Influences of fluid physical properties, solid particles, and …
Slurry reactors are popular in many industrial processes, involved with numerous chemical and biological mixtures, solid particles with different concentrations and properties, and a wide range of operating conditions. These factors can significantly affect the hydrodynamic in the slurry reactors, having remarkable effects on the design, scale …
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Highly efficient modified phosphogypsum building gypsum …
It was shown that the phosphogypsum, first treated by ball milling for 5 min and then modified at low temperature of 165 °C, had a flexural strength of 2.35 MPa …
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(PDF) The effects of mixing slurry water with type III gypsum …
Methods: Eighty-one samples were made of type III gypsum, divided into three groups: group A was gypsum mixed with 1% slurry water, group B, gypsum mixed with 2% slurry water and group C, gypsum ...
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Preparation and Pore Structure of Energy-Storage Phosphorus Building Gypsum
The temperature range of the gypsum-based phase-change energy-storage material mixed with 50% CPCM could reach 7.4 °C and 12.4 °C in the process of heat storage and release, respectively. ... T17669.3-1999), part of the phosphorous building gypsum slurry was poured into a 40 × 40 × 160 mm triple die to test its compressive …
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Influence of extreme high-temperature environment and …
The change law of the viscosity with temperature directly affects the diffusion distance of the slurry and grouting pressure in a high-temperature environment. The …
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Interaction mechanisms between polycarboxylate …
Illustrated in Fig. 1, polycarboxylate ether (PCE) manifests as a macromolecular copolymer characterized by a comb-like spatial structure, affording flexibility and design adaptability within its molecular framework.The molecular main chain serves the crucial function of anchoring within the cement slurry, while the molecular …
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High value-added utilization of desulfurized building …
The utilization of desulfurized building gypsum as raw material for gypsum-based self-leveling mortar (GSL) is limited by its low strength and poor water …
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Effects of several retarders on setting time and strength of building
Eight retarders on setting times and strength of building gypsum were investigated. ... The results showed that pH and temperature had a great influence on retardation. ... stopped for 15 s and then continued to stir at a high speed for 2 min to form gypsum slurry. The gypsum slurry was poured into the test mold quickly and inserted …
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Study on retarding feature and retardation mechanism of …
Specifically, the setting time of building gypsum is only 5–20 min (initial setting time of 5–10 min and final setting time of 15–20 min), which cannot be permitted convenient transportation and pouring of gypsum slurry [52]. Many studies have showed that the setting property of building gypsum was affected by many factors [53].
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Basalt-Fiber-Reinforced Phosphorus Building Gypsum …
The preparation of fiber-reinforced phosphorus building gypsum composite materials (FRPGCs) is an important approach to enlarge the utilization of phosphogypsum resources. Through reinforcing phosphorus building gypsum (PBG) with basalt fiber (BF), this article probes into the effects of the length and fiber content of BF on the working …
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Changes in the Strength Properties and Phase Transition of …
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 …
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Study on the influence mechanism of flue gas desulphurisation gypsum …
The FGDG re-dissolves in the slurry, crystallises, and grows into different whisker structures, which improve the mechanical properties of the grouting materials. ... Influence of FGDG on the mechanical properties of the grouting materials. ... Application of the Industrial Byproduct Gypsum in Building Materials: A Review. 2024, Materials. View ...
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Polymeric-SiO2-PCMs for improving the thermal properties of gypsum
Section snippets Materials. The thermal properties of the Polymeric-SiO 2-PCMs were evaluated by differential scanning calorimetry (DSC), presenting a latent heat of fusion of 111.2 J/g and a melting point of 26.19 °C. Besides, according to the low angle laser light scattering (LALLS) results, the Polymeric-SiO 2-PCMs have an average …
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Buildings | Free Full-Text | The Composition and …
The fresh slurry was cast in a 100 mm × 100 mm × 100 mm mold and then put into a constant temperature curing box with a temperature of 65 °C for 12 h to achieve the adequate demolding strength. To ensure that the samples used in the mechanical tests are of the same shape, the expanded part outside the volume of the mold was removed …
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Influence of calcination and GGBS addition in preparing β …
This is because the main composition of PG is dihydrate gypsum (CaSO 4 ⋅2H 2 O), which can be dehydrated to form synthetic hemihydrate gypsum, like natural mineral gypsum. Depending on the temperature and condition of the dehydration process, natural gypsum exists in four different phases, namely hemihydrate gypsum (CaSO 4 …
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Study on the influence mechanism of flue gas …
The mechanical properties, phase composition, and microstructure of the grouting materials were determined using a universal testing machine, X-ray diffraction, …
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Gypsum reduces methane emission during the storage of pig slurry
Methane is the most prevalent greenhouse gas from animal agriculture. The main source of methane emission is ruminant metabolism; however, animal manure also makes a significant contribution. Manure management can offer possibilities for emission reduction. The influence of sulfur, in the form of gypsum (CaSO4), on methane …
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Production and resource utilization of flue gas desulfurized gypsum …
Introduction. Flue gas desulfurized gypsum mainly comes from thermal power plants, smelters, and large-enterprise boilers, and contains industrial by-products produced through a wet desulfurization combustion process, where SO 2 gas and lime slurry react under strong oxidation conditions. The main component of this gypsum is …
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Construction and Building Materials
To study the influence of temperature on CSW quality, 15 g of FGD gypsum is mixed with 300 mL of HCl solution at the optimized concentration and stirred at temperatures ranging from 50 to 100°C. ... FGD Gypsum slurry was heated and agitated in a high-pressure reactor with Na 2 SO 4 /K 2 SO 4 to CaCl 2 /NaOH/NaCl molar ratio …
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Progress in the polycarboxylate superplasticizer and their …
Thus, in order to systematically explain the influence of PCE structure on their performance and provide theoretical basis for the PCE molecular design in the future, this review summarizes the synthesis technology of PCE and the influence of molecular structure such as anchoring group, main chain, side chain and topological structure on …
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Journal of Building Engineering
As the temperature increases, the mass of SEC tends to decrease, mainly due to the fact that some substances undergo thermal decomposition in a specific temperature range, resulting in a loss of mass. There is no obvious heat absorption peak in the DSC curves, and the change around 100 °C is mainly due to the dehydration of the C-S-H gel and AFt.
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Gypsum-type precision casting powder is mainly consisted of gypsum powder (usually α-type high strength gypsum powder) mixed with admixtures and other fillers having high …
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The relationship between water-binder ratio and
In this study, a slurry-particle mixing system was proposed for the preparation of PBG-based building materials with homogeneous hydration at low water/gypsum ratios. More specifically, slurry ...
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Testing procedure. (a) Heating temperature. (b) Fineness.
In this study, a slurry-particle mixing system was proposed for the preparation of PBG-based building materials with homogeneous hydration at low water/gypsum ratios. More specifically, slurry ...
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Influence of the bleeding characteristic on density and …
This study aimed to investigate the influence of cement slurry bleeding on the evolution of the slurry density and rheological properties during bleeding. Portland cement PO42.5 with the water-cement ratio (W/C) ranging from 0.8 to 2.0 was used as the research object. ... The bleeding and rheology of a cement paste affect the grouting ...
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Study on the influence mechanism of flue gas …
The effects of FGDG dried at different temperatures (105 °C, 120 °C, and 220 °C) on the compressive strength, fluidity, stone ratio, setting time, and rheological …
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Environmental filling materials based on phosphogypsum …
The feasibility of MSWI fly ash and phosphogypsum as filling materials for building engineering is verified, and the change of macroscopic properties of NBFM is explained as well.
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Preparation, properties and hydration process of low temperature …
Introduction. When extracting gas hydrate in permafrost regions, the occurrences of collapse, necking and slurry leakage in a shaping borehole are quite common, and the problem of wall protecting and leakage plugging is very serious, which seriously affect the operation of gas hydrate exploitation [1], [2], [3].Therefore, wall …
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The influence of cellulose derivatives on water structure in gypsum
1. Introduction. Gypsum plaster, CaSO 4 ·2H 2 O (also known as dihydrate) is one of the oldest building materials. It is used widely as indoor building material because of its numerous advantages: easy fabrication, low price, aesthetics, environmental friendliness, fire resistance, etc. [1].Calcium sulfate dihydrate can be found in nature as …
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Rheological properties of cement-based slurry and …
1. Introduction1.1. Background. Cement-based materials have become the most widely used building materials owing to their low cost, good plasticity, and high strength [1], [2], [70].Rheology can be applied to practical engineering to guide the smooth progress of engineering construction [3], [4], [5].Fly ash, slag, and other mineral …
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