Gypsum As An Additive To Cement
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- Gypsum As An Additive To Cement
A soft marine clay at two initial water contents (i.e. 50% and 70%) was treated by reconstituted cementitious binders with varying gypsum to clinker (G/C) ratios and …
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However the results of this study showed that the gypsum is a good additive for improvement of the swelling clays, contamination of the groundwater by the gypsum should also be considered, as well as the use of sulfate …
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Improved geopolymerization of bottom ash by incorporating fly ash and using waste gypsum as additive. Author links open overlay panel Kornkanok Boonserm a, Vanchai Sata a, Kedsarin Pimraksa b, Prinya Chindaprasirt a. Show more. Add to Mendeley. ... FA is a good pozzolan and is widely used to replace Portland cement to …
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Additives such as lime, cement, fly-ash, and gypsum are frequently utilized to enhance the engineering performance of bentonite [4]. However, processing the materials release byproduct like CO2 ...
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The main purpose of adding gypsum in the cement is to slow down the hydration process of cement once it is mixed with water. The process …
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This paper presents an experimental work on the compressive strength of earth bricks in particular the influence of additives. In total 21 different test series are carried out with different composition of earth, cement, gypsum, hemp and flax fibers.
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The aim of this research is to study the technical feasibility for the use of FGD gypsum in partial or total substitution of natural gypsum as retarder additive of the Portland cement. Three stages were considered to achieve this goal.
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This demonstrates that gypsum, an industrial waste but used here as a special additive, is more effective in increasing the strength of soft clays with relatively higher initial water contents, primarily because the higher porosity in the soft clays with higher water contents can accommodate the growth and volumetric expansion of …
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Mineral additives are divided into three types: active components, crystallization centers and inert fillers [17], [18], [19], [20].In accordance with modern concepts of the hardening mechanism of gypsum-cement composite, to ensure its stability and prevent the development of destructive hydrosulfoaluminate corrosion as a result of …
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DOI: 10.1016/j.conbuildmat.2021.124910 Corpus ID: 240532385; Preparation of high-performance building gypsum by calcining FGD gypsum adding CaO as crystal modifier @article{Hao2021PreparationOH, title={Preparation of high-performance building gypsum by calcining FGD gypsum adding CaO as crystal modifier}, author={ng Hao and …
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PDF | On Jan 1, 2017, Natalia Vasilyevna Chernysheva and others published Effective Composites Employing Fast-Hardening Gypsum Cement Binders for Additive Manufacturing | Find, read and cite all ...
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Gypsum cements possess considerably greater strength and hardness as compared to non-gypsum cement. Water required in gypsum based cement for the hydration process is less. The use of gypsum as an additive in cement ranges from 2.5 to 5 per cent. In its natural form, gypsum can be found as thick layers in shale and as …
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Gypsum is one of the additive raw materials added to the clinker grinding process that regulate the binding time of cement or commonly known as a retarder. This research aims to observe the effect of gypsum added variation on the compressive strength of mortar and the whole quality of Portland Composite Cement at plant 14 P.T Indocement Tunggal …
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The paper presents an assessment of the impact of using additives on the strength of a binding material, i.e., building gypsum, and also the phase transformation that takes place in it. Microspheres, aerogel and polymer (HEMC) additives were added to a building gypsum slurry with a water to gypsum ratio of 0.75. In order to investigate their …
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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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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). The results of physical-chemistry and morphological characterization of both products showed a material of high purity, calcium sulfate dehydrate for natural gypsum, and higher ...
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Gypsum is one of the additive raw materials added to the clinker grinding process that regulate the binding time of cement or commonly known as a retarder. This research aims to observe the effect of gypsum added variation on the compressive strength of mortar and the whole quality of Portland Composite Cement at plant 14 P.T …
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The presented research suggests that the novel application of recycled gypsum in concrete is achievable from a structural perspective, and including fly ash is essential. ... review of the use of synthetic textile and cardboard waste fibres in concrete in conjunction with infrequently used additives such as gypsum, metakaolin, alumina and …
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The adaptability of different concrete plasticizers and gypsum-slag admixtures as an additive with controlled SO 3 content in concrete was explored by Guo et al., [137]. FGDG thermally treated at 200 °C with an optimum 3.5 % SO 3 content demonstrated the highest compressive and flexural strengths.
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2.1 Test Matrix. Five total mix designs are considered for this study including one control batch, two batches that involve fine gypsum as a partial replacement for cement in different amounts (20 and 10%), and two batches that involve the whole gypsum as partial replacements for 10 and 20% of cement in the concrete.
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It is known that the use of various fibers, both in cement and in the gypsum matrix, helps to reduce shrinkage cracks by 50–90% [31,32]. Obviously, the fiber content in the gypsum-cement fiber-reinforced composite (GCFRC) will increase its frost resistance and durability characteristics to the level of composites with air-entraining additives.
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The results indicate that the presence of cement as an additive could eliminate the weak points of construction gypsum without any negative side effect. The study was supported by aging ...
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Several studies have investigated the effects of gypsum as an additive on the UCS of different soils (Yilmaz and Civelekoglu, 2009; ... Popp et al. (2021) revealed that mixing gypsum with additives like lime and cement could reduce the leaching of impurities from gypsum in the soil to safe levels through immobilization and pH increase.
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This paper deals with the performance of the gypsum as an additive for treatment of the expansive clay soils by means of swell potential and strength. Optimum …
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Additionally, it serves as a Portland cement additive that inhibits concrete from setting too quickly. Other uses of Gypsum. It has a number of manufacturing, industrial, and agricultural applications. ... Comparing gypsum cement to non-gypsum cement reveals that gypsum cement has significantly higher strength and hardness.
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Technical feasibility for use of FGD gypsum as an additive setting time retarder for Portland cement. Caillahua M; Moura F; Journal of Materials Research and Technology. DOI: ... (FGD) gypsum was evaluated as a setting time retarder to replace the natural gypsum in the production of Portland cement (CP II E-32). The results of physical ...
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Rapid setting cement or gypsum as well as modern gypsum board mills can present a problem. ... ML 11 is a modified non-ionic, water soluble cellulose ether, intended as a water retaining and consistency improving additive to cement based mortars. Bermocoll® ML 11 contains methyl, ethyl and hydroxyethyl substituents giving a unique balance ...
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Gypsum. Gypsum, chemically known as calcium sulphate dihydrate, is one of the most important minerals used in the production of construction materials. Today, the majority of gypsum binder, so-called calcined gypsum, is used for the manufacture of …
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The literature contains a vast number of stabilizing techniques such as lime, cement, and fly-ash for treatment of expansive clay soils. However the use of gypsum as a stabilizing agent is currently not clear. ... This paper deals with the performance of the gypsum as an additive for treatment of the expansive clay soils by means of swell ...
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One economical, widely implemented ground improvement technique, particularly developed for the treatment of soft, weak, incompetent coastal clayey …
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The additive ingredient present in gypsum is calcium sulfate. Gypsum exists in many forms, such as anhydrous gypsum, dihydrate gypsum, and hemihydrate, with different solubility rates, which are very …
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Some studies have already stated that various types of gypsum residues can be used to delay the setting time of Portland cement, such as phosphogypsum [16,52, 87] and flue gas desulfurization ...
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Gypsum is a calcium sulfate dihydrate which has many applications as a plaster and concrete additive, as well as a soil fertilizer and conditioner.
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Introduction. In the cement industry, gypsum is added into the clinker in order to delay the rapid reaction between C 3 A (3CaO·Al 2 O 3) and water.Conventionally, natural gypsum is used as a retarder, however, in some countries, because of the lack of gypsum deposits or ecological necessities, new sources of gypsum, i.e. by-product …
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GYPSUM Sika Performance Additive Technologies Gypsum boards are manufactured in a highly automated and continuous production line process. The plaster is mixed with water, various additives and prefabricated to form a consistent wet slurry ... of gypsum, cement and other mineral binder system. The Sika Retardan® range
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