Early Age Assessment of a New Course of Irish Fly Ash as a Cement Replacement

Author:

Shaji Nikki1ORCID,Holmes Niall12ORCID,Tyrer Mark3ORCID

Affiliation:

1. School of Transport & Civil Engineering, TU Dublin City Campus, D01 K822 Dublin, Ireland

2. Built Environment Research and Innovation Centre, TU Dublin City Campus, D01 K822 Dublin, Ireland

3. Institute of Advanced Study, Collegium Basilea, 4053 Basel, Switzerland

Abstract

This paper explores the potential of a new source of fly ash, deposited on the site of a coal-fired power plant in Ireland dating from 1985 to 1995, as a cement replacement material. A series of X-ray diffraction (XRD) analyses on binder samples with cement replacement levels of 0, 10, 25 and 35% was undertaken to determine the fly ash’s mineralogical composition and to determine its suitability as a supplemental cementitious material (SCM). The XRD results reveal a unique mineral composition with promising characteristics for enhancing the strength and durability of concrete. The experimental results were used to calibrate a thermodynamic model to predict changing phase assemblage and hydration behaviour over time and per replacement level. Thermodynamic models have been shown to give credible predictions of the long-term performance of cements, including SCMs. The initial experimental results’ thermodynamic modelling demonstrates the feasibility of this fly ash source as a sustainable alternative to traditional cement, paving the way for more eco-friendly construction. Ash deposits dating from 1995 to 2005 and from 2005 to the present will be presented in subsequent publications.

Funder

TU Dublin Business Partners Research Scholarship

Publisher

MDPI AG

Reference32 articles.

1. (2023, November 07). Ireland Energy Needs. Available online: https://www.seai.ie/about/irelands-energy-targets/.

2. (2023, November 07). Making Concrete Change. Available online: https://www.chathamhouse.org/2018/06/making-concrete-change-innovation-low-carbon-cement-and-concrete.

3. (2011). Cement: Composition, Specification and Conformity Criteria for Common Cements (Standard No. BS EN 197-1).

4. Snowdon, R., and Richardson, M. (1997, January 28). Influence of mix parameters on the permeability of PFA-concretes manufactured with PFA sourced in Ireland. Proceedings of the Colloquium on Concrete Research in Ireland, Dublin, Ireland.

5. Evaluation of pulverised fuel ash as a cement replacer in concretes used in silage storage structures;Lenehan;Irish J. Agric. Food Res.,2001

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