Clinkering-free cementation by fly ash carbonation

Zhenhua Wei, Bu Wang, Gabriel Falzone, Erika Callagon, Monday Uchenna Okoronkwo, Zhenyu She, Tandre Oey, Magdalena Balonis, Narayanan Neithalath, Laurent Pilon, Gaurav Sant

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

The production of ordinary portland cement (OPC) is a CO2 intensive process. Specifically, OPC clinkering reactions not only require substantial energy in the form of heat, but they also result in the release of CO2; i.e., from both the decarbonation of limestone and the combustion of fuel to provide heat. To create alternatives to this CO2 intensive process, this paper demonstrates a new route for clinkering-free cementation by the carbonation of fly ash; i.e., a by-product of coal combustion. It is shown that in moist environments and at sub-boiling temperatures, Ca-rich fly ashes react readily with gas-phase CO2 to produce robustly cemented solids. After seven days of exposure to vapor-phase CO2 at 75 °C, such formulations achieve a compressive strength of around 35 MPa and take-up 9% CO2 (i.e., by mass of fly ash solids). On the other hand, Ca-poor fly ashes due to their reduced alkalinity (i.e., low abundance of mobile Ca- or Mg-species), show limited potential for CO2 uptake and strength gain—although this deficiency can be somewhat addressed by the provision of supplemental/extrinsic Ca agents. The roles of CO2 concentration and processing temperature are discussed, and linked to the progress of reactions and the development of microstructure. The outcomes create new pathways for achieving clinkering-free cementation while enabling the beneficial utilization (“upcycling”) of emitted CO2 and fly ash; i.e., two abundant, but underutilized industrial by-products.
Original languageEnglish
Pages (from-to)117-127
Number of pages11
JournalJournal of CO2 Utilization
Volume23
DOIs
Publication statusPublished - Jan 2018
MoE publication typeA1 Journal article-refereed

Fingerprint

Coal Ash
Carbonation
cementation
Fly ash
fly ash
Portland cement
Byproducts
cement
Calcium Carbonate
Coal combustion
Alkalinity
Limestone
compressive strength
Boiling liquids
alkalinity
Compressive strength
microstructure
combustion
Gases
temperature

Keywords

  • CO
  • Cementation
  • Concrete
  • Fly ash
  • Strength
  • Upcycling

Cite this

Wei, Z., Wang, B., Falzone, G., Callagon, E., Uchenna Okoronkwo, M., She, Z., ... Sant, G. (2018). Clinkering-free cementation by fly ash carbonation. Journal of CO2 Utilization, 23, 117-127. https://doi.org/10.1016/j.jcou.2017.11.005
Wei, Zhenhua ; Wang, Bu ; Falzone, Gabriel ; Callagon, Erika ; Uchenna Okoronkwo, Monday ; She, Zhenyu ; Oey, Tandre ; Balonis, Magdalena ; Neithalath, Narayanan ; Pilon, Laurent ; Sant, Gaurav. / Clinkering-free cementation by fly ash carbonation. In: Journal of CO2 Utilization. 2018 ; Vol. 23. pp. 117-127.
@article{45d4be205c58440fb31d66131dc2fd55,
title = "Clinkering-free cementation by fly ash carbonation",
abstract = "The production of ordinary portland cement (OPC) is a CO2 intensive process. Specifically, OPC clinkering reactions not only require substantial energy in the form of heat, but they also result in the release of CO2; i.e., from both the decarbonation of limestone and the combustion of fuel to provide heat. To create alternatives to this CO2 intensive process, this paper demonstrates a new route for clinkering-free cementation by the carbonation of fly ash; i.e., a by-product of coal combustion. It is shown that in moist environments and at sub-boiling temperatures, Ca-rich fly ashes react readily with gas-phase CO2 to produce robustly cemented solids. After seven days of exposure to vapor-phase CO2 at 75 °C, such formulations achieve a compressive strength of around 35 MPa and take-up 9{\%} CO2 (i.e., by mass of fly ash solids). On the other hand, Ca-poor fly ashes due to their reduced alkalinity (i.e., low abundance of mobile Ca- or Mg-species), show limited potential for CO2 uptake and strength gain—although this deficiency can be somewhat addressed by the provision of supplemental/extrinsic Ca agents. The roles of CO2 concentration and processing temperature are discussed, and linked to the progress of reactions and the development of microstructure. The outcomes create new pathways for achieving clinkering-free cementation while enabling the beneficial utilization (“upcycling”) of emitted CO2 and fly ash; i.e., two abundant, but underutilized industrial by-products.",
keywords = "CO, Cementation, Concrete, Fly ash, Strength, Upcycling",
author = "Zhenhua Wei and Bu Wang and Gabriel Falzone and Erika Callagon and {Uchenna Okoronkwo}, Monday and Zhenyu She and Tandre Oey and Magdalena Balonis and Narayanan Neithalath and Laurent Pilon and Gaurav Sant",
year = "2018",
month = "1",
doi = "10.1016/j.jcou.2017.11.005",
language = "English",
volume = "23",
pages = "117--127",
journal = "Journal of CO2 Utilization",
issn = "2212-9820",
publisher = "Elsevier",

}

Wei, Z, Wang, B, Falzone, G, Callagon, E, Uchenna Okoronkwo, M, She, Z, Oey, T, Balonis, M, Neithalath, N, Pilon, L & Sant, G 2018, 'Clinkering-free cementation by fly ash carbonation', Journal of CO2 Utilization, vol. 23, pp. 117-127. https://doi.org/10.1016/j.jcou.2017.11.005

Clinkering-free cementation by fly ash carbonation. / Wei, Zhenhua; Wang, Bu; Falzone, Gabriel; Callagon, Erika; Uchenna Okoronkwo, Monday; She, Zhenyu; Oey, Tandre; Balonis, Magdalena; Neithalath, Narayanan; Pilon, Laurent; Sant, Gaurav.

In: Journal of CO2 Utilization, Vol. 23, 01.2018, p. 117-127.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Clinkering-free cementation by fly ash carbonation

AU - Wei, Zhenhua

AU - Wang, Bu

AU - Falzone, Gabriel

AU - Callagon, Erika

AU - Uchenna Okoronkwo, Monday

AU - She, Zhenyu

AU - Oey, Tandre

AU - Balonis, Magdalena

AU - Neithalath, Narayanan

AU - Pilon, Laurent

AU - Sant, Gaurav

PY - 2018/1

Y1 - 2018/1

N2 - The production of ordinary portland cement (OPC) is a CO2 intensive process. Specifically, OPC clinkering reactions not only require substantial energy in the form of heat, but they also result in the release of CO2; i.e., from both the decarbonation of limestone and the combustion of fuel to provide heat. To create alternatives to this CO2 intensive process, this paper demonstrates a new route for clinkering-free cementation by the carbonation of fly ash; i.e., a by-product of coal combustion. It is shown that in moist environments and at sub-boiling temperatures, Ca-rich fly ashes react readily with gas-phase CO2 to produce robustly cemented solids. After seven days of exposure to vapor-phase CO2 at 75 °C, such formulations achieve a compressive strength of around 35 MPa and take-up 9% CO2 (i.e., by mass of fly ash solids). On the other hand, Ca-poor fly ashes due to their reduced alkalinity (i.e., low abundance of mobile Ca- or Mg-species), show limited potential for CO2 uptake and strength gain—although this deficiency can be somewhat addressed by the provision of supplemental/extrinsic Ca agents. The roles of CO2 concentration and processing temperature are discussed, and linked to the progress of reactions and the development of microstructure. The outcomes create new pathways for achieving clinkering-free cementation while enabling the beneficial utilization (“upcycling”) of emitted CO2 and fly ash; i.e., two abundant, but underutilized industrial by-products.

AB - The production of ordinary portland cement (OPC) is a CO2 intensive process. Specifically, OPC clinkering reactions not only require substantial energy in the form of heat, but they also result in the release of CO2; i.e., from both the decarbonation of limestone and the combustion of fuel to provide heat. To create alternatives to this CO2 intensive process, this paper demonstrates a new route for clinkering-free cementation by the carbonation of fly ash; i.e., a by-product of coal combustion. It is shown that in moist environments and at sub-boiling temperatures, Ca-rich fly ashes react readily with gas-phase CO2 to produce robustly cemented solids. After seven days of exposure to vapor-phase CO2 at 75 °C, such formulations achieve a compressive strength of around 35 MPa and take-up 9% CO2 (i.e., by mass of fly ash solids). On the other hand, Ca-poor fly ashes due to their reduced alkalinity (i.e., low abundance of mobile Ca- or Mg-species), show limited potential for CO2 uptake and strength gain—although this deficiency can be somewhat addressed by the provision of supplemental/extrinsic Ca agents. The roles of CO2 concentration and processing temperature are discussed, and linked to the progress of reactions and the development of microstructure. The outcomes create new pathways for achieving clinkering-free cementation while enabling the beneficial utilization (“upcycling”) of emitted CO2 and fly ash; i.e., two abundant, but underutilized industrial by-products.

KW - CO

KW - Cementation

KW - Concrete

KW - Fly ash

KW - Strength

KW - Upcycling

UR - http://www.scopus.com/inward/record.url?scp=85035757801&partnerID=8YFLogxK

U2 - 10.1016/j.jcou.2017.11.005

DO - 10.1016/j.jcou.2017.11.005

M3 - Article

VL - 23

SP - 117

EP - 127

JO - Journal of CO2 Utilization

JF - Journal of CO2 Utilization

SN - 2212-9820

ER -

Wei Z, Wang B, Falzone G, Callagon E, Uchenna Okoronkwo M, She Z et al. Clinkering-free cementation by fly ash carbonation. Journal of CO2 Utilization. 2018 Jan;23:117-127. https://doi.org/10.1016/j.jcou.2017.11.005