Concrete is a highly porous material, so it will absorb any moisture it comes into contact with. Without crushed stone, water can settle underneath and erode the slab. Adding a layer of crushed stone will provide proper drainage and create a barrier between the slab and the ground. It is possible to pour concrete on earth, but it must be done correctly. If the soil is very compact, such as solid clay, it may be strong enough to support a slab for some time.
However, it is still important to follow a specific process when pouring concrete on the ground. Let's take a closer look at the steps involved. Whether you are pouring concrete for a walkway or patio, a strong gravel base is essential to prevent cracking and movement. Gravel is especially important in clay soils because it does not drain well, leading to water accumulation under the slab and eventual erosion of the soil. Gravel allows water to drain into the ground below, but if it is too tight, it won't move beneath the concrete. A manual compactor can be used to pack gravel, but a plate compactor makes the job much easier, especially when preparing a large area.
Stone is necessary when dealing with basement conditions and especially if you are close to the water table. It provides an outlet for water to flow into the drainage system instead of the basement. No, you cannot make concrete with just sand and cement. Concrete is not considered concrete without aggregates such as gravel and stone. It is these aggregates that give concrete its strength.
No, you cannot make concrete without gravel. The mixture of 1 part cement, 2 parts sand and 3 parts gravel (stone) is what makes up concrete. Without gravel, concrete would not be strong enough to support heavy loads or act as a base. Do you need gravel under concrete? Whether you are pouring concrete for a walkway or patio, a strong gravel base is essential to prevent cracking and movement. Gravel is especially important in clay soils because it does not drain well, leading to water accumulation under the slab and eventual erosion of the soil. Gravel adds strength to concrete, but if used too much it can have an adverse effect and damage the integrity of the mix.
If you are new to working with concrete, you may not be sure of all the materials needed. Another type of durable concrete is prestressed concrete which is used in heavy-load projects such as bridges and overpasses. It has the advantage of providing aeration in concrete and can be used to create lightweight concrete. We will also briefly review the process of making a concrete slab and some cases in which it might be appropriate to pour concrete directly onto bare earth. Whether you are pouring concrete countertops or a patio in your backyard, it may be cheaper to do it yourself than hire someone.
Yes, you need to put a vapor barrier under the slabs to prevent moisture from penetrating the slab and surface of the patio or house entrance. If the weight of the concrete deforms the ground base in any way, there will be defects in the entire structure. If the cone or cup retains between 50% and 75% of its original shape after being filled with concrete, that indicates good texture and that the concrete should be usable (source).Technically speaking, it cannot be called gravel-free concrete but technology has shown that there are several substitutes that can be used instead of traditional gravel-free concrete. How much money you save depends largely on how much concrete you need and how much time you have available for your project. With some additional considerations for climate conditions, it is possible to pour a concrete base even in winter.