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Home Construction Basics The Principles of Concrete Mixing
Home Construction Basics The Principles of Concrete Mixing
| The Principles of Concrete Mixing |
| Saturday, 12 April 2008 07:52 | ||||||
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1. Workability of concrete 2. Strength 3. Durability 4. Economy The proportion that will be finally adopted in concrete mixing has to be established by actual trial and adjustments process in order to attain the desired strength of concrete required. The process would be as follows: 1. The water cement ratio is first determined at the first hour of mixing to meet the requirements of strength and durability. 2. The aggregate cement ratio is then chosen and established to satisfy the workability requirements. Laboratory test results showed that the water-cement content ratio is the most important consideration in mixing because it influences not only the strength and durability of the concrete but also the workability of fresh concrete being poured inside the forms. Concrete mixture which are in paste form is preferred than those that are flowing in water. The ACI requirements for concrete are enumerated as follows: 1. Fresh concrete shall be workable. Meaning, that fresh concrete could flow freely around the reinforcements and fill all the voids inside the form. 2. That, the hardened concrete shall be strong enough to carry the design load. 3. That, hardened concrete could withstand the conditions to which it is expected to perform. 4. the concrete should be economically produced. Concrete mixture may be classified as either: a. Designed Mixture – where the contractor is responsible in selecting the mixture proportion to achieve the required strength and workability. b. Prescribed Mixture – where the designing engineer specify the mixture proportion. The contractors responsibility is only to provide a properly mixed concrete containing the right proportions as prescribed.
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