Sorptivity and acid resistance of ambient-cured geopolymer mortars containing nano-silica

By P. Deb, P. Sarker, S. Barbhuiya. 2016

233 citations recorded by the source corpus.

Abstract This study investigated the effects of nano-silica on flowability, strength development, sorptivity and acid resistance properties of fly ash geopolymer mortars cured at 20 °C. The changes in mass, compressive strength and microstructure of the specimens after immersion in acid solutions for different durations were determined. The microstructures were studied by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) analysis. It was found that addition of nano-silica in geopolymer mortars based on fly ash alone or fly ash blended with 15% GGBFS or 10% OPC improved the compactness of microstructure by reducing porosity. Thus, the nano-silica reduced sorptivity and increased compressive strength of the mixes. The average mass loss after 90 days of immersion in acid solutions reduced from 6.0% to 1.9% by addition of 2% nano-silica. Similarly, significant reduction in strength loss after immersion in acid solution was observed in the specimens by using nano-silica.

Subfields: Civil and Structural Engineering, Earth-Surface Processes, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/8091abea3f6fef69b59b3d8e8668468cd2e2ee28

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Civil and Structural Engineering

In Materials Chemistry

Citations in the corpus

Clean production and properties of geopolymer concrete; A review (2020, background): “35 higher amount of slag in the mixture and the slump of fresh concrete reduces a bit when the slag content increases (Deb et al., 2016; Nath and Sarker, 2012).”
A Review of Recent Developments and Advances in Eco-Friendly Geopolymer Concrete (2020, background): “[115] investigated that the use of silica nanoparticles decreases the slump value due to accelerated reaction and high demand of nanoparticles.”
Sulfuric acid resistance of one-part alkali-activated mortars (2018, unknown): “The addition of nano-silica or microsilica modifies the particle size distribution of the dry binder, potentially increasing the packing density of the solid particles in the fresh paste and thus improving its microstructure after hardening; furthermore, it is a way to modify the chemical compositio”