Influence of loading and cracks on carbonation of RC elements made of different concrete types

Xiao Hui Wang, Dimitri V. Val (Lead / Corresponding author), Li Zheng, M. Roderick Jones

Research output: Contribution to journalArticle

3 Citations (Scopus)
104 Downloads (Pure)

Abstract

Accurate prediction of concrete carbonation is important for the correct assessment of both durability and environmental impact of reinforced concrete (RC) structures. Loading applied to a RC structure and concrete cracking caused by this loading may significantly affect the concrete carbonation process. However, so far these factors have received little attention of researchers, especially this concerns ‘green’ concretes, i.e. concretes in which Portland cement (PC) is partially replaced by supplementary cementitious materials such as fly ash (FA) and ground granulated blast-furnace slag (GGBS). Thus, the aim of the study presented in the paper was to experimentally investigate the influence of static loading and associated concrete cracking on carbonation of RC elements made of PC concretes and ‘green’ concretes containing significant amounts FA and GGBS. For this purpose, six concrete mixes with two water/binder (w/b) ratios (0.40 and 0.55) and different proportions of PC, FA and GGBS were prepared. The mixes were used to cast twelve RC beams (100 × 120 × 900-mm) and a larger number of 100-mm concrete cubes. The beam specimens were loaded in four-point bending to produce flexural cracks of maximum width of either 0.1 mm or 0.3 mm. The loaded beam specimens along with unloaded cube specimens were then placed into a carbonation chamber and subject to accelerated carbonation for 120 days. After that the carbonation depths in the beams and cubes were measured. Results of the tests show a significant effect of load induced stresses (both tensile and compressive) on the carbonation resistance of the concretes, especially of ‘green’ concretes. The influence of cracking on concrete carbonation was also observed and discussed in the paper.

Original languageEnglish
Pages (from-to)12-28
Number of pages17
JournalConstruction and Building Materials
Volume164
Early online date30 Dec 2017
DOIs
Publication statusPublished - 10 Mar 2018

Fingerprint

Carbonation
Reinforced concrete
Concretes
Cracks
Coal Ash
Portland cement
Fly ash
Slags
Concrete construction
Concrete mixtures
Compressive stress
Tensile stress
Binders
Environmental impact
Loads (forces)
Durability

Keywords

  • Accelerated carbonation
  • Cracks
  • Fly ash
  • Granulated blast-furnace slag
  • Loading
  • Portland cement concrete

Cite this

@article{e26e11ef089c4909aeec187e9329eab5,
title = "Influence of loading and cracks on carbonation of RC elements made of different concrete types",
abstract = "Accurate prediction of concrete carbonation is important for the correct assessment of both durability and environmental impact of reinforced concrete (RC) structures. Loading applied to a RC structure and concrete cracking caused by this loading may significantly affect the concrete carbonation process. However, so far these factors have received little attention of researchers, especially this concerns ‘green’ concretes, i.e. concretes in which Portland cement (PC) is partially replaced by supplementary cementitious materials such as fly ash (FA) and ground granulated blast-furnace slag (GGBS). Thus, the aim of the study presented in the paper was to experimentally investigate the influence of static loading and associated concrete cracking on carbonation of RC elements made of PC concretes and ‘green’ concretes containing significant amounts FA and GGBS. For this purpose, six concrete mixes with two water/binder (w/b) ratios (0.40 and 0.55) and different proportions of PC, FA and GGBS were prepared. The mixes were used to cast twelve RC beams (100 × 120 × 900-mm) and a larger number of 100-mm concrete cubes. The beam specimens were loaded in four-point bending to produce flexural cracks of maximum width of either 0.1 mm or 0.3 mm. The loaded beam specimens along with unloaded cube specimens were then placed into a carbonation chamber and subject to accelerated carbonation for 120 days. After that the carbonation depths in the beams and cubes were measured. Results of the tests show a significant effect of load induced stresses (both tensile and compressive) on the carbonation resistance of the concretes, especially of ‘green’ concretes. The influence of cracking on concrete carbonation was also observed and discussed in the paper.",
keywords = "Accelerated carbonation, Cracks, Fly ash, Granulated blast-furnace slag, Loading, Portland cement concrete",
author = "Wang, {Xiao Hui} and Val, {Dimitri V.} and Li Zheng and Jones, {M. Roderick}",
note = "This research was supported by the HORIZON 2020 Marie Skłodowska-Curie Research Fellowship Programme H2020 – 658475, titled: Climate-resilient pathways for the development of concrete infrastructure: adaptation, mitigation and sustainability (ClimatCon).",
year = "2018",
month = "3",
day = "10",
doi = "10.1016/j.conbuildmat.2017.12.142",
language = "English",
volume = "164",
pages = "12--28",
journal = "Construction and Building Materials",
issn = "0950-0618",
publisher = "Elsevier",

}

Influence of loading and cracks on carbonation of RC elements made of different concrete types. / Wang, Xiao Hui; Val, Dimitri V. (Lead / Corresponding author); Zheng, Li; Jones, M. Roderick.

In: Construction and Building Materials, Vol. 164, 10.03.2018, p. 12-28.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Influence of loading and cracks on carbonation of RC elements made of different concrete types

AU - Wang, Xiao Hui

AU - Val, Dimitri V.

AU - Zheng, Li

AU - Jones, M. Roderick

N1 - This research was supported by the HORIZON 2020 Marie Skłodowska-Curie Research Fellowship Programme H2020 – 658475, titled: Climate-resilient pathways for the development of concrete infrastructure: adaptation, mitigation and sustainability (ClimatCon).

PY - 2018/3/10

Y1 - 2018/3/10

N2 - Accurate prediction of concrete carbonation is important for the correct assessment of both durability and environmental impact of reinforced concrete (RC) structures. Loading applied to a RC structure and concrete cracking caused by this loading may significantly affect the concrete carbonation process. However, so far these factors have received little attention of researchers, especially this concerns ‘green’ concretes, i.e. concretes in which Portland cement (PC) is partially replaced by supplementary cementitious materials such as fly ash (FA) and ground granulated blast-furnace slag (GGBS). Thus, the aim of the study presented in the paper was to experimentally investigate the influence of static loading and associated concrete cracking on carbonation of RC elements made of PC concretes and ‘green’ concretes containing significant amounts FA and GGBS. For this purpose, six concrete mixes with two water/binder (w/b) ratios (0.40 and 0.55) and different proportions of PC, FA and GGBS were prepared. The mixes were used to cast twelve RC beams (100 × 120 × 900-mm) and a larger number of 100-mm concrete cubes. The beam specimens were loaded in four-point bending to produce flexural cracks of maximum width of either 0.1 mm or 0.3 mm. The loaded beam specimens along with unloaded cube specimens were then placed into a carbonation chamber and subject to accelerated carbonation for 120 days. After that the carbonation depths in the beams and cubes were measured. Results of the tests show a significant effect of load induced stresses (both tensile and compressive) on the carbonation resistance of the concretes, especially of ‘green’ concretes. The influence of cracking on concrete carbonation was also observed and discussed in the paper.

AB - Accurate prediction of concrete carbonation is important for the correct assessment of both durability and environmental impact of reinforced concrete (RC) structures. Loading applied to a RC structure and concrete cracking caused by this loading may significantly affect the concrete carbonation process. However, so far these factors have received little attention of researchers, especially this concerns ‘green’ concretes, i.e. concretes in which Portland cement (PC) is partially replaced by supplementary cementitious materials such as fly ash (FA) and ground granulated blast-furnace slag (GGBS). Thus, the aim of the study presented in the paper was to experimentally investigate the influence of static loading and associated concrete cracking on carbonation of RC elements made of PC concretes and ‘green’ concretes containing significant amounts FA and GGBS. For this purpose, six concrete mixes with two water/binder (w/b) ratios (0.40 and 0.55) and different proportions of PC, FA and GGBS were prepared. The mixes were used to cast twelve RC beams (100 × 120 × 900-mm) and a larger number of 100-mm concrete cubes. The beam specimens were loaded in four-point bending to produce flexural cracks of maximum width of either 0.1 mm or 0.3 mm. The loaded beam specimens along with unloaded cube specimens were then placed into a carbonation chamber and subject to accelerated carbonation for 120 days. After that the carbonation depths in the beams and cubes were measured. Results of the tests show a significant effect of load induced stresses (both tensile and compressive) on the carbonation resistance of the concretes, especially of ‘green’ concretes. The influence of cracking on concrete carbonation was also observed and discussed in the paper.

KW - Accelerated carbonation

KW - Cracks

KW - Fly ash

KW - Granulated blast-furnace slag

KW - Loading

KW - Portland cement concrete

U2 - 10.1016/j.conbuildmat.2017.12.142

DO - 10.1016/j.conbuildmat.2017.12.142

M3 - Article

AN - SCOPUS:85039777109

VL - 164

SP - 12

EP - 28

JO - Construction and Building Materials

JF - Construction and Building Materials

SN - 0950-0618

ER -