after gypsum failure

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 …

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 …

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.

Influencing Factors for the Instability and Collapse Mode …

Large-area goafs in a gypsum mine tend to collapse after 10 or more years, but the influencing factors are still unclear, and the effects of multiple factors have not been comprehensively considered.

Dispelling common myths associated with poured gypsum …

Poured gypsum floors achieve high compressive strengths in hours versus a typical 28-day cure cycle for traditional cements. In wood-framed construction, gypsum can be poured directly on the wood without wire lath reinforcement at 19 mm (3⁄4 in.) minimum thickness to achieve a one-hour fire rating.

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 …

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 ...

GA 222 2019 REPAIRING SCREW OR NAIL POPS

The protrusion of screw or nail heads above the gypsum panel surface can be caused by one or more of the following: Lumber shrinkage occurring after gypsum panel product …

Moisture in Gypsum Panel Products

The number of inquiries to the Gypsum Association about water-damaged gypsum panels always increases during the winter, early spring, after hurricane season or after any other significant water exposure event. Answers to many of these questions are found in an Association document revised in 2019, GA-231 Assessing Water Damage to …

The benefits of gypsum for sustainable management and …

Background Gypsum is a valuable resource for farmers, supplying essential calcium and sulfur for plant growth. It serves as a crucial soil amendment, particularly in reclaiming alkali and sodic soils. While not a material, gypsum is widely recognized as a nutrient source for calcium and sulfur in acidic soils. The presence of calcium in …

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) …

Influence of water on deformation and failure of gypsum …

Influence of water on deformation and failure of gypsum rock

Coatings | Free Full-Text | Study on the Micro Mechanism of Failure …

To investigate the macroscopic mechanical properties and failure evolution mechanism of desulfurization gypsum–fly ash fluid lightweight soil, a microscale numerical model using PFC2D (Particle Flow Code) was constructed. Uniaxial compression tests were conducted to determine the microscopic parameters of the model, extracting information …

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. …

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 ...

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 …

Fire Resistance Testing

Fire_Safety_Information (PDF) Passive Fire Resistance The passive fire resistance provided by fire-resistant rated gypsum based assemblies for walls, ceilings, floors, and other building systems, slows or prevents the spread of fire, allows time for evacuation, and limits fire damage. Passive fire protection measures are intended to contain a fire and …

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 Physical and Mechanical Properties of Gypsum …

(1) The failure mode of hydrated gypsum rock was closely related to soaking time; with increase in hydration time, dehydrated gypsum rock formed dihydrate gypsum, which strengthened the sample, opened after the weak surface absorbed water, and intensified the damage of the sample.

(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 …

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 …

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 ...

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 ...

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, …

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 …

The Effect of Environmental Conditions on Drywall …

Mechanical properties of Michigan Basin's gypsum before and after …

1. Introduction. Determining the mechanical properties of gypsum rock is important in many engineering projects including the stability of abandoned underground gypsum mines, especially for mines that become flooded after mining operations have been completed (Doulati Ardejani et al., 2013).Uniaxial compressive strength (UCS) is …

Effects of concrete/gypsum bedding layers and their …

Failure pattern of one layer of gypsum and one layer of concrete with differe nt interface angle of (a) 0°, (b) 30°, (c) 60° and (d) 90°.

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 …

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 ...