Mechanism and Internal Stability of Supportive Stone Constructions
Klaus Voit1, Johannes Hron2, Gerhard Frei3
1Institute of Applied Geology, University of Natural Resources and Life Sciences, Peter Jordan-Street 82, 1190 Vienna, Austria.
Materials (Basel, Switzerland)
|May 20, 2022
Summary
This study investigated the bond strength between natural stones and concrete mortar in slope protection structures. Findings show that stone surface roughness positively impacts bond strength, aiding in the design of more stable structures.
Area of Science:
- Civil Engineering
- Geotechnical Engineering
- Materials Science
Background:
- Natural stone constructions are vital for slope, bank, and riverbed protection in infrastructure.
- Current designs require enhanced understanding of inner stability and structural design for these stone structures.
- Improving stone-to-mortar bond behavior is crucial for structural integrity.
Purpose of the Study:
- To experimentally determine force transmission and rock-concrete mortar interaction.
- To derive characteristic adhesion strength and friction angle values at various scales.
- To investigate the influence of rock surface roughness and concrete mortar properties on bond strength.
Main Methods:
- Direct shear testing to determine shear parameters, accounting for vertical and horizontal forces.
- Rock surface roughness analysis using visual methods (Joint Roughness Coefficient) and laser scanning.
- Characterization of fresh, hardened, and durability properties of concrete mortar.
Main Results:
- Different concrete mortars yield varying bond strengths (tensile and shear) with stone surfaces.
- Increased stone surface roughness positively correlates with higher tensile and shear strength.
- A failure description based on the Mohr-Coulomb fracture criterion was established for design calculations.
Conclusions:
- Stone surface roughness is a key factor in enhancing stone-mortar adhesion.
- The derived parameters enable improved structural design of protective stone bodies.
- On-site concrete mortar properties differ from conventional concrete due to installation constraints.
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