Simulation of the volumetric deformation and changes in the pore structure of unsaturated cement-based materials subjected to freezing/thawing

Liu, Lin; Qin, Gang; Qin, Sainan; Tao, Guanghui

doi:10.1016/j.conbuildmat.2019.116964

Cited by 23 publications

(17 citation statements)

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“…A schematic diagram as shown in Figure 13 is conceived to distinctly describe the interactions among aggregate, mortar, and pores containing water. e formation of ice in pores first generates high pressure exerting on the wall of pores, which results in the cracking and expansion of cement paste [30]. Coarse aggregate generally has a higher elastic modulus than mortar.…”

Section: Discussionmentioning

confidence: 99%

Influence of Coarse Aggregate Concentration on the Frost Resistance of Non-Air-Entrained Concrete

Cai

Wang

et al. 2022

Journal of Engineering

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Aggregate-interlocking concrete is a kind of low-carbon and high-performance concrete, while the aggregate-interlocking concrete prepared by the distributing-filling coarse aggregate (DFCA) process worsens frost resistance than ordinary concrete. In order to better apply the aggregate-interlocking concrete, it is necessary to figure out the relationship between the frost resistance and the coarse aggregate concentration. In the study, three series of concretes, C30, C40, and C50, are designed, and the charge passed, scaling mass, water uptake, and penetration depth of NaCl solution are tested as indicators to account for the relationship between frost resistance and coarse aggregate concentration. The results indicate that aggregate still has a strong restraint effect on the permeability of concrete after freezing-thawing cycling, but compared to the unfrozen concrete, the charge passed of the concrete with higher aggregate concentration tends to increase more intensively. The scaling happens at both bulk mortar and interfaces between aggregate and mortar. The increase in aggregate concentration could restrain the scaling of mortar, but excessive aggregate concentration results in a significant increase in scaling mass. The concrete with higher coarse aggregate concentration could absorb more water during the freezing-thawing cycling, and the penetration depth of NaCl solution also increases with the increase of coarse aggregate concentration. The results reveal that the increase in aggregate concentration degrades the frost resistance of concrete, and the DFCA process could be applied in high-strength concrete to mitigate the negative effect of coarse aggregate on the frost resistance of concrete.

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Section: Discussionmentioning

confidence: 99%

Influence of Coarse Aggregate Concentration on the Frost Resistance of Non-Air-Entrained Concrete

Cai

Wang

et al. 2022

Journal of Engineering

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“…(a) Freezing deformation of saturated cement paste: the predicted results from the present model (including undrained and drained conditions) compared with experimental data from (Powers, 1949, 1958; Powers & Helmuth, 1953) and theoretical results from Liu et al. (2018, 2020) and Eriksson et al. (2018); (b) Freezing deformation of cement paste with 10% air voids: the predicted results of the present model compared with experimental data from (Powers, 1949, 1958; Powers & Helmuth, 1953) and simulation results from Liu et al.…”

Section: Verification and Analysismentioning

confidence: 96%

“…In this section, we first detailed the numerical solutions for solving the present model. Then, we test the proposed model by comparing it with available experimental data (Powers, 1949(Powers, , 1958Powers & Helmuth, 1953;Sun & Scherer, 2010) and theoretical results (Eriksson et al, 2018;Liu et al, 2018Liu et al, , 2020Yang et al, 2015) on the freezing behavior of saturated and air-entrained cement-based porous media (e.g., cement paste and mortar). In addition, we analyze the predicted results from the proposed model.…”

Section: Verification and Analysismentioning

confidence: 99%

“…Under the air-entrained conditions, the half distance of two adjacent air voids is provided that is, L = 0.4 mm. Following this set of experiments (Powers, 1949(Powers, , 1958Powers & Helmuth, 1953) and other studies (Coussy, 2005;Eriksson et al, 2018Eriksson et al, , 2021Koniorczyk et al, 2015;Liu et al, 2018Liu et al, , 2020Selvadurai & Suvorov, 2020;Zeng et al, 2011;Zhou, 2014), the parameters used in the simulation are given as follows: к = 3 × 10 −19 m 2 , λ m = 0.53 W/m•K, k m = 31.8 GPa, g m = 19.1 GPa, ω = 0.15 (saturated) and 1.0 (unsaturated), α m = 18 × 10 −6 K −1 . The remaining parameters are shown in Table 1.…”

Section: Numerical Solutionsmentioning

confidence: 99%

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New Insights Into Freezing Behavior of Saturated and Air‐Entrained Porous Media via a Micromechanics‐Based Thermo‐Hydro‐Mechanical Model

Guo

Wang

et al. 2023

Water Resources Research

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The freezing behavior of porous media, such as soils, rock, and cement-based materials, to name but a few, seriously endanger the safety of infrastructures in cold regions (Huang et al., 2022;Peng et al., 2016;Sheshukov & Nieber, 2011). Even though the famous air-entrainment method is normally used to reduce the severe swelling of porous media during freezing, frost damage is still a frequent occurrence (Beaudoin & MacInnis, 1974;Everett, 1961;Fagerlund, 1977). Actually, the freezing behavior of porous media is generated under a coupled thermo-hydro-mechanical (THM) condition at a low temperature and involves several complex aspects, such as microstructure characteristics and environmental factors. Specifically, part of the liquid water in confined pores gradually freezes and yields an important pore pressure during freezing, which not only induces the macroscopic deformation and microscopic porosity variation (i.e., mechanics field) but also changes the heat transfer (i.e., thermal field) and seepage (i.e., hydraulic pressure field) in porous media (Eriksson et al., 2018(Eriksson et al., , 2021. During the progressive freezing process of porous media, THM fields are fully coupled and provide three driving forces for freezing deformation (Coussy, 2005), namely, thermal stress, pore pressure, and stress induced by displacement or loading boundaries. The pore pressure can also be treated as the prestress (Yang et al., 2015). Moreover, the deformation and heat transfer abilities of porous media rely on the effective material properties, which in turn depend on the microstructure characteristics (

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“…Under the freeze-thaw weathering cycle effect, the change in rock mechanical properties is caused by the deterioration of the internal pore structure. Therefore, many researchers [25][26][27][28][29][30] have conducted much research through indoor experiments, numerical simulations, damage models, etc. Jiang [31] studied the response mechanism of two kinds of marble microstructures to the dynamic cyclic impact under the condition of freeze-thaw weathering cycles, and he found that under the cyclic dynamic impact, the two marble types exhibited the same trend: the porosity gradually decreased, the pore size continuously decreased, the pore structure tightened, and the permeability weakened.…”

Section: Introductionmentioning

confidence: 99%

Research on the Pore Evolution of Sandstone in Cold Regions under Freeze-Thaw Weathering Cycles Based on NMR

et al. 2020

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The evolution of the rock pore structure is an important factor influencing rock mechanical properties in cold regions. To study the mesoscopic evolution law of the rock pore structure under freeze-thaw weathering cycles, a freeze-thaw weathering cycle experiment was performed on red sandstone from the cold region of western China with temperatures ranging from -20°C to +20°C. The porosity, T2 spectral distribution, and magnetic resonance imaging (MRI) characteristics of the red sandstone after 0, 20, 40, 60, 80, 100, and 120 freeze-thaw weathering cycles were measured by the nondestructive detection technique nuclear magnetic resonance (NMR). The results show that the porosity of sandstone decreases first and then increases with the increase of the freeze-thaw weathering cycles and reaches the minimum at 60 of freeze-thaw weathering cycles. The evolution characteristics of porosity can be divided into three stages, namely, the abrupt decrease in porosity, the slow decrease in porosity, and the steady increase in porosity. The evolution characteristics of the T2 spectrum distribution, movable fluid porosity (MFP), and MRI images in response to the freeze-thaw weathering process are positively correlated with the porosity. Analysis of the experimental data reveals that the decrease in the porosity of the red sandstone is mainly governed by mesopores, which is related to the water swelling phenomenon of montmorillonite. Hence, the pore connectivity decreases. As the number of freeze-thaw cycles increases, the effect of the hydrophysical reaction on the porosity gradually disappears, and the frost heaving effect caused by the water-ice phase transition gradually dominates the pore evolution law of red sandstone.

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Simulation of the volumetric deformation and changes in the pore structure of unsaturated cement-based materials subjected to freezing/thawing

Cited by 23 publications

References 23 publications

Influence of Coarse Aggregate Concentration on the Frost Resistance of Non-Air-Entrained Concrete

Influence of Coarse Aggregate Concentration on the Frost Resistance of Non-Air-Entrained Concrete

New Insights Into Freezing Behavior of Saturated and Air‐Entrained Porous Media via a Micromechanics‐Based Thermo‐Hydro‐Mechanical Model

Research on the Pore Evolution of Sandstone in Cold Regions under Freeze-Thaw Weathering Cycles Based on NMR

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