Is the ability of masonry cement to last longer in the workability phase, mainly due to the addition of gypsum during production, in quantities lower than that added to the cement used for reinforced concrete?
It is best to experiment with your own laboratory according to the type of cement used and the proportions you would like to test
Please read: "Dual role of gypsum: set retarder and strength accelerator" by N. Bhanumathidas and N. Kalidas. March 2004. Indian Concrete Journal 78(3): 170-173.
It is best to experiment with your own laboratory according to the type of cement used and the proportions you would like to test
dear
please see this
http://fal-g.com/nattach/files/Dual%20role%20of%20Gypsum.pdf
In my expierience in concrete ready mix production, it apparently does so. But not only in the amount of gypsum added but also for the mineralogy of it. Gypsum is the component of the cement that control the reactión of the C3S, wich is knonw for its rapid reaction and great heat liberation, so if the amount and caracteristics of gypsum do not control properly the reaction of the C3A, there will be a fast setting of cement and could decrease rapidly the concrete workabilty.
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