Experimental Investigation on the Effects of Microwave
Strength reduction during microwave fracturing of basalt is driven by heat from enstatite (a microwave-sensitive mineral) and volumetric expansion of olivine (a thermally expansive mineral). Uniaxial compressive, Brazilian tensile, and point load strengths all decreased with increasing microwave irradiation time at rates that were …
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An investigation into the influence of microwave
The dynamic mechanical properties of basalt affected by microwave were investigated by performing dynamic compressive tests using the SHPB system. Meanwhile, the thermal damage of the treated basalt was characterized by ultrasonic non-destructive testing and nuclear magnetic resonance technology.
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Empirical models for compressive and tensile …
To determine the compressive strength (CS) and tensile strength (TS) of basalt fiber reinforced concrete (BFRC), this study will develop empirical models using …
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Experimental Study on Basic Mechanical Properties …
The enhancing effect of the basalt fiber on the compressive strength of concrete is lower than that of tensile strength and flexural strength. Moreover, the …
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(PDF) The point-load strength test
Conversely, the relationship between rebound strength and uniaxial compressive strength is described by y=1.26x-7.39, with a correlation coefficient of 0.76, slightly lower than the point load.
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Genesis and evolution of kimberlites
Key points. Kimberlite rocks are unlike kimberlite melts, owing to entrainment and assimilation of mantle and crustal fragments, fluid loss during ascent and …
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Uniaxial compressive strength ( c) and deformation …
Uniaxial compressive strength ( ... Basalt 145 50 347 25 207 82 395 3 (17) Diabase, dolerite 229 88 384 13 152 81 537 5 15.2 Hyperite - - - - 245 108 441 2 ure Graywacke 81 25 310 12 - - - - Sandstone 109 28 257 95 147 28 189 5 18.8 Siltstone 89 31 350 14 - - - - 9.6 ...
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(PDF) The effects of microwave irradiation on …
The unconfined compressive strength (UCS) and Brazilian tensile strength (BTS) were significantly reduced by microwave irradiation. The tests showed that Cerchar …
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The rock mechanics of kimberlite volcanic pipe …
At intermediate (> 1000 m) to deep (> 2500 m) depths, the increasing compressive stress can cause fractures to develop around an excavation. Stress-induced fractures should cause scaling of a volcanic pipe's sidewalls and expansion perpendicular …
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Compressive strength prediction of basalt fiber …
First, the compressive strength tests of BFRC under different stress states were performed at fiber volume fractions of 0.2%, 0.4%, 0.6% and fiber lengths of 6 mm, …
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Canadian kimberlites: Geological characteristics relevant to
The results indicate that the mechanical properties including unconfined compressive strength (UCS) and Brazilian tensile strength (BTS) were significantly dropped as a result of MW irradiation. ... The host magmas are often low viscosity in nature and range from basalt to more esoteric compositions such as kimberlite, nephelinite and …
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Investigating microwave assisted rock breakage for …
The preliminary experimental results showed that the basalt rock samples used were quite susceptible to the exposure of low power microwaves. ... and compressive strength are shown in Table 4. The ...
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The effects of microwave irradiation on …
The unconfined compressive strength (UCS) and Brazilian tensile strength (BTS) were significantly reduced by microwave irradiation. The tests showed that Cerchar Abrasivity …
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Estimating uniaxial compressive strength of rocks using …
Porosity is a significant physical feature of rocks due to water absorption that causes decrease in the strength. The basalt of the study area can be described as "highly porous" and ignimbrite as "extremely porous" according to the classification by Anon (1979).The average UCS of basalt is determined as 26.65 MPa.For the ignimbrite, the …
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compressive strength of kimberlite and basalt
Frontiers. 09 06 2015 Overall axial compressive strength for Pacaya basalt ranges widely from 12 to 174 MPa Table 3 with the lower end falling into strength categories as low as chalk Given that the porosity of the rocks scales with permeability we chose to assess the relationship of UCS with permeability as this measures the strong control that cracks …
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Limits on strength and deformation properties of jointed basaltic …
A study of strength and deformation measurements for basaltic rocks, along with consideration of the influence of fracturing using a rock mass classification system, documents the range of brittle response for basaltic rock masses. Although basalts vary widely in composition and other physical factors, many of the properties of a basaltic rock …
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Experimental investigation on the effects of …
When investigating the strengths of basalt, norite, and granite samples subjected to various MW power levels and exposure times, they discovered that …
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Volumetric expansion coefficients of basalt constituents
Generally, the strength of rocks after microwave irradiation, such as uniaxial compressive strength, tensile strength and triaxial strength, would decrease significantly (Peinsitt et al. 2010 ...
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The rock mechanics of kimberlite volcanic pipe excavation
The JCS is an estimate of the uniaxial compressive strength in megapascals (MPa) of the intact rock defining the walls of the joint plane, that may be weakened by hydrothermal alteration or weathering. ... Lithic blocks and megablocks in the Aries kimberlite include a basalt megaclast 57.5 m in size (Downes et al., 2007).
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(PDF) The effects of microwave irradiation on kimberlite
This project investigates the effect of microwave irradiation on the mechanical strength of specific rock samples such as kimberlite, and associated rocks such as granite, limestone and basalt for ...
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The effects of microwave irradiation on kimberlite and …
irradiation on the mechanical strength of specific rock samples such as kimberlite, and associated rocks such as granite, limestone and basalt for comparison. Given the lack or limited knowledge on kimberlite as well as its effect …
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Uniaxial compressive strength ( c) and deformation …
Uniaxial compressive strength ( ... Basalt 145 50 347 25 207 82 395 3 (17) Diabase, dolerite 229 88 384 13 152 81 537 5 15.2 Hyperite - - - - 245 108 441 2 ure Graywacke 81 …
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Strength and deformation properties of granite, basalt
Ultimate strength versus total vertical strain at failure for basalt tested in unconfined compression at loading rates from 1 to 1.6 x 107 psi/sec-----Loading rate versus total …
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A Guide to Basalt: A Common, Fine-grained, Dark-Colored …
Basalt is a common and widely used, fine-grained, dark-colored mafic volcanic rock. It has mainly calcic plagioclase feldspar and augite. ... Compressive strength: 266±98 MPa ; Thermal conductivity: Poor, ... the chemistry and isotopic geochemistry of inclusions in basalts and other rocks like peridotite, including kimberlite, …
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