Mechanical properties of concrete composites with auxetic single and layered honeycomb structures

Zhong, Rui; Ren, Xin; Zhang, Xiang Yu; Luo, Chen; Zhang, Yi; Xie, Yi Min

doi:10.1016/j.conbuildmat.2022.126453

Cited by 84 publications

(13 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Research on reinforced concrete seeks to offer improvements to composite structure strength via improved roughness or chemical adherence, or by adding ribs [17][18][19] . Other studies are also being carried out on Metamaterial structures for sandwich panels 20 , or by modifying the concrete matrix 21 . Some research in reinforced concrete 13,14,22 has studied using rebars with Metamaterial surface designs to improve mechanical performance.…”

Section: Metamaterials In Reinforced Concretementioning

confidence: 99%

Interfacial Bonding Strength in Cement Mortar Beams Reinforced with Metamaterial Bars

et al. 2022

View full text Add to dashboard Cite

Reinforced concrete beam (RCB) elements show low mechanical performance when interfacial bonding strength (IBS) is not well controlled. New tailorable material-structure arrangements -Metamaterials -offer solutions to the IBS problem. This paper analyzes the mechanical characteristics of IBS on RCBs for reinforced cement mortar containing Metamaterial bars (MMB) that were machined from SAE 1020 Carbon steel. Each MMB has a stepped geometrical shape, with a cylindrical bar divided into equal-length segments, along with a 'rise height' (p) change. Four geometries were defined, i.e., R0− Smooth bar, R1− p = 0.1mm, R2− p =0.3mm and R3− p=0.5mm. Three-point flexural strength tests were performed on the RCBs to determine the maximum bond strength (ML) between the MMB and cement mortar. Images of interfacial regions were obtained using SEM and 3D Roughness Reconstruction software to calculate the average roughness (Ra) and the roughness height (Rz). The reinforcement MMB geometry had a significant impact on the ML results, particularly on the first crack strength and the failure mode. The R3 geometry ML values were higher than the other tested geometries (44.5%). The results of the scale models are encouraging and offer a novel and prospective direction for further experimental and even numerical Metamaterial research to improve interfacial bond strength.

show abstract

Section: Metamaterials In Reinforced Concretementioning

confidence: 99%

Interfacial Bonding Strength in Cement Mortar Beams Reinforced with Metamaterial Bars

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Recently, further advancement has been made by few researchers by filling cementitious mortar mix [38] or concrete [39,40], into metallic auxetic honeycomb structures, which were tested under compression for the confining effects on cementitious mortar/concrete provided by the auxetic lattices. The auxetic cellular tubes and honeycombed structures provided effective confinement to concrete under compression.…”

Section: Introductionmentioning

confidence: 99%

Flexural behaviour of cementitious composites embedded with 3D printed re-entrant chiral auxetic meshes

Zahra,

Asad,

Thamboo

2024

Smart Mater. Struct.

View full text Add to dashboard Cite

3D printed auxetic metamaterials can be used to make high performing cementitious composites to strengthen existing structures and elements due to their negative Poisson’s ratio behaviour and high energy absorbing characteristics. In this paper, three different re-entrant chiral auxetic (RCA) meshes of various cell geometries and orientations were developed by 3D printing them using poly-lactic acid (PLA) and thermoplastic polyurethane (TPU) filament. The developed meshes were tested under out-of-plane flexure to study their load carrying capacity, ductility and energy absorption characteristics, especially to characterise the best cell orientation. The horizontal cells provided enhanced load carrying and energy absorption characteristics for all three cell geometries for both materials. These RCA meshes were then embedded into low and high strength premix cement mortar matrices to develop Auxetic Cementitious Composites (ACC). In total, forty-two ACC specimens were casted and tested under flexural loading. The results were studied in terms of their failure patterns, load-displacement responses, flexural capacities, ductility and energy absorption. The RCA meshes made of PLA filament showed limited capacity and energy absorption as compared to RCA meshes made of TPU filament due to extended flexibility and resilience provided by TPU meshes. The RCA meshes with a denser cell structure exhibited highest flexural capacity and effective energy absorption of 14,700 kJ/m2 for TPU-RCA mesh embedded into high strength cement mortar matrix. The results obtained in this study have enabled to understand the flexural behaviour of cementitious composites embedded with 3D printed auxetic lattices and to strengthen the existing structures.

show abstract

“…On one hand, due to the characteristics of outward expansion under uniaxial tension and inward shrinkage under uniaxial compression, the concave hexagonal negative Poisson’s ratio honeycomb has a higher yield strength [ 37 ], stronger energy absorption capacity [ 38 ], larger shear modulus [ 39 ], better stress diffusion effect, higher fracture toughness [ 40 ], and tunable mechanical properties [ 41 ] compared with the traditional hexagonal honeycomb. Thus some negative Poisson’s ratio structures have been proposed and examined.…”

Section: Introductionmentioning

confidence: 99%

In-Plane Impact Response of Graded Foam Concrete-Filled Auxetic Honeycombs

Wang

Jia²,

Liu³

et al. 2023

Materials

View full text Add to dashboard Cite

Foam-filled honeycombs have been widely applied due to their excellent load transfer mitigation and energy absorption capacity. In the present study, a layered graded foam concrete-filled auxetic honeycomb was proposed by tuning its overall compression deformation mode to layer-by-layer deformation mode to realize multi-level structural protection. The effect of the honeycomb cell-wall thickness gradient (with an average thickness of 0.25 mm, thickness gradients of 0.30:0.25:0.20, 0.35:0.25:0.15 and 0.40:0.25:0.10, and corresponding positive gradients) and the foam concrete filler density gradient (408:575:848, 848:575:408) on the response mode, load transfer, energy absorption, and Poisson’s ratio of the proposed composite was systematically investigated. The results showed that the graded composite exhibited an obvious layered deformation mode and a negative Poisson’s ratio effect under relatively low and moderate loading rates (1 m/s, 10 m/s, respectively), especially with the foam concrete density gradient. Under a high loading rate (100 m/s), the graded composite demonstrated progressive collapse initiating from the loading end with a layer-by-layer crushing mode, regardless of the thickness and density gradient. In the response of the composite with a 0.2:0.2:0.2 thickness ratio and a 408:575:848 foam concrete gradient subjected to 1 m/s crushing, the first-layer, second-layer, and third-layer foam concrete absorbed 94.62%, 88.72%, and 86.94% of the total foam concrete energy absorption in the corresponding crushing stage, respectively. Compared with the counterpart homogeneous composites, although the graded composite had an insignificant improvement on energy absorption (less than 5%), it was able to significantly reduce the peak load (as high as 30%) to mitigate the load transfer to the protected structure. The effective Poisson’s ratio of the first layer in the composite with positive gradient (408:575:848) increased to −2 then converged to −0.6 under 2 m/s and 10 m/s crushing, and ranged from −0.4 to −0.1 under 50 m/s and 100 m/s crushing, respectively. The effective Poisson’s ratio of the middle and bottom layers increased to −2 initially and converged to range −0.4 to −0.1, regardless of the crushing speed. The staged response mode of the graded composite facilitated the realization of multi-level structure protection with significantly reduced peak load transferred to the protected structure and tuned energy absorption.

show abstract

Mechanical properties of concrete composites with auxetic single and layered honeycomb structures

Cited by 84 publications

References 54 publications

Interfacial Bonding Strength in Cement Mortar Beams Reinforced with Metamaterial Bars

Interfacial Bonding Strength in Cement Mortar Beams Reinforced with Metamaterial Bars

Flexural behaviour of cementitious composites embedded with 3D printed re-entrant chiral auxetic meshes

In-Plane Impact Response of Graded Foam Concrete-Filled Auxetic Honeycombs

Contact Info

Product

Resources

About