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Study regarding the optimization of the mechanical behaviour of glass fibre reinforced concrete

E. MARIN1, M. BARBUTA1, L. CIOBANU1,* , S. D. IONESI1, I. CIOARA1, C. DUMITRAS1,*

Affiliation

  1. Technical University”Gheorghe Asachi” of Iasi, Romania

Abstract

The use of fibre reinforced concrete is well documented and the advantages of such materials in civil engineering refer to improved mechanical strength, improved concrete ductility and increased durability. The literature presents numerous studies concerning the subject. Some of them reveal the ecological trend of replacing cement with waste by-products such as silica, fly ash and slag. In this context it is of interest to study how the fibre reinforcement contributes to the mechanical behaviour of these recyclable composites. It is also important to see how the fibre characteristics affect the mechanical properties of the concrete. The paper presents an optimization study that considers the fibre length and the fibre percentage in the mix as independent variables. The output variable is the flexural strength. The experiment was carried out according to the experimental matrix and the data was processed using DOE++. A mathematical model for the flexural strength was obtained based on the ANOVA analysis. The model was validated. The response surfaces indicate that the optimum areas (maximum flexural strength) correspond to the maximum values of the input variables. The position of the area of maximum in the response surfaces indicate that the output variable can be further increased. Due to processing problems related especially with the percentage of fibres in the mix, only the fibre length was increased, while maintaining the fibre percentage to 1%. The results confirm the improvement of the flexural strength over the limit suggested by the experimental matrix..

Keywords

Fibre reinforced concrete, Fly ash, Fibre characteristics, Flexural strength, and optimization.

Submitted at: June 23, 2014
Accepted at: Nov. 13, 2014

Citation

E. MARIN, M. BARBUTA, L. CIOBANU, S. D. IONESI, I. CIOARA, C. DUMITRAS, Study regarding the optimization of the mechanical behaviour of glass fibre reinforced concrete, Journal of Optoelectronics and Advanced Materials Vol. 16, Iss. 11-12, pp. 1411-1417 (2014)