SELF-HEALING CAPACITY OF A STRAIN-HARDENING CEMENTBASED COMPOSITE (SHCC) WITH BACTERIA

Author(s): M.G. Sierra Beltran, H.M. Jonkers and E. Schlangen
Book Title: Seventh International RILEM Conference on High Performance Fiber Reinforced Cement Composites (HPFRCC7)
Editor: H.W. Reinhardt, G.J. Parra-Montesinos, H. Garrecht
ISBN: 978-2-35158-145-2
e-ISBN: 978-2-35158-146-9
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 235-242
Total Pages: 8
Language: English

Abstract: This paper investigates the self-healing capacity of a strain-hardening cement-based composite (SHCC) with a bio-based agent designed for the application as a material for concrete patch repair. The bio-based agent consists of alkaliphilic bacteria together with an organic food source for the bacteria. Bacterially mediated calcite precipitation has been successfully applied in self-healing concrete thanks to metabolic conversion of calcium lactate. The same concept is now introduced to develop a mortar repair system for concrete structures. The self-healing capacity is investigated here by means of regain of mechanical properties in pre-cracked and healed samples. The calcite precipitation in the crack mouths was analysed with FTIR. At the end of the healing period, polished sections were observed with ESEM/EDS to analyse the precipitated bio-minerals inside the cracks. The FTIR results coupled with ESEM observations showed that CaCO3 was formed in the cracks.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00