What determines the need for slurry bedding backfill
What determines the need for slurry bedding backfill
(OP)
What would determine the need to use a slurry bedding backfill rather than a sand bedding backfill?
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What determines the need for slurry bedding backfill
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What determines the need for slurry bedding backfillWhat determines the need for slurry bedding backfill(OP)
What would determine the need to use a slurry bedding backfill rather than a sand bedding backfill?
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RE: What determines the need for slurry bedding backfill
RE: What determines the need for slurry bedding backfill
For instance, when is it permittable to use a sand bedding, a slurry bedding, a concrete saddle bedding, etc.
RE: What determines the need for slurry bedding backfill
Slurry also provides other advantages for the owner over sand such as:
1) it is relatively impermeable which prevents water from flowing through the pipe bedding along the trench.
2) Assume another trench is dug (without shoring) near an existing waterline (or gas or sewer) shaded with sand and assume the trench wall starts to cave - the sand can flow into the new trench and cause movement and potentially a break in the existing waterline.
3) it protects the pipe during future excavation. The backhoe operator will know when he finds the waterline trench as he will see and feel the hardened slurry before he actually strikes the waterline with the bucket.
RE: What determines the need for slurry bedding backfill
Thanks,
RE: What determines the need for slurry bedding backfill
RE: What determines the need for slurry bedding backfill
RE: What determines the need for slurry bedding backfill
RE: What determines the need for slurry bedding backfill
Although sometimes trench formations are filled with concrete, this is unlikely to assure long term stability in all cases, and a form of flexible bedding construction is the preferred method of dealing with the situation.
The trench formation should be over excavated by 24" to 30", depending on the bearing strength of the soil. Gravel reject material is then compacted in layers to form a firm trench bottom. A 2" thickness of lean-mix concrete is then placed as blinding. The pipe is then laid on granular bedding material.
Slurry is usually used as a blinding layer. Clays and silts are highly susceptible to softening when in contract with water. Clay formations are protected with blinding concrete or with foundation concrete as soon as possible after completion of the excavation. If not protected, the clay will swell and then must be removed.
Slurry is also sometimes used to protect and stabilize excavated sloped areas from storm water.