Preparation and Hardening Performance of Lightweight Gypsum …
Desulfurized building gypsum (DBG) has great application potential and can be used to produce lightweight plastering gypsum (LPG). In this work, DBG was modified by adding different proportions of sawdust, retarder, and hydroxypropyl methylcellulose (HPMC) water-retaining agent to prepare LPG. When the sawdust content is greater than …
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Influence of water on deformation and failure of gypsum rock
Gypsum is an evaporitic mineral that plays an important role in several areas of structural geology and civil engineering. It is involved in orogenetic tectonics, …
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Building Materials
Quartz sand. Pure gypsum. Magnesite. Granite. None of these. 5. Pick up the correct statement from the following: For thin structures subjected to wetting and drying, the water cement ratio should be 0.45. For mass concrete structures subjected to wetting and drying, the water ratio should be 0.55.
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What is Rock? Types of Rocks and Their Properties
This sub-category has a distinct presence of gravels or smaller projected crystals of minerals. Chemical Rocks. Rocks that are formed of salt crystals and gypsum. Biochemical Rocks. This sub-category of sedimentary rocks is made from the compression and sedimentation of trees or animals for a prolonged time.
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sbm/sbm gypsum rock in civil engineering.md at main
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(PDF) Macro-Microscopic Deterioration Behavior of Gypsum Rock …
Gypsum rock is highly sensitive to a water environment due to its unique physical and chemical properties, such as high solubility. ... Aerospace and Civil Engineering, School of Engineering, The ...
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Experimental investigation into the effects of composition …
Gypsum has long been considered an important raw material for engineering construction. Based on its microstructure and component, gypsum rocks can be …
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Laboratory Tests on Swelling Properties of Field-Coring …
deformation and swelling pressure of gypsum rock may cause damage, which finally affects the stability of the engineering site [3–6]. Therefore, it is of practical significance to study the swelling characteristics of gypsum rock [4,5,7,8]. The swelling of gypsum rock is the result of coupling effects of physical swelling and chemical ...
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Gypsum Mineral | Uses and Properties
Gypsum is an evaporite mineral most commonly found in layered sedimentary deposits in association with halite, anhydrite, sulfur, calcite, and dolomite. Gypsum (CaSO 4. 2H 2 O) is very similar to Anhydrite (CaSO 4). The chemical difference is that gypsum contains two waters and anhydrite is without water. Gypsum is the most common sulfate mineral.
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Nonlinear Viscoelastoplastic Fatigue Model for Natural Gypsum Rock …
To investigate its fatigue damage characteristics, natural gypsum rock was tested under multiple cyclic loading conditions. According to the fatigue test, a nonlinear viscoelastoplastic fatigue model was established by combining several fatigue elements to describe the fatigue process of gypsum rock based on the equivalent stress assumption. …
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Resource utilization and development of phosphogypsum
1. Introduction. Phosphogypsum (PG) is a bulk industrial solid waste of wet-process phosphoric acid production. Every ton of phosphoric acid production generates as many as 4–6 tons of PG, including more than 90% of CaSO 4 ·2H 2 O, a small amount of phosphorus, fluorine, organic matter, oxides, heavy metals, radioactive substances and …
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Influence of Rock Strength on the Mechanical Characteristics …
The energy evolution processes of rock component and gypsum component are similar to the combination specimen. During the loading process, the energy stored in the rock is low due to the small deformation, but the energy stored in the gypsum is high due to the large deformation, which is almost equal to the combination specimen.
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Nonlinear Viscoelastoplastic Fatigue Model for Natural Gypsum Rock
To investigate its fatigue damage characteristics, natural gypsum rock was tested under multiple cyclic loading conditions. According to the fatigue test, a nonlinear viscoelastoplastic fatigue model was established by combining several fatigue elements to describe the fatigue process of gypsum rock based on the equivalent stress …
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Sustainability of gypsum products as a construction material
Natural gypsum, shown in Fig. 25.1, is the most common raw material for production of binders.It is a soft mineral, attributed to sedimentary rocks, normally grey or with no colour, with a humidity of about 8–10%. Gypseous stone, a denser modification of gypsum that is composed of gypsum and sandy and clayey stone, is normally used to …
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Physical and Mechanical Properties of Gypsum …
Meng Wang. Abstract and Figures. In the process of tunnel construction, gypsum rock is often encountered, and the volume of …
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Experimental investigation into the effects of composition …
Gypsum has long been considered an important raw material for engineering construction. Based on its microstructure and component, gypsum rocks can be classified into several kinds.
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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 …
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PhysicalandMechanicalPropertiesofGypsum-Like …
In the process of tunnel construction, gypsum rock is often encountered, and the volume of gypsum rock expands when en-countering water, which is easy to cause the occurrence …
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Study on the geological and engineering aspects of anhydrite/gypsum
A hot and arid climate, fluctuating relative humidity, and an alkaline environment govern the geological evolution and the engineering behaviour of soil deposits in the Arabian Gulf coastal region (Azam 2000).Hydration of anhydrite (CaSO 4) and dehydration of gypsum (CaSO 4 ·2H 2 O) lead to alternating volume changes, thereby …
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Geotechnical and Electrical Resistivity Properties of Gypsum …
Gypsum rich soils, mostly found in arid regions of the world are known to pose and number of geotechnical engineering hazards, the most common one being collapse settlement. In this research, the influence of gypsum content on the shear strength and collapsibility of reconstituted gypsum sands was studied. Reconstituted specimens …
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Physical and Mechanical Properties of Gypsum-Like Rock …
Advances in Civil Engineering. Journal overview For authors For reviewers For editors Table of Contents Special Issues. Advances in Civil Engineering / 2020 / Article / Tab 1 / Research Article Physical and Mechanical Properties of …
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Triaxial test research on mechanical properties and
In this study, the mechanical properties and permeability variation in single joint rock samples filled with a gypsum layer were investigated. In order to simulate the inclined infilled joint, the solid cylinders were saw-cut at the dip angles of 90°, 60°, 45°, 30° or 0° with respect to the samples' axes, and then joined together with gypsum. Triaxial …
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(PDF) Softening damage analysis of gypsum rock with …
Gypsum rock is also highly hydrophilic, quickly absorbing water and softening (Zhu et al. 2019). With increased water content and immersion time, the compressive strength and elastic modulus of ...
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Physical and Mechanical Properties of Gypsum-Like Rock …
In the process of tunnel construction, gypsum rock is often encountered, and the volume of gypsum rock expands when encountering water, which is easy to cause the occurrence of rock fall, collapse, and other disasters, bringing serious challenges to the safe construction of the tunnel. … See more
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Civil Engineering MCQs
View Civil Engineering MCQs - IndiaBix.pdf from CIVIL ENG CEE406 at COMSATS Institute of Information Technology, Abbottabad. A. Quartz sand B. Pure gypsum C. Magnesite D. Granite E. Building
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(PDF) Constitutive Model of Swelling Gypsum Rock
Swelling of soft rock, such as gypsum rock, is one of the major threats in tunnel engineering, causing structure damages such as. floor heave and inward movement of sidewalls during construction ...
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Influence of water on deformation and failure of gypsum rock
1. Introduction. Gypsum is an evaporitic mineral that plays an important role in several areas of structural geology and civil engineering. It is involved in orogenetic tectonics, influences basin dynamics, and is associated with many economic activities including oil exploration, mining, and waste repositories (e.g. Heard and Rubey, 1966; de …
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Experimental Study on Physical and Mechanical Properties of …
Abstract. In order to study the physical and mechanical properties of gypsum rock samples in three states (natural, high-temperature dehydration and hydration …
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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. …
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