Tensile Strength of Compacted Clays

Heibrock, G.; Zeh, Rainer M.; Witt, Karl Josef

doi:10.1007/3-540-26736-0_30

Cited by 14 publications

(12 citation statements)

References 7 publications

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“…Several designs of jaws/platens have been proposed by previous authors including internally or externally glued fixings (Heibrock et al, 2005) and friction based designs such as truncated cylinders (Tamrakar et al, 2005) and truncated triangular prisms (Rodriguez, 2002;Kim and Hwang 2003;Trabelsi et al, 2012). In order to induce tension, a pair of loading jaws was designed between which the soil specimen is mounted.…”

Section: Direct Tensile Testingmentioning

confidence: 99%

“…compression) such that the specimen fails in tension. Direct tests include modification of triaxial testing apparatus (Tang and Graham, 2000;Heibrock et al,2005;Zeh and Witt, 2007) and modification of direct shear testing apparatus (Nahlawi et al, 2004;Tamrakar et al, 2005;Trabelsi et al, 2012). Indirect tests include the Brazilian tensile test (Frydman, 1964;Krishnayya and Einsenstein, 1974), Hollow Cylinder Triaxial test (Alsayed, 2002) and beam bending (Thusyanthan et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Tensile behaviour of unsaturated compacted clay soils — A direct assessment method

Stirling

Hughes

Davie

et al. 2015

Applied Clay Science

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractThis paper presents a new method for testing the behaviour of soils placed under tensile load and demonstrates its suitability for testing a number of soil types under various conditions including saturation, compaction and stabilisation. Validation of the results obtained for the soils at relatively low saturation has been conducted using the established Brazilian (indirect) test for measuring the tensile strength of brittle materials. A fair comparison has been found and the results highlight the limited applicability of the Brazilian method to soils at very low water contents at which the tensile failure criterion has been assumed using this methodology. Optical characterisation of the performance of both testing methods has also been conducted using Digital Image Correlation. The consistent, accurate measurement of directly induced tensile strains using the proposed new method has been confirmed, verifying its capability to apply a direct tensile stress in the absence of shearing, a problem commonly associated with other tensile testing methods. The developed technique has then been used to investigate the water content -tensile strength relationship for compacted, unsaturated soils and offers significant advantages in the characterisation of clay soils subjected to variable climatic loading.

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Section: Direct Tensile Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tensile behaviour of unsaturated compacted clay soils — A direct assessment method

Stirling

Hughes

Davie

et al. 2015

Applied Clay Science

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“…1). The addition of fiber alone to clay had a detrimental effect on the tensile strength enhancement at 600 gm/m 3 . These values further reduced at 900 gm/m 3 dosage but however, slight increase is seen at 1200 gm/m 3 as seen from Fig.…”

Section: Resultsmentioning

confidence: 94%

“…Fang and Fernandez [2] presented a method for measuring tensile strength of soils. This test became popular and many versions were later introduced to measure the tensile strength indirectly [3]. The procedure is standardized by the ASTM D3967-08 [4] and suggested by the International Society for Rock Mechanics in 1981 [5].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Tensile Strength in Clays Using Polypropylene Fibers

Dafalla¹,

Moghal²,

Al-Obaid³

2017

geomate

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ABSTRACT:The geotextile industry research and development is growing at a fast rate and new products of variable specifications are now available for earthworks and design engineers. The polypropylene fiber material is non-biodegradable which can stand aggressive chemical exposure when placed along with soil media. This research is conducted on a polypropylene fiber reinforced soil treated with chemical admixture in order to study the interlocking mechanism and to study the extent of improvement on their tensile behaviour. Locally available plastic clay was selected for this investigation. The extent of improvement by the polypropylene fibres inclusion on the tensile behaviour was evaluated by carrying out a series of Brazilian tensile strength tests. The dominant mechanism responsible for the increase in tensile strength properties has been proposed. The effect of various geotechnical parameters like grain size distribution, density and moisture content on the tensile strength improvement has been discussed. The study shows that the addition of polypropylene fibers alone to highly plastic clay will not suffice the tensile strength requirements. The polypropylene fibers when added with lime of 6% can improve the tensile strength by further 13 to 28% depending on the dose or fiber content.

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“…Following the reasoning of Munkholm and Kay (2002);Heibrock et al (2005);Forsmo et al (2006); Zeh and Witt (2007);Vanicek (2013), capillary force is the major force binding sand grains in moist sand. With increasing water content, the saturation increases.…”

Section: Tensile Strengthmentioning

confidence: 99%

Neutron Radiographic Study of the Effect of Heat-Driven Water Transport on the Tensile Strength of Bentonite-Bonded Moulding Sand

et al. 2017

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Wet tensile testing is a common method to assess the stability of bentonite-bonded moulding sands. For wet tensile testing, a specimen is first heated from above in order to simulate heat-driven moisture transport induced by the casting process. Then, tensile stress is applied until rupture. In this study, neutron radiography imaging was applied to moulding sands in situ during heating and wet tensile testing in order to investigate the effects of water kinematics on the tensile strength. Neutron radiography allowed the localization of the rupture plane and the quantitative determination of the local water content with sub-mm resolution. Quantification of the temperature at the rupture plane and of the heat kinematics within the specimen was accomplished by temperature measurements both in situ and ex situ. In this way, experimental data correlating the wet tensile strength with the specific conditions of moulding sands at the rupture plane were obtained for the first time. that the weakest location within a sand profile can be pinpointed at the interface between evaporation and condensation zone (i.e. at the 100 • C isotherm), where water vaporization starts and the water bridges connecting the sand grains collapse. This weakest location has maximum strength, if the local water content at the rupture plane is between 5 and 9 wt.%. Less water leads to a strong decrease of wet tensile strength. More water requires an initial water content above 5 wt.%, which leads to a decrease of the tensile strength of the unheated sand.

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Tensile Strength of Compacted Clays

Cited by 14 publications

References 7 publications

Tensile behaviour of unsaturated compacted clay soils — A direct assessment method

Tensile behaviour of unsaturated compacted clay soils — A direct assessment method

Enhancing Tensile Strength in Clays Using Polypropylene Fibers

Neutron Radiographic Study of the Effect of Heat-Driven Water Transport on the Tensile Strength of Bentonite-Bonded Moulding Sand

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