Microstructure of steel fiber reinforced polymer-cement-based composites

Abstract

Mercury intrusion porosimetry was used to measure the pore structure of steel fiber reinforced polymer-cement-based composite. The results indicate that the large pore volume decreases by 57.8%–51.2% and by 87.1%–88% with the addition of steel fibers and polymers respectively. When both steel fibers and polymers are simultaneously added, the large pore volume decreases by 88.3%–90.1%. As a surface active material, polymer has a favorable water-reduced and forming-film effect, which is contributed to the decrease of the thickness of water film and the improvement of the conglutination between the fibers and the matrix. Polymers could form a microstructure network. This network structure and the bone structure of cement hydration products penetrate each other and thus the interpenetrating network with sticky aggregate and steel fiber inside forms.

Keywords

pore structure / steel fiber / polymer / composite / microstructure

References

[1] P Soroushian, C D Lee. Distribution and Orientation of Fibers in Steel Fibers Reinforced Concrete,ACI Materials Journal, 1991, Sept.–Oct

[2] Toutanji H, Bayasi Z. Effects of Manufacturing Techniques on the Flexural Behavior of Steel Fiber-reinforced Concrete. Cement and Concrete Research, 1998, 28(1): 115-124.

[3] Naixing Liang. Effects of SBR on the Microstructure Hydration Process of Cement. Journal of Chinese Ceramics Society, 1994, 22(4): 340-346.

[4] A C Raymond and K C Hover. Merry Porosimetry of Cement-based Materials and Associated Correction Factors.ACI Materials Journal, 1993, March–April: 152–161