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Concrete is very strong under compression, but relatively weak under tension. Concrete may need metal reinforcement to counter that, and a firm support beneath it. If the support beneath the slab is poorly constructed (soil not adequately compacted), the weight of the slab may compress the soil, and the slab will tilt. Portions may sag into the space created, and crack. Some soils, known as "shrink/swell" soils, will expand or contract as the water content changes- during very dry periods, some of the soil supporting the slab will contract, causing the slab to tilt. Movement of earth due to slippage or earthquakes will also cause tipping or sagging. Nearby construction may cause sagging, tilting or cracking, such as blasting, excavation, pile driving, or vibratory soil compaction. Concrete is mixed to different recipes- a mix that contains too much sand/ not enough Portland cement will be weak- as will a slab too thin for the weight load placed on it. You will need an experienced engineer to examine YOUR structure, and determine the causes of your problem. In SOME cases, a sagging slab may be respired by pumping concrete grout under the slab to push it back to a normal position.
What else can I help you with?
Can you pour a concrete slab onto another concrete slab?
No. Concrete won't bond to concrete. It will end up cracking.
What is a raft slab?
Also reffered to as 'slab footing' and it consists of concrete footing beams integrated into the concrete floor slab.
How big can a floating concrete slab be?
no matter how big the concrete slab is, it will never float
Definition of a concrete transfer slab?
what is a ytransfer slab
How many millimeters thick is a concrete slab typically?
A concrete slab's thickness can vary greatly depending on the application. Typically, a concrete slab varies between 500mm to thousands of millimeters.
How much does a concrete foundation slab cost?
Here is an estimate from another site. http://en.allexperts.com/q/Building-Homes-Extensions-2333/slab-foundation.htm
What difference suspended concrete slab between unsuspended concrete slab?
Supended slab are slab not sit on the ground directlySuspended slab is a slab supported by beams.
What are the potential consequences of having no gravel under a concrete slab?
The potential consequences of not having gravel under a concrete slab include uneven settling of the slab, cracking, and structural damage due to poor support and drainage. This can lead to costly repairs and compromised stability of the structure built on top of the slab.
When was Slab-O-Concrete created?
Slab-O-Concrete was created in 1994.
Can you pour a concrete slab onto another concrete slab?
No. Concrete won't bond to concrete. It will end up cracking.
What is a raft slab?
Also reffered to as 'slab footing' and it consists of concrete footing beams integrated into the concrete floor slab.
How big can a floating concrete slab be?
no matter how big the concrete slab is, it will never float
What are Advantage pre cast concrete slab than insitu concrete?
What are Advantage pre cast concrete slab than insitu concrete?
Why do I still feel cold in a home built on a concrete slab if the inside air temperature is 68 deg?
That's the air temperature at about 5 ft. in the air. The concrete slab is always going to be cold and radiate that cold into the house.
What are slab sewers?
The sewers which are under the concrete slab
Definition of a concrete transfer slab?
what is a ytransfer slab
How many millimeters thick is a concrete slab typically?
A concrete slab's thickness can vary greatly depending on the application. Typically, a concrete slab varies between 500mm to thousands of millimeters.
