Effect of cracks on alkalinity level of concrete structures exposed to carbon dioxide environment condition

Research output: Contribution to conferencePaperResearchpeer-review

Abstract

Reduction of alkalinity of concrete due to the diffusivity of carbon dioxide (CO2) and concrete carbonation is one of the major issues influencing the durability of reinforced concrete structures. Most of the previous studies have concentrated on the un-cracked / unloaded concrete although it has been acknowledged that structural cracks in concrete have an impact on the CO2 diffusivity and carbonation - induced reinforcement corrosion as well as service life of concrete structures. Hence, this article aims to investigate the effect of cracks (produced by loading) in concrete exposed to the CO2 environment condition, on the alkalinity level (apparent pH) and carbonation depth in concrete. Accelerated environmental test programme has been used on concrete prisms with four different crack widths. The depth of carbonation (DoC), apparent pH, and consumption of alkalinity (OH-) is investigated in accordance with the BS EN13295:2004 [1] and the method proposed by Mc Polin et al. [2]. The influence of replacing ordinary Portland cement (OPC) by pulverized fuel ash (PFA) and ground granulated blast furnace slag (GGBS) on the CO2 diffusivity in cracked concrete, is also analyzed and presented in this paper. The results have shown a strong relationship between DoC and the alkalinity level (consumed OH-) and pH of concrete structures. There is a considerable impact of crack width on the reduction in concrete alkalinity. The results also demonstrate a significant increase in consumption of OH- and reduction in pH owing to the addition of supplementary materials in the samples.
Original languageEnglish
Number of pages12
Publication statusPublished - 12 Jun 2019
EventEuroCoalAsh2019 - University of Dundee, Dundee, United Kingdom
Duration: 10 Jun 201912 Jun 2019
https://www.conventiondundeeandangus.co.uk/attending/conferences/eurocoalash2019

Conference

ConferenceEuroCoalAsh2019
CountryUnited Kingdom
CityDundee
Period10/06/1912/06/19
Internet address

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Alkalinity
Concrete construction
Carbon dioxide
Concretes
Cracks
Carbonation
Ashes
Pulverized fuel
Portland cement
Prisms
Service life
Slags
Reinforced concrete
Reinforcement
Durability
Corrosion

Cite this

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title = "Effect of cracks on alkalinity level of concrete structures exposed to carbon dioxide environment condition",
abstract = "Reduction of alkalinity of concrete due to the diffusivity of carbon dioxide (CO2) and concrete carbonation is one of the major issues influencing the durability of reinforced concrete structures. Most of the previous studies have concentrated on the un-cracked / unloaded concrete although it has been acknowledged that structural cracks in concrete have an impact on the CO2 diffusivity and carbonation - induced reinforcement corrosion as well as service life of concrete structures. Hence, this article aims to investigate the effect of cracks (produced by loading) in concrete exposed to the CO2 environment condition, on the alkalinity level (apparent pH) and carbonation depth in concrete. Accelerated environmental test programme has been used on concrete prisms with four different crack widths. The depth of carbonation (DoC), apparent pH, and consumption of alkalinity (OH-) is investigated in accordance with the BS EN13295:2004 [1] and the method proposed by Mc Polin et al. [2]. The influence of replacing ordinary Portland cement (OPC) by pulverized fuel ash (PFA) and ground granulated blast furnace slag (GGBS) on the CO2 diffusivity in cracked concrete, is also analyzed and presented in this paper. The results have shown a strong relationship between DoC and the alkalinity level (consumed OH-) and pH of concrete structures. There is a considerable impact of crack width on the reduction in concrete alkalinity. The results also demonstrate a significant increase in consumption of OH- and reduction in pH owing to the addition of supplementary materials in the samples.",
author = "Abbas AL-Ameeri and Rafiq, {M. Imran} and Ourania Tsioulou",
year = "2019",
month = "6",
day = "12",
language = "English",
note = "EuroCoalAsh2019 ; Conference date: 10-06-2019 Through 12-06-2019",
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AL-Ameeri, A, Rafiq, MI & Tsioulou, O 2019, 'Effect of cracks on alkalinity level of concrete structures exposed to carbon dioxide environment condition' Paper presented at EuroCoalAsh2019, Dundee, United Kingdom, 10/06/19 - 12/06/19, .

Effect of cracks on alkalinity level of concrete structures exposed to carbon dioxide environment condition. / AL-Ameeri, Abbas; Rafiq, M. Imran; Tsioulou, Ourania.

2019. Paper presented at EuroCoalAsh2019, Dundee, United Kingdom.

Research output: Contribution to conferencePaperResearchpeer-review

TY - CONF

T1 - Effect of cracks on alkalinity level of concrete structures exposed to carbon dioxide environment condition

AU - AL-Ameeri, Abbas

AU - Rafiq, M. Imran

AU - Tsioulou, Ourania

PY - 2019/6/12

Y1 - 2019/6/12

N2 - Reduction of alkalinity of concrete due to the diffusivity of carbon dioxide (CO2) and concrete carbonation is one of the major issues influencing the durability of reinforced concrete structures. Most of the previous studies have concentrated on the un-cracked / unloaded concrete although it has been acknowledged that structural cracks in concrete have an impact on the CO2 diffusivity and carbonation - induced reinforcement corrosion as well as service life of concrete structures. Hence, this article aims to investigate the effect of cracks (produced by loading) in concrete exposed to the CO2 environment condition, on the alkalinity level (apparent pH) and carbonation depth in concrete. Accelerated environmental test programme has been used on concrete prisms with four different crack widths. The depth of carbonation (DoC), apparent pH, and consumption of alkalinity (OH-) is investigated in accordance with the BS EN13295:2004 [1] and the method proposed by Mc Polin et al. [2]. The influence of replacing ordinary Portland cement (OPC) by pulverized fuel ash (PFA) and ground granulated blast furnace slag (GGBS) on the CO2 diffusivity in cracked concrete, is also analyzed and presented in this paper. The results have shown a strong relationship between DoC and the alkalinity level (consumed OH-) and pH of concrete structures. There is a considerable impact of crack width on the reduction in concrete alkalinity. The results also demonstrate a significant increase in consumption of OH- and reduction in pH owing to the addition of supplementary materials in the samples.

AB - Reduction of alkalinity of concrete due to the diffusivity of carbon dioxide (CO2) and concrete carbonation is one of the major issues influencing the durability of reinforced concrete structures. Most of the previous studies have concentrated on the un-cracked / unloaded concrete although it has been acknowledged that structural cracks in concrete have an impact on the CO2 diffusivity and carbonation - induced reinforcement corrosion as well as service life of concrete structures. Hence, this article aims to investigate the effect of cracks (produced by loading) in concrete exposed to the CO2 environment condition, on the alkalinity level (apparent pH) and carbonation depth in concrete. Accelerated environmental test programme has been used on concrete prisms with four different crack widths. The depth of carbonation (DoC), apparent pH, and consumption of alkalinity (OH-) is investigated in accordance with the BS EN13295:2004 [1] and the method proposed by Mc Polin et al. [2]. The influence of replacing ordinary Portland cement (OPC) by pulverized fuel ash (PFA) and ground granulated blast furnace slag (GGBS) on the CO2 diffusivity in cracked concrete, is also analyzed and presented in this paper. The results have shown a strong relationship between DoC and the alkalinity level (consumed OH-) and pH of concrete structures. There is a considerable impact of crack width on the reduction in concrete alkalinity. The results also demonstrate a significant increase in consumption of OH- and reduction in pH owing to the addition of supplementary materials in the samples.

M3 - Paper

ER -