Experiments to establish the loadbearing behaviour of lightweight sandwich beams using textile‐reinforced and expanded polystyrene concrete

Nguyen, Viet Anh; Jesse, Frank; Curbach, Manfred

doi:10.1002/suco.201500156

Cited by 8 publications

(6 citation statements)

References 13 publications

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“…Sandwich structures are investigated not only for elements made of traditional materials but also for modern alternatives. For example, textile‐RC is a combination of small‐grain, high‐performance concrete and high‐strength textile reinforcement . This material was used for the face layers and was combined with a core of lightweight expanded polystyrene concrete to create lightweight sandwich beams.…”

Section: Introductionmentioning

confidence: 99%

“…For example, textile-RC is a combination of small-grain, high-performance concrete and high-strength textile reinforcement. 3 This material was used for the face layers and was combined with a core of lightweight expanded polystyrene concrete to create lightweight sandwich beams. Testing of the load-bearing behavior of such beams under three-and four-point bending was carried out to study their failure behavior.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of continuous two-layer reinforced concrete beams

Iskhakov

Ribakov

Holschemacher

2017

Structural Concrete

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Funding informationAlexander von Humboldt Foundation.Models and full-scale statically determinate two-layer beams (TLBs) made of steel-fiber high-strength concrete (SFHSC) in the compression zone and normalstrength concrete (NSC) in the tensile zone have been tested by the authors. The present study is a further stage of these investigations, focused on testing a continuous, two-span TLB with optimal steel/fiber ratio as in the previous stages. This is the first experimental investigation of continuous TLBs (CTLBs). The study is aimed at testing the CTLB behavior under positive and negative bending moments in the span and above the middle support. An additional issue that is studied in the course of this work is the influence of bending moment redistribution on the behavior of a CTLB. As in the previous research stages, interaction of the concrete layers in a CTLB was studied to demonstrate the efficiency of such beams for real structures. No cracks between the SFHSC and NSC layers were observed up to the ultimate limit state of the tested beam, which demonstrates proper interaction between the layers. The results obtained in the present study enable the recommendation of CTLBs for practical application as effective and economical continuous bending elements. K E Y W O R D Scontinuous two-layer beams, interaction between concrete layers, steel-fiber high-strength concrete | INTRODUCTIONAs is known, the main drawback of simply supported reinforced concrete (RC) beams is the relatively large moments in the span, which leads to large deflections and extensive cracking. Moreover, in simple statically determinate RC structures there is no internal moment redistribution, so the section in which the moment is maximum determines the load-bearing capacity of the structure. A solution to this problem is the use of continuous (statically indeterminate) RC structures that allow reduction of the maximum moment and deflection. In continuous beams, the moments above the supports and those in the span are redistributed, permitting the use of typical longitudinal reinforcement.One of the first theoretical works on continuous RC beams was carried out by Gvozdev, 1 which was focused on the load-bearing capacity of such beams. According to this method, each of the beam bays is loaded and the corresponding load-bearing capacity for the loaded bay is found. An equation for the calculation of the external bending moment in a certain loaded bay was proposed. The problem was solved for a beam with constant section dimensions by maximizing the internal forces. In a more general form, the problem of maximization of the internal forces for continuous RC beams was recently solved theoretically. Two-layer high-performance RC beams can be used in the traffic (longitudinal) direction of long-span bridges. The beam section consists of two parts: a bottom part made of normal-strength concrete (NSC), and an upper one made of steel-fiber-reinforced high-strength concrete (HSC). Using two-layer beams (TLBs) is logical because, as the beam span beco...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental investigation of continuous two-layer reinforced concrete beams

Iskhakov

Ribakov

Holschemacher

2017

Structural Concrete

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“…The structural requirement of the fill is only to transfer vertical loads to the shell, and therefore a low-density foamed concrete is proposed to minimise material use. Foamed concrete also provides good thermal and acoustic insulation [18], and has been used successfully in sandwich panel floors [19] and beams [20] in combination with normal weight concrete.…”

Section: Structural Conceptmentioning

confidence: 99%

Design, Construction and Testing of a Low Carbon Thin-Shell Concrete Flooring System

et al. 2019

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Rapid global urbanisation and population growth is driving unprecedented levels of building construction, with the total worldwide floor area expected to almost double over the next 40 years. Since most of the structural material in a building exists within the floors, these present a significant opportunity for structural engineers to contribute to a more sustainable construction industry. This paper examines a novel flooring system of textile-reinforced concrete shells with a foamed concrete fill, which has the potential to halve the amount of materials in a building's entire structure. A new design and geometry optimisation method is described, as well as the construction and testing of two prototypes; each 18mm thick, 2m in span and 200mm tall.These textile-reinforced concrete shells are unconventional in their low total depth, low reinforcement content and lack of rigid supports. Both were reinforced with AR-glass fibre textile and constructed using fine-grained concrete, however only one featured a foamed concrete fill. Each was tested to destruction under an asymmetric load. In both cases, a hinged collapse mechanism was formed rather than sudden catastrophic failure, with positive implications for safety and robustness.A non-linear finite element model was developed which replicated the observed behaviour well, including cracking patterns. Inaccuracies in geometry arising from the hand-made construction methods were measured and their structural impact was assessed and found to be small.The investigations confirm the strength, robustness and buildability of the structural system, and establish a reliable analysis method.

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“…The first set of samples was so designed to make it possible to evaluate the effect of low volumes of EPS beads on the slump and uniaxial compressive strength of concrete, yet, samples containing higher EPS contents were also prepared for the sake of comprehensiveness. Accordingly, the four W/C ratios of 45, 50, 55, 60% and the 15 EPS volume contents of 0, 1, 2, 3, 4, 5, 6,7,8,9,10,15,20,30, and 40% were chosen. The EPS concrete mixes of this set of samples were prepared by the partial replacement of coarse aggregates with EPS beads.…”

Section: Specimen Preparation and Testingmentioning

confidence: 99%

“…Ultra-lightweight closed-cell EPS beads can be effectively employed to produce concretes with promising strength to weight ratio, attractive sound, and heat insulation characteristics, and exemplary crushing and energy absorbing capacities. [1][2][3][4][5][6][7][8][9][10][11] Accordingly, mush research have been conducted in the past two decades to characterize the mechanical properties of EPS concrete from which a big portion is related to its compressive strength. 7,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] A closer look to this part of literature reveals that only the compressive strength of samples containing considerable volume contents of EPS beads (more than 10%) are addressed with a common finding stating that compressive strength is an ever decreasing function of EPS volume content.…”

Section: Introductionmentioning

confidence: 99%

Experimental and microstructural study of the compressive strength of concrete samples containing low volumes of expanded polystyrene beads

Bakhshi

Shahbeyk

2019

Structural Concrete

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The partial replacement of aggregates with expanded polystyrene (EPS) beads is a common technique to produce lightweight concretes. Much research have been already conducted on the compressive strength of EPS concretes containing high volumes of EPS beads. In the current study, however, specimens with low EPS volume contents are also examined. The results show that all the strength versus EPS volume content graphs initiate with a nearly plateau region. The length of this plateau region is found to be an increasing function of W/C ratio. It is also observed that the replacement of redundant water with the EPS beads initially improves strength but the trend is reversed beyond a critical volume content. Finally, the new empirical findings are interpreted and justified based on the underlying microstructural failure mechanisms. The results of this study can lay fresh grounds for the development of more realistic micromechanical and numerical models for EPS concrete.

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Experiments to establish the loadbearing behaviour of lightweight sandwich beams using textile‐reinforced and expanded polystyrene concrete

Cited by 8 publications

References 13 publications

Experimental investigation of continuous two-layer reinforced concrete beams

Experimental investigation of continuous two-layer reinforced concrete beams

Design, Construction and Testing of a Low Carbon Thin-Shell Concrete Flooring System

Experimental and microstructural study of the compressive strength of concrete samples containing low volumes of expanded polystyrene beads

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