For different coating lengths of the same (20 mm) thickness (Fig. 6a, c, and d), similar damage modes are observed except that NHS-SS-Biotin more transverse cracks occur in longer coatings.
3.2. Axial compressive loading test
Fig. 7 shows the tests while the steel members are under axial compression. To avoid local and overall bucking in the steel members due to initial eccentricity, a mini-column is fabricated from 8 mm thick steel plates as illustrated in Fig. 7a.
Fig. 7. Axial compressive loading test on cementitious material coated steel members: (a) specimen dimension; (b) test setup; (c) coating-steel interfacial cracks; (d) coating peeling off.Figure optionsDownload full-size imageDownload as PowerPoint slide
When the silica average strain in the steel plates reaches approximately 0.2%, coating-steel interfacial cracks appear at top and bottom ends (Fig. 7c), and then propagate towards the centre with further increase of the load. When the steel strain reaches approximately 0.3%, cracks spreads all over the coating-steel interface but without any internal damage in the coatings. Soon after that, the coatings peel off as shown in Fig. 7d.