Abstract
This study investigated improving bamboo–concrete bond by increasing mechanical interlock. Pull-out tests were used to measure the bond between bamboo and concrete. Corrugated and non-corrugated bamboo splints were tested, with four different patterns of corrugation. The effectiveness of using linseed oil for waterproofing corrugated and non-corrugated bamboo splints was also investigated. The bond stress and slip at the loaded and free ends were measured and recorded. The results show that the bamboo–concrete bond can be improved with the use of waterproofed corrugated bamboo splints. The bond achieved using waterproofed corrugated bamboo splints was comparable to the bond achieved using splints treated with expensive epoxy treatments. Although certain patterns were found to be more effective in achieving a strong bond with concrete, all the corrugation patterns with 2 mm projections achieved better results in comparison with non-corrugated splints. Linseed oil was found to be effective in improving the bond between corrugated splints and concrete.
Highlights
With exponentially increasing demands for materials by a growing world population, scientists around the globe are looking for affordable and sustainable materials to use in the construction industry
The results show that the bamboo–concrete bond can be improved with the use of waterproofed corrugated bamboo splints
While linseed oil improved the bond of the non-corrugated splints by 26%, it improved the bond of the corrugated splints with 2 mm projections and B:A = 1:1 by 73%
Summary
With exponentially increasing demands for materials by a growing world population, scientists around the globe are looking for affordable and sustainable materials to use in the construction industry. (b) The smooth surface of the bamboo minimises friction and allows the splints to slip without the development of a strong bond Another possible cause of the weak bamboo–concrete bond is bond degradation due to the alkalinity of concrete. A few researchers investigated waterproofing bamboo to limit the expansion and shrinkage due to moisture changes and studied the effect of roughening the bamboo surface to increase friction This resulted in a stronger bond (Table 1). Richard (2013) tested Moso bamboo specimens and reported a shear strength of 14·2 MPa. Steel’s excellent bond to concrete is mainly caused by mechanical interlock 2012), and mechanical interlock is the reason why splints with nodes in the embedded length had a 23% stronger bond relative to splints without nodes (Table 1)
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