Flow Concrete Mix Design

Calculation of cement content once the water.

Flow concrete mix design.

The stability portion of the test measures the maximum load supported by the test specimen at a loading rate of 50 8 mm minute 2 inches minute. 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. 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. Flowable fill mixtures are usually comprised of combinations of cement water fine aggregate and fly ash or slag.

Flowable fill concrete is a self compacting cementitious slurry consisting of a mixture of fine aggregate or filler water and cementitious material which is used as a fill or backfill in lieu of compacted soil backfill. Additional elements such as pozzolanic materials and chemical admixtures can also be incorporated into the mix to give it certain desirable properties. Now place the metal cone at the middle portion of the flow table and stand on it. While a concrete mix design is a process of selecting ingredients for a concrete mixture and deciding on their proportions.

Unit weight dry rodded density of coarse aggregate. Before starting concrete mix design basic information on raw materials shall be prepared which include. A concrete mix is a combination of five major elements in various proportions. These guidelines were developed to assist the engineer reviewing concrete mix designs.

The main body of the guidelines focuses on the process of reviewing the mix design. Gcp applied technologies has introduced a new line of admixtures concera that produce segregation resistant high slump flow concrete using conventional mix designs. Cement water coarse aggregates fine aggregates i e. Prepare concrete as per mix design and place the flow table on a horizontal surface.

The marshall stability and flow test provides the performance prediction measure for the marshall mix design method. Clean the dust or other gritty material on flow table and sprinkle a hand of water on it. 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. Bulk specific gravities and absorptions or moisture content of aggregates.

Using these admixtures allows for good slump flow without having to use high doses of superplasticizers.