Assertion: citric acid | /r/HasProperty | a retarder additive
Facets:
Source sentences:
text: The role of citric acid, a retarder additive used to prolong the workability and setting time of gypsum binders, was studied at concentrations of 0, 125, 250, 500, 1000, 1500 and 3000 ppm with a constant water/binder ratio.