Expedient reinforcement of concrete for use in Southeast Asia. Report 1, Preliminary tests of bamboo
Cox, F. B. (Frank B.); Geymayer, H. G.
Technical reportAbstract: This report summarizes the preliminary results of a current U. S. Army Engineer Waterways Experiment Station (WES) study of the feasibility of using bamboo as an expedient reinforcement for temporary, reinforced concrete structures. The report contains an extensive review of the literature, a description of the test procedures, results of an investigation of the most important engineering properties of bamboo, descriptions of tests of 26 bamboo-reinforced structural elements- (20-simply-supported-beams with 6-ft (1.83-m) spans, and 6 simply supported two-way slabs of varying length, width, and depth), and conclusions and tentative recommendations for the design of bamboo-reinforced structures. The recommended procedures are based on results obtained from tests of local (Mississippi) small cane (Arundinaria tecta), and are believed to be conservative when other species of bamboo are used because both of the properties of the small cane were generally somewhat lower than the properties reported by others for other species. Some of the principal conclusions are: a. Although bamboo has a fairly high tensile strength (values as high as 53,894 psi or 3,789 kg/cm have been reported), its tensile modulus of elasticity is relatively low (usually less than 1/10 of that of conventional steel reinforcement). This low tensile modulus leads to large deflections and wide cracks when bamboo-reinforced structures are loaded to capacity. b. The principal problems associated with bamboo reinforcement are volume changes tie swelling and shrinking) due to moisture variations, low bond strength, and possibly decay. However, if special precautions are taken in preparing and placing the culms (such as splitting, presoaking for 72 hr, coating, etc.), these problems can be minimized. c. Bamboo-reinforced members that are designed and constructed according to the tentative recommendations outlined herein can be expected to develop from two to four times the ultimate flexural load-carrying capacity of unreinforced members of equal dimensions.
Concrete Laboratory (U.S.)Engineer Research and Development Center (U.S.)
Bamboo; Concrete structures; Reinforced concrete; Southeast Asia
Technical report (U.S. Army Engineer Waterways Experiment Station) ; C-69-3 rept.1.
Approved for public release; distribution is unlimited.