Posted by dpendzic on December 07, 2011 at 06:01:40 from (24.191.49.134):
In Reply to: Re: Shop floor is dirt posted by Bob Huntress on December 06, 2011 at 21:46:21:
Rebars, mesh and fibers are put into slabs on grade to limit the size of cracks that may develop and hold the concrete together.--Usually placed at the top area of the slab to counter act the tensile stresses due to shrinkage and temperature change. If you have very substantial concentrated loads then reinforcement in the bottom of the slab helps prevent that area from cracking. The key to having a slab not crack is to have a very good subase under it that will provide proper support, low water content to reduce shrinkage, and a good quality concrete of a minimum of 3000 psi compressive strength
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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