What Concrete Is Needed For A Strip Foundation

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What Concrete Is Needed For A Strip Foundation
What Concrete Is Needed For A Strip Foundation

Video: What Concrete Is Needed For A Strip Foundation

Video: What Concrete Is Needed For A Strip Foundation
Video: Ben's self build vlog 1 - what is a strip foundation? 2024, March
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In order for the strip foundation to meet all the requirements for it, you need to be able to properly prepare concrete of a suitable grade. For monolithic foundations, this is M-200 (B15).

High quality concrete is required for casting strip foundations
High quality concrete is required for casting strip foundations

Necessary

  • - concrete mixer
  • - sand
  • - cement
  • - gravel or crushed stone
  • - sieve
  • - water

Instructions

Step 1

Strip foundations are the most popular among other types of foundations. This is due to its economy and excellent load-bearing capacity. There are two types of belts: monolithic and prefabricated. For the construction of the former, concrete is required, for the latter, foundation blocks. A properly prepared solution is needed not only for monolithic bases, but also for prefabricated ones, since it is a binder in the laying of blocks. Therefore, the strength and durability of any strip foundation largely depends on the quality of the cement-sand mixture.

Step 2

To make concrete on your own, you need a concrete mixer. Without it, it will be difficult to process such a large volume of solution. The main ingredient of the cement-sand mixture should be cement grade M400 and higher. When buying this material, you need to make sure that its expiration date has not expired. All the strength characteristics of the foundation depend on the quality of this main component of concrete.

Step 3

According to GOST 10178-85, the shelf life of Portland cement and slag Portland cement, subject to the rules of its transportation and storage, is 45 days for quick-hardening compositions, 60 days for other types of cement, and when delivered in bulk - no more than 45 days. The buyer should be aware that for a month of storage, cement loses up to 10% of its activity. For this reason, after 6 months from the date of its production, the M400 brand turns into M300.

Step 4

To prepare concrete for a monolithic strip foundation, you will need sand and gravel (crushed stone). The first should be of medium grit and quarried. Before putting it into a concrete mixer, it must be sieved through a sieve (grate) with a mesh of 5-10 mm. The concrete filler is gravel or crushed stone. These stones must be of a medium fraction, that is, their maximum size can be 20/40 mm.

Step 5

In order for the concrete for the strip foundation to correspond to the most acceptable grade M-200 (B15) for it, the following laying criterion must be adhered to: 1 kg of cement will require 2.8 kg of sand and 4.8 kg of gravel or crushed stone. To prepare concrete M200 from cement grade M500, you will need to observe the following proportions: for 1 kg of cement, you need to take 3.5 kg of sand and 5.6 kg of aggregate. It is according to these rules that the M-200 (B15) mortar is manufactured at the factory.

Step 6

For an individual developer, it is difficult to maintain the parameters corresponding to the production process. Therefore, when preparing concrete on your own, experts recommend adhering to this rule: for 1 part of cement, you need to take 3 parts of sand. The amount of aggregate should not exceed 40% of the total volume of the mixture. Water is added to the concrete mixer gradually, achieving a pasty consistency of the solution.

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