High-volume, ultra-low-density fly ash foamed concrete

M. Roderick Jones (Lead / Corresponding author), Kezban Ozlutas, Li Zheng

Research output: Contribution to journalArticle

5 Citations (Scopus)
30 Downloads (Pure)

Abstract

Resource efficiency is a core criterion for the regulation of construction products and rightly promotes the most sustainable solution. This paper reports the development a low embodied carbon dioxide backfill material based on an ultra-low-density foamed concrete using a high volume of fly ash to replace Portland cement. This material builds on previously reported research on the underlying causes of instability in low-density foamed concrete mixes and demonstrates that, with the addition of a small amount of calcium sulfoaluminate (CSA) cement, stable ultra-low-density foamed concretes with density as low as 150 kg/m3 can be produced. A high volume of fly ash up to 70% of cement phase has been used, which reduced the average bubble size of the foamed concrete and increased the thickness of the bubble walls. The observed microstructure of fly ash foamed concretes was improved over the long term. The use of fly ash significantly reduced the embodied carbon dioxide of these mixes, which potentially has significant benefits for large-scale backfill and similar applications.
Original languageEnglish
Pages (from-to)1146-1156
Number of pages11
JournalMagazine of Concrete Research
Volume69
Issue number22
Early online date27 May 2017
DOIs
Publication statusPublished - Nov 2017

Keywords

  • aerated concrete
  • lightweight concrete
  • sustainability

Cite this

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abstract = "Resource efficiency is a core criterion for the regulation of construction products and rightly promotes the most sustainable solution. This paper reports the development a low embodied carbon dioxide backfill material based on an ultra-low-density foamed concrete using a high volume of fly ash to replace Portland cement. This material builds on previously reported research on the underlying causes of instability in low-density foamed concrete mixes and demonstrates that, with the addition of a small amount of calcium sulfoaluminate (CSA) cement, stable ultra-low-density foamed concretes with density as low as 150 kg/m3 can be produced. A high volume of fly ash up to 70{\%} of cement phase has been used, which reduced the average bubble size of the foamed concrete and increased the thickness of the bubble walls. The observed microstructure of fly ash foamed concretes was improved over the long term. The use of fly ash significantly reduced the embodied carbon dioxide of these mixes, which potentially has significant benefits for large-scale backfill and similar applications.",
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High-volume, ultra-low-density fly ash foamed concrete. / Jones, M. Roderick (Lead / Corresponding author); Ozlutas, Kezban; Zheng, Li.

In: Magazine of Concrete Research, Vol. 69, No. 22, 11.2017, p. 1146-1156.

Research output: Contribution to journalArticle

TY - JOUR

T1 - High-volume, ultra-low-density fly ash foamed concrete

AU - Jones, M. Roderick

AU - Ozlutas, Kezban

AU - Zheng, Li

N1 - Funding: none.

PY - 2017/11

Y1 - 2017/11

N2 - Resource efficiency is a core criterion for the regulation of construction products and rightly promotes the most sustainable solution. This paper reports the development a low embodied carbon dioxide backfill material based on an ultra-low-density foamed concrete using a high volume of fly ash to replace Portland cement. This material builds on previously reported research on the underlying causes of instability in low-density foamed concrete mixes and demonstrates that, with the addition of a small amount of calcium sulfoaluminate (CSA) cement, stable ultra-low-density foamed concretes with density as low as 150 kg/m3 can be produced. A high volume of fly ash up to 70% of cement phase has been used, which reduced the average bubble size of the foamed concrete and increased the thickness of the bubble walls. The observed microstructure of fly ash foamed concretes was improved over the long term. The use of fly ash significantly reduced the embodied carbon dioxide of these mixes, which potentially has significant benefits for large-scale backfill and similar applications.

AB - Resource efficiency is a core criterion for the regulation of construction products and rightly promotes the most sustainable solution. This paper reports the development a low embodied carbon dioxide backfill material based on an ultra-low-density foamed concrete using a high volume of fly ash to replace Portland cement. This material builds on previously reported research on the underlying causes of instability in low-density foamed concrete mixes and demonstrates that, with the addition of a small amount of calcium sulfoaluminate (CSA) cement, stable ultra-low-density foamed concretes with density as low as 150 kg/m3 can be produced. A high volume of fly ash up to 70% of cement phase has been used, which reduced the average bubble size of the foamed concrete and increased the thickness of the bubble walls. The observed microstructure of fly ash foamed concretes was improved over the long term. The use of fly ash significantly reduced the embodied carbon dioxide of these mixes, which potentially has significant benefits for large-scale backfill and similar applications.

KW - aerated concrete

KW - lightweight concrete

KW - sustainability

U2 - 10.1680/jmacr.17.00063

DO - 10.1680/jmacr.17.00063

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SP - 1146

EP - 1156

JO - Magazine of Concrete Research

JF - Magazine of Concrete Research

SN - 0024-9831

IS - 22

ER -