Characterization and Analysis of the Carbonation Process of a Lime Mortar Obtained from Phosphogypsum Waste

Romero-Hermida, M. I.; Borrero-López, Antonio M.; Alés, Vicente Flores; Sánchez, Francisco Javier Alejandre; Franco, J.M.; Santos, Andressa dos; Esquivias, L.

doi:10.3390/ijerph18126664

Cited by 11 publications

(4 citation statements)

References 35 publications

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“…It mainly focuses on the causes of cracks, crack control and numerical simulation, characteristics of cracks, and so on [10][11][12][13]. However, there are relatively few experimental studies on the carbonation law of concrete at the crack [14][15][16][17]. Miao et al [18] found that micro cracks and micropores in concrete were important factors affecting the The goal of this research is to decipher the carbonation law of cracked cement paste and to investigate the carbonation mechanism.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Carbonation Behavior of Cracked Concrete

et al. 2022

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The crack and carbonation of concrete pose a great challenge to its durability. Therefore, this paper studies the effect of cracks on the carbonation depth of cement paste under different factors. The relationship between carbonation and cracks was determined, and the carbonation mechanism of cement paste with cracks was clarified. The results show that a small water–binder ratio can effectively inhibit the carbonation process. The bidirectional carbonation enlarged the carbonation area around the crack. Within 21 days of the carbonation, the carbonation depth increased with carbonation time, and the Ca(OH)2 on the surface of the specimen was sufficient, allowing for a convenient chemical reaction with CO2. The influence of crack width on the carbonation process at the crack was greater than the influence of the crack depth. Carbonation influenced the hydration of cement-based materials, altering the types and quantities of hydration products. In conclusion, accurately predicting the regularity of carbonation in cracked structures is critical for improving the durability of concrete.

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Section: Introductionmentioning

confidence: 99%

Analysis of Carbonation Behavior of Cracked Concrete

et al. 2022

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“…The effectiveness of carbonation prevention measures varies based on factors such as the composition of mortar or concrete, pore condition, concrete class, ambient conditions, insulation, and time. One approach to preventing carbonation, which can infiltrate the structure from the surface through gaps and cracks, is to incorporate various mineral admixtures, nanoalloy structures, fly ash, silica fume, slag, and other materials to reduce the porosity of the structure [76][77][78]. Ca(OH) 2 , a hydration product of cement, reacts with CO 2 from the environment during the use of mortar or concrete and transforms into CaCO 3 .…”

Section: Mortar Strength Setting Times and Durability Studiesmentioning

confidence: 99%

Investigation of the use of cobalt and nickel based nanoalloys as cement mortar additives

Karaduman,

Pişkin

2024

Mater. Res. Express

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The usage potential of chemical and green synthesized cobalt (Co) and nickel (Ni) nanoalloys (CoNiNAs) as mortar additives at different ratios was evaluated. The CoCl2 and NiCl2 metallic salt solutions were mixed in volume ratios of 1-1, 1-2, and 2-1 and reduced with NaBH4 and St. John's Wort aqueous extract, respectively. The obtained Co-Ni based complex nanoalloys were analyzed by Ultraviolet-Visible Spectroscopy (UV-Vis), X-Ray Diffraction Analysis (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), Fourier Transform Infrared Spectroscopy (FT-IR), and Dynamic Light Scattering Particle Size Analyzer (DLS). The effect of CoNiNAs was investigated based on the amount used in mortar, flexural and compressive strengths of mortar, setting time retarder properties, and carbonation depth measurements of mortars and nanoalloy form based on whether they were solid (chemical synthesise) or liquid (green synthesise). The results revealed that the chemical synthesized CoNiNAs were amorphous metal-metal-oxide complexes with small spherical particles and a low dispersity index, whereas the green synthesized complexes had a more crystalline structure and smaller sizes. The mortar properties were affected by Co and Ni synthesis ratios and addition amounts. The incorporation of CoNiNAs led to an increase in the setting times of mortar. Furthermore, the ‘CN’ 2% sample exhibited the highest compression (49.10±1.19 MPa) and flexural (8.19±0.20 MPa) strengths. In addition, the ‘CN2’ 1% sample exhibited the lowest carbonation depth (2.95±0.35 mm) compared to other samples. Overall, mortars with CoNiNAs additives may be used in high temperature environments, and long shipment times require remote locations due to setting time retarder effect without losing necessary physical properties.

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“…Carbonation is a natural process of lime reacting with carbon dioxide present in the atmosphere to form stable calcium carbonate for strength achievement. By spraying the indicator solution, the sample changes to a purple-red color (pH > 9.5); the presence of portlandite and calcite together means that the sample acquires a soft pink hue (8 < pH < 9.5); the presence of calcite only means that a colorless area is observed (pH < 8) [46].…”

Section: Carbonation (Phenolphthalein Indicator Test)mentioning

confidence: 99%

Properties of Air Lime Mortar with Bio-Additives

Manoharan

Umarani

2022

Sustainability

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Lime mortar has been a primary binding material in ancient mortar, and is one of the main reasons behind solid and stable constructions that remain stable even after thousands of years. The benefits of lime are innumerable: it is minimally processed and used with a lesser carbon footprint and embodied energy and, most crucially, it is a carbon absorbent. This research experiments with the strength properties (compression) of lime at 28, 56, and 100 days of air curing. The investigation studies the durability using water absorption, UPV test, and carbonation parameters after 100 days of exposure to air. The tested materials are subjected to SEM analysis to find the morphology of the reaction that takes place and the products that are formed. We also performed a comparative study of two different fermented additives by the duration of fermentation (1 day and 10 days) and two different doses of additives (Jaggery and Kadukkai) with air lime. The bio-additives were experimented with using gas chromatography and mass spectroscopy for the formation of new enriching compounds, which improved the qualities of traditional lime mortar. The formation of fat and protein in the additives was found using IS 7219-1973 (a method for the determination of protein in foods and feeds). Using the AOAC method, the presence of fat confirms the improvement in strength and durability properties. The phytochemical analysis details the alkaloids, terpenoids, steroids, phenols, flavonoids, tannins, glycosides, and saponins. Quantification of phenols and flavonoids adds to the beneficial aspects of the fermented additives. The experimental results indicate that using naturally fermented organic materials in the lime has made the structures stronger with the stable build of calcite and vaterite components. The self-healing capacity of lime mortar makes it time resistant.

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Characterization and Analysis of the Carbonation Process of a Lime Mortar Obtained from Phosphogypsum Waste

Cited by 11 publications

References 35 publications

Analysis of Carbonation Behavior of Cracked Concrete

Analysis of Carbonation Behavior of Cracked Concrete

Investigation of the use of cobalt and nickel based nanoalloys as cement mortar additives

Properties of Air Lime Mortar with Bio-Additives

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