Capillary water absorption in cracked and uncracked mortar – A comparison between experimental study and finite element analysis

Belleghem, Bjorn Van; Montoya, R.; Dewanckele, Jan; Steen, Nils Van den; Graeve, Iris De; Deconinck, Johan; Cnudde, Veerle; Tittelboom, Kim Van; Belie, Nele De

doi:10.1016/j.conbuildmat.2016.02.027

Cited by 97 publications

(50 citation statements)

References 23 publications

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“…Concrete is the most widely used building material in civil engineering and its durability has always been the focus of attention . Many factors affect the durability of concrete, such as reinforcement corrosion, freeze–thaw cycles, concrete carbonization, and chloride ion erosion, which are directly influenced by moisture transportation . Absorption is one of the key mechanisms of moisture transportation in cement‐based materials and is closely related to pore structure .…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Zhao

Ding

Huang

et al. 2019

Structural Concrete

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Capillary absorption capacity has an important influence on the durability of concrete and is closely related to pore structure. In this study, the pore structure and capillary water absorption of samples were determined by low-field nuclear magnetic resonance spectroscopy and the gravimetric method, respectively. The test results show that the most probable pore diameter and equivalent pore diameter of cement-based materials increase with increasing water to cement ratio (w/c) and fly ash (FA) content and decrease with increasing curing age and cement to sand ratio (c/s). The porosity of cement-based materials increases with increasing w/c and c/s, decreases with increasing curing age, and first decreases and then increases with increasing FA content. The curves for the amount of capillary water absorption per unit area in specimens with the square root of time for cement-based material under different influence factors are similar and show obvious linear and stable stages.The capillary absorption coefficient is nearly linearly related to w/c or c/s, and nonlinearly related to curing age or FA content, observation that are well correlated with the porosity and square root of the equivalent pore radius. A modified model is proposed for the capillary absorption coefficient with consideration of the pore structure, and the theoretical results of the model are in good agreement with the test results. K E Y W O R D Scapillary absorption coefficient, cement-based materials, equivalent pore radius, low-field nuclear magnetic resonance spectroscopy, modified model, porosity Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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Section: Introductionmentioning

confidence: 99%

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Zhao

Ding

Huang

et al. 2019

Structural Concrete

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“…Capillarity is the dominant factor of water absorption when gravity is negligible owing to a very small maximum height of the water frontier (Hall 1989;Belleghem et al 2016). Conventionally, the extended Darcy's law is used to describe absorption driven by the capillary force, with the original permeability replaced with an unsaturated permeability, which is dependent on the water content in the case of cement-based material.…”

Section: Improved Modeling 231 Hydraulic and Capillary Potentialsmentioning

confidence: 99%

“…In practical applications, n is often set within 6-8, while D 0 is calculated based on the experimentally determined sorptivity (Wang and Ueda 2011), which is defined as the slope of the cumulative absorbed water curve expressed by the 1/ 2 t law (Hall and Hoff 2011). This model has been confirmed to be useful in some cases (Wang and Ueda 2011;Belleghem et al 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Many experimental and analytical studies involving water absorption have been conducted (Hall 1989;van Belleghem et al 2016), and several unsaturated permeability models have been proposed to predict moisture and water transport. Most of the models use the extended Darcy's law to describe the unsaturated flow through a porous medium (Maekawa et al 2003).…”

Section: Introductionmentioning

confidence: 99%

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Hygro-Gradient Model for Permeability of Unsaturated Cementitious Composites

Han

Maekawa

2017

ACT

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A new method for predicting the water absorption process of unsaturated cementitious composites is proposed, and its functionality is experimentally verified. The mechanism of the capillarity on water absorption process is mathematically termed by a slip boundary condition of micro-flow of pore water, and employed to an unsaturated water permeation on the scheme of multi-scale modeling. The rapid sorption just after the exposure to condensed water is fairly simulated owing to the non-local formulation of hygro-gradient, which simply represents the thermodynamics of non-equilibrated states in dry pores. The proposed model of complexity of micro-pore connection is examined in terms of the initial water content, porosity and saturation of micro-pore structure and volume ratio of aggregate. It is further examined in terms of the intrinsic hydraulic profile by using the Boltzmann's transform.

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“…[25][26][27][28] as well as aggressive substances, such as carbon dioxide and chlorides, see e.g. [29].…”

Section: Cracks and Ingress 23mentioning

confidence: 99%

Multi-scale and multi-physics deterioration modelling for design and assessment of reinforced concrete structures

Michel¹,

Lepech²,

Wu³

et al. 2017

RILEM Tech Lett

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This paper discusses the need for reliable and valid multi-scale and multi-physics prediction models to support the design of new as well as the assessment, maintenance, and repair of existing reinforced concrete structures. A multi-physics and multi-scale deterioration model for chloride-induced corrosion of reinforced concrete has been established. Ongoing work includes extension of the model to 3D as well as modelling of the impact of the steel-concrete interface characteristics and electrochemical potential on chloride thresholds. Identified challenges include, among others, the improved understanding and modelling of single-and multi-deterioration mechanisms, environmental exposure, and data for validation. We envision that next generation maintenance and management of reinforced concrete infrastructure will combine numerical simulations based on multi-scale and multi-physics principles and extensive in-situ monitoring, allowing continuous Bayesian updating of 4D simulations of functional performance.

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Capillary water absorption in cracked and uncracked mortar – A comparison between experimental study and finite element analysis

Cited by 97 publications

References 23 publications

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Hygro-Gradient Model for Permeability of Unsaturated Cementitious Composites

Multi-scale and multi-physics deterioration modelling for design and assessment of reinforced concrete structures

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