Reduction of the Carbon Footprint of Precast Columns by Combining Normal and Light Aggregate Concrete

Halding, Philip Skov

doi:10.3390/buildings12020215

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…Green construction has become a focus in recent years [1,2]. Technological innovation [3,4] and novel materials [5,6] for green construction were developed to reduce the carbon footprint and lower costs from the building industry. Accelerated bridge construction (ABC) is assuming an increasingly pivotal role in urban bridge construction worldwide due to its high quality, rapid construction, minimum interference in traffic, and ability to reduce environmental pollution [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Bond–Slip Relationship between Rebar and Ultra-High-Performance Concrete Grouted in Bellows

Wang,

Zheng,

Wang

et al. 2023

Buildings

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Ultra-high-performance concrete (UHPC)-filled duct connection is an innovative solution for joining assembled structures, in which the anchorage performance of the rebar and UHPC filled in bellows plays a critical role in determining the overall connection effectiveness. To establish a reliable anchorage length and a bond–slip relationship between rebar and UHPC within a bellow, a total of 16 specimens were conducted, and pullout tests were carried out. Two parameters were considered, including the diameter ratio (D/d), representing the proportion of the diameter of the bellow D to the diameter of the steel bar d, and anchorage length (L). By analyzing the failure modes, load versus deflection curves, and steel strain data, the influences of the diameter ratio and anchorage length on the anchorage performance were discussed. The test results showed that the failure mode changed from rebar pullout to rebar breakage as the anchorage length increased from 3 d to over 10 d. The reliable anchorage length of the rebar was recommended to be at least 10 d with a diameter ratio (D/d) of 2.4. Moreover, a fitting bond–slip model was proposed based on the experimental bond–slip curves between the rebar and UHPC interface within the bellows with high precision. These findings constitute a crucial basis for the comprehensive stress analysis of assembled structures connected using UHPC grouted in bellows.

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Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Bond–Slip Relationship between Rebar and Ultra-High-Performance Concrete Grouted in Bellows

Wang,

Zheng,

Wang

et al. 2023

Buildings

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“…Therefore, these criteria of the CFST columns have resulted in using smaller columns in seismic areas but with appropriate capability and durability [4,5]. In addition, CFST columns, due to using specifically high-strength concrete inside them, have presented better fire resistance than the sole steel columns; the infilled concrete plays a remarkable role in the structural behaviour of CFST columns [6,7]. The recent improvements in concrete technology have led to generating high-performance concrete materials with superior characteristics compared with the normal concrete (NC), such as improved ductility, higher strength, and self-consolidating features.…”

Section: Introductionmentioning

confidence: 99%

Iterative Finite Element Analysis of Concrete-Filled Steel Tube Columns Subjected to Axial Compression

et al. 2022

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Since laboratory tests are usually costly, simulating methods using computers are always under the spotlight. This study performed a finite element analysis (FEA) using iterative solutions for simulating circular and square concrete-filled steel tube (CFST) columns infilled with high-strength concrete and reinforced with a cross-shaped plate (comprising two plates along the columns that divide the hollow columns into four equal sections) with and without opening. For this reason and for validation purposes, the columns had length of 900 mm, width/diameter of 150 mm and wall thickness of 3 mm. In this study, unlike in some other studies, the cross-shaped plate was assumed to be fixed at the top and the bottom of a column, and the columns were subjected to axial compression pointed in the center. The outcomes revealed that the cross-shaped plate could improve the axial strength of both circular and square CFST columns; however, the structural performance of the square CFST columns changed: local outward buckling was observed after inserting the cross-shaped plate. By inserting an opening on the cross-shaped plate, the bearing capacity of the circular CFST columns was further improved, while the square CFST columns experienced a decline in their ultimate bearing capacity compared with the corresponding models without the opening. The lateral deflection also improved for the circular CFST columns by adding the reinforcement. However, for the square CFST columns, while it initially improved, increasing the thickness of the cross-shaped plate inversely influenced the lateral deflection of the square CFST columns. The results were also compared with some available codes, and a good agreement was achieved with those outcomes.

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“…Green, intelligent, and information-based construction is the research frontier all over the world currently. As a kind of green structure, precast concrete structures, with the advantages of low carbon emissions and efficient construction, have been widely used in construction systems, which is and will be the world's mainstream future construction industrialization [1][2][3][4][5][6]. The core technology of precast concrete structures is the connection between individual components, and after that, the high-quality joints enable effective force transfer to provide bearing capacity and ductility [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Methodology for Prefabricated Shear Walls Considering Stochastic Defects in Grouting Materials

et al. 2022

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The most used connection form for reinforced steel bars is the grouting sleeve using cement-based grouting materials. Hence, the quality of the grouting sleeve connection determines whether the performance of a precast concrete structure is equivalent to that of a cast in situ concrete structure. However, several existing reasons, namely, insufficient grouting cement or poor construction controls and even stochastic bubble holes, lead to inevitable grouting defects. The behavior of precast concrete structures is affected dramatically. Considering the cost and efficiency of the analysis of precast concrete structures, the finite element method is still the most used method, but the simulation technology of structures considering stochastic defects in grouting materials is not sufficient. Herein, a simulation method considering stochastic defects in precast concrete structures is proposed, and the application of the method to grouting sleeves and shear wall structures is performed to verify its accuracy and feasibility. The construction of stochastic defects in grouting material is first realized through the Python scripter. Secondly, the mechanical parameters are obtained from the refined finite element analysis of grouting sleeves with material defects. Finally, based on the obtained mechanical properties of grouting sleeves, the behaviors of precast shear walls under blast loading are analyzed. The simulations of grouting sleeves under uniaxial tensile loading and precast concrete shear walls under blast loading both indicate that the proposed numerical method is feasible in solving the structural issues with stochastic defects in grouting materials.

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Reduction of the Carbon Footprint of Precast Columns by Combining Normal and Light Aggregate Concrete

Cited by 5 publications

References 28 publications

An Experimental Study on the Bond–Slip Relationship between Rebar and Ultra-High-Performance Concrete Grouted in Bellows

An Experimental Study on the Bond–Slip Relationship between Rebar and Ultra-High-Performance Concrete Grouted in Bellows

Iterative Finite Element Analysis of Concrete-Filled Steel Tube Columns Subjected to Axial Compression

Numerical Simulation Methodology for Prefabricated Shear Walls Considering Stochastic Defects in Grouting Materials

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