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RE: Shrinkage of flowable fill against a stone wall[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Shrinkage of flowable fill against a stone wall
- From: Harold Sprague <spraguehope(--nospam--at)hotmail.com>
- Date: Wed, 6 Feb 2008 21:09:00 +0000
For what you have described, I would go for the first option. For what it is worth the officially ACI ordained term for this stuff is Controlled Low Strength Material (CLSM). |
Secondly, you might want to consider the effect of the additional weight of the CLSM on the structure in general. Try to avoid causing settlement problems with the added weight.
You can specify relatively low densities with CLSM, but you can "fill" the space with expanded shale aggregate (very light weight) and cast a 4" concrete slab on top and have a reduced weight and cost. I would still encourage the addition of the concrete walls along the back side to knit the masonry wall together. I would also encourage a bond breaker of some sort to whatever you provide to fill up the space. If the expanded shale is used, there is no need for the bond breaker except for the concrete cap slab.
I would avoid shrinkage compensating additives. Shrinkage compensating compounds are difficult to predict and begin by expanding the volume. This can complicate matters. Let the supplier know what you want with shrinkage (and expansion) and let him make some suggestions. Controlling the amount of cement, fly ash, aggregate, and water are more effective. You should also consider placing the CLSM in plan blocks similar to how a concrete dam is constructed. This allows one block to shrink and you fill in with the adjacent block after the first one has undergone shrinkage.
I just finished assessing a project where they filled a depressed area with concrete. this added a lot of weight to the soil and caused a lot of settlement problems.... oops!
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