· This study has examined the effectiveness of characteristically different cement kiln dusts (CKDs) as a partial replacement for the ground granulated blastfurnace slag (GGBFS) in the development
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There are studies on titanium gypsum (TG) as a cement retarder, cementing material, or the production of lightweight wall materials and roadbed materials, but the application of
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The effect of the content of Fe2+ in titanium gypsum on cement properties was studied,and the cement properties and concrete shrinkage with the treated titanium
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Gypsum can delay concrete setting, but only if the process is well monitored and managed; otherwise, too much gypsum could lead to undesirable expansion and an endless delay in a concrete setting. Depending on the cement’s water-cement ratio, cement content, and C3A concentration, the appropriate dosage of retarding admixtures must be determined.
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· Desulfurization gypsum is an industrial by-product, with gypsum dihydrate (CaSO 4 ·2H 2 O) as a main component, produced by the use of limestone-gypsum wet desulfurization of coal-fired flue gas. During wet desulfurization, 1 t of SO 2 produces about 2.7 t of desulfurization gypsum [5] , causing annual emissions of desulfurization
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· Abstract. 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 ratios 1, 3, 5, 7, 10, and 12.5 wt.% to Portland cements were studied and compared with a Portland cement containing natural
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· To this material Portland cement was added to form samples of cement mortar CSG1, CSG2 and CSG3 series (Portland cement–slag powder–FGD gypsum), as shown in Table 2. After determining the optimum temperature and SO 3 content for utilizing gypsum, a Compound-slag was laboratory-produced in which the gypsum was at this
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· Abstract. The present study is focused on clarifying the influence of waste gypsum (WG) in replacing natural gypsum (NG) in the production of ordinary Portland cement (OPC). WG taken from slip casting moulds in a ceramic factory was formed from the hydration of plaster of paris. Clinker and 3–5wt% of WG was ground in a laboratory ball
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· Abstract. The effects of desulfurized gypsum, heat-treated desulfurized gypsum and hydrogen peroxide modified desulfurized gypsum on the setting time of Portland cement were studied. The results showed that when the content of desulfurized gypsum after 80 °C heat treatment was 4% of Portland cement, the initial setting time
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The effects of desulfurized gypsum, heat-treated desulfurized gypsum and hydrogen peroxide modified desulfurized gypsum on the setting time of Portland cement were studied. The results showed that when the content of desulfurized gypsum after 80 °C heat treatment was 4% of Portland cement, the initial setting time was 136min, and the final
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Study on application of titanium gypsum as cement retarder. L. Lei. Published 2006. Materials Science, Engineering. TLDR. The results showed that the water requirement
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· DOI: 10.1016/j.conbuildmat.2022.127630 Corpus ID: 248445855 Modification of phosphogypsum using circulating fluidized bed fly ash and carbide slag for use as cement retarder @article{Li2022ModificationOP, title={Modification of phosphogypsum using
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The results showed that the water requirement for normal consistency and setting time of cement with titanium gypsum cement were similar to those with natural gypsom cement. The effect of the content of Fe2+ in titanium gypsum on cement properties was studied,and the cement properties and concrete shrinkage with the treated titanium
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· Xiao S, Lv S, Ning M, et al. Experimental study on iron-rich titanium gypsum as cement retarder (In Chinese). Chin Concr Cem Products. 2016; 82–87. Chandara C, Azizli KAM, Ahmad ZA, et al. Use of waste gypsum to replace natural gypsum as set retarders in portland cement.
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Demand for cement in China exceeded 1.2 billion tons in 2010, which results in the increase of the demand for natural gypsum [4−6]. To exploit and use fluorgypsum as a substitute for natural gypsum reasonably and efficiently can not only save the resources of
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· Abstract. There are studies on titanium gypsum (TG) as a cement retarder, cementing material, or the production of lightweight wall materials and roadbed materials, but the application of TG is still limited, the utilization of TG is in the stage of
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· 2.1 Test MatrixFive 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
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· 1. Introduction Gypsum, one of the most important cementitious materials, has been widely utilized for the construction of civil engineering, assistance in bone regeneration, retardation on cement, soil amendment, processing of building materials with
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· Abstract. The effects of eight retarders, including tartaric acid, sodium tartrate, salicylic acid, melamine, sucrose, white cement, sodium triphosphate, and citric acid, on setting times and strength of building gypsum were investigated under different dosage. The retarding mechanism of that was analyzed by scanning electron microscope
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· One of the most important uses of natural gypsum is the manufacture of ordinary Portland cement (OPC), which is included in amounts of 2.5-5%, acting as an OPC setting time retarder [42, 43].
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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. Firstly, it
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· Portland cement is the most important material in the building industry. This material is produced by adding about 3–5% gypsum (CaSO4 ·2H 2O) to clinker as a set retarder. The aim of this study was to stabilize borogypsum, and to produce cements by adding borogypsum instead of natural gypsum to clinker. Concrete using cement
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Study on the feasibility that titanium gypsum play the role of cement retarder instead of natural plaster,based on effects that titanium gypsum incorporation,slag
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The chemical composition and mineral structure of fluorgypsum as well as its harm to application in cement were elaborately analyzed. The primary fluorgypsum was modified and its applications in cement’s production were studied. The technological flow chart of preparing modified fluorgypsum was given. Experimental results indicate that hydration
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· Abstract. This paper describes replacing natural gypsum with FGD gypsum as cement retarder, the influence on the working performance, compressive strength and admixture adaptability of concretes
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Abstract. In this study, by adding a small amount of calcined desulfurization gypsum and aluminate cement into slag powder cement, the effects of calcined desulfurization gypsum and aluminate
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The effects of modified phosphogypsum, undisturbed phosphogypsum, and natural gypsum on the properties of Portland cement were comparatively studied. The modification mechanism of carbide slag and CFB fly ash on phosphogypsum and the mechanism of influence of the modified phosphogypsum on the hydration characteristics of Portland
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· 2.1 Test MatrixFive 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
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· The effects of modified PG, natural gypsum, and PG as Portland cement retarders on the cement properties were compared and analyzed by XRD, SEM, and hydration heat analyses. Results indicated an optimal sulfuric acid concentration of 30% H 2 SO 4 during the first crystal transformation and a liquid-to-solid ratio of 7:1 during the
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· Cement clinker minerals, mineral powder, and active calcium aluminate were dissolved in water to produce Al(OH) 4− and OH − after water was added to the Portland cement-fly ash-calcined FGD
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