Abstract
The paper presents and analyzes the results of the underwater abrasion tests of Cementitious Acrylic Coating (CAC), which was used to protect the repaired surface of concrete dam and stilling basin of power-plant Moste on river Sava in Slovenia. Behavior of the CAC obtained with laboratory tests is rather similar to the behavior obtained after 1 year of application on the power-plant. Relatively good underwater abrasion resistance of CAC was obtained. Results of bond strength show that pressure of capillary water decreases bond between CAC and concrete surface. If such coating is additional loaded with abrasion forces, bond between those two layers becomes worse. Similar conclusions can be made on the basis of the obtained results of surface resistance to freeze-thaw test of CAC has been carried out. The resistance is rather good, but CAC separated from concrete surface, when water is present in the interface between the CAC and concrete surface during freeze-thaw loading.
Highlights
Concrete surfaces of dam and stilling basin of powerplant Moste on river Sava in Slovenia were damaged mainly due to underwater abrasion caused by waterborne particles, as well as due to freezing/thawing and weathering
The paper presents and analyzes the results of the underwater abrasion tests of Cementitious Acrylic Coating (CAC), which was used to protect the repaired surface of concrete dam and stilling basin of power-plant Moste on river Sava in Slovenia
Good grinding wear resistance A of the 44-day-old CAC was obtained with the Böhme test method, which is given in EN 13892-3
Summary
Concrete surfaces of dam and stilling basin of powerplant Moste on river Sava in Slovenia were damaged mainly due to underwater abrasion caused by waterborne particles, as well as due to freezing/thawing and weathering. All damaged concrete was removed and replaced by patching with trowel-applied polymercement mortar (PCM) and spraying-on new PCM layers. Repaired surfaces were protected by the Cementitious Acrylic Coating (CAC). Acrylic latex – modified hydraulic – cement mortars are used primarily in thin coatings for concrete restoration [1]. CAC is a two component flexible cementitious, mineral-based waterproofing slurry, which was applied manually by a brush to previously cleaned and damp surfaces in two layers. Thickness of the CAC was measured on the different locations of repaired surfaces. Average thickness of the applied CAC on the site is 1.20 mm. Once the repair work was completed, the Investor proposed that an evaluation of the durability of the applied CAC, in particular the evaluation of its resistance to underwater abrasion, should be made at our Institute IRMA.
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