Abstract

The paper presents bamboo scrimber bars as a reinforcing material instead of steel reinforcement in low-strength concrete columns. Twelve short concrete columns with different reinforcements are tested under axial compression load to study the axial compressive behavior of short concrete columns reinforced by bamboo scrimber. Three columns are reinforced concrete columns, and the other nine columns are bamboo scrimber reinforced concrete columns. The failure process, bearing capacity, axial deformation, and strain of the specimens are compared and analyzed. The results show that the bonding performance between the bamboo scrimber bars by surface treatment and low-strength concrete is excellent. In low-strength concrete columns, the material properties of bamboo bars play more thoroughly than those of steel bars. When the bamboo reinforcement ratio is increased, the concrete column ductility is significantly improved, but the bearing capacity of the concrete column is not increased. The bamboo scrimber bars with the size of 10 mm × 10 mm or 15 mm × 15 mm can be used as longitudinal bars of low-strength concrete columns. The ductility of the short concrete column with 2.56% bamboo scrimber reinforcement is close to that of the short concrete column with 0.72% steel reinforcement.

Highlights

  • Natural bamboo has a few defects, such as durability, water absorption, and shrinkage

  • Liu et al [12] proposed that bamboo scrimber bars could replace steel bars and were used to strengthen low-cost masonry houses in rural areas

  • Bamboo scrimber bars are cut from bamboo scrimber plates produced by Taohuajiang Bamboo Development Co., Ltd. in Yiyang city, China. e cross section of bamboo bars is 10 mm × 10 mm, 15 mm × 15 mm, and 20 mm × 20 mm, and the length of bamboo bars is 700 mm

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Summary

Experimental Program

All columns have 250 mm × 250 mm cross section in area and 750 mm in height, and the designed concrete strength is C10. E group GJ is steel-reinforced concrete columns, and the groups ZJA, ZJB, and ZJC are bamboo scrimber reinforced concrete columns. En all bamboo bars are treated with epoxy resin. After the epoxy resin is semidried, sand was evenly spread on the surface of the bamboo bars to enhance the bonding property between the bamboo bars and concrete. For specimens GJ, ZJA, ZJB, and ZJC, the measured concrete strength is 8.6 MPa, 8.6 MPa, 9.63 MPa, and 7.62 MPa, respectively

Test Scheme
Test Results and Discussion
Conclusions
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