IMPROVEMENT OF SELF-HEALING EFFICIENCY IN ENGINEERED CEMENTITIOUS COMPOSITES BY ADDITION OF FOREST BIOMASS ASH

Author(s): Gloria Perez (1), José Luis García Calvo (1), Pedro Carballosa (1), Ana Guerrero (1)
Paper category: Proceedings
Book title: SynerCrete’18 International Conference on Interdisciplinary Approaches for Cement-based Materials and Structural Concrete
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 1091-1096
Total Pages: 6
Language : English

Abstract: Self-healing efficiency of an Engineered Cementitious Composite (ECC) in which fly ash is partially substituted by a forest biomass ash was studied in the present work. Prismatic specimens were fabricated with a ratio of fly ash to biomass ash content of 70/30 (material A) and 30/70 (material B). After 28 days of curing in a humidity chamber, some specimens were cracked and left back in the same previous conditions for self-healing during more than 8 months. The results from capillary water absorption tests suggest a higher initial tightness for the uncracked material with a higher content of fly ash, while after the healing period, a higher healing efficiency is inferred for the ECC matrix with higher content of biomass ash. The study of the self-healing mechanism by electron microscopy with compositional analysis indicates that sealing is promoted by reaction products deposited on the fibres bridging the cracks and by crystalline phases incorporating sulphur. The higher content of this element in the composition of biomass ash, as compared to fly ash, explains the higher crack healing efficiency in material B.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00