Size Effects in Multifilament Glass-Rovings: the Influence of Geometrical Factors on Their Performance in Textile-Reinforced Concrete

Abstract

A set of four commercially available multifilament glass-rovings with 320, 640, 1200, and 2400 tex embedded in concrete was investigated using pull-out tests and scanning electron microscopy. The increasing roving cross-section within this set arose from two geometrical factors, namely the number of filaments and the filament diameter. In general, pull-out loads and the pullout work increase with increasing roving cross-section, while the pull-out stress, the efficacy, and the roving penetration decrease. An attempt to separate the two geometrical factors revealed that an increase in the filament diameter reduced the mechanical performance of a roving to a much greater extent than an increase in the number of filaments. Consequently, effective textiles used for reinforced concrete should be made from a larger number of finer rovings such as the 640 tex rather than 2400 tex rovings.

Keywords

continuous multifilament glass-rovings pull-out behavior scanning electron microscopy size effect textile-reinforced concrete

Get full access to this article

View all access options for this article.

References

Molter, M. , Hegger, J. , Will, N. , Hofmann, D. , Habel, W. , Gutmann, T. , and Basedau, F. , Investigations of Textiles Embedded in Concrete - Evaluation of the Bond Behaviour by Micro Strain Sensors, Materialprüfung 44(5), 194-198 (2002).

Ohno, S. , and Hannant, D.J. , Modeling the Stress-Strain Response of Continuous Fiber Reinforced Cement Composites, ACI Mater. J. 91(3), 306-312 (1994).

Gao, S.L. , Mäder, E. , and Plonka, R. , Coatings for Glass Fibers in a Cementitious Matrix, Acta Mater. 52(16), 4745-4755 (2004).

Schleser, M. , Walk-Laufer, B. , Raupach, M. , and Dilthey, U. , Application of Polymers to Textile-Reinforced Concrete, J. Mater. Civil Eng. 18(5), 670-676 (2006).

Schleser, M. , Weichold, O. , Dilthey, U. , and Möller, M. , Proceedings of the 1st International RILEM Symposium on Textile Reinforced Concrete, Aachen, Germany, pp. 55-65 (2006).

Weichold, O. , and Möller, M. , A Cement-in-poly(vinyl alcohol) Dispersion for Improved Fibre-matrix Adhesion in Continuous Glass-fibre Reinforced Concrete , Adv. Eng. Mater. 9(8), 712-715 (2007).

a) Peled, A., and Bentur, A., Geometrical characteristics and efficiency of textile fabrics for reinforcing cement composites, Cem. Concr. Res. 30(5), 781-790 (2000); b) Peled, A., Sueki, S., and Mobasher, B., Bonding in fabric-cement system: Effects of fabrication methods, Cem. Concr. Res. 36(9), 1661- 1671 (2006); c) Peled, A., Cohen, Z., Pasder, Y., Roye, A., and Gries, T., Influences of textile characteristics on the tensile properties of warp-knitted cement based composites, Cem. Concr. Compos. 30(3), 174-183 (2008).

Bažant, Z.P. , and Desmorat , R. , Size effect in fiber or bar pullout with Interface Softening Slip, J. Eng. Mech . 120(9), 1945-1962 (1994 ).

Brockmann, T. , Mechanical and Fracture Mechanical Properties of Fine Grained Concrete for Textile Reinforced Composites, PhD Thesis, RWTH Aachen, Germany (2005).

10.

Alford, N. McN. , and Birchall , J.D. , Fibre Toughening of MDF Cement, J. Mater. Sci. 20(1), 37-45 (1985).

11.

Raupach, M. , and Brockmann, J. , Development of a Test Method to Investigate the Change between the Bond Behaviour of Glass Filament-yarns and Concrete, In "Proceedings of the International Conference on Composites in Constructions," Porto, Portugal, pp. 293-297 (2001).

12.

Weichold, O. , Development of a Cement-in-polymer Dispersion for Improved Reinforcement-matrix Adhesion, In "Proceedings of the 12th International Congress on Polymers in Concrete," Chuncheon, Korea, pp. 321-329 ( 2007).

13.

Kjellsen, K.O. , Monsoy, A. , Isachsen, K. , and Detwiller, R.J. , Preparation of Flat-polished Specimens for SEM-backscattered Electron Imaging and X-ray Microanalysis - Importance of Epoxy Impregnation, Cem. Concr. Res. 33(4), 611- 616 (2003).

14.

Najm, H. , Naaman, A.E. , Chu, T.J. , and Robertson, R.E. , Effects of Poly(vinyl alcohol) on Fiber Cement Interfaces. 1. Bond Stress-slip Response, Adv. Cem. Based Mater. 1(3), 115- 121 (1994).

15.

Schorn, H. , Ein Verbundmodell für Glasfaserbewehrungen im Beton (an adhesive cross-linkage model for textile glass fibre reinforcement in concrete), Bautechnik 80(3), 174-180 (2003).

16.

Pilkey, W.D. , "Analysis and Design of Elastic Beams," John Wiley & Sons, New York, USA (2002).

17.

Brameshuber, W. , Textile Reinforced Concrete, In "State-of-the-art Report of RILEM Technical Committee 201-TRC," RILEM Publications S.A.R.L., Bagneux, France (2006).