##tihuan2##In this study, experiments were performed on the applicability of mortars and concretes based on calcium sulfoaluminate (CSA) binders to facilitate the early strength development of ordinary …
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##tihuan2##j mater res technol. 2018;7(2):190–197 191 its use in replacing natural gypsum as cement retarder is limited, mainly due to the variation of moisture and impu-rities
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##tihuan2##Gypsum, which is used for retarding the setting of cement is obtained from the mines at Ghaba in Wilayat Adam. Three Kilns and Four Cement grinding mills allow flexibility to produce various types of cement.
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##tihuan2##Chandara C, Azizli KAM, Ahmad ZA, Sakai E (2009) Use of waste gypsum to replace natural gypsum as set retarders in Portland cement. Waste manag 29(5):1675–1679. Article Google Scholar Hansen S, Sadeghian P (2020) Recycled gypsum powder from waste drywalls combined with fly ash for partial cement replacement in …
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##tihuan2##Oman Cement Company (OCC) was established in the year 1978 as part of the renaissance initiated by His Majesty Sultan Qaboos bin Said. Cement plant with a clinker capacity of 600,000 MTS per annum was commissioned in 1983 and subsequently due to increase demand for the cement in the region, plant capacity was expanded to 1.2 …
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##tihuan2##ABSTRACT: This study deals with the retardation of cement setting time and workability in hot weather such as in Sultanate of Oman. Combination of sugar and gypsum was used …
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##tihuan2##portland cement (OPC). Without gypsum, ground clinker exhibits flash setting in a few minutes, due to the rapid hydration of ... is where the role of gypsum is evident as retarder.
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##tihuan2##Introduction. The setting behaviour of cement is mainly due to the reaction of tricalcium aluminate (C 3 A), 3CaO · Al 2 O 3.The reaction of pure C 3 A with water leads to immediate stiffening of the paste, known as flash set. Thus, gypsum is added to the cement clinker during the grinding of Portland cement to retard the rapid reaction …
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##tihuan2##Combination of sugar and gypsum was used as retarders. The aim of this study was to investigate the effect of retarders on consistency, setting time of ordinary Portland cement (OPC) paste and ...
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##tihuan2##Ozkul Hulusi M., Utilization of citro—and desulphogypsum as set retarders in Portland cement, Cement and Concrete Research, vol. 30, 1755–1758, 2000. ... Alternative calcium sulfate bearing materials as cement retarders. Part II: FGD gypsum, Cement and Concrete Research, vol 34 (11), 2119–2125, 2004. Article Google Scholar
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##tihuan2##The function of Gypsum in Cement: Gypsum is added to cement for various reasons, including: Retarder: As mentioned earlier, gypsum acts as a retarder in cement, slowing down the setting time and allowing for more time to work with the material. This makes it easier for construction workers to handle and mold the cement into the …
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##tihuan2##The cement considered for this study is type GU Portland cement (CRH, Canada Group, ON, Canada). Fly ash used in the concrete was provided by local sources (Ocean Contractor Ltd, Dartmouth, NS, Canada). ... Ahmad ZA, Sakai E (2009) Use of waste gypsum to replace natural gypsum as set retarders in Portland cement. Waste …
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##tihuan2##Sultanate of Oman. Combination of sugar and gypsum was used as retarders. The aim of this study was to investigate the effect of retarders on consistency, setting time of ordinary Portland cement (OPC) paste and compressive strength of concrete cubes after 7 …
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##tihuan2##cement retarder instead of natural gypsum (NG). Cement is the most massive man-made material, 0.04–0.08 ton of gypsum is needed to produce 1 ton of cement, and there were around 1.5 billion tons of cement produced in China in 2008. If PG had been substituted for the NG as cement retarder, 75 million tons of PG should have been reused
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##tihuan2##The U.S. Department of Energy's Office of Scientific and Technical Information
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##tihuan2##The previous research on gypsum retarders mainly focused on small molecule retarders, and there were a few studies on macro retarders for different retarding mechanism, the researches of macromolecular retarder on the hydration process of building gypsum, ... White Portland cement(AR, Tianjin Kemiou Chemical Reagent …
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##tihuan2##Cement and concrete are the most crucial and dominating engineering materials in the construction sector. Cement serves as an excellent binder for concrete and when it is treated under unusual conditions either to satisfy accelerating or retarding requirements by the construction industries, admixtures role comes into the effect. The construction …
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##tihuan2##Flue gas desulfurization (FGD) gypsum was evaluated as a setting time retarder to replace the natural gypsum in the production of Portland cement (CP II E-32).
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##tihuan2##The P.O42.5 Portland cement is selected according to the actual situation on site.The three commonly used retardants are hydroxy-carboxylic acid retarder citric acid (C 6 H 8 O 7 ·H 2 O), sugar ...
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##tihuan2##DOI: 10.1016/j.wasman.2008.11.014 Corpus ID: 10273888; Use of waste gypsum to replace natural gypsum as set retarders in portland cement. @article{Chandara2009UseOW, title={Use of waste gypsum to replace natural gypsum as set retarders in portland cement.}, author={Chea Chandara and Khairun Azizi …
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##tihuan2##The theoretical analysis and the studies on the feasibility on the basis of a series of experiments utilizing manganese slag as retarder in stead of gypsum in cement manufacture were carried out.The results indicated that the indexes including setting time,soundness and radioactivity of portland cement measure up to the national …
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##tihuan2##This study deals with the retardation of cement setting time and workability in hot weather such as in Sultanate of Oman. Combination of sugar and gypsum was used as retarders. The aim of this study was to investigate the effect of retarders on consistency, setting time of ordinary Portland cement (OPC) paste and compressive …
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##tihuan2##This article reports on a study of the displacement of natural gypsum (CaSO4-2H2O) in cement with an alternative setting retarder, such as the industrial by-product derived from flue gas desulfurization process called FGD gypsum. ... Flue gases; Gypsum; Hydration; Portland cement; Retarders (Concrete); Setting (Concrete) Subject Areas: Highways ...
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##tihuan2##The theoretical analysis and the studies on the feasibility on the basis of a series of experiments utilizing manganese slag as retarder in stead of gypsum in cement manufacture were carried out.
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##tihuan2##In the building materials, the industrial byproduct gypsum is mainly used in the production of cement retarders, gypsum slats, gypsum bricks, gypsum blocks, etc. In recent years, new gypsum products, such as self-leveling gypsum, α-type high-strength gypsum, ii-type anhydrous gypsum, and calcium sulfate whiskers, have also been …
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##tihuan2##Gypsum, which is used for retarding the setting of cement is obtained from the mines at Ghaba in Wilayat Adam. Three Kilns and Four Cement grinding mills allow flexibility to …
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##tihuan2##In this study, usability of weathered phosphogypsum (PG) from residue areas as set retarder in Portland cement was investigated. The effects on the setting and mechanical properties of PG added in ...
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##tihuan2##Gypsum plays a very important role in controlling the rate of hardening of the cement, so its is generally termed as retarding agent of cement. It is mainly used for regulating the setting time of cement and is an …
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##tihuan2##SEM pictures of solidified phosphogypsums. a Microstructure of SG-1 (91000). b Microstructure of SG-2 (93000). c The fly ash in SG2 at 3 days (95000). d The fly ash in the SG-2 at 28 days (95000)
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