A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Carbonation or Chloride Ingress? Which One is the Durability Key Factor in Low Reactivity Clay and Limestone Blended Concrete
https://orcid.org/http://orcid.org/0000-0002-6543-1640
https://orcid.org/http://orcid.org/0000-0001-6110-9470
https://orcid.org/http://orcid.org/0000-0002-3210-589X
As Portland cement production is responsible for 0.8 ton of CO2 for 1 ton of clinker produced, there is currently a strong global pressure to reduce its production in order to decrease greenhouse gas emissions. Although supplementary cementitious materials (SCMs) have been used massively, today in many countries there are some limitations in terms of the availability of traditional SCMs such as blast furnace slag and fly ash. Recently, limestone and calcined clay cements (LC3) have emerged as a viable alternative from a technical, economic and environmental point of view. These cements have become very attractive because low reactivity clay is practically found everywhere. In accordance with the above, this paper reports the results of a research aimed at understanding the key factors that controls the durability of LC3 concretes. Five LC3 blended mixes were formulated (SO3 content adjustment) and evaluated against carbonation and chloride ingress. Carbonation was measured in accelerated (3% CO2) and natural conditions simultaneously monitoring the reinforcement corrosion by linear polarization. Chloride ingress was assessed obtaining some transport properties such as the chloride migration coefficient from non-steady-state migration experiments and the chloride penetration from self-diffusion tests. Results showed that LC3 concretes have a high resistance against chloride penetration, increasing it notably with respect to the reference samples. Regarding corrosion resistance due to accelerated carbonation, LC3 concretes showed a lower performance which triggers an alert to evaluate its durability using also the carbonation exposure conditions and not only the chloride related properties.
Carbonation or Chloride Ingress? Which One is the Durability Key Factor in Low Reactivity Clay and Limestone Blended Concrete
https://orcid.org/http://orcid.org/0000-0002-6543-1640
https://orcid.org/http://orcid.org/0000-0001-6110-9470
https://orcid.org/http://orcid.org/0000-0002-3210-589X
As Portland cement production is responsible for 0.8 ton of CO2 for 1 ton of clinker produced, there is currently a strong global pressure to reduce its production in order to decrease greenhouse gas emissions. Although supplementary cementitious materials (SCMs) have been used massively, today in many countries there are some limitations in terms of the availability of traditional SCMs such as blast furnace slag and fly ash. Recently, limestone and calcined clay cements (LC3) have emerged as a viable alternative from a technical, economic and environmental point of view. These cements have become very attractive because low reactivity clay is practically found everywhere. In accordance with the above, this paper reports the results of a research aimed at understanding the key factors that controls the durability of LC3 concretes. Five LC3 blended mixes were formulated (SO3 content adjustment) and evaluated against carbonation and chloride ingress. Carbonation was measured in accelerated (3% CO2) and natural conditions simultaneously monitoring the reinforcement corrosion by linear polarization. Chloride ingress was assessed obtaining some transport properties such as the chloride migration coefficient from non-steady-state migration experiments and the chloride penetration from self-diffusion tests. Results showed that LC3 concretes have a high resistance against chloride penetration, increasing it notably with respect to the reference samples. Regarding corrosion resistance due to accelerated carbonation, LC3 concretes showed a lower performance which triggers an alert to evaluate its durability using also the carbonation exposure conditions and not only the chloride related properties.
Carbonation or Chloride Ingress? Which One is the Durability Key Factor in Low Reactivity Clay and Limestone Blended Concrete
https://orcid.org/http://orcid.org/0000-0002-6543-1640
https://orcid.org/http://orcid.org/0000-0001-6110-9470
https://orcid.org/http://orcid.org/0000-0002-3210-589X
As Portland cement production is responsible for 0.8 ton of CO2 for 1 ton of clinker produced, there is currently a strong global pressure to reduce its production in order to decrease greenhouse gas emissions. Although supplementary cementitious materials (SCMs) have been used massively, today in many countries there are some limitations in terms of the availability of traditional SCMs such as blast furnace slag and fly ash. Recently, limestone and calcined clay cements (LC3) have emerged as a viable alternative from a technical, economic and environmental point of view. These cements have become very attractive because low reactivity clay is practically found everywhere. In accordance with the above, this paper reports the results of a research aimed at understanding the key factors that controls the durability of LC3 concretes. Five LC3 blended mixes were formulated (SO3 content adjustment) and evaluated against carbonation and chloride ingress. Carbonation was measured in accelerated (3% CO2) and natural conditions simultaneously monitoring the reinforcement corrosion by linear polarization. Chloride ingress was assessed obtaining some transport properties such as the chloride migration coefficient from non-steady-state migration experiments and the chloride penetration from self-diffusion tests. Results showed that LC3 concretes have a high resistance against chloride penetration, increasing it notably with respect to the reference samples. Regarding corrosion resistance due to accelerated carbonation, LC3 concretes showed a lower performance which triggers an alert to evaluate its durability using also the carbonation exposure conditions and not only the chloride related properties.
Carbonation or Chloride Ingress? Which One is the Durability Key Factor in Low Reactivity Clay and Limestone Blended Concrete
RILEM Bookseries
Jędrzejewska, Agnieszka (editor) / Kanavaris, Fragkoulis (editor) / Azenha, Miguel (editor) / Benboudjema, Farid (editor) / Schlicke, Dirk (editor) / Lizarazo-Marriaga, Juan (author) / Salazar-Mayorga, Luis Felipe (author) / Peña-Cruz, Luis Eduardo (author)
International RILEM Conference on Synergising expertise towards sustainability and robustness of CBMs and concrete structures ; 2023 ; Milos Island, Greece
2023-06-09
12 pages
Article/Chapter (Book)
Electronic Resource
English
Concrete Containing Ternary Blended Binders: Resistance to Chloride Ingress and Carbonation
| British Library Online Contents | 1997
Concrete Containing Ternary Blended Binders: Resistance to Chloride Ingress and Carbonation
| Online Contents | 1997
Chloride Ingress With and Without Carbonation in Blended Cement Pastes
| British Library Conference Proceedings | 2001
| British Library Online Contents | 1999