Benefits of Concrete Trial Mix Procedure at Construction Site
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A concrete mix means a combination of five most important components in different ratios of cement, water, coarse aggregates, fine aggregates (i.e. sand), and air.
Supplementary components like pozzolanic materials and chemical admixtures are also integrated into the mix to retain specific desirable properties. A concrete mix design refers to a method of choosing constituents for a concrete mixture and deciding on their proportions. While designing a mix, consideration should be given on the desired strength, durability, and workability of the concrete for the project in question.
The perfect proportions of these constituents should be maintained to optimize their concrete mixes and retain concrete strength, durability, workability, and other desirable properties. In this way, the lowest cost of the concrete as well as highest strength of the mixture can be maintained.
The concrete trial mix procedure allows the construction professionals to examine the strength, workability, compactness and other properties of concrete mixes. Trial mixes play an important role while using new materials or admixtures. Trials are also useful while setting up batch data.
The estimated mix proportions should be examined through trial batches.
The quantity of material should be adequate for minimum three 150 mm size cube concrete samples.
When trial mix is necessary, the Number of laboratory or site mixed batched should be mentioned or agreed among the purchaser and producer with the materials which should be used for the work.
The workability of each trial batches should remain same as the proposed supply inside the tolerance provided in 3.5 (Max free water/cement ratio) of BS5328 Part 4. THREE cubes should be created for each batch for test at 28days.
Also Read: Classification of Concrete Mix Design
The average compressive strength of the three cubes tested at 28 days should surpass the specified characteristic strength by minimum 10N/mm².”
The concrete trial mix design is prepared to analyze either the design mix would be implemented according to assumptions. When there is appreciable variation, accessible alternatives are :-
Directly apply the trial mix ratios at the site. Rectify the trial mix ratios depending on the intuition and apply the modified ratios at the site.
Produce further trial mixes integrating changes in the ratio on the basis of the feedback obtained from the previous mix.
To get more details, go through the following video tutorial.
Video Source: Tutorials Tips
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