Investigating mechanical and bonding properties of micro/nano filler containing epoxy adhesives for anchoring steel bar in concrete. (20th April 2020)

• Record Type: Journal Article
• Authors: Bagherzadeh, A.; Jamshidi, M.; Monemian, F.
• Is Part Of: Construction & building materials. Volume 240(2020)
• Publication Date: 2020-04-20
• Subjects: Epoxy adhesive -- Pull-out test -- Anchoring in concrete -- Micro/nano filler -- Mechanical properties; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2019.117979
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Micro and nano filler containing epoxy adhesives were made for anchoring steel bar in concrete. The mechanical/bonding properties of the adhesives to concrete base were studied. Effect of hybrid of micro silica particles with different sizes on properties were studied. Effect of humidity of micro silica on thermal/mechanical properties of adhesives were evaluated. Abstract: In this study, effect of incorporating different sizes of silica microparticles (i.e. with mesh sizes of 100, 200, 400 and 600) and their hybrids on the properties of the epoxy composite adhesives was investigated. To determine the performance of the micro silica-based epoxy adhesives, their mechanical (i.e. the compressive, tensile and flexural) properties and adhesion to concrete and steel bar (i.e. pullout test) were evaluated. Meanwhile, the effect of surface humidity of micro silica particles on the mechanical properties of the epoxy adhesive were assessed. Hereafter, SiO2 and CaCO3 nanoparticles at 1, 3 and 5 wt% were applied to the micro silica-based composites and the mechanical and pull-out properties were determined. Results showed that moisture content were negligible in micro silica particles but it caused 7, 40 and 25% decline in the tensile modulus, flexural strength and flexural modulus of the epoxy samples compared to the samples with dried micro silica. Using micro silica particles with mesh 600 in epoxy binder caused the best performances in the epoxy composites and improved 266, 205, 60 and 102% the compressive strength, compressive modulus, tensile and flexural modulus, respectively. Hybridizing micro silica particles with different sizes had significant effect on the adhesive mechanical properties. Incorporating nano CaCO3 to the composites containing micro silica just improved compressive strength but had small impact on other properties. Finally, using nano SiO2 along with micro silica due to its incompatibility with epoxy resin caused considerable diminution in the mechanical and bonding properties especially at higher loading contents.