Rice husk ash and nanomaterial-blended cement composites: a review
Pasindu Samarajeewa, Samith Buddika, Hiran Yapa, Chamila Gunasekara, David W. Law
TL;DR
This paper reviews how blending rice husk ash and nanomaterials in cement improves sustainability and performance, while addressing challenges like cost and reactivity.
Contribution
The paper provides a comprehensive review of interactions between rice husk ash and nanomaterials in cement composites.
Findings
Rice husk ash has pozzolanic properties but suffers from low reactivity and poor workability.
Nanomaterials improve microstructure and reactivity but are costly and hard to process.
Blending nano- and micro-sized SCMs shows synergistic effects that can overcome individual limitations.
Abstract
Enhancing the sustainability and performance of cement composites is crucial to the protection of the environment and advancing building technology. Numerous studies have been carried out to evaluate binary and ternary mixes incorporating micro- and nanosized supplementary cementitious materials (SCMs) to achieve these goals. Rice husk ash (RHA) stands out as an SCM due to its abundance as an agricultural residue having pozzolanic properties. However, the relatively low reactivity and the reduced workability due to the mesoporous structure hinder the adoption of RHA in cement composites. While nanomaterials offer the advantage of improved microstructure and higher reactivity, their high cost and demanding processing techniques limit their widespread adoption. Combined blends of nano- and micro-sized SCMs have shown promising results, as synergistic effects can mitigate their individual…
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Taxonomy
TopicsConcrete and Cement Materials Research · Magnesium Oxide Properties and Applications · Natural Fiber Reinforced Composites