Assessment of Key Parameters Affecting Compressive Behavior of uPVC-Confined Concrete

Experimental work was conducted to evaluate the strength capacity of uPVC filled-concrete (CFPT) stub columns under different environmental conditions. The effect of three curing conditions, open-air, water, and sealed, on the CFPT specimens was examined. The water absorption of CFPT was also determined to evaluate the confining device's performance in protecting concrete in humid environments. Test results show that the plastic tube effectively reduced the water absorption of the confined concrete by more than 80%. In order to assess the influence of key parameters on the performance of CFPT under the applied load, a database was established that covered 186 axial compression test results of CFPT specimens. A detailed discussion of the key parameters affecting the overall behavior of CFPT also presented

PVC Plastic Tube with Concrete Infill Strengthened with FRP: A State-of-the-art Review

The strength and energy absorption capacity of concrete compression members are a significant concern when considering the structural performance under axial and lateral loads. A lot of methods and different techniques have been proposed in the past to improve the behavior of concrete columns under the applied loads. One such technique is the concrete filled-plastic tube (CFPT) strengthened externally with fiber-reinforced polymers (FRP). Such a system can improve the durability of the structural members. A review of the research work on the durability of the new system under axial and flexural loads is presented. Moreover, a comparison and a brief discussion of the reported results are displayed. &nbsp

Concrete Encased with Engineering Plastics

 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