Structural response of composite concrete filled plastic tubes in compression

Oyawa, Walter O.; Gathimba, Naftary; Mang’uriu, Geoffrey

doi:10.12989/scs.2016.21.3.589

Cited by 26 publications

(33 citation statements)

References 14 publications

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“…However, knowledge on the use of plastic tubes in construction is scattered and lacks information regarding how to design a concrete confined in a plastic tube [1,2].Un-plasticized polyvinyl chloride (uPVC) is a family of polymers that is made from a chain of a long hydrocarbon and it is the most commonly used polymer families for plumbing purposes. When compared to polyvinyl chloride (PVC), uPVC is strong, stiff, hard, and does not burn by itself [2][3][4][5][6][7][8]. uPVC is resistant to corrosion, abrasion, acids, salts, and bases, which provides the advantage of its use as a structural material in any such environment [1,2].…”

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“…However, the use of uPVC pipes as a concrete confining material is at its very beginning and the amount of information on how to design and use it in construction is very limited. It has been established that providing a uPVC lateral confinement can enhance the strength and ductility of concrete [4][5][6]9,[17][18][19]. Gupta and Verma [8] investigated the durability through submerging the PVC confined RC column for six months into a salt concentration, which is more than 20 times more so than natural seawater.…”

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confidence: 99%

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Structural Performance of uPVC Confined Concrete Equivalent Cylinders Under Axial Compression Loads

2019

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There is always a need for more durable, ductile, and robust materials for buildings, bridges, and other infrastructure due to the drawbacks of existing construction materials. Some of the drawbacks are the corrosion of steel, the brittle failure of concrete, and the performance instabilities that are caused when exposed to different environments. Thus, an innovative system is required to improve the performance and retain the integrity of structures in a harsh environment. To alleviate the situation, Un-plasticized polyvinyl chloride (uPVC) tubes are used as a confining material and their performance was experimentally evaluated by testing uPVC confined equivalent cylinders. Accordingly, unconfined and uPVC confined equivalent concrete cylinders for five different concrete classes, four types of uPVC tube sizes, and the aspect ratios of two (h/D = 2) were prepared and tested under axial compression loads. The result shows that the uPVC confinement increased the strength, ductility factor, and energy absorption in between 1.28–2.35, 1.84–15.3, and 11–243 times the unconfined levels, respectively. The confinement performed well for lower concrete classes and higher thickness to diameter ratios (2t/D). The post-peak behavior of the stress-strain curve was affected by the 2t/D ratio and the absolute value of the slope decreased as the 2t/D ratio increased. Additionally, the uPVC tube has shown several advantages, such as acting as a permanent formwork, protecting the concrete from chemical attacks, preventing the segregation of concrete, preventing peeling, and taking off concrete cover, decreasing the cross-section, and resulting in lighter sections. The uPVC confinement provided a remarkable improvement on the strength, ductility, energy absorption, and post-peak behavior of concrete. Therefore, uPVC tubes can be used as confining material for bridge piers, piles, electric poles, and highway signboards, where the fire risk is very small, though additional research is required on fire resistance mechanisms, such as wire-mesh reinforced mortar cover.

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Structural Performance of uPVC Confined Concrete Equivalent Cylinders Under Axial Compression Loads

2019

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“…Concrete‐filled double steel tubular (CFDST) column, which consists of two concentric steel tubes and the filled concrete, is a new member in the whole concrete‐filled steel tube (CFST) family . Similar to the composite columns that combine the advantages of steel and concrete, CFDST columns have been actively researched and widely implemented. CFDST column can effectively reduce the cross‐section area and significantly improve mechanical performance.…”

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Beam‐column connections of concrete‐filled double steel tubular frame structures

Zhang

Zhou

2019

Structural Design Tall Build

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Four types of concrete-filled double steel tubular (CFDST) columns were introduced in this paper, which had the advantage of higher bearing capacity, stronger stiffness, and better fire-resistant and explosion-resistant performance. To research a reasonable form of beam-column connection is the top priority in CFDST frame structures. After a brief historical background concerning the development of CFDST columns, this study conducted an investigation and comparison of several existing beam-column connections. The constructional detail and force transfer mechanism of each beam-column connection were analyzed according to the present research achievements. Several finite element models were established to discuss the various connection configurations and main factors affecting their behaviors. In general, connection design can take full advantage of the characteristic of double tubes in CFDST structure, so a series of construction improvements for joint design parameters in CFDST frame structures was proposed to improve the seismic performance and the relevant study for the future work was also discussed.

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“…Majority of the failure occurred during construction. This collapse has been attributed to among other possible causes, the quality of in-situ concrete and poor workmanship [2] [8] [11].…”

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confidence: 99%

Influence of Constituent Materials Properties on the Compressive Strength of in Situ Concrete in Kenya

Okumu¹,

Shitote²,

Oyawa³

2017

OJCE

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The poor quality of Kenyan in situ concrete has necessitated research to establish the properties of the ingredient materials and their influence on the troubling rate of failure of reinforced concrete structures in the country during construction and usage. The compressive strength of concrete relies on the properties of the constituent materials, proportions of the mixture, workmanship, compaction method and curing conditions. This paper outlines findings of an experimental investigation on the properties of Kenyan concrete ingredient materials and their influence on the compressive strength of concrete in Kenya. Three types of cements (42.5N, 32.5R, 32.5N) from six different cement manufacturers and fine aggregates from three different regions in the country were used during the study. Cements and aggregates chemical analysis was done using the Atomic Absorption Spectrometer machine while the physical and the mechanical properties were checked based on the British Standards. The British DOE concrete mix design method was used to generate the concrete mix proportion and concrete was tested for early and ultimate compressive strengths at 7, 14 and 28 days. It was observed that the different cement brands have varying properties with CEM A having the highest ultimate compressive and flexural strengths. It was further noted that aggregates from the coastal region produced concrete of higher compressive strengths. When the commonly used mix design method was adopted, blended Portland cements produced concrete with ultimate compressive strengths lower than the designed target strengths. The study therefore recommends the development of a concrete mix design procedure for blended cement concrete production in Kenya.How to cite this paper:

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Structural response of composite concrete filled plastic tubes in compression

Cited by 26 publications

References 14 publications

Structural Performance of uPVC Confined Concrete Equivalent Cylinders Under Axial Compression Loads

Structural Performance of uPVC Confined Concrete Equivalent Cylinders Under Axial Compression Loads

Beam‐column connections of concrete‐filled double steel tubular frame structures

Influence of Constituent Materials Properties on the Compressive Strength of in Situ Concrete in Kenya

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