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Development Of Drying Crack Networks In Slurries With Different Thicknesses | 76316
ISSN: 2157-7617

Journal of Earth Science & Climatic Change
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Development of drying crack networks in slurries with different thicknesses

4th World Conference on CLIMATE CHANGE

Yue Zhang and Wm Ye

Tongji University, China

ScientificTracks Abstracts: J Earth Sci Clim Change

DOI: 10.4172/2157-7617-C1-036

Abstract
Statement of the Problem: As one of the dominant climate-related hazardsall over the world, drought occurs more frequently and widely in recent years.Especially in the field of geotechnical engineering, such extreme condition could trigger intense shrinkage cracking of soils,leading toirrecoverable damageforbothmodern infrastructures and ancient earthen heritages. For a drying soil, previous researchers mainly focused onfinal morphology of crack pattern influenced byambient temperature, RH and mineral types etc.However,the wholeprocess of crack network development is far less investigated,particularly in a quantitative way. Material & Methodology: Slurries with different initial thicknesses (2, 5, 10 and 15mm)were preparedin circular containers, from low-plastic silty clay with water content 45%.Specimens were exposed to air drying in a laboratory undercontrolledtemperature 20±1oC. During desiccation, the evolving crack networks were recorded regularly using a digital camera and further analyzed resorting to image processing technique. Three geometric parameters, i.e. CIF(crack intensity factor), total crack length (L) and average crack width (W), were quantified. Findings: As water content dropped below the liquid limit30%, cracks started to initiate on soil surface. Both L and W increased gradually in the following stage, however, the evolution trend was different among specimens.For 15mm slurry,Lstopped increasing at air-entry water content (22%),while W kept growing until shrinkage limit (16%) was reached.In comparison,2mm slurry was dominated by elongationof cracks, accompanied by only slight widening.In addition, CIF increased from 5.26% to 10.32% as thickness increased. Crack patterncut extensively by small and narrow cracks transformed gradually into less fragmented one. Conclusion & Significance: Thicknesshad a great impact onboth development and final morphology of drying cracking networks. This providessome useful information for understanding the mechanisms in practical issues.
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