Addition of biomass ash in concrete: Effects on E-Modulus, electrical conductivity at early ages and their correlation. (30th December 2017)

• Record Type: Journal Article
• Authors: Velay-Lizancos, Mirian; Azenha, Miguel; Martínez-Lage, Isabel; Vázquez-Burgo, Pablo
• Is Part Of: Construction & building materials. Volume 157(2017)
• Page Start: 1126
• Page End: 1132
• Publication Date: 2017-12-30
• Subjects: Biomass ash -- Concrete -- E-Modulus -- Non-destructive test -- Electrical conductivity; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2017.09.179
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: We study concretes with different percentages of cement replacement by biomass ashes. Biomass ash influences the evolution of E-Modulus at early ages. Addition of biomass ash has a strong negative effect on E-Modulus during the first day. The effect of 15% of biomass ash on the E-Modulus is negligible at 7 days. Electrical conductivity suggest a negative effect on resistance of chloride ion penetration. Abstract: This research aims to study the influence of biomass ashes in the evolution of E-Modulus at an early age (0–7 days) in concretes with different percentages of replacement of cement by biomass ash (0%, 15% and 30%). Its behaviour was evaluated through the continuous monitoring of the E-Modulus method as well as using a NDT: measurement of internal electrical conductivity. Whereas at 7 days the influence of a replacement of 15% of biomass ash on E-Modulus is negligible, during the first day the negative influence is very important, with values of loss of E-Modulus higher than 70%. The influence of the biomass ash in the evolution of internal electrical conductivity suggests that the biomass ash could reduce the chloride ion penetration resistance, even in concrete with 15% of biomass ash that did not induce a decrease of the E-Modulus at 7 days. The influence of the biomass ash in the correlations of E-Modulus and electrical conductivity has been studied. Maturity corrections were made.