Cement substitution by a recycled cement paste fine: Role of the residual anhydrous clinker

Published Date
1 February 2017, Vol.132:1–8, doi:10.1016/j.conbuildmat.2016.11.080

Author 

Arthur Bordy ^a,

Akli Younsi ^b,

Salima Aggoun ^a,,

Bruno Fiorio ^a,

aUniversity of Cergy-Pontoise, L2MGC, 5 Mail Gay-Lussac, 95031 Cergy-Pontoise Cedex, France

bUniversity of La Rochelle, CNRS, LaSIE, UMR-7356, Avenue Michel Crépeau, 17042 La Rochelle Cedex 1, France

Received 23 August 2016. Revised 2 November 2016. Accepted 15 November 2016. Available online 1 December 2016. 

Highlights

• RCPF just fills the granular gap left by the substituted cement in mortar mixtures.
• •
  RCPF contains around 24% of a reactive residual anhydrous clinker.
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  RCPF contributes in the hydration process through its anhydrous clinker.
• •
  RCPF contributes in the mechanical properties through its anhydrous clinker.
• •
  RCPF contributes in the carbonation resistance through its anhydrous clinker.

Abstract

This paper reports on an experimental study conducted on mortars designed with substitution of Portland cement by a recycled cement paste fine (RCPF) obtained from crushing, grinding and 80-μm sieving of a laboratory-made cement paste. The obtained results show that in terms of fineness, particle size distribution, CaCO₃content, hydration kinetics, total porosity and mechanical properties, the use of RCPF as partial substitution of cement should not provide any additional filler effect and nucleation sites compared to the replaced cement. The results show also that RCPF contains around 24% of a reactive residual anhydrous clinker which contributes in the hydration process, the mechanical properties and the resistance against carbonation.

Keywords

Portland cement

Cement paste

Recycled cement paste fine

Anhydrous clinker

Mortar mixture

Hydration temperature

Portlandite content

Total porosity

Compressive strength

Carbonation depth

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  Corresponding author.
  
  

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