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Polymers 2018, 10(8), 924;

An Experimental Study on the Shear Behaviors of Polymer-Sand Composite Materials after Immersion

School of Earth Sciences and Engineering, Hohai University, Nanjing 210098, China
Council of Scientific and Industrial Research (CSIR)-Central Building Research Institute (CBRI), Roorkee 247667, India
Author to whom correspondence should be addressed.
Received: 26 July 2018 / Revised: 12 August 2018 / Accepted: 14 August 2018 / Published: 18 August 2018
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Sand mixed with geotextile/fiber/cement/lime or non-traditional chemical additives to form composite materials is recognized as an effective method for improving the sand properties. In this work, the variation in properties of composite materials after immersion is reported which has rarely appeared in the literature. The focus of this study is to evaluate the shear behaviors of polymer-sand composite material after immersion with direct shear tests. Several factors which may influence the shear behaviors after immersion are analyzed. The results demonstrate that this composite material still has good shear behaviors after immersion when compared to the purely sand material. The shear behaviors are improved with an increment in the curing time, polymer content and sand dry density while there is a decrease in the shear behaviors with increasing immersion time. The interaction between sand particles and the polymer are analyzed with Scanning Electron Microscope (SEM). The polymer membranes are formed by polymer enwrapping and connected sand particles to build an elastic and viscous structure in the sand that increases the interlocking forces between sand particles and decreases the void ratio of this material. The membranes are softened in water resulting in a decrease in the shear strength. Moreover, other factors affect the shear behaviors by improving the completeness and stability of this structure. View Full-Text
Keywords: polymers; sand; composite materials; shear behavior; immersion polymers; sand; composite materials; shear behavior; immersion

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Liu, J.; Bai, Y.; Li, D.; Wang, Q.; Qian, W.; Wang, Y.; Kanungo, D.P.; Wei, J. An Experimental Study on the Shear Behaviors of Polymer-Sand Composite Materials after Immersion. Polymers 2018, 10, 924.

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