Penetrability of lightweight aggregate concrete

Emiko, L.; Wee, T. H.; Tamilselvan, T.

doi:10.1680/macr.2010.62.3.201

Cited by 9 publications

(3 citation statements)

References 11 publications

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“…Zhao et al [22] reported that the water penetration was reduced for SFRLAC with saturated lightweight aggregates, and Ali et al [23] reported that the freeze-thaw resistance of lightweight aggregate concrete was improved at early ages by increasing the saturation level of aggregates. Although there were some contract conclusions [24,25] or no relationship [26,27] reported, the differences may be resulted from the different pores' structure (open or closed) and water absorption of lightweight aggregates [15,28,29].…”

Section: Proportion Of Sfrelcmentioning

confidence: 99%

Development of Steel Fiber‐Reinforced Expanded‐Shale Lightweight Concrete with High Freeze‐Thaw Resistance

Zhao

Zhang

Song

et al. 2018

Advances in Materials Science and Engineering

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For the popularized structural application, steel fiber-reinforced expanded-shale lightweight concrete (SFRELC) with high freeze-thaw resistance was developed. The experimental study of this paper figured out the effects of air-entraining content, volume fraction of steel fibers, and fine aggregate type. Results showed that while the less change of mass loss rate was taken place for SFRELC after 300 freeze-thaw cycles, the relative dynamic modulus of elasticity and the relative flexural strength presented clear trends of freeze-thaw resistance of SFRELC. The compound effect of the air-entraining agent and the steel fibers was found to support the SFRELC with high freeze-thaw resistance, and the mechanisms were explored with the aid of the test results of water penetration of SFRELC. The beneficial effect was appeared from the replacement of lightweight sand with manufactured sand. Based on the test results, suggestions are given out for the optimal mix proportion of SFRELC to satisfy the durability requirement of freeze-thaw resistance.

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Section: Proportion Of Sfrelcmentioning

confidence: 99%

Development of Steel Fiber‐Reinforced Expanded‐Shale Lightweight Concrete with High Freeze‐Thaw Resistance

Zhao

Zhang

Song

et al. 2018

Advances in Materials Science and Engineering

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“…Jin et al [3] proposed a chloride transport model by taking into account the influence of both initial and surface saturation due to wetting and drying cycles. Emiko et al [5] presented an experimental investigation into the factors affecting the sorption of water, chloride ingress and permeability of water into lightweight aggregate concrete. Bastidas-Arteaga et al [6] proposed a probabilistic mathematical model for chloride penetration in unsaturated concrete using random variables to represent the model parameters, material properties, and stochastic processes to environmental actions.…”

Section: Introductionmentioning

confidence: 99%

A double-porosity model for water flow in unsaturated concrete

Wang

et al. 2018

Applied Mathematical Modelling

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This paper presents a double-porosity model for describing the moisture flow in unsaturated concrete. The two porosities used in the model represent the small pores of nanoscale and large pores of micro-scale, both of which are partially saturated with the moisture transport described by Darcy's law but with different transport properties. The model is applied to investigate the internal variation of saturation in a concrete in response to the change of humidity in the environment where the concrete is exposed. It is found that during wetting and drying cycles, the desaturation zone in concrete created in the first cycle expands continuously during the subsequent drying-wetting cycles. The wetting and drying cycles can push the desaturation zone from the surface layer into inner concrete gradually. This feature has not been explored in existing transport models.

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“…Jin et al (2008) developed a chloride penetration model by taking into account the influence of initial saturation and surface saturation due to wet-dry cycles. Emiko et al (2010) presented an experimental study on the parameters affecting the sorption of water, chloride ingress and permeability of water into lightweight aggregate concrete. The parameters investigated include the water-to-cement ratio, aggregate type, initial moisture content, size, density and volume of lightweight aggregates and cement paste volume.…”

Section: Introductionmentioning

confidence: 99%

Modelling of chloride penetration in unsaturated concrete

Geng

Wang

2016

Advances in Cement Research

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In this paper, a new model is proposed to describe the coupled transport of ionic species and ionic solution in unsaturated concrete. The main difference between the present model and most existing models is the inclusion of osmotic effect due to small pore sizes and osmosis-flow due to electrochemical reactions taking place at two electrodes. Chemical-and electro-osmosis is a well-known phenomenon in soils and clays. Cement and concrete materials, whose microscopic properties are very similar to clays, are expected to have a similar behaviour. However, despite the large amount of work that has been published on the osmosis of soils and clays, there is very little work on the cement and concrete materials. The aim of this paper is to address this problem. The model proposed in the paper is applied to predict the chloride penetration in unsaturated concrete and the electrochemical chloride removal in chloride-contaminated concrete by applying an external current. Numerical examples are presented and results are validated using published experimental data. Notation C Cl concentration of chloride ions C k concentration of ionic species k (mol/m 3 ) C OH concentration of hydroxyl ions D k diffusion coefficient of ionic species k (m 2 /s) D o hydraulic diffusivity constant (m 2 /s) D w hydraulic diffusivity (m 2 /s) F Faraday constant (96 485 C/mol) I current density vector defined as current pass through per unit area of concrete (A/m 2 ) I current density, used in one-dimensional model (A/m 2 ) J k flux of ionic species k (mol/(m 2 s)) J k flux of ionic species k, used in one-dimensional model (mol/(m 2 s)) L p hydraulic conductivity matrix (m 4 /(N s)) L p hydraulic conductivity coefficient, used in one-dimensional model (m 4 /(N s)) M total number of ionic species in pore solution N k flux of ionic species k defined through pores (mol/(m 2 s)) p pore pressure (N/m 2 ) p o pore pressure when pores are dry (N/m 2 ) p 1 pore pressure when pores are fully saturated (N/m 2 ) q flow velocity of pore solution through pores (m/s) q c flow velocity of pore solution at cathode boundary (m/s) R universal gas constant (8·314 J/(K mol)) S k concentration of bound ions of ionic species k (mol/m 3 ) T absolute temperature (293 K)

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Penetrability of lightweight aggregate concrete

Cited by 9 publications

References 11 publications

Development of Steel Fiber‐Reinforced Expanded‐Shale Lightweight Concrete with High Freeze‐Thaw Resistance

Development of Steel Fiber‐Reinforced Expanded‐Shale Lightweight Concrete with High Freeze‐Thaw Resistance

A double-porosity model for water flow in unsaturated concrete

Modelling of chloride penetration in unsaturated concrete

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