Abstract
The aim of this work is to describe bonding properties between surface treated polymer fibers and a cement matrix. In order to increase an interaction between the matrix and fiber surfaces, two fiber types having approx. 0.5 mm in diameter were modified by mean of oxygen plasma treatment. Surface physical changes of treated fibers were examined using SEM morphology observation and interfacial adhesion mechanical tests. The principle of mechanical tests rested on a single fiber pulling out from the matrix (cement paste, CEM I 42.5 R, w/c 0.4). The embedded length was equal to 50 % of original fiber length (50 mm), where the fiber free-end displacement and force resisting to the displacement were monitored. It was pointed out that interfacial shear stress needed to break the bond between the modified fibers and the matrix increased almost by 15–65 % if compared to reference fibers. When the fiber free-end displacement reached to 3.5 mm, the shear strength increased almost twice.
Highlights
A fiber-reinforced concrete (FRC) is a composite material containing fibers in an amount of 1 % of concrete volume standardly
The morphology changes onto Concrix and BeneSteel fiber surfaces are shown in the Figure 3 and Figure 4, respectively
The same can be said of fibers modified 30 seconds by plasma treatment
Summary
A fiber-reinforced concrete (FRC) is a composite material containing fibers in an amount of 1 % of concrete volume standardly. FRC mechanical properties are dependent on (i) properties of each components (by which we mean mainly cement matrix as a continual phase and fibers as reinforcement) and (ii) a mutual interaction between the two basic phases. The strong interaction characterized by the bond and the adhesion between the two phases plays an important role in the mechanical performance of the FRC [1,2,3]. The FRC may be reinforced with polymer fibers. The use of polymer instead of more widespread steel fibers brings a number of benefits: a corrosion resistance, a lower propensity to a balling fibers creation during a mixing process, a frugality to hosses and nozzles of shotcrete devices, etc [4]
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