CURRENT COGNITION OF ROCK TENSILE STRENGTH TESTING BY BRAZILIAN TEST

Asphalt aging is one of the main factors causing asphalt pavements deterioration. Previous studies reported on some aging benefits of asphalt rubber mixtures through laboratory evaluation. A field observation of various pavement sections of crumb rubber modified asphalt friction courses (ARFC) in the Phoenix, Arizona area indicated an interesting pattern of transverse/reflective cracking. These ARFC courses were placed several years ago on existing jointed plain concrete pavements for highway noise mitigation. Over the years, the shoulders had very noticeable and extensive cracking over the joints; however, the driving lanes of the pavement showed less cracking formation in severity and extent. The issue with this phenomenon is that widely adopted theories that stem from continuum mechanics of materials and layered mechanics of pavement systems cannot directly explain this phenomenon. One hypothesis could be that traffic loads continually manipulate the pavement over time, which causes some maltenes (oils and resins) compounds absorbed in the crumb rubber particles to migrate out leading to rejuvenation of the mastic in the asphalt mixture. To investigate the validity of such a hypothesis, an experimental laboratory testing was undertaken to condition samples with and without dynamic loads at high temperatures. This was followed by creep compliance and indirect tensile strength testing. The results showed the higher creep for samples aged with dynamic loading compared to those aged without loading. Higher creep compliance was attributed to higher flexibility of samples due to the rejuvenation of the maltenes. This was also supported by the higher fracture energy results obtained for samples conditioned with dynamic loading from indirect tensile strength testing.

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Effects of Thermal Treatment on Tensile Strength of Laurentian Granite Using Brazilian Test

Rock Mechanics and Rock Engineering ◽

10.1007/s00603-015-0712-3 ◽

2015 ◽

Vol 48 (6) ◽

pp. 2213-2223 ◽

Cited By ~ 71

Author(s):

Tubing Yin ◽

Xibing Li ◽

Wenzhuo Cao ◽

Kaiwen Xia

Keyword(s):

Tensile Strength ◽

Thermal Treatment ◽

Brazilian Test

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PENGARUH PENGGUNAAN LIMBAH PLASTIK POLYPROPYLENE (PP) SEBAGAI CAMPURAN AGREGAT KASAR TERHADAP KUAT TEKAN DAN TARIK PADA BETON FC’ 25 MPA

Jurnal Infrastruktur ◽

10.35814/infrastruktur.v3i2.706 ◽

2019 ◽

Vol 3 (2) ◽

pp. 81-89

Author(s):

Angga Pirman Firdaus ◽

Jonbi

Keyword(s):

Tensile Strength ◽

Compressive Strength ◽

Strength Test ◽

Plastic Waste ◽

Concrete Mixture ◽

Strength Testing ◽

Concrete Compressive Strength ◽

Tensile Strength Test ◽

Compressive Strength Test ◽

Waste Mixture

Indonesia ranks second in the world's largest plastic waste producer after China. Each year, Indonesia can contributeup to 187.2 million tons of plastic waste, while China reaches 262.9 million tons of plastic waste. Based on the data, one way to utilize plastic waste by using plastic waste as a mixture of concrete, where the plastic used is polypropylene (PP) plastic with different percentage of concrete mixture, the test includes compressive strength test and tensile concrete. The results of concrete compressive strength testing with polypropylene (PP) plastic waste mixture of 5%, 10% and 15% at age 28 in aggregate aggregate mixture decreased by 5.15%, 6.89% and 13.53%. As for the result of concrete tensile strength test with polypropylene (PP) plastic waste mixture of 5%, 10% and 15% at age 28 in crude aggregate mixture decreased 17,61%, 24,13% dan 23,24%.

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Promising Role of Calcium Hypochlorite as a Disinfectant: An in vitro Evaluation Regarding its Effect on Type V Dental Stone

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-1242 ◽

2012 ◽

Vol 13 (6) ◽

pp. 856-866

Author(s):

Prasanta Kumar Swain ◽

Sharanbasappa C Nagaral ◽

Pawan Kumar Kamalapurker ◽

Ravishankar Damineni

Keyword(s):

Tensile Strength ◽

Bacillus Subtilis ◽

Deleterious Effect ◽

Strength Testing ◽

Calcium Hypochlorite ◽

Resistant Species ◽

Type V ◽

Mixing Water

ABSTRACT Aim The current study has been chosen to evaluate the efficacy of calcium hypochlorite as a disinfecting additive for the gypsum products and its effect on compressive and tensile strength of the set material. It is hypothesized that, the addition of calcium hypochlorite to type V dental stone in sufficient quantity to disinfect the material would have no deleterious effect on compressive or tensile strength. Materials and methods Total of 160 samples made up of type V dental stone were divided broadly into two groups of 80 samples each for the sake of compressive and tensile strength testing in dry and wet conditions: Out of each group, 10 samples without addition of any disinfectant (0% calcium hypochlorite) was compared with other group of 30 samples after adding disinfectant, i.e. each subgroup containing 10 samples each (0.5, 1.0 and 1.5% calcium hypochlorite). Conclusion Within limitations of this in vitro study it is assumed to prepare type V dental stone that contains a disinfectant, has adequate compressive strength and tensile strength, and can significantly act against a resistant species like Bacillus subtilis. Clinical significance When calcium hypochlorite was added to dental stone, extra mixing water was required to produce a material of nearly same pouring consistency. The samples, which were put to microbiological tests, showed effective action of disinfectant on Bacillus subtilis. No deleterious effect on compressive or tensile strength could be found after putting the selected samples with calcium hypochlorite. How to cite this article Swain PK, Nagaral SC, Kamalapurker PK, Damineni R. Promising Role of Calcium Hypochlorite as a Disinfectant: An in vitro Evaluation Regarding its Effect on Type V Dental Stone. J Contemp Dent Pract 2012;13(6):856-866.

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TENSILE STRENGTH TESTING AND QUALITY CONTROL PROCEDURES FOR AROMATIC POLYAMIDE YARNS

TEQC83 ◽

10.1016/b978-0-408-22162-7.50018-x ◽

1983 ◽

pp. 137-144 ◽

Cited By ~ 2

Author(s):

J Cook

Keyword(s):

Quality Control ◽

Tensile Strength ◽

Aromatic Polyamide ◽

Strength Testing ◽

Control Procedures

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Bonding of plywood

Research in Agricultural Engineering ◽

10.17221/39/2015-rae ◽

2016 ◽

Vol 62 (No. 4) ◽

pp. 198-204

Author(s):

M. Brožek

Keyword(s):

Tensile Strength ◽

Testing Machine ◽

Strength Testing ◽

Bonded Joints ◽

Rupture Force ◽

Oblique Direction ◽

Direction Angle ◽

Economical Evaluation ◽

Wood Bonding ◽

Strength Tests

The contribution contains results of bonded joints strength tests. The tests were carried out according to the modified standard ČSN EN 1465 (66 8510):2009. The spruce three-ply wood of 4 mm thickness was used for bonding according to ČSN EN 636 (49 2419):2013. The test samples of 100 × 25 mm size were cut out from a semi-product of 2,440 × 1,220 mm size in the direction of its longer side (angle 0°), in the oblique direction (angle 45°) and in the direction of its shorter side (crosswise – angle 90°). The bonding was carried out using eight different domestic as well as foreign adhesives according to the technology prescribed by the producer. All used adhesives were designated for wood bonding. At the bonding the consumption of the adhesive was determined. After curing, the bonded assemblies were loaded using a universal tensile-strength testing machine up to the rupture. The rupture force and the rupture type were registered. Finally, the technical-economical evaluation of the experiments was carried out.

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Numerical Simulation on Failure Patterns of Rock Discs and Rings Subject to Diametral Line Loads

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.261-263.1517 ◽

2004 ◽

Vol 261-263 ◽

pp. 1517-1522 ◽

Cited By ~ 3

Author(s):

Wan Cheng Zhu ◽

K.T. Chau ◽

Chun An Tang

Keyword(s):

Tensile Strength ◽

Standardized Test ◽

Process Analysis ◽

Failure Process ◽

Brazilian Test ◽

Rock Failure ◽

Numerical Code ◽

Failure Patterns ◽

Rock Failure Process ◽

Indirect Tensile

Brazilian test is a standardized test for measuring indirect tensile strength of rock and concrete disc (or cylinder). Similar test called indirect tensile test has also been used for other geomaterials. Although splitting of the disc into two halves is the expected failure mode, other rupture modes had also been observed. More importantly, the splitting tensile strength of rock can vary significantly with the specimen geometry and loading condition. In this study, a numerical code called RFPA2D (abbreviated from Rock Failure Process Analysis) is used to simulate the failure process of disc and ring specimens subject to Brazilian test. The failure patterns and splitting tensile strengths of specimens with different size and loading-strip-width are simulated and compared with existing experimental results. In addition, two distinct failure patterns observed in ring tests have been simulated using RFPA2D and thus this verifies the applicability of RFPA2D in simulating rock failure process under static loads.

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