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The Point Load strength test is based on the indirect tensile strength test or rock core by fracturing a specimen of rock using a machine equipped with conical platens and a load measuring system. the test provides a Point Load Strength (I
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3.2 POINT LOAD TEST (PLT) The Point Load Test is also known as the Franklin test. The first reference is by Reichmuth D. (1968) 10 who proposed obtaining the resistance to a point load and a determination of the unconfined compression strength via correlation regardless of whether they are irregular regular or cylindrical rock
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Point load test (PLT) The Point load test is an index test by which the rock is classified according to the strength. The test can be used to estimate other characteristics of intact rocks with which it correlates such as uniaxial compressive and tensile strength. The test determines the strength index values at a point (Is (50)) and the
Learn MoreGeotechnical logging techniquesQueensMineDesignWiki
Core logging procedure. The following steps are suggested during the core logging process Clean the core of drilling fluids or mud. Mark major structures proposed point load testing locations and
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Feb 05 2017 · Demostration and Installation of point load Index Tester from India. Brand GTEK Expert of Civil Laboratory Equipments.
Learn MoreFIELD PROCEDURES MANUAL Geotechnical Data Collection
logging procedure for oriented drill core is described in Appendix A. 2.1.5 Point Load Test Data Point load tests (PLT) are done on either random intervals for calibration of rock hardness as described in Section 2.1.3 or at regular intervals. The PLT results can be calibrated by laboratory unconfined compressive strength (UCS) test.
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• Locate review standard lab testing procedures for indexing parameters of strength stiffness and durability. • Select reppp gresentative specimens for testing • Measure force (P) to crunch intact rock specimen • Point Load Index I s = P/d e 2 where d e = equivalent core
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The Point Load Test is primarily an index test for strength classification of rock materials. This instrument is mainly intended for field measurements on rock specimens but it can also be used in the laboratory. The results of the test may also be used to predict the uniaxial compressive strength of rock
Learn MoreRock failure modes under uniaxial compression Brazilian
Nov 16 2013 · Rock failure is a serious problem in rock engineering environments. Rock failure modes however are complex and difficult to quantify or predict. A comprehensive study on rock failure
Learn MoreStandard Test Method for Determination of the Point Load
This standard is issued under the fixed designation D 5731 the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision. A number in parentheses indicates the year of
Learn MorePoint Load TesterConstruction Materials Testing Equipment
This apparatus is used to determine the strength values of a rock specimen both in the field and in the laboratory. It consists of a load frame for applying loads up to 55kN a mounted hydraulic ram and a pressure gauge with 0.001kN precision for maximum load indication.
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In a Point Load Test a sample of rock is mounted between two pointed plates and pressure is applied until failure of the sample occurs. The peak applied load is recorded. This is repeated on a minimum of 20 ideally 50 pieces of rock within a sample with the results used to calculate the Point Load Index.
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The Proctor compaction test is a laboratory method of experimentally determining the optimal moisture content at which a given soil type will become most dense and achieve its maximum dry density.The test
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This test method specifies the apparatus instrumentation and procedures for determining unconfined compressive strength of intact rock core specimens. This procedure is identical to ASTM D 2938 except that the cores are tested after cutting without grinding and neoprene caps are used on the specimen ends. Unconfined Compressive Strength Test Procedure
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Comparison of Averaging Procedures for Point Load Testing of Rock. This paper presents experimental results of a laboratory point load testing program conducted to analyze the effect of 2 different point load mean value calculation procedures on the prediction accuracy of uniaxial compressive strength of rocks.
Learn MoreSTANDARD OPERATING PROCEDURE No. 77 POINT LOAD
The sample for the Point Load test should be defined as a set of rock specimens of similar strength for which single Point Load Strength value is to be determined.
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Concrete testing using a point load tester recommends that a minimum ratio of core diameter to maximum aggregate size of 4 be used.5This ratio may be used until guidelines are developed for rock.
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Nov 22 2019 · Rebound Hammer Test The Schmidt rebound hammer is principally a surface hardness tester with little apparent theoretical relationship between the strength of concrete and the rebound number of WEATHERING OF ROCK MASS Weathering is the process of alteration and breakdown of rock
Learn MoreFIELD PROCEDURES MANUAL Geotechnical Data Collection
logging procedure for oriented drill core is described in Appendix A. 2.1.5 Point Load Test Data Point load tests (PLT) are done on either random intervals for calibration of rock hardness as described in Section 2.1.3 or at regular intervals. The PLT results can be calibrated by laboratory unconfined compressive strength (UCS) test.
Learn More(PDF) The point-load strength testResearchGate
The Point Load Index is a geomechanical test used to measure rock fragment strength (Broch and Franklin 1972) and has been correlated with rock mass parameters like
Learn More(PDF) Evaluation of Compression Load Test Interpretation
An extensive evaluation of capacity interpretation criteria is presented for driven Precast Concrete (PC) piles under axial compression loading. A database of static load tests for round and square cross
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The Point Load Test also known as the Point Load Strength Index Test is used to calculate the rock strength index of a rock specimen. From the rock strength index other rock parameters such as the uniaxial compressive strength can be estimated.
Learn MoreSTRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1
Broch and Franklin (1972) proposed a testing method called the Point Load Test. The test consists of squeezing pieces of rock diametrically between two hardened steel cones. The test set-up is shown in Figure 1. For these tests rock pieces must have a length at least 1.4 times their diameter (Figure 2a). The point load index Id is equal to
Learn MoreUnconfined Compressive Strength Test of Rock
This test method specifies the apparatus instrumentation and procedures for determining unconfined compressive strength of intact rock core specimens. This procedure is identical to ASTM D 2938 except that the cores are tested after cutting without grinding and neoprene caps are used on the specimen ends. Unconfined Compressive Strength Test Procedure Check the ability of the spherical seat
Learn MoreUniaxial Compressive Strengthan overview
Uniaxial compressive strength (UCS) is a key physical test relevant to iron ore crusher design and rock geomechanics for mining. Tests are typically performed on intact lengths of NQ HQ or PQ diamond drill core and record the maximum axial load sustained at the point
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Point Load Test (ASTM / ISRM 2007 In-house Technical Procedure TP35) £ 7.00 per determination Point Load Test (set of 10 individual determinations on one rock core or rock stick sample) (ASTM / ISRM 2007 In-house Technical Procedure TP35) £ 50.00 per sample Moisture Content
Learn MorePRACTICAL HARDNESS TESTING MADE SIMPLE
calibrated load cells or other specialized instruments. During normal operation one must perform as required by Recommended Practices a daily hardness check on a Reference Block of known hardness. This is an indirect verification to ensure that the testing
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The Point-load Test measures the Point Load Strength Index (Is(50)) of rock specimens and their Strength Anisotropy Index (Ia(50)) which is the ratio of Point Load Strengths in directions that give the greatest and least values. Rock specimens in the form of core (diametral and axial tests) cut blocks (block test
Learn MoreIS 1121-1 (1974) Methods of test for determination of
NOTf4 --Test pieces prepared out of broken beams in the transverse test (see IS 1121 (Part Il)-1974 1mayalso be used. 3.1.2 The load-bearingsurfaces shall be finished to as nearly true parallel and perpendicular planes as possible by using rock
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Jun 28 2018 · • Test can be conducted on dry or 2 days soaked specimens. • Point load Index Is= P/ D2 • Anisotropic specimen test along and across the bedding plane Type of rock Point Load index Is (Mpa) Dolomite 6-11 Limestone 0.25-8 Shale 0.2-8 Volcanic rocks 3-15 Ms. Anjana R Menon Asst.Prof. Dept of Civil Engg 29.
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