Morphological and characterization-based verification of the properties of concrete with amorphous nanosilica synthesized from rice hull ash

Issue Date

7-2016

Abstract

In line with the recent technological breakthroughs, the demand for strong and durable concrete structures and the rising environmental awareness, this study was conducted to determine the strength, durability and workability properties of concrete with amorphous nanosilica (nS) from rice hull ash and verify its behavior using material characterization. Nanosilica was added to the concrete mixture at 2.5 and 5% by mass of cement maintaining a 0.54 water-cement ratio and cured for 28 days. The addition of nS decreased the workability of the concrete. Strength and fracture mechanism were improved with the increasing percentage of nS. Durability, measured in terms of chloride ion penetration, also improved with increasing nS content. The properties of the microstructure of the samples were investigated using Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM), Dynamic Light Scattering (DLS), and Physisorption Analysis. Addition of nanosilica resulted to a less workable concrete but with improved strength and durability. Characterization tests verified that the improved properties are due to the finer cement matrix, smaller particle sizes, lesser void spaces and formation of better hydration products.

Source or Periodical Title

Asia Life Sciences

ISSN

0117-3375

Volume

25

Issue

1

Page

311-324

Document Type

Article

Physical Description

illustrations; graph; tables; references

Language

English

Subject

Rice husks; Construction materials

En – AGROVOC descriptors

RICE HUSKS; ASHES; CONSTRUCTION MATERIALS; CONCRETE; MECHANICAL PROPERTIES

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