Double Mat Slab

Typically reinforced with a double layer of rebar throughout its pad a mat slab is capable of bearing loads at virtually any point and distributing heavy loads across an expanse of weak subsoil.

Double mat slab.

Rigid frame mat this type of mat is used when columns carry extremely heavy loads. In your turn down you can have an extra piece of rebar running parallel to your upper rebar mat. Per code section 7 12 2 2 the bar spacing is limited to five times the slab thickness or 18 in. The edge of your slab should be thicker than the slab.

Two layers one mat or four layers two mats at both the top and bottom. If you re pouring a 4 inch pad the turn down at the edge of the form can be 6 to 8 inches thick with your reinforcement rebar off the ground. Though little known 10 years ago today mat slabs are a standard solution for building sites with difficult soil conditions. In such design basement walls act as ribs or deep beam.

Code section 15 10 4 also sets the maximum spacing of mat reinforcement at 18 in. These double meshes are important to space properly. The range for a negative number of type double is between 1 79769 x 10 308 and 2 22507 x 10 308 and the range for positive numbers is between 2 22507 x 10 308 and 1 79769 x 10 308. For more information on double and single precision floating point values see floating point numbers.

This is called a turn down. Bars that are placed in the interior layers should follow. Fig 4 shows a typical rigid frame mat. Matlab constructs the double data type according to ieee standard 754 for double precision.

In the mat foundations we have to provide double chair bar in the foundation to support the mesh properly. For practical purposes according to pca s design and control of concrete mixtures kosmatka kerkhoff and panarese portland cement association 2002 slabs and footings more than 3 feet thick qualify as mass concrete.