# uniaxial compressive strength of gypsum

## Predicting the Uniaxial Compressive and Tensile Strengths

Predicting the Uniaxial Compressive and Tensile Strengths of Gypsum Rock by Point Load Testing M. Heidari • G. R. Khanlari • Mehdi Torabi Kaveh • S. Kargarian Received: 25 October 2010/Accepted: 17 October 2011/Published online: 2 November 2011 Springer-Verlag 2011 Keywords Gypsumrock Uniaxial compressive strength

## Features and Constitutive Model of Gypsum’s Uniaxial Creep

The stress in uniaxial compression creep tests is divided into three levels: 50%, 60%, and 70% of the uniaxial compressive strength. Since the previously measured average uniaxial compressive strength of gypsum rock is 64 MPa, the three stress levels are

## Uniaxial Compressive Strength an overview

The uniaxial compressive strength of a rock under static loading often decreases with an increasing temperature at which the rock has been heat-treated before strength testing. This conclusion is drawn from a great number of experiments [1,2,4,8,9,11,17–19].The higher the temperature is, the lower the strength. Some results for uniaxial compressive strength σ c and tensile strength σ t

## GA 235 2019 FINAL 031119 American Gypsum

Compressive Strength (typical) Ultimate compressive strength at 70oF o(21 C) and 50% Relative Humidity (RH) Determinations were made from 2" x 2" (50 x 50 mm) or 4" x 4" (100 x 100 mm) samples cut from across the full board width (excluding taper). Samples were conditioned for a minimumОнлайн-запрос

## Physical and Mechanical Properties of Gypsum-Like Rock

Mohammadhossein and Stanley [24,25] suggest that a higher drying temperature of 80°C can be used for drying gypsum without transforming gypsum to hemihydrate and investigated the strength of gypsum in an as-received saturated condition using uniaxial compressive strength (UCS), Brazilian tensile strength (BTS), and point load index (PLI) tests.

## (PDF) Predicting the Uniaxial Compressive and Tensile

A point load test in different directions was conducted by Heidari et al. [15] and the uniaxial compressive strength and tensile strength of gypsum rock were predicted by using a regressionОнлайн-запрос

## (PDF) Physical and Mechanical Properties of Gypsum-Like

Li et al. [20] performed uniaxial compression tests on gypsum rock after different times of wet and dry cycles; the results showed that the water absorption, porosity, uniaxial compressive

## The influence of natural reinforcement fibers, gypsum and

The uniaxial compressive strength is the compressive strength of soil samples with free lateral expansion. It is the maximum value of the uniaxial compressive stress. q u ¼ r max ðN=mm2Þð1Þ The uniaxial compressive stress is deﬁned by the ratio of the axial force F (N) and the cross section area A (mm2). r¼ F=A ðN=mm2Þð2Þ 3. ResultsОнлайн-запрос

## Mechanical properties of Michigan Basin's gypsum before

Aug 01, 2019· 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 one of the most widely used rock parameters inОнлайн-запрос

## Uniaxial Compressive Strengths of Rocks Drilled at Gale

The Stimson and Murray rocks are lithified fine sandstones and coarse silty mudstones, respectively, with varying compressive strengths. Thomson et al. (2013, 2014) illustrated that the energy per unit volume needed to break the bonds of a volume of rock correlates to uniaxial compressive strength (UCS).Онлайн-запрос

## Relationship between uniaxial compressive strength and

Relationship between uniaxial compressive strength and slake durability indices of dolomite-gypsum sequenced rocks operated in Denizli from operational point view. Denizli Turkey Project No:2012FBE015 (in Turkish with English Abstract).Онлайн-запрос

## Predicting the Uniaxial Compressive and Tensile Strengths

Nov 02, 2011· Predicting the Uniaxial Compressive and Tensile Strengths of Gypsum Rock by Point Load Testing Predicting the Uniaxial Compressive and Tensile Strengths of Gypsum Rock by Point Load Testing Heidari, M.; Khanlari, G.; Torabi Kaveh, Mehdi; Kargarian, S. 2011-11-02 00:00:00 Rock Mech Rock Eng (2012) 45:265–273 DOI 10.1007/s00603-011-0196-8 TECHN ICAL NO TE Predicting the Uniaxial CompressiveОнлайн-запрос

## Analyzing the rules of fracture and damage, and the

The uniaxial compressive strength, elastic modulus, and stress–strain of the different rock samples were studied. 3. Mechanical properties and fracture damage of gypsum and sandstone samples 3.1. Mechanical properties of gypsum and sandstone samples. Figure 3 shows the full stress–strain curves of the gypsum and sandstone samples.Онлайн-запрос

## Uniaxial Compressive Strengths of Rocks Drilled at Gale

The Stimson and Murray rocks are lithified fine sandstones and coarse silty mudstones, respectively, with varying compressive strengths. Thomson et al. (2013, 2014) illustrated that the energy per unit volume needed to break the bonds of a volume of rock correlates to uniaxial compressive strength (UCS).Онлайн-запрос

## Prediction of the uniaxial compressive strength of rocks

Uniaxial compressive strength (UCS) is an important mechanical parameter for stability assessments in rock mass engineering. In practice, obtaining the UCS simply, accurately and economically has attracted substantial attention. [47] I. Yilmaz; G. Yuksek Prediction of the strength and elasticity modulus of gypsum using multiple regression

## THE UNIAXIAL COMPRESSIVE STRENGTH OF SOFT ROCK

Keywords: soft rock, uniaxial compressive strength, physical characte ristic, point load strength index, and conversion factor. INTRODUCTION strength due to changes in moisture content seems The term soft rock is often referred to rock materials with a uniaxial compressive strength (UCS) lower than that of hard rocks and higher than that of soils.

## Estimating Unconfined Compressive Strength of Sedimentary

[4] relating uniaxial compression and the point load tests on a variety of rocks. They found the following linear regression model to correlate the UCS and I s(50). qI u = +16.3 15.3 s(50) 3. The UCS Test There are three types of compressive strength tests of rocks as defined by Jaegar l. [5]; the first is the UCS et a

## Crush Curve Measurements of Porous Materials Used for

Normalized by uniaxial compressive strength pumice gypsum Pressure/compressive strength sintered glass beads α (= solid density/porous density) 0.01 0.1 1 10 100 12345 almost elastic deformation plastic deformation pumice gypsum Pressure/compressive strength sintered glass beads α (= solid density/porous density) 0.01 0.1 1 10 100 1.2 1.3 1.4

## PHYSICAL PROPERTIES OF SALT ANHYDRITE, AND GYPSUM

P the maximum compressive yield strength will not be > 500 kg/cm « Ihese results apply only for slow loading rates; with impact loading under hydrostatic pressure> the strength will probably be 2 to 3 times greater. With fairly rapid loading in air, salt is brittle, and the strength is about lj-5 kg/cm . With very slow loading, the salt is strain

## STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1

STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1. INTRODUCTION 2. TESTING OF INTACT ROCK FOR STRENGTH 2.1 Uniaxial Compression 2.2 Point Load Testing 2.3 Uniaxial Tension 2.4 Indirect Tension Tests 2.5 Shear Tests 2.6 Confined Compression Tests (Triaxial Tests) 2.7 Biaxial and Multiaxial Tests 2.8 Other Tests 3. PARAMETERS AFFECTING ROCK STRENGTH 4.Онлайн-запрос

## Failures and Strengths of Gypsum Specimens containing Pre

Aug 29, 2017· Uniaxial compression experiments were carried out to study the strengths and failures of gypsum samples with some pre-existing flaws in non-overlapping geometry. These prepared samples were expected to have same strength by the stress analysis14) which is

## Investigation of creep behaviours of gypsum specimens with

and the UCS (uniaxial compressive strength) of host rock. Once stress redistribution results in a critical imbalance of energy, the crack propagation is induced. Regardless of the rock type, in the case of rock-like material, the microscopic processes and further macroscopic processes are occurring with similar cracking process.Онлайн-запрос

## Publications on Michigan Basin's gypsum | Geoengineer

Testing samples of gypsum must, therefore, simulate these conditions as close as possible. In this research, the strength of gypsum is investigated in an as-received saturated condition using uniaxial compressive strength (UCS), Brazilian tensile strength (BTS) and point load index (PLI) tests.

## A predictive model for uniaxial compressive strength of

compressive strength and Schmidt hardness from the samples of gypsum. Yasar and Erdogan [12] investigated the statistical relationship between hardness value and physico-mechanical properties of constructional and cover rocks. They found high correlation values between Schmidt Hammer hardness and uniaxial compressive strength.Онлайн-запрос

## Predicting the Uniaxial Compressive and Tensile Strengths

Nov 02, 2011· Predicting the Uniaxial Compressive and Tensile Strengths of Gypsum Rock by Point Load Testing Predicting the Uniaxial Compressive and Tensile Strengths of Gypsum Rock by Point Load Testing Heidari, M.; Khanlari, G.; Torabi Kaveh, Mehdi; Kargarian, S. 2011-11-02 00:00:00 Rock Mech Rock Eng (2012) 45:265–273 DOI 10.1007/s00603-011-0196-8 TECHN ICAL NO TE Predicting the Uniaxial Compressive

## Features and Constitutive Model of Gypsum s Uniaxial Creep

weakly acidic groundwater. In this paper, the rock samples in the gypsum mining area were taken as the research object. Uniaxial compression creep tests were carried out under neutral water, pH=6 and pH=5 hydrochloric acid solutions, respectively. Meanwhile, the specimens before and after saturation were observed by an electron microscope scanner.Онлайн-запрос

## Failures and Strengths of Gypsum Specimens containing Pre

Aug 29, 2017· Uniaxial compression experiments were carried out to study the strengths and failures of gypsum samples with some pre-existing flaws in non-overlapping geometry. These prepared samples were expected to have same strength by the stress analysis14) which isОнлайн-запрос

## Prediction of the uniaxial compressive strength of rocks

Uniaxial compressive strength (UCS) is an important mechanical parameter for stability assessments in rock mass engineering. In practice, obtaining the UCS simply, accurately and economically has attracted substantial attention. [47] I. Yilmaz; G. Yuksek Prediction of the strength and elasticity modulus of gypsum using multiple regression

## Predicting Unconfined Compressive Strength of Intact Rock

UCS Uniaxial compressive strength, n porosity, ρ density, SH Schmidt hardness, PLS point load strength, Vp Primary wave velocity, BPI block punch index, CI cone indenter hardness, WC water content, SD slake durability index, ν Poisson’s ratio, TS Tensile strength, GS Grain size, RT Rock type, EH Equotip hardness.

## Investigation of creep behaviours of gypsum specimens with

and the UCS (uniaxial compressive strength) of host rock. Once stress redistribution results in a critical imbalance of energy, the crack propagation is induced. Regardless of the rock type, in the case of rock-like material, the microscopic processes and further macroscopic processes are occurring with similar cracking process.

## Crush Curve Measurements of Porous Materials Used for

Normalized by uniaxial compressive strength pumice gypsum Pressure/compressive strength sintered glass beads α (= solid density/porous density) 0.01 0.1 1 10 100 12345 almost elastic deformation plastic deformation pumice gypsum Pressure/compressive strength sintered glass beads α (= solid density/porous density) 0.01 0.1 1 10 100 1.2 1.3 1.4

## Estimating Unconfined Compressive Strength of Sedimentary

[4] relating uniaxial compression and the point load tests on a variety of rocks. They found the following linear regression model to correlate the UCS and I s(50). qI u = +16.3 15.3 s(50) 3. The UCS Test There are three types of compressive strength tests of rocks as defined by Jaegar l. [5]; the first is the UCS et a

## Investigating the Effect of Specimen Diameter Size on

Uniaxial compressive strength (U CS) and elastic properties of rocks play a major and vital role for the design of any engineering structure. The specimen diameter size is one of the main factors that influencing on UCS, elasticity modulus and Poisson’s ratio (E and υ). Here, an attempt has been made toОнлайн-запрос

## Unconfined compressive strength of shale as a function of

Jun 01, 2011· Estimation of the strength of shale is of great interest to geologists, as well as civil, mining, and petroleum engineers, involved in various design projects. Among the different strength parameters, Unconfined Compressive Strength (UCS) is most frequently used in rock mechanics and is usually determined through a laboratory test.Онлайн-запрос

## Predicting the Uniaxial Compressive and Tensile Strengths

Predicting the Uniaxial Compressive and Tensile Strengths of Gypsum Rock by Point Load Testing

## A predictive model for uniaxial compressive strength of

compressive strength and Schmidt hardness from the samples of gypsum. Yasar and Erdogan [12] investigated the statistical relationship between hardness value and physico-mechanical properties of constructional and cover rocks. They found high correlation values between Schmidt Hammer hardness and uniaxial compressive strength.Онлайн-запрос

## Production of ‘green’ concrete using red gypsum and waste

Two binders, composed primarily of red gypsum and ground granulated blastfurnace slag, were mixed with sand and pea gravel to make 100 mm concrete cubes and compared with Portland cement for uniaxial compressive strength, stiffness and workability.Онлайн-запрос

## The tensile and compressive strength of plaster and stone

The tensile and compressive strength of plaster and stone. R. Earnshaw. Corresponding Author. Uniaxial compression tests and the validity of indirect tensile strength, The effects of a liquid dispersing agent and a microcrystalline additive on the physical properties of type IV gypsum, The Journal of Prosthetic Dentistry, 10.1016/0022

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