The base course material according to aci 302 concrete floor and slab construction should be compactible easy to trim granular fill that will remain stable and support construction traffic aci 302 recommends material with 10 to 30 fines passing the no.
Gravel base under concrete driveway.
Concrete for a 15 foot square slab how to lay a gravel shed foundation water leak under a concrete slab building a greenhouse foundation gravel vs concrete shed base which is concrete for a 15 foot square slab.
The recommended gravel base for a concrete driveway.
A concrete driveway must be installed on solid stable soil otherwise it will eventually fail reducing the life span.
The soil should be graded or sloped so the excavation site s center is.
The strength and durability of a concrete driveway are not only determined by the type of concrete mix but also by base or sub base over which.
This layer is made up of large crushed stone aggregate that will provide structural strength and integrity to your driveway.
100 sieve with no clay silt or organic materials.
The base is a layer that also consists of crushed stone but slightly smaller stones than the sub base in some cases stone.
What type of gravel under concrete slab.
Each 50 pound bag of quikrete all purpose gravel yields approximately 0 5 cubic feet of gravel.
The sub base is the bottom layer of crushed stone that will sit on top of the subgrade.
It is definitely not a proper base for a driveway it is too mobile has low bearing capacity moves about under load especially if very dry or very wet and will cause structural cracking of your driveway.
Excavating and adding base material or any other type of structural base to unstable sub grade can stabilize the soil and in turn will lengthen the life expectancy of the concrete driveway.
Sand is a proper levelling course for use under pavers and ungrouted brick patios and such.
Excavate the soil to a depth of 8 inches allowing 4 inches for the gravel base and 4 inches for the concrete slab.