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Experimental Investigation for Strengthening the Nanocomposite Cementitious Materials with a Nanoscale Modification

Arpita Das, Showmen Saha

Abstract


For the last few decades, researchers have widely used nanopolymer to control the mechanical properties of cementitious materials as a micro reinforcement. This paper examines and compares the mechanical and microstructure property of nanofiber cementitious material. Twenty-four sets of beam/cube cast with carbon nanofibers (CNFs) cementitious material where CNFs were used from 0.1%, 0.2%, and 0.3% of cement weight. The nanoparticles were scattered using a surfactant and an ultrasonic probe so nicator and then cast in different types of molds. The 28-day compressive and 3- point flexure bending strength was tested. As a result, properties like flexural strength, compression strength, Young's modulus, toughness, and strain capacity of various percentages of CNFs cementitious material were estimated. 3-point flexure bending strength test, flexural strength, compression strength, Young's modulus, toughness, and strain capacity was estimated for every CNFs nanocomposite. Increasing the percentage of CNFs, flexural strength improved by 43%, 65%, and 68% compared to without nanofiber cementitious material, enhancing its toughness and young modulus. Scanning electron microscopic (SEM) and transmission electron microscope (TEM) result was observed to understand the proper bonding between nanofiber and cementitious material. The XRD results were used to analyze the phase-identification, crystalline size, crystallinity index (CI), and d-spacing for all sets of cementitious materials. Fourier transform infrared spectroscopy (FTIR) results were also introduced in this paper to identify the board peaks that facilitate the functional group's electron delocalization pattern. After completing this study, the microscopic and mechanical analysis may offer a key reference for carbon nanofiber cement composites, which can lift their strength, constancy, integrity, densify, and reinforce the composite microstructure.


Keywords


Carbon nanofibers, cement, 3-point flexural bending strength, rheological properties, Scanning Electron Microscopic (SEM) results, XRD results.

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