TY - JOUR
T1 - Electrical and thermal characterisation of cement-based mortars containing recycled metallic waste
AU - Norambuena-Contreras, J.
AU - Quilodran, J.
AU - Gonzalez-Torre, I.
AU - Chavez, M.
AU - Borinaga-Treviño, R.
N1 - Funding Information:
The authors would like to acknowledge the help provided by Poldie Oyarzun and Olga Iturra from the Laboratory Analysis of Solids (L.A.S-UNAB) and the Laboratory of Civil Engineering from the University Andres Bello. In addition, the authors would like to thank José L. Concha from LabMAT from University of Bio-Bio for the technical support given, and the company Sika S.A. Chile for the provision of the superplasticiser additive. Finally, Roque Borinaga wishes to thank the Basque Government for financial assistance through IT919-16 and the European Horizon 2020, since this work was partially funded by Joint Technology Initiative Shift2Rail through contract no. 730841 .
PY - 2018/7/20
Y1 - 2018/7/20
N2 - The management and disposal of solid waste from industrial sources is a problem around the world. In recent years, several studies have been carried out to develop advanced construction materials based on the waste valorisation. As a result, building materials with self-healing and self-monitoring properties have been developed using electrically conductive metallic waste. Nevertheless, the addition of metallic waste may influence the electrical and thermal performance of the new building materials. This paper aims to evaluate the effect of the type and content of metallic waste (steel fibres and steel shavings) on the volumetric, electrical, and thermal properties of cement-based mortars designed with self-monitoring purposes. Physical, electrical, and thermal properties of cement-based mortars with four different contents of metallic waste were evaluated by measuring their bulk density, porosity, electrical resistivity, and thermal conductivity. In addition, metallic waste distribution inside the mortar specimens was measured by ultrasonic tests. All the properties were measured on specimens at two curing ages, 7 and 28 days. The main results showed that the addition of metallic waste produced a reduction of the bulk density and an increase of the porosity of cement-based mortars. Furthermore, it was proven that it is possible to evaluate the metallic waste distribution inside the mortars by ultrasound, and that this evaluation is more effective in specimens with fibres than in those with shavings. Likewise, it was proven that metallic waste can modify the electrical resistivity and the thermal conductivity of mortars, regardless of the type and amount of metallic waste. Finally, it was concluded that both the type and amount of metallic waste, and the curing time used in this research did not present a significant influence on the variation of the electrical resistivity and thermal conductivity of the evaluated cement-based mortars.
AB - The management and disposal of solid waste from industrial sources is a problem around the world. In recent years, several studies have been carried out to develop advanced construction materials based on the waste valorisation. As a result, building materials with self-healing and self-monitoring properties have been developed using electrically conductive metallic waste. Nevertheless, the addition of metallic waste may influence the electrical and thermal performance of the new building materials. This paper aims to evaluate the effect of the type and content of metallic waste (steel fibres and steel shavings) on the volumetric, electrical, and thermal properties of cement-based mortars designed with self-monitoring purposes. Physical, electrical, and thermal properties of cement-based mortars with four different contents of metallic waste were evaluated by measuring their bulk density, porosity, electrical resistivity, and thermal conductivity. In addition, metallic waste distribution inside the mortar specimens was measured by ultrasonic tests. All the properties were measured on specimens at two curing ages, 7 and 28 days. The main results showed that the addition of metallic waste produced a reduction of the bulk density and an increase of the porosity of cement-based mortars. Furthermore, it was proven that it is possible to evaluate the metallic waste distribution inside the mortars by ultrasound, and that this evaluation is more effective in specimens with fibres than in those with shavings. Likewise, it was proven that metallic waste can modify the electrical resistivity and the thermal conductivity of mortars, regardless of the type and amount of metallic waste. Finally, it was concluded that both the type and amount of metallic waste, and the curing time used in this research did not present a significant influence on the variation of the electrical resistivity and thermal conductivity of the evaluated cement-based mortars.
KW - Cement-based mortars
KW - Electrical resistivity
KW - Metallic waste
KW - Self-monitoring
KW - Thermal conductivity
KW - Ultrasonic time
UR - http://www.scopus.com/inward/record.url?scp=85047646448&partnerID=8YFLogxK
U2 - 10.1016/j.jclepro.2018.04.176
DO - 10.1016/j.jclepro.2018.04.176
M3 - Article
AN - SCOPUS:85047646448
VL - 190
SP - 737
EP - 751
JO - Journal of Cleaner Production
JF - Journal of Cleaner Production
SN - 0959-6526
ER -
