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The two other principal technical developments, gypsum addition to control setting and the use of ball mills to grind the clinker, were also introduced at around the start of the 20th century. An entire website could easily be devoted to the history of cement, but ....
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Oct 05, 1999· Without the use of lime, and using 85% to 95% sulphoaluminate cement clinker, 5% to 15% gypsum, and mixing with sand and water at 22° C. with a ratio of 1: (sand): (water), the resultant setting time is 45 to 120 minutes, and the 1 to 2 hour curing strength practically nil, while the 4 hour curing strength is to 2 MPa (Mega Pascals)....
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What is the purpose of adding gypsum in cement? Gypsum is a mineral and is hydrated calcium sulfate in chemical form. Gypsum plays a very important role in controlling the rate of hardening of the cement. During the cement manufacturing process, upon the cooling of clinker, a small amount of gypsum is introduced during the final grinding process....
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Figure 4. Rotary kiln. The major components in clinker are impure but well crystallized fine (ca. <50 µm) crystals of tricalcium silicate and dicalcium silicate. Minor but important crystalline components are extremely fine crystals of tricalcium aluminate and calcium aluminate ferrite solid solution (ferrite)....
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What is the purpose of adding gypsum in cement? Gypsum plays a very important role in controlling the rate of hardening of the cement. During the cement manufacturing process, upon the cooling of clinker, a small amount of gypsum is introduced during the final grinding process. Gypsum is added to control the "setting of cement". price...
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