Mechanical characteristics and energy dissipation characteristics of dredged sand concrete during triaxial loading

Luan, Jinjin; Chen, Xudong; Ning, Yingjie; Zhang, Wei

doi:10.1016/j.jobe.2022.104700

Cited by 4 publications

(4 citation statements)

References 17 publications

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“…Therefore, there is an urgent need to find a more cost-effective way to deal with the increasing number of waste dredged sand. The utilization of dredged sand as building materials is a new method to consume dredged sand [16,17]. In this paper, 3D printing materials are prepared with dredged sand as the main raw material replacing natural sand.…”

Section: Introductionmentioning

confidence: 99%

Effect of nano clay and PCE on the buildability of ultra-fine dredged sand-based 3D printing materials

Wang

Hua

Chen³

et al. 2023

Mater. Res. Express

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The use of ultra-fine dredged sand instead of natural sand in construction 3D printing materials can significantly reduce the cost. However, ultra-fine dredged sand has fine particles and high angular morphology, which can hinder the buildability and continuous printability of construction 3D printing materials. The addition of polycarboxylate superplasticizer (PCE) can effectively solve this problem. Considering that the change of PCE (content of 0, 0.1%, 0.2%, 0.3%) content has a great influence on the printing performance of mortar, in order to make up for this deficiency, nano clay (content of 0,1%) is added to the mortar. The experimental results showed that the addition of nano clay can significantly reduce the negative effects of PCE on the yield stress and apparent viscosity of 3D printing materials (3DPM). When the content of PCE is 0.2%, the addition of 1% NAC could increase the static yield stress and viscosity growth rate of 3DPM by 111.8% and 115.3% respectively. In addition, unconfined compressive strength test, isothermal calorimetry, mercury invasion porosity method and thermogravimetric analysis were used to characterize the hardening properties of 3DPM. The results of heat of hydration showed that the addition of nano clay reduced the hydration exothermic peak of 3DPM, but increased the total heat release. The results of pore structure analysis showed that the addition of nano clay reduced the macropore (>1000 nm) of 3DPM from 19.31% to 18.82%. Thermogravimetric analysis showed that the addition of nano clay increased the hydration products. Therefore, the compressive strength of 3DPM was kept within an acceptable range. Finally, the laboratory's printing results indicated that the 3DPM can print up to 20 layers continuously.

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Section: Introductionmentioning

confidence: 99%

Effect of nano clay and PCE on the buildability of ultra-fine dredged sand-based 3D printing materials

Wang

Hua

Chen³

et al. 2023

Mater. Res. Express

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“…In practical engineering, concrete structures are often under multiaxial compression, such as dams, concrete structures with spiral stirrups or steel tubes. [23][24][25] Therefore, the triaxial compressive mechanical behaviors of recycled concrete have been extensively studied by many scholars. According to the test results, Xue et al 26 simulated an improved elastoplastic model in order to accurately predict the triaxial mechanical behavior of RAC.…”

Section: Introductionmentioning

confidence: 99%

“…In practical engineering, concrete structures are often under multiaxial compression, such as dams, concrete structures with spiral stirrups or steel tubes 23–25 . Therefore, the triaxial compressive mechanical behaviors of recycled concrete have been extensively studied by many scholars.…”

Section: Introductionmentioning

confidence: 99%

Microscopic mechanism analysis and failure criterion study of glass fiber recycled concrete under three‐dimensional compressive stress state

Chen,

Wang,

Liang

et al. 2023

Structural Concrete

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This study aims to address the complex stress state commonly observed in concrete structures in practical engineering, as well as the challenges posed by resource scarcity and environmental pollution. To achieve this, a total of 168 cylinder specimens of glass fiber recycled coarse aggregate concrete (GFRAC) were designed for conventional triaxial compression tests. The analysis of the test results reveals that the application of lateral restraint force induces a shift in the failure mode of GFRAC from longitudinal splitting failure to plastic deformation failure, occurring either in the middle or at the end of the specimen. The lateral constraint force can effectively improve the stress and strain at the peak point of GFRAC and the modulus of elasticity of the specimen. The glass fiber increases the peak stress of the specimen, and the maximum growth rate is 20%. On the contrary, the glass fiber reduces the peak strain, and the maximum reduction is 49.66%. Increasing the replacement rate of recycled coarse aggregate will lead to a decrease in peak stress, with a maximum decrease of 19.17%. Glass fiber (GF) limits the appearance and propagation of cracks by bridging, pulling out or breaking. Finally, three different failure criteria are used to analyze the triaxial compression state of GFRAC from a macro perspective.

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“…The ultra-fine drift sediment will be used to produce foamed concrete, and they will effect partial replacement of cement by slag, taking the ultra-fine drift sand of the Yangtze River waterway regulation as the raw material for insulation of buildings. The results of the tri-axial test of concrete showed that the residual stress of concrete under tri-axial monotonic loading was smaller than that under stable loading [10]. Fly ash and silica fume have been widely used for improved concrete durability and strength.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Foamed Concrete Containing Ultra-fine Drift Sand of the Yangtze River

Al-Sairafi

Jiang²,

Wang³

et al. 2022

Civ Eng J

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The primary goal of this study was to evaluate the use of Ultra-fine Drift Sand from the Yangtze River (China) in place of natural sand in the production of foamed concrete. The experimental design included factors with varying levels: the proportion of Ultra-fine Drift Sand at four levels (0 percent, 30%, 60%, and 100%). Ultra-fine Drift Sand was substituted in proportion to the mass of material. Each factor's effect on compressive strength, density (dry and saturated), air voids, and water absorption was assessed. According to the results, all factors had significant findings. The compressive strength of concrete increased due to an increase in curing time; fly ash content up to 30%; increasing the percent of Yangzi river sand; and decreasing slag. The mixture of 10% SF (Silica Fume), 24% FA (Fly Ash) and 100% YS (Yangzi soil) gives the enhanced results in concrete strength, by which it reaches about 7 MPa compared with other findings. The remaining percentages of mixing benefit compression strength results. This method of treatment provides an economical way through providing a cheap material that enhances the mechanical properties of concrete, provides a light weight concrete, and a good isolator material to improve the building's thermal insulation to reduce ecological problems and save energy. Doi: 10.28991/CEJ-2022-08-08-013 Full Text: PDF

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Mechanical characteristics and energy dissipation characteristics of dredged sand concrete during triaxial loading

Cited by 4 publications

References 17 publications

Effect of nano clay and PCE on the buildability of ultra-fine dredged sand-based 3D printing materials

Effect of nano clay and PCE on the buildability of ultra-fine dredged sand-based 3D printing materials

Microscopic mechanism analysis and failure criterion study of glass fiber recycled concrete under three‐dimensional compressive stress state

Characteristics of Foamed Concrete Containing Ultra-fine Drift Sand of the Yangtze River

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