Modelling of Damage Spatiotemporal Distribution in Saturated Cementitious Materials and its Chloride Transport Evolution

Abstract

Crack-induced damage significantly affects the chloride transport mechanism in cementitious materials. To quantitatively evaluate the crack effects, a coupled model was proposed in this paper for saturated cement paste with various uniaxial tensile damage. First, the 3D microstructure of hydrating cement paste was simulated based on a voxel-based hydration model, and its damaged spatiotemporal distribution under uniaxial tensile stress was simulated using a finite-element model. Based on the damaged cement paste, an electrical Modelling framework was presented to simulate the chloride transport. The results show that the damage spatiotemporal distribution in saturated cementitious materials with uniaxial tensile and its chloride transport evolution can be successfully modelled using the self-created model and coupled method. the damage of cementitious material is an accumulation process of cracks spread over the main crack. During the process, the crack connectivity and crack width affect chloride transport and its fracture-volume threshold value is 1.40%. Compared to studies published, the coupled model could well simulate chloride transport in saturated cementitious materials with uniaxial tensile damage.

Computational methods of mass transport in concrete under stress and crack conditions: A review

“…The results showed that naturally formed cracks obtained through mechanical loading methods can be utilized to analyze the impact of morphological parameters, such as crack tortuosity and connectivity, on chloride erosion. The currently main used methods for mechanically generating cracks can be divided into four-point bending method [32,33], center expansion method [27], splitting method, and Wedge splitting method [34,35]. It should be noted, however, that cracks obtained through mechanical loading methods are influenced by loading conditions and material properties, and the characteristics of these cracks exhibit greater discretization.…”

“…[30], © Elsevier Ltd., 2012; (c) four-point bending method [32,33], reproduced with permission from Ref. [32], © ASCE, 2011; (d) center expansion method [27]; (e) splitting method [4,24]; and (f) Wedge splitting method [34,35], reproduced with permission from Ref. [34], © RILEM, 2007.…”

“…The study of transport characteristics in cracked concrete has emerged as a popular research topic in the field of concrete materials science. Numerous scholars [22][23][24][25][26][27][28][29] have conducted in-depth investigations in this area and proposed various models and theories to describe the transport characteristics of cracked concrete. These models include empirical models based on experimental data and theoretical models based on physical principles.…”

Comparative Study of the Performance of Underwater Concrete between Anionic and Nonionic Anti-Washout Admixtures

“…In summary, anionic AWAs exhibit superior strength development, attributable to their temporally regulated cement hydration. This contrasts with the uncontrolled pore structure modifications induced by nonionic stabilization [50]. Manipulating the ionic character and solubility of AWAs has emerged as a promising route for balancing the demands of underwater concrete rheology, setting, and structural performance.…”

Composite Hydrophobic Coatings with Progressive High Penetration through Chromatography: Protective Properties and Mechanisms

“…Sulfate, carbonation, freeze–thaw, and other problems caused by the deterioration of concrete can lead to many economic losses and safety hazards. − The use of deicing salts can lead to corrosion of reinforcing steel in the concrete, which can also increase the deterioration of the concrete. − It is estimated that of the more than 617,000 bridges currently owned by the United States, 42% are at least 50 years old, and 46,154 (7.5%) are considered deficient. As the condition of bridges continues to deteriorate, more bridges will need repair each year. − In China, the problem of aging concrete structures is also very serious.…”