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Thursday, 17 October 2019
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Raw materials & technologies, Technologies

Portland cement paste with aligned carbon fibers exhibits high flexural strength

Friday, 14 October 2016

Researchers from University of Augsburg introduce a nozzle injection technique for carbon fiber-reinforced cement paste leading to unidirectional alignment of cement-embedded short carbon fibers that follow the movement direction of the guided nozzle.

Portland cement paste with aligned carbon fibers. Source: IfP/University of Augsburg

Portland cement paste with aligned carbon fibers. Source: IfP/University of Augsburg

In comparison to non-reinforced cement pastes, this novel material exhibits a tremendous increase of its flexural strength upon admixing and aligning 1 to 3 percent (by volume) of chopped carbon fibers.

Material exhibits increase of flexural strength

Cement pastes containing carbon fibers aligned in the stress direction thus acquire high compressive and flexural strength values at the same time. Mechanical tests prove the material to withstand flexural loads larger than 100 MPa in conjunction with a deflection hardening behaviour resembling that of high performance fiber-reinforced cementious composites at relatively low fiber volume content. Insights into the preparation, fiber alignment, rheology and the fracture behaviour of this material are presented.

The study is published in: Cement and Concrete Research, Volume 89, November 2016, Pages 80–86

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