We studied lightweight vacuum-ed concrete containing fly ash and desulfurisation gypsum by revealing the influence of ... it is urgent to promote energy-efficient buildings, ... a slurry-making temperature of 50 °C and a ing temperature of 45 °C under the conditions of 60% fly ash and 40% cement, which gave a good ing …
Liu et al. (2016) studied the effects of desulfurized gypsum particle size, slurry concentration, and additive on CSW morphology. ... it cannot reflect the influence of temperature, time, and other factors on CSW morphology. Research on the crystal growth of CSWs prepared from oxidized desulfurized ash is lacking. Therefore, based on the …
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 ...
2.1.1. Building Gypsum The material applied during the research was building gypsum (Dolina Nidy, Pinczow). This gypsum is used in construction, renovation and completion works inside buildings. It is used for the production of …
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 …
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 …
The influence of ACSW on the rheological properties of gypsum slurry is greater than that of CW. In general, the two whiskers had the same effect on the working performance of the FGD gypsum slurry. The yield stress is the minimum stress required for the initial deformation of the slurry.
The paper assesses the influence of the calcination temperature of synthetic gypsum binder 14 on the binding properties of innovative gypsum pastes, as well as on masonry and plastering mortars.
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].
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 …
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 …
If these gypsums could be utilized, the situation of merely piling-up and burying of desulfurization gypsum would be changed and great environmental pressure would be alleviated correspondingly [16,17,18,19,20,21,22,23,24,25].Zhang et al. [] discussed the possibility of recycling desulfurization gypsum into calcium ferrite in iron …
The setting time has been done according to GB/T17669.4-1999 "Determination of physical Properties of building gypsum/Net Slurry ... building gypsum ... Influence of the calcination temperature ...
In addition, the influence of temperature on shear stress varied with the change of W/C. The increase in hydration time increased the shear stress of the slurry for each W/C. ... the influence of standing time is more pronounced than that of temperature. Slurry left for a duration exhibits a "stress overshoot" phenomenon at shear rates of 0–5 ...
Zeolite Socony Mobil-5 (ZSM-5) is a commonly spent catalyst in the petrochemical industry; and phosphogypsum (PG) is a kind of industrial waste produced in the process of phosphoric acid production. The environmental issues caused by these two solid wastes are urgent and thus sustainable methodologies are required to dispose of …
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 …
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 …
The paper assesses the influence of the calcination temperature of synthetic gypsum binder 14 on the binding properties of innovative gypsum pastes, as well as on masonry and plastering mortars.
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 …
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.
Influence of Early Strength Agent on the Strength and Water Resistance of Cement-Desulfurized Building Gypsum Composite Cementitious System January 2022 Journal of Physics Conference Series 2174(1 ...
Type of additives and water to cement ratio had little influence on the temperature dependence of E a. ... Gypsum Hemihydrate; Akesu: 66.95: 11.17: 1.84: 14.21: 2.05: 1.20: White: 73.96: 9.05: ... Fig. 10 gives more detailed quantitative information about the dependence of hydration kinetics on curing temperature and slurry …
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 …
Starting from the mixing of hemihydrate gypsum and water, the moment when the steel needle cannot reach the bottom of the mold was considered as the initial setting time. When the steel needle was inserted into the hemihydrate gypsum slurry to a depth less than 1 mm, the time consumed in this period was recorded as the final setting …
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.
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 …
The main purpose as to study the changes in gypsum slurry behaviour by incorporating three rates (5%, 15% and 25%) of Na-feldspar, dolomite and waste marble powder as …
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 …
Recently, the steel slag-fly ash-desulfurized gypsum (SS-FA-DG) composite system was developed as a novel building cementitious material, however, its reaction mechanism and reaction process mains unclear. ... FA-DG composite system by evaluating the influence of curing temperature on the formation of hydration products …
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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نشانی: شماره 1688، جاده شرقی گاوک، منطقه جدید پودونگ، شانگهای، چین.
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