Fracture energy evolution of two concretes resistant to the action of freeze-thaw cycles

Enfedaque, Alejandro; Romero, H. L.; Gálvez, Jaime C.

doi:10.3989/mc.2014.00813

Cited by 13 publications

(8 citation statements)

References 18 publications

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“…• The core specimens exposed to 56 freeze-thaw cycles exhibited a significantly different compressive strength from that of the specimens subjected to 8 freeze-thaw cycles and the non-subjected ones [30].…”

Section: Freeze-thaw Testmentioning

confidence: 88%

Investigation of the Effect of Freeze-thaw Cycles on the Mechanical Properties of Hardened Self-compacting Concrete

Kap¹

2020

Preprint

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This study investigated the effects of freeze-thaw cycles on the mechanical properties of hardened self-compacting concrete for varying column heights. A column (100×20×300 cm) was fabricated by C30 self-compacting concrete in the laboratory and 10 cube samples (10x10x10 cm) were taken from fresh concrete as the references. After a period of 28 days, 160 core specimens (Ø67 mm in diameter) were taken from different column heights. Unit weight, water absorption, compressive strength, and freeze-thaw tests were performed on these 170 (10 reference cubic and 160 core) samples. The mechanical properties of the core specimens before freeze-thaw and after 8-56 freeze-thaw cycles were reported for varying column heights. The average compressive strength value of the reference cubic samples was determined as 40.28 MPa, while the compressive strengths of the core specimens before freeze-thaw were ranged from 40.25 MPa to 49.62 MPa, impying an increase in compressive strength values up to 23.18% compared to the reference cubic samples. Compressive strengths of the specimens subjected to 8 and 56 freeze-thaw cycles varied between 38.71‒48.07 MPa and 31.72‒39.11 MPa, respectively. Statistical analysis revealed that the compressive strength of the concrete exposed to 56 freeze-thaw cycles was significantly different from that of the other specimens.

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Section: Freeze-thaw Testmentioning

confidence: 88%

Investigation of the Effect of Freeze-thaw Cycles on the Mechanical Properties of Hardened Self-compacting Concrete

Kap¹

2020

Preprint

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“…The process carried out to assess the fracture energy of GRC was based on the recommendations for obtaining the fracture energy of concrete, which have been extensively used with successful results [15] [16]. When adapting the recommendation RILEM TC-187-SOC to GRC, the relation between the dimensions of the samples could not be maintained due to a reduced thickness.…”

Section: Test Setupmentioning

confidence: 99%

The Influence of Additions in the Use of Glass Fibre Reinforced Cement as a Construction Material

Enfedaque¹,

Alberti²,

Gálvez³

2016

MSA

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Although in recent years glass fibre reinforced cement (GRC) has been used in buildings and infrastructure, its application in structural elements has been somewhat restricted due to the worsening of its mechanical properties with ageing and the limited data available related with its fracture energy. With the aim of developing existing knowledge of GRC, the fracture energy in an in-plane and out-of-plane direction of the panel has been obtained. Three types of GRC with different formulations have been tested. The results showed that the fracture energy of a GRC with a 25% addition of a pozzolanic admixture is 40% and 8% higher than a standard GRC in, respectively, in-plane and out-of-plane directions. Similarly, an addition of 25% of thermal-treated kaolin to a standard GRC increases its fracture energy up to 490% and 400%, to the corresponding orientation. The use of digital image correlation (DIC) in the fracture test analysis has permitted a description of the damaging patterns and explanation of the behaviours identified in the fracture tests performed. The multi-cracking process that appears explains the higher fracture energy found in the GRC with an addition of 25% of the aforementioned thermal-treated kaolin. The analysis performed by means of DIC and the results obtained showed GRC with an addition of 25% of thermal-treated kaolin to be the most suitable formulation for possible future structural applications with a short life span in horizontal and vertical elements.

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“…Mechanical experiments show that the mechanical and fracture behavior of concrete under freeze-thaw cycles is different from that of undamaged concrete. The tensile strength and fracture energy of concrete both decrease as the increase of freeze-thaw cycles (Kosior-Kazberuk, 2013) and the area of fracture surface increases (Enfedaque et al., 2014). Repeated freeze-thaw cycles cause surface scaling and internal damage in concrete, and the latter is considered as the primary reason for degradation of fracture properties.…”

Section: Introductionmentioning

confidence: 99%

Microstructural damage evolution and its effect on fracture behavior of concrete subjected to freeze-thaw cycles

Dong

Qiao

et al. 2018

International Journal of Damage Mechanics

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Concrete structures in cold regions are exposed to cyclic freezing and thawing environment, leading to degraded mechanical and fracture properties of concrete due to microstructural damage. While the X-ray micro-/nano-computed tomography technology has been implemented to directly observe concrete microstructure and characterize local damage in recent years, the freeze-thawed damage evolution processes and its effect on overall mechanical performance are not well understood. In this paper, the X-ray nanocomputed tomography technology and micro-scale cohesive zone model are combined to quantitatively investigate microstructural damage evolution and its effect on fracture behavior of freeze-thawed concrete samples in three-point bending tests. A two-level micro-to-macro scale finite element model is developed based on computed tomography microstructural images with microcracks due to freeze-thaw cycles. The macroscopic load-deflection curves and fracture energies are simulated and compared favorably with experimental results. Simulation results demonstrate that microcracks caused by freeze-thaw actions are the primary reason for degradation of concrete mechanical properties. Fracture behaviors of frost-damaged concrete with different mortar and interfacial transition zone strength and fracture constants are also simulated and discussed. The combined X-ray nano-computed tomography technology and cohesive zone model proposed is effective in characterizing fracture behavior of concrete and capturing freezethaw cycle-induced microstructural damage evolution and its effect on fracture process of concrete.

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Fracture energy evolution of two concretes resistant to the action of freeze-thaw cycles

Cited by 13 publications

References 18 publications

Investigation of the Effect of Freeze-thaw Cycles on the Mechanical Properties of Hardened Self-compacting Concrete

Investigation of the Effect of Freeze-thaw Cycles on the Mechanical Properties of Hardened Self-compacting Concrete

The Influence of Additions in the Use of Glass Fibre Reinforced Cement as a Construction Material

Microstructural damage evolution and its effect on fracture behavior of concrete subjected to freeze-thaw cycles

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