An admixture is the action of admixing, mixing in to something.
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Admixture is defined as a material other than cement, water and aggregate that is used as an ingredient of concrete and is added to the batch immediately before or during mixing.
That depends on exactly what use that particular concrete mix is for.
Mineral admixture are those which are mixed with concrete ingredients and spread through out the body of concrete to favourably modify the properties of concrete . the commonly used mineral admixture are1. Fly ash2. Silica fume3. Rice Husk ash4. matakaoline
Silica flour and Silica sand our admixtures to Portland cements.
Required slump for pump concrete is 100 -200 mm is suitable with used of admixture