Experimental investigation into the effects of composition …

To further explore the particle characteristics after failure of the four kinds of gypsum rocks, the SEM images were analyzed by Image Pro Plus and the diameters of the failure particles were measured and counted. The results are shown in Fig. 11. The fracture of fiber gypsum rock was along its fiber interlayer without obvious particle ...

GYPSUM CONSTRUCTION TROUBLESHOOTING GUIDE …

Learn how to identify and correct common defects in interior wall construction and finishing, such as fastener imperfections, joint cracks, loose panels, and discoloration. This …

Unpredictable Behaviour of Gypseous/Gypsiferous Soil: …

The gypsum containing soils were recognized initially in the soil science under the name "Sulphate Soils" by W. Knop in 1871. Later, few attentions have been given by soil scientist to soil containing gypsum which leads to the misconceptions on the composition and behaviour of soils with large proportions of gypsum [].Several …

Influence of water on deformation and failure of …

1 1 Influence of water on deformation and failure of gypsum rock 2 C. Caselle1,*, P. Baud2, A.R.L. Kushnir2, T. Reuschlé2, S.M.R. Bonetto1 3 1 - Department of Earth Sciences - DST, Università degli Studi di Torino, Torino, Italy 4 2 - Université de Strasbourg, CNRS, Institut Terre et Environnement de Strasbourg, UMR 7063, 5 5 rue René Descartes, …

Influence of water on deformation and failure of gypsum rock

In particular, underground mining excavations in gypsum have often resulted in roof collapses, pillar failures, water inrushes, and generation of surface subsidence, especially after unexpected water circulation and in abandoned or old underground sites (e.g. Bonetto et al., 2008; Wang et al., 2008; Sadeghiamirshahidi and Vitton 2019).

The Effect of Environmental Conditions on Drywall …

Influence of different gypsum plasterboards on the fire …

The fire resistance time of each specimen was determined by the insulation failure and integrity failure [26]. The determination of failure criteria was described as follows. ... and 31 °C/min, respectively, from 200 °C to 500 °C. This finding suggests that the insulation performance of the gypsum board TS-FGP after being subjected to fire ...

Eagle, Gypsum AT&T customers lose cell service after tower failure

EAGLE COUNTY — A third-party equipment failure above Glenwood Canyon knocked out AT&T phone service to the lower valley this week. Other providers weren't impacted. ... failure on a tower AT&T leases space on caused that company's customers to lose service this week in the Eagle-Gypsum area. AT&T brought in a "SatCOLT" truck to provide ...

Study on Damage Characteristics and Failure Modes of Gypsum …

The objective of this work was to investigate the damage characteristics and failure modes of gypsum rock under dynamic impact loading. Split Hopkinson pressure bar (SHPB) tests were performed under different strain rates. The strain rate effects on the dynamic peak strength, dynamic elastic modulus, energy density, and crushing size of …

Adhesion of Gypsum Plaster Coatings: Experimental Evaluation

Gypsum is a soft, compact, poorly soluble mineral, which is the primary material for the manufacturing of plaster. After extraction, gypsum undergoes some processing to suit the type of furnace where it will later be calcined. The processing stages are as follows: crushing, coarse grinding, stockpiling, drying, fine grinding, and packaging.

How to Use Gypsum in Gardening

You also need to apply gypsum regularly to ensure it has a continued benefit. It isn't enough to do one treatment and think this will be a permanent solution. After a few months, the effects will begin to wear …

Failure of a gypsum board after loading.

The connection of gypsum boards with staples or nails will not lead to failure at small drifts (h/100 to h/200), Figure 3, suggesting that such values could be appropriate limitations imposed by ...

Frequently Asked Questions (FAQs)

Find answers to common questions about gypsum board products, installation, fire resistance, sound control, and more. The FAQs are sourced from the GA's Technical …

USG REHABILITATION GUIDELINES FOR DAMAGED …

USG DurockTM Fusion Primer is a 3-part low viscosity sealer developed to efectively seal and consolidate the surface of soft, chalky and low strength gypsum underlayment. The …

Microsoft Word

Learn the causes, prevention, and repair of joint ridging and centerline cracking in gypsum panels. Find out how environmental conditions, workmanship, and framing affect the …

Experimental Investigation on the Mechanical Behavior and …

Gypsum mine disasters and accidents that frequently occur mainly consist of large scales collapse of the goaf roof, resulting in surface subsidence or sudden collapse (Gerolymatou and Nova 2008; Zhou et al. 2017; Xia et al. 2019; Laouafa et al. 2021).The leading cause is that after the mining completion of the gypsum mine, the roof control is …

Continental Building Products shuts down …

US: Continental Building Products says that a significant equipment malfunction took place at its Buchanan gypsum wallboard plant in New York state on 24 January 2019. The plant will likely be shut until the end …

Experimental investigation into the effects of composition …

Microscopic failure characteristics at a magnification of 2000 for the four types of gypsum rocks investigated: (a) fiber gypsum, (b) transparent gypsum, (c) …

All Things GypsumRepair and Painting of Gypsum Board

Author's Note: A portion of this month's column discusses touching up existing paint after a gypsum wallboard repair. The information is presented so that the drywall contractor will have a better understanding of how paint may work, in the hope that the knowledge may be of assistance on a future project. Presenting the information is …

Storms and Flooding: Gypsum Association Technical Resources

Gypsum board, also known as drywall or wallboard, is mandated by the building codes because it provides important passive fire resistance. This is why it is so important to replace drywall correctly. It is a primary means of protecting occupants from fire. In the event of any water damage to drywall, precautions must be taken to prevent …

Investigating the Failure Behavior of Gypsum Specimens …

The failure behavior and mechanism of fracturing in the gypsum specimens containing vertical notches under uniaxial compression was investigated in this study. The experimental tests and their corresponding numerical simulations were accomplished to explain the effects of vertical notches (edge cracks). Effects of the number of vertical …

Influence of water on deformation and failure of gypsum rock

Request PDF | Influence of water on deformation and failure of gypsum rock | While water is known to significantly reduce the strength of rocks, there remains a paucity of data on water-weakening ...

A Comprehensive Experimental Study on Mechanical Anisotropy and Failure

In this study, the effect of the movement direction of the printer head and bedding plane on macroscopic mechanical behavior and failure modes of 3D printed gypsum rocks were investigated.

Response of the mechanical properties of impurity-bearing gypsum …

The effect of long-term water immersion on the mechanical properties of porphyritic gypsum rock containing coarse-grained gypsum minerals and a variety of fine-grained minerals was explored using uniaxial and triaxial compression tests. XRD, SEM, and EDS analyses were utilized to discuss the water-softening mechanism in relation to …

Development of similar materials for fluid–solid coupling

This damage model can better describe the progressive failure process of rocks after rainwater infiltration, and can provide theoretical reference for the study of slope stability caused by ...

Experimental Research on Creep Failure Characteristics of Gypsum …

Creep damage of rock is one of the fundamental factors that lead to collapse of large goaf in gypsum mine, and in different damage stage, rock wave velocity show out different characteristics. In the paper, microscopic characteristics of gypsum rock are analyzed by technology of electron microscope scanning. Then variation characteristics …

All Things Gypsum The Moisture in Gypsum | Walls & Ceilings

For a high degree of accuracy when measuring the moisture content of gypsum board, it is generally recognized that laboratory test procedures provide reliable results. Convection ovens help evaporate the free water and enable the moisture content to be calculated by the difference in weight of the specimen before and after exposure to …

Experimental Study on Fatigue Life of Gypsum-Like Rock …

discretization. However, after being cast for a long time, the artificial cast gypsum rocks have uniform material and are small in discretization after sam-pling. Moreover, the strength parameters can be adjusted by changing the water content. When exploring mechanical properties, independent vari-ables such as material dispersion can be ...

Macro-Microscopic Deterioration Behavior of Gypsum Rock after …

Gypsum rock is highly sensitive to a water environment due to its unique physical and chemical properties, such as high solubility. After wetting, the internal microstructure of gypsum rock is damaged, and the mechanical properties deteriorate accordingly, leading to serious engineering problems for gypsum-bearing geotechnical …

(GA-600) Fire Resistive Properties of Gypsum and Fire …

Review pages 15-17 of GA-600-2018 Gypsum is approximately 21 percent, by weight, chemically combined water, which greatly contributes to its effectiveness as a fire-resistive barrier. When a gypsum panel product or gypsum plaster is exposed to fire, the water is slowly released as steam, effectively retarding heat transmission. When gypsum …

Influence of water on deformation and failure of gypsum …

Influence of water on deformation and failure of gypsum rock

Experimental investigation into the effects of composition …

To further explore the particle characteristics after failure of the four kinds of gypsum rocks, the SEM images were analyzed by Image Pro Plus and the diameters of the failure particles were ...

Review on the effect of gypsum content on soil behavior

At 15% gypsum content, the strength of the clayey soils attains a critical value, after which the specific cohesion decreases due to the failure of crystal bonds. The angle of internal friction increased steadily with increasing the gypsum content up to about 20% since the friction between the gypsum particles is greater than that between the ...

Problems, Remedies & Preventive Measures

Damaged Edges in ply separation along edge or in loosening of paper from gypsum core, or may fracture or powder the core itself. Damaged edges are more susceptible to …

Step-by-Step Guide to Applying Gypsum Plaster

Once the wall is prepared, the gypsum plaster can be applied evenly. After the plaster has dried, a lime wash paint can be applied to give the wall a beautiful finish. The Gypsum Plastering Process. Clean the surface thoroughly for preparation. Mix the gypsum plaster with water until smooth.

Propagation Characteristics of Stress Waves and Failure …

To investigate the effects of the impact velocity and joint dip angle on stress wave propagation and fracture evolution of rock masses, dynamic impact experiments of the gray sandstone samples with gypsum-filled joints were carried out by split Hopkinson pressure bar (SHPB), and the failure process was captured by high-speed photography. …