Types of Admixtures of Concrete & Cement | Chemical, ,
Retarding admixtures delay the end of the dormant period and the start of setting and hardening This is useful when used with plasticizers to give workability retention Used on their own, retarders allow later vibration of the concrete to prevent the formation of cold joints between layers of concrete placed with a significant delay between them
natural anhydrite as cement retarder - witneyfmsgorguk
Use of waste gypsum to replace natural gypsum as set retarders in Jan 7, 2009 Use of waste gypsum to replace natural gypsum as set retarders in natural gypsum (NG) in the production of ordinary Portland cement (OPC) >>Chat online! Purification of South African phosphogypsum for use as Portland
Effects of Saccharide Set Retarders on the Hydration of ,
J Am Ceram Soc, 93  279–287 (2010) DOI: 101111/j1551-2916200903378x r 2009 The American Ceramic Society Journal Effects of Saccharide Set Retarders on the Hydration of Ordinary Portland Cement and Pure Tricalcium Silicate Linghong Zhang,z Lionel J J Catalan,w,z Raymond J Balec,y Andrew C Larsen,y Hassan Haji ,
Inﬂuence of heavy metals on the early hydration of ,
nology, ordinary Portland cement (OPC) is widely used as the major binding material However, one of the most dif-ﬁcult problems in this ﬁeld is that the setting and hardening of OPC is relatively slow at early ag Such aspects are extremely signiﬁcant since the heavy metals are strong retarders of OPC hydration [1, 3, 5–8] Therefore .