Effect of cyclic wetting and drying on microstructure, composition and length changes of lime-based plasters

Jerman, Miloš; Scheinherrová, Lenka; Medveď, Igor; Krejsová, Jitka; Doleželová, Magdaléna; Bezdička, Petr; Černý, Robert

doi:10.1016/j.cemconcomp.2019.103411

Cited by 12 publications

(5 citation statements)

References 44 publications

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“…Research shows that the WDA intensifies deteriorating effect of concrete carbonation. Jerman et al (2019) found that WDA caused microstructure of cementitious matrix to become coarser which speeded up intrusion of CO2. H. Chang et al (2018) showed that the accelerated capillary suction induced by WDA and the direct penetration of CO2 into concrete during drying period caused more severe carbonation.…”

Section: Carbonationmentioning

confidence: 99%

Deterioration of marine concrete exposed to wetting-drying action

Ting

Wong

Rahman

et al. 2021

Journal of Cleaner Production

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The adverse effects of hostile marine environment on concrete structure have inevitably resulted in huge economic loss and may contribute to catastrophic failure. Concrete is susceptible to weathering, particularly under wetting-drying action (WDA), although its current state of the art is well established. The diverse characteristics of WDA at different site locations have compromised the reliability of laboratory works. The objective of this study is to review the impact of WDA on concrete and to provide an overview of the research trend, aiming to identify the research gap. Concrete deterioration mechanisms in marine environment in respect of WDA are identified. The influential factors of WDA are analyzed. The physical and mechanical properties and corrosion resistance of concrete exposed to WDA are discussed. WDA aggravates concrete deterioration by hastening intrusion of inimical compounds such as chloride, sulphate and carbon dioxide. Chloride convection zone can be expanded by two to three times to cause a significant concrete cover loss. Physical damage of concrete starts with efflorescence staining, followed by mortar delamination, aggregate detachment and concrete spalling, leading to loss of mechanical properties. The use of mineral admixtures such as fly ash and silica fume improves concrete resistance against corrosion, but its refining effect may lead to over-accumulation of chloride, risking the long-term durability. Limited research works are identified on synergy between physical and chemical deteriorations, validation of simulated experiment, volume expansion, mass change and tensile strength of concrete.

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Section: Carbonationmentioning

confidence: 99%

Deterioration of marine concrete exposed to wetting-drying action

Ting

Wong

Rahman

et al. 2021

Journal of Cleaner Production

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“…It was found that an aqueous environment with higher OH − concentration causes a significant increase in the growth rate of quartz fracture [24,25]. The weathering and dissolution of many mudstone minerals are caused by the reaction of pyrite with acids in the environment during oxidation [26][27][28]. After chemical etching of shale specimens, the soluble mineral composition decreases and clay minerals increase, while mineral cementation becomes loose and mineral edges become blurred.…”

Section: Introductionmentioning

confidence: 99%

Degradation Characteristics and Mechanism of Black Sandy Dolostone Subjected to Wetting–Drying Cycles

Zhu,

Luo,

et al. 2023

Minerals

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The cyclic wetting–drying (W–D) effect as a typical form of weathering causes the engineering properties of rock degradation. Unlike previous research on soft sedimentary rocks, this study sought to investigate the influence of W–D cycles on the physical and mechanical properties of the black sandy dolostone. The results show that the surface hardness and uniaxial compressive strength decreased by 1.5% and 17.2%, respectively, after 12 W–D cycles. The behavior of water absorption of dolostone showed a logarithmic growth with W–D cycles. Analysis of the pH and electrical conductivity values of the soaking solution and microstructure of dolostone revealed that carbonate mineral and feldspar dissolution was the major reason to result in the increase in pore volume and micro-fissure. The oxidation of pyrite contained in the rock was deduced to accelerate the chemical reaction and rock degradation. The obtained results are expected to provide engineering values for rock mechanics studies when compared with in situ conditions.

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“…In addition, the mass of the mortar increased to 2.74% after the exposure period compared to the control mortar (unaged cycling). Consumption water during the hydration process causes the formation of unsaturated pore space, and thus the mortar specimen continues to absorb water and increase its mass until it reaches maximum water saturation [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…Many investigations on the effects of weathering on the long-term properties of composite materials have been performed concerning durability [19], degradation mechanisms [13,16,20], microstructure and composition change [18,21], and mechanical performance [22][23][24][25][26]. However, most of the investigations focus on conventional concrete, while knowledge of natural fibre-reinforced composites is still limited.…”

Section: Introductionmentioning

confidence: 99%

Effects of Wetting and Drying Cycles on Microstructure Change and Mechanical Properties of Coconut Fibre-Reinforced Mortar

et al. 2022

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Natural fibre-reinforced cementitious composites are commonly used as outer construction materials. They usually suffer weather as a result of being expose to various types of climates. In this study, a series of experimental tests were carried out to investigate the deterioration mechanism and mechanical properties of mortars incorporating coconut fibres due to repeated wetting and drying. The results indicated that although the compressive strength was found to increase after the first cycle, both compressive and flexural strengths underwent a significant decrease in the fifth cycle. In addition, at high temperatures, mortar matrixes retain their stable structure, according to the results of TGA analysis. When wetting and drying curing was applied, there was a significant degradation of fibres in the mortar.

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Effect of cyclic wetting and drying on microstructure, composition and length changes of lime-based plasters

Cited by 12 publications

References 44 publications

Deterioration of marine concrete exposed to wetting-drying action

Deterioration of marine concrete exposed to wetting-drying action

Degradation Characteristics and Mechanism of Black Sandy Dolostone Subjected to Wetting–Drying Cycles

Effects of Wetting and Drying Cycles on Microstructure Change and Mechanical Properties of Coconut Fibre-Reinforced Mortar

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