By Colin D. Johnston
This publication summarizes and simplifies the result of a substantial physique of analysis and useful event with quite a lot of fiber-reinforced cementitious composites.
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Additional resources for Fiber-reinforced cements and concretes
The difference probably reflects a change from relatively low fiber-matrix interfacial bond strength with failure primarily by fiber pullout to failure dominated by fiber breakage associated with relatively high interfacial bond. This data source also provides a rare opportunity to contrast the reinforcing effectiveness of these fibers in bending (Fig. 20) with their effectiveness in direct tension (Fig. 3) for specimens of comparable thickness and fiber orientation, and confirms the considerably higher stress levels attainable in flexure, particularly after cracking, analytically predicted from Fig.
5, right) (Johnston, 1980). Likewise, the effect of increasing the fiber pullout resistance of smooth fibers by altering the mortar proportions to increase the average interfacial shear bond strength by about 40%, or by replacing smooth fibers with rougher surface-deformed equivalents, reflects the increase in composite strength expected from the previous discussion of single fiber pullout tests (Fig. 6) (Gray and Johnston, 1987). In conventional tension tests at relatively low fiber contents the stiffness of the testing equipment is usually so low that failure occurs once the matrix cracks (Fig.
Truly elastic, high-modulus fibers offer greater potential reinforcing effectiveness than low-modulus elastic fibers or creep-prone fibers where the modulus decreases with loading time. However, realization of full reinforcing potential depends strongly on the interfacial shear bond between fiber and matrix and whether composite failure ultimately occurs by fiber pullout or fiber breakage. 2. Interfacial Shear Strength In the simplest case of very long fibers aligned in the direction of uniaxial tensile stress (Fig.