Degradation of mechanical properties of cementitious materials exposed to wet–dry cycles of sulphate solution

Liao, Yingdi; Yang, Yu−Ching; Jiang, Chaohua; Feng, Xingguo; Chen, Denghong

doi:10.1179/1432891714z.0000000001070

Cited by 5 publications

(4 citation statements)

References 12 publications

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“…Through experiments, Robert et al [6] compared the volume expansion of concrete after soaking in sodium sulfate solution, the wet-dry circulation of sodium sulfate solution and the freeze-thaw cycle of sodium sulfate solution. The experiments showed that the volume expansion was the largest in the wet-dry cycle and that in the freeze-thaw cycle was the middle, in continuous immersion was the smallest, indicating that the wet-dry cycle has a very serious impact on the durability of the material.it was also observed through experiments that the mortars subjected to wet-dry cycles of sulphate attack were more severely damaged than ones immersed in a sulphate solution [7].…”

Section: Introductionmentioning

confidence: 50%

Compressive Strength of Cement Mortar Containing Carbon Nanotubes (CNTs) under Sulfate Attack and Dry-wet Cycling Environment

Li¹,

Jia²,

Shen³

et al. 2018

Proceedings of the 4th Annual International Conference on Material Engineering and Application (ICMEA 2017)

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Abstract-The compressive strength and hydration process of cement-based materials containing with carbon nanotubes (CNTs) were investigated in this paper. The experimental results showed that the compressive strength of QC-CNT group under standard curing and dry-wet cycles was higher than that of Control group under different testing ages; The compressive strength under the standard curing was higher than that of the same group under dry-wet cycles; With the increasing of dry-wet cycling age, the compressive strength of Control group and QC-CNT group decreased gradually. Hydration exothermic curve in 72h showed the same trend in Control group and QC-CNT group. Exothermic peaks appear basically the same period .The peak value and the hydration reaction rates in each stage of the QC-CNT group were always higher than those in the Control group. The experimental results show that CNT can significantly improve the sulfate resistance of cement-based materials in two aspects: preventing harmful ions from entering the material and preventing cracking.

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Section: Introductionmentioning

confidence: 50%

Compressive Strength of Cement Mortar Containing Carbon Nanotubes (CNTs) under Sulfate Attack and Dry-wet Cycling Environment

Li¹,

Jia²,

Shen³

et al. 2018

Proceedings of the 4th Annual International Conference on Material Engineering and Application (ICMEA 2017)

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“…As depicted in Figure 9, the peak value of the variation of the mass of structural EPS concretes under sulfate attack in this study was 1.68%, which is much smaller than that of plain concrete (12%) under the same experiment conditions [40]. It was owing to the incorporation of EPS beads and fly ash, low water:binder ratio, and the choice of cement type designed in this study that made the structural EPS concrete have superior sulfate resistance and less weight variation than ordinary concrete.…”

Section: Resultsmentioning

confidence: 91%

Study on the Fatigue and Durability Behavior of Structural Expanded Polystyrene Concretes

You

Miao

et al. 2019

Materials

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The fatigue and durability characteristics of structural expanded polystyrene concrete (EPS) are especially important when it was applied for structural elements in long-term service. In order to study the fatigue and durability behavior of structural EPS concrete, the long-term cyclic loading experiments and wetting–drying (W-D) cyclic experiments were conducted, respectively. The structural EPS concrete was found to have a relatively large damping and a fairly low dynamic elastic modulus under long-term cyclic load, which illustrated that it had a better energy absorption effect and toughness than plain concrete of the same strength level. Even if fine cracks appeared during the cyclic loading process, the relevant dynamic performance remained stable, which indicated that the structural EPS concrete had superior fatigue stability. In W-D cyclic experiments, the structural EPS concrete exhibited superior sulfate resistance. During the erosion test process, there was a positive correlation between the mass change and the evolution of the compressive strength of the structural EPS concrete, which indicated that ΔmB could be substituted for Δf to evaluate the degree of the structural EPS concrete eroded by sulfate attack. The study focuses on the fatigue performance and sulfate resistance of structural EPS concrete and is of important engineering value for promoting practical long-term operations.

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“…However, in alternating dry and wet conditions, there is a dual corrosion of physical and chemical factors. Liao et al [33] studied the effects of sulfate erosion on the mechanical properties of mortar. The results showed that mortar suffered more severe damage under sulfate solution wet-dry cycles than when simply immersed in sulfate solution.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effect of Environmental Water on the Mechanical Properties and Deterioration Process of Underground Engineering Masonry Mortar

Yang,

Cheng,

Cui

et al. 2024

Sustainability

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Urban underground engineering is generally buried at a shallow depth and suffers long-term environmental water effects such as rainfall, rivers, underground pipeline leakage, and groundwater. The mechanical properties of the structures are affected by constant deterioration, which seriously hinders the safe, healthy, and sustainable development of the city. On the basis of on-site investigation of civil defense engineering, this article simulates the water environment conditions of mortar in underground engineering in the laboratory and conducts manual sample preparation in the laboratory. Then, water, H2CO3, NaCl, and Na2CO3 solution or wet–dry cycles are used to corrode the sample, respectively. A uniaxial compression test, Brazilian splitting test, analyses of the acoustic emission signals and electromagnetic signals, and magnetic imaging testing are performed, respectively. The results show that an increase in the action time of environmental water leads to a gradual increase in the uniaxial compressive strength, tensile strength, and elastic modulus of cement mortar, but it will decrease over a long period of time. Different environmental water components can also lead to a different performance of soaked mortar. The uniaxial compressive strength R, tensile strength σt, and elastic modulus E of mortar samples exhibit values in different solutions in the order of H2CO3 solution < NaCl solution < Na2CO3 solution < water. A moderate solution soak time can enhance the mechanical properties of the mortar, but this effect decreases at long time scales. The effect of wet–dry cycles on the mechanical properties and degradation process of mortar is significant. With the increase in wet–dry cycles, the porosity of mortar continuously increases. The cumulative ringing count, energy, amplitude, and impact number of acoustic emission signals always increase when the samples are loaded to failure. The uniaxial compressive strength, tensile strength, and elastic modulus first increase and then decrease. The experimental results lay the foundation for further investigating the performance changes in mortar under complex water environments in underground engineering.

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Degradation of mechanical properties of cementitious materials exposed to wet–dry cycles of sulphate solution

Cited by 5 publications

References 12 publications

Compressive Strength of Cement Mortar Containing Carbon Nanotubes (CNTs) under Sulfate Attack and Dry-wet Cycling Environment

Compressive Strength of Cement Mortar Containing Carbon Nanotubes (CNTs) under Sulfate Attack and Dry-wet Cycling Environment

Study on the Fatigue and Durability Behavior of Structural Expanded Polystyrene Concretes

Experimental Study on the Effect of Environmental Water on the Mechanical Properties and Deterioration Process of Underground Engineering Masonry Mortar

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