TY - JOUR
T1 - Influence of nano-silica on the microstructural and mechanical properties of high-performance concrete of containing EAF aggregate and processed quarry dust
AU - Jagadisha, Achar
AU - Rao, K. Balakrishna
AU - Nayak, Gopinatha
AU - Kamath, Muralidhar
N1 - Funding Information:
The authors would like to thank M/S Jindal Steel Works, Bellary-India, for providing EAF aggregate. The authors also would like to thank the Department of Civil Engineering, Manipal Institute of Technology, MAHE-Manipal, Karnataka, India, for letting us use the necessary facilities to conduct experiments. The authors would like to extend thanks to Government Engineering College Majali Karwar, Karnataka and Department of Technical Education, Palace Road, Bangalore, Karnataka, and AICTE-New Delhi for supporting our research program. The authors also thank Dr. Murari M. S. Scientific Officer, DST-PURSE Program Mangalore University, for performing FE-SEM and EDX equipment. The authors would also like to acknowledge for XRD and FT-IR to central institute facility, Manipal Institute of Technology, MAHE and DST-FIST Program, Department of Atomic and Molecular Physics, Manipal Institute of Technology, MAHE- Manipal, Karnataka, India.
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/10/18
Y1 - 2021/10/18
N2 - The present study investigates nano-silica (NS) in ternary binder composite and the influence of the same on Electrical Arc Furnace (EAF) slag coarse aggregate-based various high-performance concrete (HPC) mixes. Processed Quarry Dust (PQD) was used as fine aggregate throughout the investigation to limit the consumption of natural river sand and make HPC more sustainable. Control HPC was designed using the Ordinary Portland Cement (OPC)- Ground Granulated Blast Furnace Slag (GGBS) binary binder and various replacement levels of natural crushed granite rock aggregate by EAF coarse aggregate. Additionally, the binary binder composite was added with colloidal nano-silica to achieve high strength HPC. A microstructure study was carried out on paste samples of OPC, OPC with GGBS, and OPC, GGBS with the inclusion of nano-silica. FESEM, EDX, XRD, FTIR, and TGA results showed that the addition of nano-silica has significantly enriched the microstructure characteristics of the binder system. The slump flow of HPC mixes decreased drastically with the inclusion of nano-silica and EAF aggregate. Mechanical properties viz., compressive strength, split tensile strength, flexural strength, and modulus of elasticity of HPC mixes containing EAF and nano-silica have exhibited superior results due to the synergetic effect of nano-silica as well as the more robust physical characteristics of EAF aggregate compared to natural crushed granite rock aggregate. The UPV values and water absorption tests have shown that nano-silica positively affects the binder composite system.
AB - The present study investigates nano-silica (NS) in ternary binder composite and the influence of the same on Electrical Arc Furnace (EAF) slag coarse aggregate-based various high-performance concrete (HPC) mixes. Processed Quarry Dust (PQD) was used as fine aggregate throughout the investigation to limit the consumption of natural river sand and make HPC more sustainable. Control HPC was designed using the Ordinary Portland Cement (OPC)- Ground Granulated Blast Furnace Slag (GGBS) binary binder and various replacement levels of natural crushed granite rock aggregate by EAF coarse aggregate. Additionally, the binary binder composite was added with colloidal nano-silica to achieve high strength HPC. A microstructure study was carried out on paste samples of OPC, OPC with GGBS, and OPC, GGBS with the inclusion of nano-silica. FESEM, EDX, XRD, FTIR, and TGA results showed that the addition of nano-silica has significantly enriched the microstructure characteristics of the binder system. The slump flow of HPC mixes decreased drastically with the inclusion of nano-silica and EAF aggregate. Mechanical properties viz., compressive strength, split tensile strength, flexural strength, and modulus of elasticity of HPC mixes containing EAF and nano-silica have exhibited superior results due to the synergetic effect of nano-silica as well as the more robust physical characteristics of EAF aggregate compared to natural crushed granite rock aggregate. The UPV values and water absorption tests have shown that nano-silica positively affects the binder composite system.
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U2 - 10.1016/j.conbuildmat.2021.124392
DO - 10.1016/j.conbuildmat.2021.124392
M3 - Article
AN - SCOPUS:85113608273
SN - 0950-0618
VL - 304
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 124392
ER -