of the volume as possible to be filled up with aggregate. By using pea gravel you will need more sand to fill up the smaller voids, hence more cement paste to coat the surfaces giving lower strength and higher shrinkage. "Generally speaking", smaller aggregate size gives lower strength concrete for a given water/cement ratio. The next question I would have is "Does this mix design meet requirements if ACI chapter 5 (UBC 1905)"? Does this pea gravel mix design have a historical record of testing showing it meets the required strength per ACI code? __________________________________________________ Richard Lewis, P.E. Missionary TECH Team rlewis(--nospam--at)techteam.org The service mission like-minded Christian organizations may turn to for technical assistance and know-how.
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