Effects of interface roughness and interface adhesion on new-to-old concrete bonding

He, Yan; Zhang, Xiong; Hooton, R.D.; Zhang, Xiaowei

doi:10.1016/j.conbuildmat.2017.05.049

Cited by 187 publications

(68 citation statements)

References 28 publications

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“…It should be underlined that different relations were observed during our studies of the mortars than for mineral bases. As already reported [ 41 , 42 , 43 ], the high roughness and the porosity of the base ensure a good coating.…”

Section: Discussionsupporting

confidence: 67%

Impact of Different Binders on the Roughness, Adhesion Strength, and Other Properties of Mortars with Expanded Cork

et al. 2018

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The aim of the research that is presented in this paper was to evaluate the physical and mechanical properties of heat-insulating mortars with expanded cork aggregates and different binders. In this work, the measurements of surface roughness and adhesion strength, supported by determination of basic mechanical and physical parameters, such as density, bulk density, open porosity, total porosity, absorbability, thermal conductivity coefficient, compressive strength, flexural strength, and frost resistance of mortars containing expanded oak cork, were performed. The scanning electron microscope (SEM) investigations demonstrated the microstructure, contact zone, and distribution of pores in the heat-insulating mortars containing expanded cork. The results indicated that the addition of expanded cork and different binders in heat-insulating mortars triggers changes in their roughness and adhesion strength. The SEM research confirmed the very good adhesion of the paste to the cork aggregate.

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Section: Discussionsupporting

confidence: 67%

Impact of Different Binders on the Roughness, Adhesion Strength, and Other Properties of Mortars with Expanded Cork

et al. 2018

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“…It is known that porosity can have a marked effect on the interfacial bond [38,39]. The bond strength of the concrete-to-concrete interface is also influenced by adhesion including substrate condition, overlay compaction, and curing procedures [40,41,42,43]. More generally, an increase in porosity results in a proportional decrease of strength in quasi-brittle materials [44].…”

Section: Resultsmentioning

confidence: 99%

The Effect of Material Fresh Properties and Process Parameters on Buildability and Interlayer Adhesion of 3D Printed Concrete

et al. 2019

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The advent of digital concrete fabrication calls for advancing our understanding of the interaction of 3D printing with material rheology and print parameters, in addition to developing new measurement and control techniques. Thixotropy is the main challenge associated with printable material, which offers high yield strength and low viscosity. The higher the thixotropy, the better the shape stability and the higher buildability. However, exceeding a minimum value of thixotropy can cause high extrusion pressure and poor interface bond strength if the printing parameters are not optimized to the part design. This paper aims to investigate the effects of both material and process parameters on the buildability and inter-layer adhesion properties of 3D printed cementitious materials, produced with different thixotropy and print head standoff distances. Nano particles are used to increase the thixotropy and, in this context, a lower standoff distance is found to be useful for improving the bond strength. The low viscosity “control” sample is unaffected by the variation in standoff distances, which is attributed to its flowability and low yield stress characteristics that lead to strong interfacial bonding. This is supported by our microscopic observations.

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“…microelectronics, microsystem engineering, energy, photonics, tribology, tissue engineering and biomedical devices [1][2][3][4][5][6][7][8][9]. Contact mechanics related problems, such as the uncontrolled adhesion of surfaces with complex shape and geometries, hugely affects the products and their applications in these sectors [10][11][12][13][14]. These problems arise from intertwined physicochemical properties of the contacting surfaces and the interfaces between them.…”

Section: Introductionmentioning

confidence: 99%

A novel nanoindentation protocol to characterize surface free energy of superhydrophobic nanopatterned materials

Rossi

Phani

Guillemet

et al. 2021

Journal of Materials Research

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Surface Free Energy (SFE) has become a relevant design parameter to produce materials and devices with controlled wettability. The non-destructive measurement of SFE in nanopatterned super-hydrophobic hard surfaces is a challenge in both research and industry since in most cases time-consuming contact angle measurements are not feasible. In this work, we present a novel nanoindentation based method for the measurement of pull-off adhesive forces by carefully controlling environmental and instrumentation issues. The method is found to measure SFE over five orders of magnitude, covering hydrophilic to super-hydrophobic surfaces, and has been validated with contact angle measurements. Its limitations and shortcomings are critically discussed, with a specific focus on the experimental issues that could affect the reliability and reproducibility of the results. Finally, the potential applications of the newly developed methodology include fast non-destructive mapping of SFE over heterogeneous surfaces with spatially controlled wettability. Graphic abstract

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Effects of interface roughness and interface adhesion on new-to-old concrete bonding

Cited by 187 publications

References 28 publications

Impact of Different Binders on the Roughness, Adhesion Strength, and Other Properties of Mortars with Expanded Cork

Impact of Different Binders on the Roughness, Adhesion Strength, and Other Properties of Mortars with Expanded Cork

The Effect of Material Fresh Properties and Process Parameters on Buildability and Interlayer Adhesion of 3D Printed Concrete

A novel nanoindentation protocol to characterize surface free energy of superhydrophobic nanopatterned materials

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