Title:
Self-Healing of Cementitious Composites to Reduce High CO2 Emissions
Author(s):
M. Sahmaran, G. Yıldırım, G. Hasıloglu Aras, S. Bahadır Keskin, O. K. Keskin, and M. Lachemi
Publication:
Materials Journal
Volume:
114
Issue:
1
Appears on pages(s):
93-104
Keywords:
carbonation; CO2-rich environment; electrical properties; engineered cementitious composites (ECCs); self-healing
DOI:
110.14359/51689484
Date:
1/1/2017
Abstract:
Existing concrete structures worldwide are suffering from deterioration/distress. With ever-growing urban population and global warming, higher CO2 concentrations in the atmosphere are likely to further weaken the chemical stability of concrete material, and it is very important to understand how its effects will impair the material. To help moderate the harmful effects of increased CO2 concentrations, an experimental study was undertaken in which efforts were made to accelerate the capability of engineered cementitious composites (ECCs) with different pozzolanic materials (PMs) to self-heal its own damage (for example, cracks) in a CO2-rich environment. Self-healing was assessed by electrical impedance (EI) and rapid chloride permeability tests (RCPTs) on 28-day-old specimens. Experimental findings show that self-healing in a CO2-rich environment is more pronounced than it is in normal atmospheric conditions. The findings also show that PM type can be very decisive on self-healing performance in a CO2-rich environment, depending on testing method. Results suggest that proper material design can lead to the development of environmentally friendly ECC options with superior mechanical and durability characteristics.
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