16.3.1 Effect of Physical Properties of Phosphorus Building Gypsum-Based Lightweight Concrete Materials. Setting Time and Standard Consistency.The gypsum-based material setting time and standard consistency water consumption is an important indicator in measuring the physical properties of the material inspection, which not only affects the …
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The gypsum-based material setting time and standard consistency water consumption is an important indicator in measuring the physical properties of the material …
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The standard consistency of water consumption was 60 %. 2.1.6. Chemical composition. ... In this experiment, cement, fly ash, lime and gypsum power were poured into mixer according to corresponding proportions, 0.1 % citric acid was added, and pre-mixing for 120 s. After that, water was poured in mixer, stir slowly for 60 s, and stir quickly ...
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It is observed that the use of superplasticizer significantly lowers the water requirement of the gypsum plaster for standard consistency from 58% to 40% as the SP content increases from 0 to 1.0 wt%. Besides reducing the consistency of the plaster in the presence of superplasticizer, the ease of application of the mixture is markedly improved ...
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and the gypsum-based material properties such as standard consistency, setting time, mechanical properties, softening coefficient and water absorption, and microstruc-ture were tested and …
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It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Keywords. Cement-portland; Consistency; Hydraulic cement; normal consistency of hydraulic cement, test; ICS Number Code 91.100.10 (Cement. Gypsum. Lime. Mortar)
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To investigate the effects of different water reducers and dosages on the standard consistency of water consumption, water reducing rate, and net slurry fluidity of MPGCM, experiments were conducted. Fig. 6 shows the effects of different water reducers and their respective dosages on the slurry properties of MPGCM samples.
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Because the HPMC content increased, the mortar became sticky, and the consistency did not increase with water consumption. At this time, the mortar consistency was controlled at 80–90 mm. The ambient temperature and relative humidity were controlled at 23 ± …
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From this experiment the suitable percent of water with gypsum was determined, which equals = 42% to produce standard consistence paste, also setting time …
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Another experiment has shown that ... Standard Consistency Water Consumption ... properties of cement mortars made with this waste compared to the traditional use of natural gypsum. ...
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This document describes an experiment to determine the standard consistency of hydraulic cement. The experiment involves mixing cement and water in varying ratios and using a Vicat apparatus to measure the penetration of a plunger into the cement paste after 30 seconds. The standard consistency is defined as the percentage of water that results in a penetration of …
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90 min for gypsum slurry at the standard consistency water consumption. On this basis, different amounts of Na 2 HPO 4 were dissolved in water and while the protein retarder
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Therefore, this paper proposes a method for the preparation of medium-low strength hemihydrate gypsum with multiple utilization options through autoclaving at lower …
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The utility model discloses an intelligent testing device for water consumption of standard cement consistency, which comprises a stirring device, a torsion sensor, a water adding device and a control system; the stirring device, the torque sensor and the water adding device are all connected with the control system, the stirring device is used for stirring cement, the torque …
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The experimental method involved in determining water Determination of the water requirement for standard con-sistency (Hereinafter referred to as standard consistency) of the specimens was conducted based on GB/T 17669.4–1999 "Determination of physical properties of construction gyp-sum slurry" and GB/T 23456–2009 "Phosphogypsum".
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Adding a water reducer can effectively reduce the water consumption of the MPGCM and improve its fluidity. To investigate the effects of different water reducers and dosages on the standard consistency of water consumption, water reducing rate, and net slurry fluidity of MPGCM, experiments were conducted.
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The preparation ratios of sample are shown in Table 3, Q phase in the gypsum slurry increased with a step of 5% and the gypsum slurry was prepared at different water-binder ratios to maintain the standard consistency fluidity at the range of 175–185 mm. Water reducer polycarboxylate superplasticizer agent (PCE) with solid content of 40% was ...
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W at er / Gypsum ( standard consistency). 3. Setting time . 4. ... Standard consistency= (water volume used to get the standard diffusing cm 3 /75 gm of gypsum) ... Experiment Findings.
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Weight of cement = 300 gm, % of water = 26% to 38 % (normal consistency of OPC range between this) Take 26% of water for the test, then the amount of water to be added in 300 gm of cement will be = 300 x 26% = 300 x (26/100) = 78 ml. Then add 78 ml of water to 300 gm of cement, prepare well mix and test.; If the test is not successful, increase % of water by 28 %.
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2.4 Test methods 2.4.1 Macro-performance testing. The standard consistency water consumption, initial and final setting time and 2 h/adiabatic-flexural and compressive strength of modified phosphogypsum were tested in accordance with "Building Gypsum" (GB/T9776-2008). According to "Gypsum-based self-levelling mortar" (JC/T1023-2021), the 30 …
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The pure gypsum used in the experiment was taken from Tianjin kemio Chemical Reagent Co., Ltd. (Tianjin, China), where the content of CaSO 4 ·2H 2 O was ≥99%. ... Therefore, the water consumption of standard consistency of α-HH also gradually increased with the increase in H 3 PO 4 content. After citric acid was added, the water consumption ...
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The theoretical water demand of hemihydrous gypsum is 0.186 [17], but in order to achieve standard fluidity, a large amount of excess free water needs to be added to hemihydrous gypsum [18]. However, the presence of impurities and organic matter in PBG poses challenges, such as more water demand and reduced product strength.
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Download scientific diagram | Effect of LP on water requirement of standard consistency for phosphogypsum. from publication: Effect of limestone powder on mechanical properties and microstructure ...
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known. In cement factory, the water requirement is normally checked in the setting time test (Vicat), but the method (Standard consistency) /1/ is rather insensitive. The Standard consistency test is primarily made to adjust the consistency of cement paste suitable for the setting test, not to analyse the water requirement of cement.
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The standard consistency water consumption (abbreviated as SCWC) and the setting time of the cement paste were measured using a Vicat apparatus as per Chinese standard GB/T 346-2011. When the test rod sank into the cement paste and is 6 ± 1 mm away from the bottom plate, the corresponding cement paste is the standard consistency paste, and the ...
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The focus of this study was to compare the effects of milling time on the performance of building gypsum, the consistency of physical and mechanical properties …
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The effect of the solid loading (41–50 wt.%) of the slurry on granulometric composition and physico-chemical characteristics of Y2O3–Al2O3–Nd2O3 powder mixtures obtained by planetary ball ...
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It has 25% consistency. Therefore to prepare a standard consistency, we required = 1000 x 25% = 250g amount of water. Determination of standard consistency of cement. The standard consistency of cement test should be performed as per IS code 4031 part 4 specifications by the Vicat apparatus mentioned in IS code 5513.
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In this study, the compressive strength and water absorption of building gypsum were determined through a single-factor (cement, fly ash, and lime) test analysis. Based on …
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Types of ASTM standards for gypsum board. While there are several types of ASTM standards, in the context of gypsum board performance, the most important ones to understand relate to product, testing and application standards. ... ASTM also sets standards for testing to ensure consistency regardless of which independent lab performs the test ...
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The standard consistency water consumption of calcined gypsum powder was determined by referring to "Gypsum plasters-determination of physical properties of pure paste" (GB/T 17669.4–1999) [27]. The standard consistency water consumption was tested as follows: (1) 300 g calcined gypsum powder was weighed and stirred with certain amount of ...
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The experiment determined the optimal ratio of grouting ... gypsum, and the main factor of the 28d compressive strength is the water-binder ratio; the main factor affecting the vertical expansion rate of 3h and 24h is the gypsum content. ... Water consumption for standard consistency/% Setting time/min 2h/MPa 7d/MPa Initial setting Final ...
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Free Water 6 Fineness 7 Normal Consistency of Gypsum Plaster 8 Normal Consistency of Gypsum Concrete 9 Setting Time 10 Setting Time (Temperature Rise Method) 11 Compressive Strength 12 Density 13 1.3 The values regarded as the standard are either in inch-pound units or SI (metric). The values stated first shall be regarded as the standard.
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The use of phosphogypsum to prepare phosphorus building gypsum (PBG) is of great value to the resource utilization of phosphogypsum. In this study, PBG was ball-milled to obtain phosphorus ...
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ASTM-C187 Standard Test Method for Amount of Water Required for Normal Consistency of Hydraulic Cement Paste - consistency; normal consistency; Vicat needles ;; ICS Number Code 91.100.10 (Cement. Gypsum. Lime. Mortar)
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by water and the properties of hemihydrate. The microstructure development of gypsum. during hydration is investigated. The influence of water is studied from its effect on. fresh behavior and...
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a water bath (the water volume: 17.5 cm 17.5 cm 13.0 cm) for 24 h at 25 1C, and then took out to remove the excess water on the specimen surface with a dry cloth.
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The experiment results showed that building gypsum had the best performance when ball milling time ... refer to the Chinese national standard "Gypsum plasters—Determination of physical properties of pure paste" (GB/T 17669.4-1999). ... (from 76.4% to 60.07%). The water consumption of standard consistency reaches a minimum value of 60.07% ...
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The use of gypsum as plaster has been known for centuries, and there are many examples of its extra- ... If the consistency proved unsatisfactory, water was ... standard consistency testing of plain gypsum); 2) on a flow table according to ASTM C-109-54 and C-230-55 (in view of the fluidity of the mortars the method has ...
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Standard consistency= (water volume used to get the standard diffusing cm 3 /75 gm of gypsum) * 100
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