Requirements of Concrete Design Mix

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Requirements of Concrete Design Mix

Compressive strength of concrete may be varies and it is really depends on the design mix. Modern concrete mix designs can be complex. The choice of a concrete mix depends on the need of the project both in terms of strength and appearance and in relation to local legislation and building codes. The design begins by determining the requirements of the concrete. These requirements take into consideration the weather conditions that the concrete will be exposed to in service, and the required design strength. In short,requirements to be considered for design mix shall be as following ;

1. Characteristic strength of concrete required.

2. Work-ability requirement of concrete.

3. Quality control at site.

4. Weather conditions.

5. Exposure conditions of concrete.

6. Batching and mixing methods.

7. Quality of materials.

8. Special Requirements of concrete.

The compressive strength of a concrete is determined by taking standard molded, standard-cured cylinder samples. Many factors need to be taken into account, from the cost of the various additives and aggregates, to the trade offs between the "slump" for easy mixing and placement and ultimate performance. A mix is then designed using cement (Portland or other cementitious material), coarse and fine aggregates, water and chemical admixtures.

The method of mixing will also be specified, as well as conditions that it may be used in. This allows a user of the concrete to be confident that the structure will perform properly. Various types of concrete have been developed for specialist application and have become known by these names. Concrete mixes can also be designed using software programs. Such software provides the user an opportunity to select their preferred method of mix design and enter the material data to arrive at proper mix designs.