Mechanical behavior and constitutive relationship of the three types of recycled coarse aggregate concrete based on standard classification

Deng, Zigang; Liu, Bing; Ye, Bailong; Xiang, Ping

doi:10.1007/s10163-019-00922-5

Cited by 38 publications

(6 citation statements)

References 68 publications

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“…Compared with the test results in [23][24][25], the results and the variation trend in the current study are consistent, as shown in Figures 9 and 10. Figures 9 and 10 show that compared with that of normal concrete, the cracking load of the recycled concrete decreases with increasing ITZ thickness, especially when the thickness of the ITZ is more than 2 mm.…”

Section: Numerical Simulation Results Of the Recycled Concretesupporting

confidence: 87%

Influence of the ITZ Thickness on the Damage Performance of Recycled Concrete

Tian

2021

Advances in Materials Science and Engineering

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The interfacial transition zone (ITZ) is a weak region of recycled concrete. To further study the influence of the ITZ on the damage performance of recycled concrete, a formula for calculating the ITZ thickness is derived, and the ITZ thickness is calculated for various recycled concrete mixtures with a recycled aggregate content of 30%. The concrete model test method and finite element analysis software were used to numerically simulate common concrete and recycled concrete with ITZ thicknesses of 0.05 mm, 1 mm, 2 mm, 3 mm, and 4 mm. The results show that the thickness of the ITZ has an obvious influence on the cracking strength of recycled concrete and that the cracking strength of recycled concrete decreases with increasing ITZ thickness. The cracks in recycled concrete initiate from the ITZ, and the damage degree increases with increasing ITZ thickness. Compared with that of common concrete, the cracking strength of recycled concrete with an ITZ thickness of no more than 2 mm (i.e., the replacement rate of the recycled aggregates is no more than 30%) is not significantly reduced.

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Section: Numerical Simulation Results Of the Recycled Concretesupporting

confidence: 87%

Influence of the ITZ Thickness on the Damage Performance of Recycled Concrete

Tian

2021

Advances in Materials Science and Engineering

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“…Te stress-strain curve can efectively refect the damage change trend of concrete material under external load [45]. Te full stress-strain curve of LAC is shown in Figure 5.…”

Section: Stress-strain Relationshipmentioning

confidence: 99%

Static and Dynamic Compression Performances of Hybrid Fiber‐Reinforced Lightweight Aggregate Concrete

Zhou¹,

Chen²

2022

Advances in Civil Engineering

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In this study, basalt fiber and polypropylene fiber with different volume ratios were mixed into lightweight aggregate concrete (LAC), and the static compressive strength and dynamic compressive performance of LAC mixed with fiber were tested. The influence of basalt fiber and polypropylene fiber on the stress-strain relationship and energy conversion relationship of LAC was analyzed. The results show that basalt fiber and polypropylene fiber with an appropriate volume ratio are beneficial to enhance the strength and toughness of LAC, but the mixing effect is better. When the volume ratio of mixed fibers is 0.2%, the compressive strength, elastic modulus, peak strain, and ultimate strain are increased by 61.9%, 23.57%, 32.81%, and 45.14%, respectively, compared with the LAC without fibers. Based on the statistical damage theory, the compressive damage constitutive model of fiber LAC is established; fiber improves the ductility and energy absorption capacity of LAC and shows better impact resistance. Finally, based on modern SEM microscopic testing technology and EDS testing technology, the internal structure and chemical element composition of ordinary LAC and fiber lightweight aggregate were compared and analyzed. The internal compactness of the aggregate concrete improves the strength and toughness of the lightweight aggregate concrete, which reveals the mechanism of the fiber on the LAC from a microscopic point of view.

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“…e steel pipe pile's elastic modulus is 206 × 10 9 kPa. In this numerical simulation, we utilize the elastic model to analyze the stressstrain relationship of the concrete structure [31][32][33] and the underpinning pile.…”

Section: Model Parametermentioning

confidence: 99%

Case Study and Numerical Simulation of Excavation beneath Existing Buildings

Shan

et al. 2020

Advances in Civil Engineering

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Excavation beneath existing buildings may cause the superstructure to tilt and crack, which seriously affects the normal use of the superstructure. Due to the new working conditions of excavation beneath existing buildings, related case reports are rare and limited. In the case of No. 3 section basement construction project of Ganshuixiang, we monitored the excavation construction by burying test instruments at the designated location. Afterwards, Plaxis 3D finite element software was used to establish an underpinning pile-cap-excavation model, which can analyze the influence of different pile cutting sequences on the bearing behavior of new basement structural pillars. By comparing the in situ measurement data with the finite element model, it can be concluded that when the excavation depth rises, the axial force of the underpinning pile gradually increases, and the pile skin friction is slowly exerted from top to bottom. Different cutting sequences will influence the bearing behavior of the structural pillar. Moreover, the pile cutting process also significantly impacts its bearing behavior and the settlement behavior of the superstructure. Compared with the clockwise pile cutting sequence, the symmetrical pile cutting is more advantageous. In the whole process of the storey adding and reconstruction, the superstructure settlement is related to the working condition of digging and adding layers. In the stage from soil excavation to the concrete curing period of the structural pillar, it increases slowly with time and tends to be stable in the concrete curing period. However, in the pile cutting stage, the superstructure settlement increases sharply, and after pile cutting, it becomes stable.

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Mechanical behavior and constitutive relationship of the three types of recycled coarse aggregate concrete based on standard classification

Cited by 38 publications

References 68 publications

Influence of the ITZ Thickness on the Damage Performance of Recycled Concrete

Influence of the ITZ Thickness on the Damage Performance of Recycled Concrete

Static and Dynamic Compression Performances of Hybrid Fiber‐Reinforced Lightweight Aggregate Concrete

Case Study and Numerical Simulation of Excavation beneath Existing Buildings

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