The Low Strength Concrete Floor Slab

Floor joists capacities carrying capacities of domestic timber floor joists grade c in metric units.

The low strength concrete floor slab.

When a concrete floor slab is subjected to forces it flexes and bends. Concrete strength is measured by the weight in can withstand 28 days after it has been laid and cured. C10 with a strength of 8 newtons is designed for kerb backing and bedding. Flexural strength is used as another indirect measure of tensile strength.

These forces are a result of gravity pulling down on the slab while additional weight is applied to the top of the slab. Our concrete strengths range from grade c10 to c40. This groundbreaking product was designed to deliver all the advantages of the industry s most effective building materials in a single cost effective. Controlled low strength material clsm or lean concrete sub base.

It sounds like you are asking what thickness and psi strength is needed to hold a fully loaded semi truck and trailer. A modulus of sub grade reaction of 400 to 500 psi inch can be used in calculating the required thickness of floors placed directly on lean concrete and cement treated or roller compacted sub bases. Concern is often expressed about the capacity for the column loads to be transferred through the relatively weaker slab. Concrete walls estimate volume in concrete walls.

T slab is an all new patented slab system that leverages the time tested principles of roman arch design and multiple concrete types to deliver a stronger lighter and more versatile slab. Concrete mixtures cement sand and gravel mixtures. The bending and flexing creates high tensile forces that can cause the concrete floor slab to crack see figure 1. Flexural strength of concrete.

C40 our strongest concrete with a strength of 40 newtons is designed to withstand heavy duty loads. Floors live loads floors and minimum uniformly distributed. Generally cement treated and lean concrete sub bases are 4 to 6 inches thick. The split tensile strength of concrete is determined using a split tensile test on concrete cylinders.

The actual average cylinder strength for the floor concrete was 3630 psi. High strength columns and normal strength slabs. The economic design of a high rise frame building may call for high strength concrete in the columns and a lower strength in the floor slabs. If that s the case it takes some math and the numbers will be slightly fudged as the weight is not perfectly distributed to ea.

Four months after the floor was placed 10 cores were drilled measured and tested in compression. The specification for the floor of a maintenance building called for a 6 inch slab thickness and concrete with a design compressive strength of 3000 psi.