Understanding Design Mix for Class 15,20,25,30 concrete in Kenya

Many people go online asking how much does a 3 Bedroom house cost to build in Kenya, some ask How much does a 4 Bedroom house cost to build in Kenya or even How much does a 2 Bedroom house cost to build in Kenya. While this is not bad, there are some critical aspects of building which they refer bother to ask.

One such thing they hardly ask is about the concrete for foundation. Most construction work start on a wrong foundation because of the poorly done concrete not firm enough to hold the building.

Mix ratios / Mix designs are the ratios that give the amount of materials, ie. Cement, smooth aggregate (Sand), and Coarse aggregate (Ballast). The design mix varies from one class to the next.

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Concrete class/ concrete grade is an indication of the strength that a concrete attains after maturity. In most cases the strength is measured at 28 days since concrete usually achieves around 99% of its strength by this time despite the type of concrete mix.

Concrete mix/grades are measured by conducting compressive tests on cubes of 150mm by 150mm by 150mm that have been curing for 28 days for optimum strength. The C in Kenya is commonly taken to denote class. The ratios represent Cement: Smooth aggregate: Coarse aggregate
Here are the common mix ratios for Kenyan design Mixes.

So much as you wish to know the answer to the question of how much does a 3 Bedroom house cost to build in Kenya or how much does a 4 Bedroom house cost to build in Kenya or like others who ask how much does a 5 Bedroom house cost to build in Kenya, it’s important to understand what will make your house durable and that is the concrete which holds your house.

Note that the ratio of water to cement is usually generally 1:1

Various concrete classes have different uses. In Kenya, these are the common uses:
C15 – Not considered structural concrete, used mostly for blinding.
C20 – General concrete uses, eg slabs, that do not carry a lot of load
C25 – C35 – Most commonly used structural concrete, for slabs, columns and beams.
C40 – Onwards, used for structures that require very high compressive strength, eg, Bridges, columns, concrete roads etc.

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The advantage of having this idea is to enable you question or comprehend the quantity of sand, ballast and cement in your bill of quantity. If you have the area of a house and you should also have idea of how concrete for the foundation will be done or should be done. Looking to build a house, talk to us. We have the answer to the question how much does a 3 Bedroom house cost to build in Kenya or how much does a 4 Bedroom house cost to build in Kenya or like others who ask how much does a 5 Bedroom house cost to build in Kenya. Talk to us today.

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If you are looking a house designs in Kenya or a construction company in Kenya for your next project, think Marble Engineering and Construction Ltd.
We are a Design and Build Construction Company in Kenya with over 25 years of experience in active building construction in Kenya. We mainly do house plans, project planning, building construction, renovations and extensions, institutional building, commercial office blocks and plumbing and drainage services.

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1 thought on “Understanding Design Mix for Class 15,20,25,30 concrete in Kenya

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