Abstract
Sawdust-reinforced ice-filled flax fiber-reinforced polymer (FRP) tubular (SIFFT) columns are newly proposed to be used as structural components in cold areas. A SIFFT column is composed of an external flax FRP tube filled with sawdust-reinforced ice. The compressive behavior of circular SIFFT short columns was systematically investigated. Four types of short columns with circular sections, including three plain ice specimens, three sawdust-reinforced ice specimens (a mixture of 14% sawdust and 86% ice in weight), nine plain ice-filled flax FRP tubular (PIFFT) specimens and nine SIFFT specimens, were tested to assess the concept of the innovative composite columns. The test variables were the thickness of flax FRP tubes and the type of ice cores. The test results indicated that the lateral dilation and the development of cracks of the ice cores were effectively suppressed by outer flax FRP tubes, thus causing a considerable enhancement in the compressive strength. Moreover, the compressive behavior, energy-absorption capacity, and anti-melting property of sawdust-reinforced ice cores were better than those of plain ice cores confined by flax FRP tubes with the same thicknesses. The proposed equations for estimating ultimate bearing capacities of PIFFT and SIFFT short columns were shown to provide reasonable and accurate predictions.
Highlights
The low temperature in cold areas tremendously limits the use of traditional building materials, especially concrete
Yan and Chouw [35] investigated the axial compressive performance of the coir fiber-reinforced concrete-filled flax fiber-reinforced polymer (FRP) tubes, which revealed that the compressive strength and the ductility of the coir fiber-reinforced concrete cores were substantially improved by the additional confinement from flax FRP tubes
Xia et al [37] studied the behavior of self-compacting concrete-filled flax FRP tubular columns under static and cycle compression, which confirmed that the compressive strength and the ultimate axial strain of filament-wound flax FRP-confined concrete were increased with the increase of tube thickness
Summary
The low temperature in cold areas tremendously limits the use of traditional building materials, especially concrete. Yan and Chouw [35] investigated the axial compressive performance of the coir fiber-reinforced concrete-filled flax FRP tubes, which revealed that the compressive strength and the ductility of the coir fiber-reinforced concrete cores were substantially improved by the additional confinement from flax FRP tubes. Xia et al [37] studied the behavior of self-compacting concrete-filled flax FRP tubular columns under static and cycle compression, which confirmed that the compressive strength and the ultimate axial strain of filament-wound flax FRP-confined concrete were increased with the increase of tube thickness. SIFFT column is a novel structural member with less environmental pollution: (a) ice is a clean material, readily available in cold areas, which becomes water after melting without pollution [39]; (b) natural fibers (i.e., flax fibers and wood waste sawdust) used in this study are biodegradable materials. Equations were proposed to predict the ultimate bearing capacities of circular plain ice-filled flax FRP tubular (PIFFT) short columns and circular sawdust-reinforced ice-filled flax FRP tubular (SIFFT) short columns
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