Molasses retarder is a kind of surfactant, which is made from the leftover of sugar making and treated with lime. When mixed into the concrete mixing table, it can adsorb on the surface of cement particles and form a hydrophilic film with the same charge, so that the cement particles repel...
Most of the times, retarding admixtures are added to concrete when it is hot outside. Spraying a retarder on the surface of the formwork stops the matrix from hardening where it meets the formwork. On the other hand, the rest of the concrete gets hard. When building something big or very...
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