Abstract
To reduce the global emission of CO2 from the building industry, researchers, architects and manufacturers must consider new ways of constructing precast concrete buildings. Modern concrete columns and walls are not optimized to the applied load, and there is potential to save material. By creating a stronger column core and a lightweight concrete cover, it is possible to reduce the carbon footprint. A method is proposed to calculate such eccentrically loaded columns of two or more materials. The analytical method is developed for straight columns and columns with Entasis. Production of curved Entasis columns is possible by using textile molds due to the low mold pressure from the light aggregate concrete. Two column types are load tested to confirm the method. The CO2 emission is calculated for some column examples, and it shows that an optimized column geometry often leads to a reduced carbon footprint compared to regular columns. The concept is especially efficient for slender columns. Furthermore, the external light aggregate concrete layer ensures protection against fire if high-strength concrete is applied as the column core.
Highlights
Modern concrete columns are often precast to reduce cost and achieve easier assembly at the construction site
The external light aggregate concrete layer ensures protection against fire if high-strength concrete is applied as the column core
Zhu et al [20] seem to be the only ones to have investigated how a concrete jacket of a stronger concrete could have the potential to confine an ordinary concrete core if papers concerning in situ strengthening of 2 of 18 existing concrete columns (e.g., [21]) are disregarded. Another method for improving the concrete column strength and stability is ultra-high-performance concrete (UHPC), see concrete and additional reinforcement were poured in the space between the flanges of the Figure 1C
Summary
Modern concrete columns are often precast to reduce cost and achieve easier assembly at the construction site. Hany et al [2] made FEM-based investigations to verify similar FRP confined column specimens, and others have tried to reduce the carbon footprint further by utilizing reused aggregates for the confined concrete [3,4]. Zhu et al [20] seem to be the only ones to have investigated how a concrete jacket of a stronger concrete could have the potential to confine an ordinary concrete core if papers concerning in situ strengthening of 2 of 18 existing concrete columns (e.g., [21]) are disregarded Another method for improving the concrete column strength and stability (which does not include concrete confinement) is ultra-high-performance concrete (UHPC), see concrete and additional reinforcement were poured in the space between the flanges of the Figure 1C. Figure fromthe theliterature literature improve strength stability of concrete columns
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