CHOOSING THE RIGHT CEMENT FOR THE RIGHT APPLICATION

To build structures that will last, you need the right type of cement. We take a look at the different types of cement and its applications.

The three main strength classes of cement All cement is mainly classified into three strength classes.

  • 32,5
  • 42,5
  • 52,5

This figure is typically accompanied by either an “N” or ”R”, which denotes the period of time it takes for the cement to reach the suitable strength.

  • The N implies that it will have normal strength gain; and
  • The R implies early/rapid strength gain.

This is important to know, as should you for example build a structure that requires rapid setting and hardening, you would use an “R” type of cement that will in other words reach strength at an earlier age.

Cement standards
Questionable materials will produce questionable results. For the South African built environment, it is recommended to use cement that complies with the requirements of South African National Standards (SANS) 50197-1. All the Sephaku Cement products fully conform to the requirements of the strength classes as specified by SANS 50197-1, as well as the National Regulatory Of Compulsory Specifications (NRCS) requirements.

General purpose cement that gains strength at an early stage
The Sephaku 32 is a 32,5N general purpose blended cement that reaches strength at a normal age and that is suitable for general use in:

  • Concrete for home or building structures
  • Mortar, plaster and screed applications.

Sephaku 32 applications
The Sephaku 32 can be blended to achieve low, medium or high strength concrete for a myriad of applications:

  • High strength concrete: At the correct proportions columns, ground slabs and light -duty industrial floors;
  • Medium strength concrete: paths, driveways and light-duty floors;
  • Low strength concrete: foundations, domestic flooring, steps, paths and fencing;
  • General purpose mortar: bricklaying and plastering; and
  • Dry, lean mixes: brick- and block manufacturing.

General purpose cement that has normal strength gain
The Sephaku 42 blue is a highly versatile 42,5N general purpose blended cement that is suitable for a comprehensive repertoire of concrete, mortar and screed application. It can be blended to achieve all the required strengths of concrete for the same applications as the Sephaku 32 mentioned above.
Sephaku 42 blue benefits

  • Suited for a comprehensive range of building and civil work;
  • Used to manufacture concrete products;
  • Appropriate for any domestic concrete use; and
  • It uses less water to achieve a mix that is cohesive and durable.

Early strength cement for fast demoulding and striping of formwork
The Sephaku 42 green is a 42,5R cement that develops strength at an early stage, which makes it most suitable for the following applications:

  • Any type of building and civil work;
  • Instances where fast demoulding, striking or striping of formwork is advantageous;
  • Ready-mix; and
  • Site-batched concrete, mortar and screeds.

This cement also has a significantly reduced water demand which in turn leads to concrete that flows and pumps effortlessly and creates an improved surface finish with enhanced durability.

High performance cement that requires day one strength
The Sephaku 52 is a 52,5N high performance cement that is suitable for civil engineering and structural concrete applications that require day one strength and cold-weather concreting. This includes:

  • High-strength concrete, precasting and ready-mix;
  • Water-tight, structural and pre-stressed concretes; and
  • Precision grouts, repairs and formulated cement products.

It is also ideal for use with cement extenders that enhance the concrete properties such as silica fume and fly ash or slagment.
For a comprehensive guideline on the types of cement and its applications, as well as the mix proportions for the various concrete strengths, click here to download the Sephaku Cement product brochure now.