<sod>A '''cement accelerator''' is an admixture for the use in [[concrete]], [[Mortar (masonry)|mortar]], rendering or screeds.  The addition of an accelerator speeds the setting time and thus [[Curing (chemistry)|cure time]] starts earlier.<ref name=JUSTNES >Justnes, H. (2000): Accelerator Blends for Portland Cement. Proceedings of Cement and Concrete Technology in the 2000s, September 6–10, 2000, Istanbul, Turkey, Vol. 1, pp. 433-442</ref> This allows concrete to be placed in winter with reduced risk of frost damage.<ref name=KORHONEN >Korhonen, C.J., Cortez, E.R. and Durning, T.A. (1997): Antifreeze Admixtures for Concrete. Special Report 97-26. Cold Regions Research & Engineering Laboratory, US Army Corps of Engineers</ref><ref name=ACI>ACI 306R-88: Cold Weather Concreting. http://www.ccagc.org/pdfs/ACI_306R-88_Cold_Weather_Concreting.pdf</ref><eod>
<sod>A '''cement accelerator''' is an admixture for the use in [[concrete]], [[Mortar (masonry)|mortar]], rendering or screeds.  The addition of an accelerator speeds the setting time and thus [[Curing (chemistry)|cure time]] starts earlier.<ref name=JUSTNES >Justnes, H. (2000): Accelerator Blends for Portland Cement. Proceedings of Cement and Concrete Technology in the 2000s, September 6–10, 2000, Istanbul, Turkey, Vol. 1, pp. 433-442</ref> This allows concrete to be placed in winter with reduced risk of frost damage.<ref name=ACI>ACI 306R-88: Cold Weather Concreting. http://www.ccagc.org/pdfs/ACI_306R-88_Cold_Weather_Concreting.pdf</ref> Concrete is damaged if it does not reach a strength of {{convert|500|psi|MPa}} before freezing.<ref name=KORHONEN>{{Citation |last=Korhonen |first=Charles J. |last2=Cortez |first2=Edel R. |last3=Durning |first3=Timothy A. |institution=[[Cold Regions Research and Engineering Laboratory]] |year=1997 |title=Antifreeze Admixtures for Concrete |work=Special Report 97-26 |isbn=9781428913158}}</ref>{{rp|19}}<eod>