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Laboratory investigation of self-healing properties on geosynthetic clay liners with flaw

Zhang G.-W., Zhang H.-Y., Wang J.-F., Zhou L., Liu P., Jiang X.

Archives of Environmental Protection

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2015

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Vol. 41, no. 1

53--58

EN

The objective of this paper is to evaluate the self- healing properties of a commercially-available geosynthetic clay liner (GCL) using flexible-wall permeameter. The GCLs are produced by the same factory, but the contents of bentonite are different. Also the hydraulic conductivities (HC) of GCLs with no defect are different. In this study, specimens were completely saturated under the backpressure of 20 kPa before the test. Permeability tests were performed on GCL specimens with penet rating flaw and also on specimens permeated with distilled water and CaCl2 solutions. The test results were presented and discussed. Experimental results showed that the GCL with penetrating flaw did not exhibit complete self-healing in the case of flaw. After 120 days, the hydraulic conductivity increased by approximately an order of magnitude. In addition, CaCl2 solutions had a significant influence on the hydraulic conductivity. The research findings might be of interest to researchers and engineers who design liners for landfills and other liquid containment facilities.

2

Integration of heterogeneous web services in exceptional situations

Kaczmarek L.

Foundations of Computing and Decision Sciences

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2011

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Vol. 36, No. 3-4

219-228

EN

Web services are intended to enable interoperability between heterogeneous distributed systems. Although the technology has been widely adopted and accepted, there are still differences between runtime platforms in exception structure and handling. This results in difficulties in effective handling of exceptions during Web services invocation. The paper presents a solution that enables coordinated exception handling between different environments, which involves communication between the client and server to exchange exceptional information and invocation of defined handling functions. The functions are supplied by dedicated libraries that extend heterogeneous runtime platforms. Additionally, IDE environments are augmented with facilities for development of Web services exception processing code. An implementation of the solution for IBM WebSphere Application Server and Microsoft Internet Information Server is presented

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Routes and mechanisms towards self healing behaviour in engineering materials

Zwaag S.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2010

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Vol. 58, nr 2

227-236

EN

Modern man-made engineering materials demonstrate excellent mechanical properties, but the lack of the ability of self healing, i.e. the ability to remove or neutralise microcracks without (much) intentional human interaction, which is typical for most materials as encountered in nature. Such self-healing behaviour requires the presence of mobile species, atoms or molecules, in an otherwise solid material. Upon the occurrence of damage the mobile species directionally flow towards the damage location and once arrived there restores the contact between the two crack faces and the mechanical integrity. This directional flow may occur during regular use conditions (self healing behaviour) or conditions during which the mobility is temporarily increased (stimulated self healing). In this manuscript a brief overview of the routes and mechanisms which have been used to create self healing behaviour in the principal classes of engineering materials: polymers, metals, ceramics, concrete, asphalt, fibre composites, is presented.