Micro-Ice-Lens Formation in Porous Solid

Setzer, Μ.J.

doi:10.1006/jcis.2001.7828

Cited by 210 publications

(78 citation statements)

References 8 publications

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“…The expansion of the concrete occurs, consequently, in the heating part of the cycle where the effect of the suction disappears. This behaviour can be explained by previously published models (26).…”

Section: Freeze-thaw Testssupporting

confidence: 72%

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

Enfedaque¹,

Romero²,

Gálvez³

2014

Mater. construcc.

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ABSTRACT:The current standards that regulate use of structural concrete have highlighted the durability of concrete. However, how the fracture energy of concrete evolves under the action of freeze-thaw cycles is not well known. The fracture energy of two types of concrete, one with an air-entraining additive and the other with silica fume addition, is studied after four, 14 and 28 freeze-thaw cycles. The results obtained show that the concrete with an air-entraining additive was undamaged and that fracture energy grew slightly. In addition to this, they also showed that the concrete with silica fume addition suffered severe surface scaling and its fracture energy changed due to the greater fracture areas generated. KEYWORDS: RESUMEN: Evolución de la energía de fractura de dos hormigones resistentes a la acción de ciclos hielo-deshielo.La actual normativa que rige el empleo de hormigón estructural ha puesto enfásis en la durabilidad del hormigón. Sin embargo, no se conoce cómo evoluciona la energía de fractura del hormigón sometido a ciclos hielodeshielo, lo cual es de vital importancia para asegurar la durabilidad y el correcto comportamiento mecánico de las estructuras de hormigón en entornos con heladas durante su vida útil. Se ha estudiado la evolución de la energía de fractura de un hormigón con aireante y de un hormigón con humo de sílice después de 4, 14 y 28 ciclos hielo-deshielo realizando ensayos de fractura. Los resultados muestran cómo el hormigón con aireante no sufre daño por los ciclos hielo-deshielo y cómo la energía de fractura del mismo aumenta ligeramente. El hormigón con humo de sílice se daña por los ciclos hielo-deshielo y reduce su energía de fractura al aumentar el area fracturada. PALABRAS CLAVE:

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Section: Freeze-thaw Testssupporting

confidence: 72%

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

Enfedaque¹,

Romero²,

Gálvez³

2014

Mater. construcc.

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“…Researchers in geotechnical engineering have developed a number of the THM models, including (1) coupled models for heat, moisture, and/or air transfer [10][11][12][13][14][15][16][17][18][19][20], (2) granular-level freezing process of pore water in soillike porous media [21][22][23][24][25][26], and (3) frost heaving in earth structures [27][28][29][30][31][32][33][34][35][36][37][38].…”

Section: Coupled Thermo-hydro-mechanical (Thm) Modelsmentioning

confidence: 99%

Nonparametric Monitoring for Geotechnical Structures Subject to Long-Term Environmental Change

Yun

Reddi

2011

Advances in Civil Engineering

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A nonparametric, data-driven methodology of monitoring for geotechnical structures subject to long-term environmental change is discussed. Avoiding physical assumptions or excessive simplification of the monitored structures, the nonparametric monitoring methodology presented in this paper provides reliable performance-related information particularly when the collection of sensor data is limited. For the validation of the nonparametric methodology, a field case study was performed using a full-scale retaining wall, which had been monitored for three years using three tilt gauges. Using the very limited sensor data, it is demonstrated that important performance-related information, such as drainage performance and sensor damage, could be disentangled from significant daily, seasonal and multiyear environmental variations. Extensive literature review on recent developments of parametric and nonparametric data processing techniques for geotechnical applications is also presented.

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“…미세한 다공극 구조인 콘크리트 복합체가 반복적 동결 융해를 받을 때, 재료 구성의 변화 (물-시멘트 비 7,8) , 포 화도 9) , 바닷물 등의 염화이온 7,8) , 연행공기량 3,10,11,12) , 겔-케 필러리 공극 구조 6,8) , 혼화재료 2) , 골재의 종류 및 비율 16) ) 와 외부 조건의 영향 (포화도 3,4) , 상대습도 13) , 외부온도, 온도 반복 주기 및 진폭 을 사용할 수 있다. 공극 구조 내의 포화도는 상 대습도 또는 외부 수분 공급량에 비례적이며 15) , 포화도가 91%를 초과하면 동결 시 팽창 현상이 발생하게 된다 . 반복적 동결융해에 의해서 열화현상이 누적해서 증대 됨은 많은 실험과 현장에서 발견되고 있으며, Ueda…”

Section: -7)unclassified

Development of Deterioration Prediction Model and Reliability Model for the Cyclic Freeze-Thaw of Concrete Structures

2008

Journal of the Korea Concrete Institute

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The initiation and growth processes of cyclic ice body in porous systems are affected by the thermo-physical and mass transport properties, as well as gradients of temperature and chemical potentials. Furthermore, the diffusivity of deicing chemicals shows significantly higher value under cyclic freeze-thaw conditions. Consequently, the disintegration of concrete structures is aggravated at marine environments, higher altitudes, and northern areas. However, the properties of cyclic freeze-thaw with crack growth and the deterioration by the accumulated damages are hard to identify in tests. In order to predict the accumulated damages by cyclic freeze-thaw, a regression analysis by the response surface method (RSM) is used. The important parameters for cyclic freeze-thawdeterioration of concrete structures, such as water to cement ratio, entrained air pores, and the number of cycles of freezing and thawing, are used to compose the limit state function. The regression equation fitted to the important deterioration criteria, such as accumulated plastic deformation, relative dynamic modulus, or equivalent plastic deformations, were used as the probabilistic evaluations of performance for the degraded structural resistance. The predicted results of relative dynamic modulus and residual strains after 300 cycles of freeze-thaw show very good agreements with the experimental results. The RSM result can be used to predict the probability of occurrence for designer specified critical values. Therefore, it is possible to evaluate the life cycle management of concrete structures considering the accumulated damages due to the cyclic freeze-thaw using the proposed prediction method.

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Micro-Ice-Lens Formation in Porous Solid

Cited by 210 publications

References 8 publications

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

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

Nonparametric Monitoring for Geotechnical Structures Subject to Long-Term Environmental Change

Development of Deterioration Prediction Model and Reliability Model for the Cyclic Freeze-Thaw of Concrete Structures

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