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 New Hampshire Concrete Cutting Manchester, NH Call Now 603-622-4441 Concrete Cutting - Core Drilling - Wall Sawing - Flat Sawing |
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Concrete Cutting Sawing Brentwood NH New HampshireBrentwood Concrete Cutting Sawing Brentwood NH New Hampshire Welcome
to AffordableConcreteCutting.Net “We
Specialize in Cutting Doorways and Windows in Concrete Foundations” Are You in Brentwood New Hampshire? Do You
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Sawing Brentwood New Hampshire Concrete
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Driller Brentwood NH Core
Drilling Brentwood New Hampshire We provide coring and
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would be practically impossible to produce a yielding by such a method on any
kind of rock or even on compacted gravel. A distinction must be maintained
between the crushing strength of a cube of rock or soil, and the bearing power
of that soil when it lies as a mass of indefinite extent under some structure.
A soil can fail only by being actually displaced by the load above it, or
because it has been undermined, perhaps by a stream of water. A sample of rock
which might crush with comparative ease when tested as a six-inch cube in a
testing machine, will probably withstand as great a concentration of load as it
is practicable to put upon it by any engineering structure. Even gravel which
would have absolutely no strength if it were attempted to place a cube of it in
a testing machine, will be practically immovable when lying in a pit where it
is confined laterally in all directions. The ultimate crushing strength of
stone varies greatly. The crushing strength is usually determined by making
tests on small cubes. Tests made on prisms of a less height than width show a
much greater strength than tests made on cubes of the same material, which
shows that the bearing strength of rock on which foundations are built is much
greater than the cubes of this stone. In Table I, Part I, the lowest value
given for the crushing strength of a cube is 2,894 pounds per square inch,
which is equal to 416,736 pounds per square foot. This shows that any ordinary
stone which is well imbedded will carry any load of concrete placed on it. Sand
and gravel are often found together. Gravel alone, when of sufficient
thickness, makes one of the firmest and best foundations. Dry sand or wet sand,
when prevented from spreading laterally, concrete forms one of the best beds
for foundations; but it must be well protected from running water, as it is
easily moved by-scouring. Clean, dry sand will safely support a load of 3,000
to 8,000 pounds per square foot; and when compact and well cemented, from 8,000
to 10,000 pounds per square foot. Ordinary gravel well bedded will safely bear
a load of 6,000 to 8,000 pounds per square foot; and when well cemented, from
12,000 to 16,000 pounds per square foot. There is great variation in clay
soils, ranging from a very soft mass which will squeeze out in all directions
when a very small pressure is applied, to shale or slate which will support a
very heavy load. As the bearing capacity of ordinary clay is largely dependent
upon its dryness, it is therefore very important that a clay soil should be well
drained, and that a foundation laid on such a soil should be at a sufficient
depth to be unaffected by the weather. If the clay cannot be easily drained,
means should be taken to prevent the penetration of water. When the strata are
not horizontal, great care must be taken to prevent the flow of the soil under
pressure. When gravel or coarse sand is mixed with the clay, the bearing
capacity of the soil is greatly increased. The bearing capacity of a soft clay
is from 2,000 to 4,000 pounds per square foot; of a thick bed of medium dry
clay, 4,000 to 8,000 pounds per square foot, and for a thick bed of dry clay,
8,000 to 10,000 pounds per square foot. The soils of this class include mud,
silt, quicksand, etc., and it is necessary to remove them entirely or to reach
a more solid stratum under the softer soil; or sometimes the soil can be
consolidated by adding sand, stone, etc. The manner of improving such a soil
will be discussed later. In the same way that water will bear up a boat, a
semi-liquid soil will support, by the upward pressure, a heavy structure. For a
soil of this kind, it is very difficult to give a safe bearing value; perhaps
500 to 1,500 pounds per square foot is as much as can be supported without too
great a settlement. The general method of doing this consists in making the
soil denser. Are You in Brentwood New Hampshire? Do You
Need Concrete Cutting? We Are Your Local
Concrete Cutter Call 603-622-4441 We Service Brentwood
NH and all surrounding Cities & Towns |
