Effect of Glass Powder, Nano Silica, and Steel, Glass and Polypropylene Fibres on Mechanical Properties of Reactive Powder Concrete

Document Type : Research Paper

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Civil Engineer / Headquarters of Roads and Urban Development

Abstract

In this paper, the effect of glass powder, nanosilica, glass fibres and polypropylene fibres on the mechanical properties of reactive powder concrete is studied.
At first, in order to obtain the proper control mix design, the effect of the type, amount and the maximum dimension of the sand, the amount and dimension of the glass powder, and the microsilica to cement ratio on the 7-day compressive strength of the reactive powder concrete was studied. Then, the effect of the glass powder as a substitute for sand and cement, nanosilica as a substitute for the cement, the combination of glass powder and nanosilica as a substitute for the cement, and the use of glass fibres and polypropylene fibres on 7-day and 28-day compressive and flexural strength was studied.
Obtained results showed that adding the glass powder as a substitute of sand reduced the compressive strength by 8.5% and increased the flexural strength by 5%. Replacing the cement with nanosilica increased the compressive and flexural strengths by 4% and 17%, respectively. Adding the combination of nanosilica and glass powder as a substitute of cement increased the compressive strength by 12% but it had not a considerable effect on flexural strength. Adding glass fibres reduced the compressive strength by 6% and increased the flexural strength by 30%. Polypropylene fibres decreased the compressive strength by 12% and increased the flexural strength by 15%.

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