Abstract
This paper presents the effects of various nanosilica (NS) contents on the mechanical properties of polyvinyl alcohol (PVA) fiber-reinforced geopolymer composites (PVA-FRGC). Microstructure analysis with X-ray diffraction (XRD) and scanning electron microscopy (SEM) was used to characterize the geopolymer composites. The results showed that the mechanical properties in terms of compressive strength, impact strength, and flexural behavior were improved due to the addition of NS to the PVA-FRGC. The optimum NS content was 1.0 to 2.0 wt%, which exhibited highest improvement in the above mechanical properties. Microstructure analysis showed that the addition of NS up to an optimum level densified the microstructure of the matrix as well as the PVA fiber–geopolymer matrix interface.
Highlights
Carbon dioxide emission during manufacturing of ordinary Portland cement is one of the major environmental pollution issues worldwide
The current study focuses on the effect of various nanosilica (NS) additions to a geopolymer matrix reinforced using polyvinyl alcohol (PVA) fibers
Nanosilica was supplied by Nanostructured and Amorphous Materials, Inc
Summary
Carbon dioxide emission during manufacturing of ordinary Portland cement is one of the major environmental pollution issues worldwide. For a sustainable and alternative binder that is produced by activating alumina–silicate source material using alkali solutions. The use of geopolymer binders can reduce around 80–90% of carbon dioxide emissions [1]. Significant research has been conducted to study the various properties of geopolymers, and they show that most of the properties are superior or comparable to their counterpart cement-based binders. Despite the above improvements, the brittleness of geopolymers is still similar to cement concrete. To address this limitation, researchers have studied the use of various types of short, randomly distributed fibers to reinforce geopolymers and improve their tensile and flexural behavior
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