A closed-form fracture model to predict tensile strength and fracture toughness of alkali-activated slag and fly ash blended concrete made by sea sand and recycled coarse aggregate

Yang, Shutong; Li, Linzhen; Sun, Zhongke; Wang, Junhao; Guo, Qian‐Hui; Yang, Yushan

doi:10.1016/j.conbuildmat.2021.123976

Cited by 23 publications

(5 citation statements)

References 55 publications

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“…14 fracture model to predict the tensile strength and fracture toughness of concrete. 15 However, sparse research uses experimental and Digital image correlation (DIC) methods to obtain the fracture toughness. DIC technology, as a noncontact, nondestructive testing technology, can evaluate crack morphology and crack opening displacement by analyzing full-field displacement and strain images.…”

Section: Introductionmentioning

confidence: 99%

“…The maximum loads of notched three-point-bend specimens with constant height are used to determine the tensile strength and fracture toughness of concrete In addition, scholars have proposed an analytical fracture model to predict the tensile strength and fracture toughness of concrete . However, sparse research uses experimental and Digital image correlation (DIC) methods to obtain the fracture toughness.…”

Section: Introductionmentioning

confidence: 99%

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Investigating the Effect of Water Saturation on Rock Fracture Characteristics: Some Insights from Digital Image Correlation Technology

Wang,

Deng,

Zhang

et al. 2024

Energy Fuels

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To investigate the fracture characteristics of rocks during the hydraulic fracturing process, Brazilian splitting experiments were conducted on cores with varying water saturations. Digital image correlation (DIC) technology was employed to capture full-field displacement and strain information during the rock fracture, facilitating the calculation of the rock fracture toughness using the path-independent J-integral. Additionally, displacement opening modes and fracture surface morphologies were obtained for rocks with different water saturations. The results show that the rock tensile strength decreases significantly as the water saturation increases. Under higher water saturations, the rock residual strength increases, showing a more obvious ductile failure mode. The fracture surfaces are found to display self-affine regimes, with a Hurst exponent β ≈ 0.62 in saturated conditions and with β ≈ 0.17 in dry conditions. Furthermore, as the integrated area of the crack tip increases, the fracture toughness gradually increases and stabilizes. The observed significant change in fracture toughness under high water saturation may be attributed to the increased plastic zone around the rock crack tip.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigating the Effect of Water Saturation on Rock Fracture Characteristics: Some Insights from Digital Image Correlation Technology

Wang,

Deng,

Zhang

et al. 2024

Energy Fuels

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“…The compressive behavior of the cylinder under uniaxial compressive tests was studied. As is well known, the stress-strain relationship of the structural member was essential for compressive behavior [27][28][29][30]. For instance, Chang et al [31] investigated the effect of the recycled aggregate (RA) replacement ratio on the stressstrain behavior of different concrete strengths.…”

Section: Introductionmentioning

confidence: 99%

Compressive Performance of Fiber Reinforced Recycled Aggregate Concrete by Basalt Fiber Reinforced Polymer-Polyvinyl Chloride Composite Jackets

Zhai¹,

Liu²,

Liu³

et al. 2023

Journal of Renewable Materials

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The development of recycled aggregate concrete (RAC) provides a new approach to limiting the waste of natural resources. In the present study, the mechanical properties and deformability of RACs were improved by adding basalt fibers (BFs) and using external restraints, such as a fiber-reinforced polymer (FRP) jacket or a PVC pipe. Samples were tested under axial compression. The results showed that RAC (50% replacement of aggregate) containing 0.2% BFs had the best mechanical properties. Using either BFs or PVC reinforcement had a slight effect on the loadbearing capacity and mode of failure. With different levels of BFs, the compressive strengths of the specimens reinforced with 1-layer and 3-layer basalt fiber reinforced polymer (BFRP) increased by 6.7%-10.5% and 16.5%-23.7%, respectively, and the ultimate strains increased by 48.5%-80.7% and 97.1%-141.1%, respectively. The peak stress of the 3-layer BFRP-PVC increased by 42.2%, and the ultimate strain improved by 131.3%, relative to the control. This reinforcement combined the high tensile strength of BFRP, which improved the post-peak behavior, and PVC, which enhanced the structural durability. In addition, to investigate the influence of the various constraints on compressive behavior, the stress-strain response was analyzed. Based on the analysis of experimental results, a peak stress-strain model and an amended ultimate stress-strain model were proposed. The models were verified as well; the result showed that the predictions from calculations are generally consistent with the experimental data (error within 10%). The results of this study provide a theoretical basis and reference for future applications of fiber-reinforced recycled concrete. KEYWORDSBasalt fiber reinforced polymer; polyvinyl chloride; recycled aggregate concrete; axial compression performance; stress-strain relationships; stress-strain model Nomenclature f 0 l Lateral confining pressure of actively confined concrete (MPa) f lp Lateral confining pressure of PVC confined concrete (MPa) f lf Lateral confining pressure of BFRP confined concrete (MPa) E pvc Elastic modulus of PVC (MPa) e pvc Mono-axial tensile strain of PVC t pvc Thickness of PVC material (mm) E frp Elastic modulus of FRP (GPa)

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“…The carbonation depth of RAC decreased after the addition of seawater and sea sand. In addition, related studies were conducted on the fracture toughness of sea sand recycled concrete (Yang et al, 2021) and the dynamic bonding performance of sea sand recycled concrete with basalt fiber reinforced polymer (BFRP) bars at a high strain rate (Xiong et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Bearing capacity of seawater sea sand recycled aggregate concrete beams reinforced with glass fiber reinforced polymer bars

Zhang

Xiao

Xiao-long

et al. 2023

Advances in Structural Engineering

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In this study, seawater, sea sand and recycled coarse aggregate (RCA) are combined to prepare seawater sea sand recycled aggregate concrete (SSRAC) for use in beams. Nine beams are reinforced with glass fiber reinforced polymer (GFRP) bars, while 2 more beams are reinforced with steel bars for comparison. Unlike reinforced concrete (RC) beams that contain steel bars, SSRAC beams reinforced with GFRP bars (GFRP-SSRAC) are less stiff and ductile. For GFRP-SSRAC beams with a certain shell particle content in this study, the use of seawater and sea sand in concrete decreases the cracking load. The ultimate load is smaller overall for GFRP-SSRAC beams than RC beams with the same reinforcement ratio. The predictions of flexural capacities made using the ACI code are all lower than the test results. When the replacement ratio of RCA is 100%, the predictions for RAC/SSRAC beams using the Chinese code are lower than the measured values. Finally, the measured stress‒strain curves of SSRAC and GFRP bars are used to obtain the moment-curvature relationships according to reinforcement-based and concrete-based calculation methods. These calculations and results are discussed in this paper.

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A closed-form fracture model to predict tensile strength and fracture toughness of alkali-activated slag and fly ash blended concrete made by sea sand and recycled coarse aggregate

Cited by 23 publications

References 55 publications

Investigating the Effect of Water Saturation on Rock Fracture Characteristics: Some Insights from Digital Image Correlation Technology

Investigating the Effect of Water Saturation on Rock Fracture Characteristics: Some Insights from Digital Image Correlation Technology

Compressive Performance of Fiber Reinforced Recycled Aggregate Concrete by Basalt Fiber Reinforced Polymer-Polyvinyl Chloride Composite Jackets

Bearing capacity of seawater sea sand recycled aggregate concrete beams reinforced with glass fiber reinforced polymer bars

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