Journal Published Online: 30 January 2017
Volume 6, Issue 1

Performance Characteristics of Blended Cementitious Systems Incorporating Chemically Transformed Rice Husk Ash

CODEN: ACEM59

Abstract

Research has indicated that an as-received rice husk ash (AR-RHA) can be chemically transformed by being treated with alkali solutions. Such a chemical transformation could result in an increase in silicate ion concentration, reduction of particle size, and elimination of the cellular morphology. In this paper, the early- and later-age performance was investigated including flowability, setting time, chemical shrinkage (CS), compressive strength, hardened porosity, and apparent chloride ion permeability (Da). The process provides several benefits to the rice husk ash (RHA) blended cementitious system, including faster setting, increased early-age compressive strength, reduced porosity, and decreased Da. These benefits occurred due to the physico-chemical mechanisms of better particle packing from smaller RHA particles, the NaOH addition, and the increased silicate ion concentration in solution. This chemical transformation method is promising and can make RHA a more user-friendly supplementary cementing material (SCM), enhancing its likelihood of being utilized.

Author Information

Prasittisopin, L.
Siam Research and Innovation Co. Ltd, Siam Cement Group – Cement and Building Materials, Kaengkhoi, Saraburi, TH Civil Engineering Program, Faculty of Engineering, Bangkok Thonburi, Bangkok, TH
Trejo, D.
School of Civil and Construction Engineering, College of Engineering, Oregon State Univ., Corvallis, OR, US
Pages: 19
Price: $25.00
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Details
Stock #: ACEM20160001
ISSN: 2165-3984
DOI: 10.1520/ACEM20160001