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A gypsum retarder is a substance that slows down the setting time of cement and plaster mixtures. When gypsum is added to these materials, it alters the hydration process, allowing for a more extended working time. This is particularly beneficial in construction projects where precision and timing are crucial. The retarding effect of gypsum is primarily due to its ability to form a gel-like structure when mixed with water, which delays the crystallization of calcium silicate hydrates, the primary compounds responsible for the hardening of cement.

Understanding HMEC A Gateway to Enhanced Learning and Collaboration

As a modified cellulose, HPMC has excellent thickening, bonding and water retention properties. When added to mortar, it can significantly improve the operability of the mortar, extend the construction time, reduce vertical slippage, and provide better working conditions for construction workers. In addition, the use of HPMC can effectively reduce the evaporation of water during the construction process of the mortar and improve the strength and durability of the mortar.