Quality control of concrete mixtures

One checks vital for concrete work is to test concrete materials. For years we had only mixed concrete requirements for ultimate strength. If only such a requirement is not enough because there are many other features are used in the construction process have not been fully included.

When selecting concrete mixture used for projects with 4 options as follows:

Mixed by design:

The mixture is regulated by ensuring product requirements form of intensity level, the special requirements of the material, cement content and minimum maximum ratio of water/ cement and a minimum free some other requirements.

The experiments helped design strength concrete mix ingredients .

Mixed order:

The mixture was regulated material composition and properties of the component materials to produce concrete meeting the requirements. The proportion of mixed data before forming an essential part of the requirements to meet. Strength testing of the materials used does not meet the requirements.

Mixed standards:

The mixture was pre- selected in the spreadsheet of State Standards. Experimental intensity data is not used to meet the requirements.

Mixed specify:

Buyers must specify concrete structures using concrete as mass concrete, concrete with or without reinforcement, concrete structure used for pre-stressed, …

The specified size must be clearly stated on the list of materials.

The buyer must specify workability of concrete , methods of construction and finishing methods on concrete.

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When preparing to make concrete , concrete makers need to know the parameters that consulting engineers to ensure quality requirements:

* Compressive strength sample request

* Slump concrete advantages for the

* Curing time and end time setting

* The requirements of environmental erosion control

* The aggregate requirements of lithological composition, chemical composition, concentration of chlorine, alkali …

* The cement requirements such as type, grade, additives, storage duration, maximum concentration and minimal color.

* The water requirements and water rate / maximum cement

* The requirements for additives or decreased activation

* Other requirements such as hypothermia, shrinkage, waterproof …

* The requirements for materials testing  certification of materials used

When you need to experiment before deciding mixed concrete components.

Manufacturing finished mixing concrete or concrete products to the construction of the consulting engineers need to ensure quality:

  • Observation by eye- color, consistency of concrete, a preliminary assessment of aggregates.
  • Ask the provider to try slump concrete before concrete is put to use where.
  • Model Casting for quality inspection. For every 50m3 of concrete to obtain a sample group. Label to attach to just cast form. Labels should record the date, time providing concrete , textured concrete should have used this sampling , which provides code provided .

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