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An examination of the mechanical interaction of drilling slurries at the soil-concrete contact

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第4期11卷 294-304页

作者： Ressol R.SHAKIR Key Laboratory of MOE for Geomechanics and Embankment Engineering Hohai University Geotechnical Research Institute Hohai University

Evidence gained from previous field tests conducted on drilled shaft foundation shows that using drilling slurries to stabilize a borehole during the construction may influence the interfacial shear *** paper deals with an exhaustive study of the effects of drilling slurries at the contact between soil and *** study involved adapting a simple shear apparatus and performing approximately 100 experimental tests on the interaction between two types of soils;clay and sandy clay and five specimens of concrete with different surface *** also involved using bentonite and polymer slurries as an interface layer between soil and *** showed that an interface layer of bentonite slurry between clay and concrete decreases the interfacial shear strength by 23% and as an interface layer between sandy clay and concrete,bentonite increases interfacial shear strength by 10%.Using polymer slurry as an interface layer between clay and concrete decreases the interfacial shear strength by 17% while using it as an interface layer between sandy clay and concrete increases the interfacial shear strength by 10%.Furthermore,the data show that using bentonite and polymer slurry as an interface layer between clay and concrete decreases the sliding ratio by 50% to 60%,while increasing the sliding ratio by 44% to 56% when these are used as an interface layer between sandy clay and concrete.

关键词： Drilled shaft foundation Drilling slurry Polymer Bentonite Simple shear test concrete surface Soil structure interaction Mudcake

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Influence of ＂Covercrete＂ Morphology on Durability Properties

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Journal of Civil Engineering and Architecture 2012年第7期6卷 928-932页

作者： Pavel Reiterman Karel Kolar Michaela Dudikova Petr Konvalinka Faculty of Civil Engineering Czech Technical University in Prague Prague 16629 Czech Republic Klokner Institute Czech Technical University in Prague Prague 16629 Czech Republic

Many leading experts agree on the importance of monitoring the ＂concrete skin＂ as the most loaded area affected by the external environment. Surfacing, concrete mixture composition and curing are of great importance for the concrete surface resistance. The paper introduces an experimental program focused on the monitoring of de-icing salts resistance, depending on surface roughness. Quantitative evaluation of the concrete surface was performed by using confocal laser scanning microscopy, which is the new generation of optical systems that are able to make all measurements in 3D resolution. These measurements are supplemented by results of mechanical and absorption tests.

关键词： Confocal microscopy concrete surface durability.

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