Calcium sulpho-aluminate (CSA) cements have received increasing scientific and technological interest in recent years both by the scientific and the industrial communities. Beside their interesting mechanical properties, they are considered as an environmental friendly alternative to Portland cement [1-2]. Most of the considerations on the low CO2 embodied energy of CSA cements is, however, referred to studies based on theoretical calculation by comparing the burning temperature and the enthalpy associated with the formation of different mineral phases compared to the well-known values of Portland cement clinker [3-4]. CSA cement can be used alone or in combination with Portland cement, in order to obtain a wide range of binders with different properties such as high early strength or low shrinkage [4]. In the last year, three products of the CSA family have obtained a CE mark [5] and an increasing number of studies was performed in order to assess the durability of CSA concrete. Without any doubt CSA clinker represents an innovative solution for lowering the CO2 emissions of the cement industry, however a more deep understanding of the mechanism associated to the durability of the CSA concrete is needed. Specifically, in order to prove the environmental friendliness of this innovative binder and allow a successful diffusion of CSA in the market of structural concrete, the corrosion behaviour of steel embedded in concrete made with this type of binder needs to be investigated. Indeed, due to the lower alkalinity of CSA cements compared to Portland cement, there is some concern regarding the carbonation and steel passivation phenomena.

Steel corrosion behaviour in real-size concrete elements prepared with sulpho-aluminate cements

CARSANA, MADDALENA;BERTOLINI, LUCA
2015-01-01

Abstract

Calcium sulpho-aluminate (CSA) cements have received increasing scientific and technological interest in recent years both by the scientific and the industrial communities. Beside their interesting mechanical properties, they are considered as an environmental friendly alternative to Portland cement [1-2]. Most of the considerations on the low CO2 embodied energy of CSA cements is, however, referred to studies based on theoretical calculation by comparing the burning temperature and the enthalpy associated with the formation of different mineral phases compared to the well-known values of Portland cement clinker [3-4]. CSA cement can be used alone or in combination with Portland cement, in order to obtain a wide range of binders with different properties such as high early strength or low shrinkage [4]. In the last year, three products of the CSA family have obtained a CE mark [5] and an increasing number of studies was performed in order to assess the durability of CSA concrete. Without any doubt CSA clinker represents an innovative solution for lowering the CO2 emissions of the cement industry, however a more deep understanding of the mechanism associated to the durability of the CSA concrete is needed. Specifically, in order to prove the environmental friendliness of this innovative binder and allow a successful diffusion of CSA in the market of structural concrete, the corrosion behaviour of steel embedded in concrete made with this type of binder needs to be investigated. Indeed, due to the lower alkalinity of CSA cements compared to Portland cement, there is some concern regarding the carbonation and steel passivation phenomena.
2015
IBAUSIL 19. International Baustofftagung
File in questo prodotto:
File Dimensione Formato  
2015_IBAUSIL-CSA.pdf

Accesso riservato

: Publisher’s version
Dimensione 701.59 kB
Formato Adobe PDF
701.59 kB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/986299
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact