Enhancing the Characteristics of Gypsum Soil by Adding …
The purpose of the evaluation was to examine the compressibility characteristics of gypsum soil using the oedometer collapse test. To calculate the dry weight of the specimens, a drawing with a 60mm diameter and 20mm height ring was used. The samples were immersed in water at a pressure of 200kPa for 24 hours, and the load was released whenever ...
CN219991455U
The utility model discloses a gypsum aging device, and relates to the technical field of gypsum processing equipment. The utility model comprises an aging barrel, wherein a barrel cover is arranged at the top of the aging barrel, a servo motor is fixedly arranged at the central position of the top of the barrel cover, an air inlet branch pipe is fixedly penetrated through the top of the …
Effects of various gypsum on early-age hydration …
and contents of gypsum were incorporated into MOCP, and their early-ages exotherm characteristics were tested and analyzed. Meanwhile, the hydration kinetic parameters of gypsum-modied MOCP were calculated, and the inuence mechanism of gypsum on the hydration process of MOCP was discussed. Experimental details Materials LBM, gypsum, MgCl 2
A new age, provenance and tectono-sedimentary setting of …
The age of 547.3 ± 4.8 Ma in southwestern Sichuan (this paper) is consistent with the age of 546.3 ± 2.7 Ma (Yang et al., 2017a) in eastern Yunnan, the maximum depositional age of 548.3 ± 8 Ma (Cui et al., 2016) in southern Shaanxi, and is also identical to the age of 547.36 ± 0.23 Ma in Namibia and the age of 546.72 ± 0.21 Ma in Oman ...
Effects of loading rate on strength characteristics of …
of gypsum stiffness with the increase of curing/ageing period. plasterboard waste during manufacturing, construction and demolishing stages of these plasterboards.
Gypsum: Isotopes & Dating
Isobar Science offers dating of gypsum crystals using the U-Th technique. Gypsum samples submitted for U-Th dating must be a minimum of 1000mg, free of organics and detrital carbonates and should be packaged either in glass or plastic vials. ... A., Obert, C., Münker, C., Fernández-Cortés, Á. and Calaforra, J.M., 2022. The Absolute Age and ...
Table 1 . Compressive strength after 14 days of …
It has been detected that a reduction of a specific surface area of plaster... | Gypsum, Calcium Sulfate and Materialism | ResearchGate, the professional network for scientists.
Effects of various gypsum on early-age hydration behavior …
Gypsum modification is an effective strategy to improve the water resistance of magnesium oxychloride cement paste (MOCP), but its early-ages performance evolution has not received much attention. The exothermic characteristics and hydration kinetic parameters of MOCP with different contents and types of gypsum are investigated. The results show that the …
Innovative gypsum processing at GIPS AD
This effect is known as 'natural aging' (or 'aging' for short), and is based on the reaction of the gypsum with moisture. Calcined gypsum from a technical process is not a pure gypsum hemihydrate, but also consists of water-free gypsum, mostly in the form of AIII (soluble anhydrite), as well as un-calcined remains in the form of gypsum ...
Enhanced gypsum scaling by organic fouling layer on …
There were some other notable characteristics of gypsum scaling behavior under different conditions. Initially (i.e., at the preliminary stage), the flux decline was caused by concentration polarization that resulted in additional resistance to water transporting through the membrane. Compared with other conditions, the substantial flux ...
Gypsum: Properties, Uses, Formation, Types – Geology In
Characteristics & Properties of Gypsum. Composition: Calcium sulfate dihydrate (CaSO₄·2H₂O). This means gypsum is a hydrated sulfate mineral, containing calcium, sulfur, and chemically bound water molecules. Color: Gypsum is typically colorless, white, or gray. However, impurities like iron oxides or clay can introduce colors like yellow ...
Investigation of geotechnical and microstructure characteristics …
This uniqueness likely stems from the complex interactions and characteristics of gypsum in the soil, making it a challenging material to reproduce in controlled experiments. ... In this study, the significant increase in strength observed in the 90-day curing age gypsum soil samples compared to the base soil can be attributed to various ...
Compressive strength of plaster composites with aging time.
Compressive strength of plaster composites with aging time. The presented points are the mean values of 5 experimental values with standard deviation not more than 0.25 MPa.
Characterization of Natural Gypsum Materials …
The low concentration of oxide impurities in the studied gypsum places it within the range of low-impurities gypsum or pure gypsum, if base on Bouzit et al. [42] classi cation of Morocan gypsum. ...
(PDF) Durability Assessment of Gypsum Boards with Glass …
BS EN 15283-1(Gypsum boardas with fibrous reinforcement -Definitions, requirements and test methods -Part 1: Gypsum boards with mat reiforcement). Comité Européen de Normalisation, UK. ISO.
The Relationship Between Water Demand and Particle Size …
Particle size analysis and several methods of consistency measurement were used for this purpose. It was found that a direct relationship exists between water demand of stucco and …
(PDF) Gypsum-Enhanced Red Mud Composites: A Study on …
The effects of varying gypsum types and mixing ratios on the mechanical properties and heavy metal leaching of the resulting red mud-based materials were assessed using percussion tests ...
Investigation of geotechnical and microstructure characteristics …
Investigation of geotechnical and microstructure characteristics of gypsum soil using ground granulated blast-furnace slag (GGBS), fly ash, and lime ... "Experimental Study on Early Age Characteristics of Lime-GGBS-Treated Gypseous Clays under Wet–Dry Cycles." 1(2): 402–415. ... "Gypsum soils—Their morphology, classification, function ...
Effect of desulfurization gypsum on alternating-current …
Its main components are dihydrate gypsum and hemihydrate gypsum, which have good solubility and are similar to natural gypsum [29], [30]. There are few reports on the effect of different contents of desulfurization gypsum on the formation rate of ettringite. The role of desulfurization gypsum in BSAC hydration remains to be further studied.
Characterization of Natural Gypsum Materials and Their …
The low concentration of oxide impurities in the studied gypsum places it within the range of low-impurities gypsum or pure gypsum, if base on Bouzit et al. [42] classi cation of Morocan gypsum. ...
Early-age hydration characteristics and kinetics model of …
In this study, the early-age hydration characteristics of blended cement with CBP and slag were investigated by analyzing the 148-h hydration heat. Then, the influence of replacement rate of admixture, CBP to slag ratio and temperature on hydration kinetics parameters was studied to analyze early-age hydration mechanism of blended cement.
Innovative gypsum processing at GIPS AD
A property of freshly-calcined β-hemihydrate (HH) is that it changes its characteristics during extended storage or handling. This effect is known as 'natural aging' (or …
Gypsum
The largest known deposits of gypsum occur in strata from the Permian age. Gypsum from New South Wales, Australia. ... Characteristics. In nature, gypsum occurs in a variety of crystalline forms, noted below. The pure crystals are colorless and transparent. This mineral has insulating properties and feels warm when touched, as compared with ...
Gypsum | Definition, Uses, & Facts | Britannica
Gypsum occurs in extensive beds associated with other evaporite minerals (e.g., anhydrite and halite), particularly in Permian and Triassic sedimentary formations; it is deposited from ocean brine, followed by anhydrite and halite.It also occurs in considerable quantity in saline lakes and salt pans and is an important constituent of cap rock, an anhydrite-gypsum rock …
Gypsum Cave Cluster
Age / Periods: Date: 7,000 - 2,800 B.P. Cultural Period: ... Gypsum Cave Cluster. Types Included in Cluster: Augustin, Gatecliff, Gypsum Cave. Description of Physical Characteristics: Manufacturing Comments: Changes in the point life span comments: ... The Gypsum Cave extends down to northern Sonora and northern Baja California, Mexico, and the ...
Investigation of geotechnical and microstructure characteristics …
Request PDF | Investigation of geotechnical and microstructure characteristics of gypsum soil using ground granulated blast-furnace slag (GGBS), fly ash, and lime | This study investigates the ...
Production and resource utilization of flue gas desulfurized gypsum …
Flue gas desulfurized gypsum (FGD gypsum), mainly originates from thermal power plants, smelters, and large-scale enterprise boilers.This article reviews the production in China and the latest beneficial utilizations of FGD gypsum. China is a large coal-consuming country and has always had serious SO 2 emissions. Therefore, the Chinese government has implemented …
Review of gypsum reinforced composites as building materials
The utilization of gypsum reinforced composites as building materials has garnered considerable attention owing to their exceptional amalgamation of mechanical strength, fire resistance, and versatile applications. This review initiates by introducing gypsum as a pivotal mineral in construction, subsequently exploring the concept of composite materials and …
Gyspumation 4-09.cdr
Joint Treated Gypsum Panel Surfaces, Interior Drywall Specifications, and Recommended Surface Treatment for Finishing Gypsum Panels to Attain a Level 5 Finish. In 2008, the Technical Committee of the Gypsum Association reviewed GA-214 and made recommendations for minor changes to the document for which it would need approval from the other
The aging of gypsum in underground mines
The aging properties of gypsum extracted from two underground mines in France (Livry–Gargan and Grozon) have been highlighted by means of observation performed using …