Flow Concrete Mix Design

The main body of the guidelines focuses on the process of reviewing the mix design.
Flow concrete mix design. Sieve analyses of fine and coarse aggregates. Concrete mix designs are submitted for review so that the reviewer can verify the contractor is interpreting the construction documents correctly. Cement water coarse aggregates fine aggregates i e. Additional elements such as pozzolanic materials and chemical admixtures can also be incorporated into the mix to give it certain desirable properties.
Flowable fill mixtures are usually comprised of combinations of cement water fine aggregate and fly ash or slag. Gcp applied technologies has introduced a new line of admixtures concera that produce segregation resistant high slump flow concrete using conventional mix designs. Due to the nature of the product many materials that do not meet the quality standards for use in concrete have been used successfully in flowable fill mixtures. These guidelines were developed to assist the engineer reviewing concrete mix designs.
While a concrete mix design is a process of selecting ingredients for a concrete mixture and deciding on their proportions. The marshall stability and flow test provides the performance prediction measure for the marshall mix design method. Using these admixtures allows for good slump flow without having to use high doses of superplasticizers. Bulk specific gravities and absorptions or moisture content of aggregates.
Before starting concrete mix design basic information on raw materials shall be prepared which include. Clean the dust or other gritty material on flow table and sprinkle a hand of water on it. This mixture is capable of filling all voids in irregular excavations and hard to reach places such as under undercuts of existing slabs is self leveling and hardens in a matter of a few hours without the need for compaction in layers. Mix design procedures aci mix design relationship between water cement ratio and compressive strength of concrete 28 day compressive non ae ae strength psi 2 000 0 82 0 74 3 000 0 68 0 59 4 000 0 57 0 48 5 000 0 48 0 40 6 000 0 41 0 32 7 000 0 33 mix design procedures aci mix design 6.
Prepare concrete as per mix design and place the flow table on a horizontal surface. Unit weight dry rodded density of coarse aggregate. Now place the metal cone at the middle portion of the flow table and stand on it. A concrete mix is a combination of five major elements in various proportions.
Calculation of cement content once the water.