| dc.description.abstract | The purpose of this thesis has been to investigate ice abrasion properties for three different repair mortars, and evaluate their behavior and properties in relation to a typical B60 offshore concrete and a B70 concrete. Bond strength to a B60 concrete has been tested for all mortars. To increase understanding and knowledge in the field of research, a literature study was made. Roughness parameters, bond strength properties and parameters affecting ice abrasion resistance were reviewed. Testing equipment and procedures are described for ice abrasion and bond strength tests. Test conditions were chosen to evaluate the influence of sliding distance, contact pressure, sliding velocity and initial surface roughness on the abrasion rate. Seven different products; Densit, Reforcetech, Rockbond, B60 concrete, B70 concrete, MapeCoat (elastic epoxy) and Polyurethane (rigid epoxy) are ice abrasion tested. MapeCoat and Polyurethane showed no visible signs of abrasion, while all repair mortars were found to have significantly higher abrasion resistance than the standard B60 reference concrete. Observed abrasion rate [mm/km]were 0,011-0,026 for Densit, 0,014-0,033 for Reforcetech, 0,024-0,041 for Rockbond, 0,024-0,052 for B70 and 0,025-0,090 for B60. Bond tests are performed according to NS-EN 1542. Average measured bond strength was 2,27 MPa for Densit, 1,82 MPa for Reforcetech and 2,93 MPa for Rockbond. All tested repair mortars are found to have good abrasion resistance and bond strength and should therefore be suitable as offshore repair products on ice abrasion exposed structures. High compressive strength, density and the use of steel reinforcement fibers are parameters found to reduce abrasion | nb_NO |
