Experimental investigation on the fiber reinforced ash-based geopolymer concrete with Musa basjoo fibers

Abstract

The research proposes a novel way of manufacturing the one-part geopolymer fiber reinforced concrete with Musa basjoo fibers (an agricultural waste). For the preparation of a one-part alkali medium, only sodium hydroxide (NaOH) is utilized. To test the performance of the concrete, specimens are tested for their workability, strength, and absorption properties. The molarity of the NaOH solution above 10 M is not recommended with Musa basjoo fibers. The sample strength in tension and flexure increased by 61% and 63%, respectively with the addition of fiber. Fiber works effectively in resisting the first crack and its propagation by taking additional stress and this is the reason for the incremental trend till 1.25% fiber dosage. Beyond 1.25% dosage, the specimen strength is reduced. As too much fiber content is detrimental to the bond between fibers and concrete matrix. Even without the secondary alkali medium (Na2SiO3), the strength results are matching with the two-part alkali medium specimens. This implies that Musa basjoo fibers are greatly contributing to the strength attributes. Though the strength of the specimen is increased to 1.25% fiber dosage, considering the workability aspects, Musa basjoo fiber addition beyond 1% of the raw feed is not recommended for the geopolymers.