Concrete Encased with Engineering Plastics

Abstract

Engineering plastic tubes are economic alternatives for the advanced composite tubing systems. The mechanical behavior of concrete-encased with engineering plastic tube (CFPT) is examined in the present study by testing short-stub CFPT columns under concentric loading. The test parameters include the plastic tube and coarse aggregate/cement ratio (a/c) ratio. Due to the low stiffness of plastic tubes, the cementitious systems have an important role to increase the stiffness of CFPT. For making concrete of consistent strength, a/c ratio is an important criterion since aggregate constitutes more than 70% of concrete. The proportion of this major component of concrete was altered in increments of 0.5 resulting in twelve mixes with a/c ratios from 3 to 8. Due to the limited test data, the mechanical performance of these structures continues to be pursued through experimental methods. The aim of the present study was to investigate experimentally the relationship between the strength of CFPT and a/c ratio which is also affected by variations in other constituent materials. The a/c ratio was the common variable in both control and CFPT specimens. The experimental results show that the ability of the engineering plastic tube in improving the load capacity of CFPT was considerably affected by the a/c ratio increment which yielded a beneficial effect on the tube confinement capacity.

Deformations of a plastic tube with concrete-infill under direct load

“…PTCI stub columns, with h/D ratio equal to 0.75, tested under axial compression load displayed in Fig. (3). The specimen underwent gradual deformations, and Figs.…”

“…A database of recent works executed in the period 2019-2020 was compiled. The database comprises nine papers [1,2,20,3,19,4,5,7,14] related to PTCI directly or indirectly. The number of test data for the strain of PTCI specimens reported in the literature is limited and less than those for strength.…”

“…The aggregate characteristics were reported to be influential parameters that affected short PTCI columns' performance under applied load [3]. In experimental work, two series of slender PTCI specimens were tested to assess the contribution of plastic tube (PT) in improving the ductility of concrete in PTCI specimens subjected to axial load [4].…”

Behaviour of Concrete-Filled Plastic Tube (CFPT) Embedded with Reinforcement Bar under Axial Compressive Load

“…Concrete-filled plastic tube (CFPT) is a composite column with a concrete core encased in a plastic tube, such as HDPE, PVC or UPVC tubes [1]. Figure 1 shows the cross-sectional of a typical CFPT design.…”

Energy Absorption Capacity of uPVC-Confined Concrete

“…One such material with good potential for structural concrete applications is the uPVC tube. With respect to its mechanical properties [2][3][4] and durability [5], the plastic tube displays good flexibility, toughness, and has excellent anti-corrosive characteristics [6][7][8]. The mechanical response of plain concrete to seismic excitation needs cyclic testing [9].…”