The effects of mixture’s components on the mechanical properties and durability indicators of mixed mortar using simplex network method

Souza, Alessandra Tolentino; Caldas, Rodrigo Barreto; Ludvig, Péter

doi:10.1016/j.conbuildmat.2020.118740

Cited by 9 publications

(8 citation statements)

References 32 publications

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“…Furthermore, the water absorption via the capillarity coefficient increased (maxim 25.29% increase in 20% dregs) as the content of dregs increased (Figure 9). However, known that the phenomena related to capillarity are different when comparing mo produced with and without hydrated lime [16,17,34]. In this sense, Marvila and workers [35] affirm that lime acts similarly to sand in relation to capillarity, increasing absorption coefficient.…”

Section: Physical Properties In Fresh and Hardened Statementioning

confidence: 99%

“…This capillarity can reduce the useful life of mortar due to the carrying of aggressive agents, however, it can allow the entry of C (CO2 capture) and increase the mortar's mechanical resistance due to carbonation [34] Furthermore, the water absorption via the capillarity coefficient increased (maximum 25.29% increase in 20% dregs) as the content of dregs increased (Figure 9). However, it is known that the phenomena related to capillarity are different when comparing mortar produced with and without hydrated lime [16,17,34]. In this sense, Marvila and co-workers [35] affirm that lime acts similarly to sand in relation to capillarity, increasing the absorption coefficient.…”

Section: Physical Properties In Fresh and Hardened Statementioning

confidence: 99%

“…In this sense, Marvila and co-workers [35] affirm that lime acts similarly to sand in relation to capillarity, increasing the absorption coefficient. When lime is used as a binder, capillarity cannot be fully explained based on the porosity of the mortar and the presence of capillary pores [17,34]. However, even though an increase in the capillarity coefficient was achieved with the use of the dregs, all the types of mortar studied presented a capillarity coefficient greater than 10 g/dm 2 /min 2 and can be classified in the same class according to NBR 13281 (C6 group) [33], which is a high level of capillarity.…”

Section: Physical Properties In Fresh and Hardened Statementioning

confidence: 99%

“…Ettringite (3CaO.Al2O3.3CaSO4.32H2O-hydrated calcium trisulfoaluminate) has a long, narrow rod shape of approximately 4-5 µm (Figures 14 and 15). It represents 20% to 25% of the volume of solids in a fully hydrated slurry [17,34,43]. The precipitation of ettringite is initiated when Portland cement is mixed with water, wherein gypsum is used as a regulating source of the cement setting time dissolving and releasing sulfate and calcium ions; these ions are the first to enter the solution, followed by aluminate and calcium ions from the dissolution of C3A in the cement.…”

Section: (Itz)mentioning

confidence: 99%

“…The mixing procedure was performed in a planetary mortar mixer, wherein the dry materials were mixed at low speed (140 rpm) for 30 s in order to homogenize the powders. Afterward, 75% of the water was added and mixed at high speed (220 rpm) for 60 s. Finally, the remaining water was added and mixed again at low speed (140 rpm) for another 60 s. Thereafter, the final amount of water was adjusted to ensure a consistency of 260 ± 10 mm in the flow table since consistencies above 270 mm generate types of mortar that were light, workable, and prone to exudation [17].…”

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Use of Dregs as a Replacement for Hydrated Lime in Cement Coating Mortar

et al. 2023

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The pulp and paper industry generates a significant volume of solid waste during its operations. In order to mitigate the environmental impact caused by this industry, one of its residues was applied in eco-friendly composites. Therefore, this research aims to use green liquor dregs as a partial replacement for lime in coating mortars. Hydrated lime was replaced by dregs in percentages of 10%, 15%, 20%, and 30%, and the manufactured mortar specimens were tested in terms of their flowability, air content, and specific gravity in the fresh state. In the hardened state, physical and chemical characterization was carried out to determine the influence of the introduction of the dregs on the properties of the different types of mortar. Mechanical testing of the mortar specimens’ compressive, flexural, and adhesive strengths was carried out, and scanning electron microscopy was performed to evaluate the microstructural features of the cement composites. In general, the types of mortar with dregs showed a high degree of similarity to conventional mortar in all studied aspects, including the 30% replacement group. The obtained SEM images indicated that the presence of dregs in the mortar did not change the formational mechanism of C-S-H crystals, maintaining the mechanical properties of the material even after the accelerated aging procedure was performed, reaching similar levels of flexural, compressive, and tensile bond strengths when compared to the neat mortar. Furthermore, tensile bond levels reached approximately 0.9 MPa for all the studied types of mortar, allowing the material to be used in external applications.

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Section: Physical Properties In Fresh and Hardened Statementioning

confidence: 99%

Section: Physical Properties In Fresh and Hardened Statementioning

confidence: 99%

Section: Physical Properties In Fresh and Hardened Statementioning

confidence: 99%

Section: (Itz)mentioning

confidence: 99%

mentioning

confidence: 99%

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Use of Dregs as a Replacement for Hydrated Lime in Cement Coating Mortar

et al. 2023

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Mix Design Method for Coating Mixed Mortar According to Influence of the Aggregate Type and Application Environment Conditions

Leão,

da Silva,

Pedrotti

et al. 2024

Int J Civ Eng

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Lime-based mortars with added silica fume and bioproducts for restoration and preservation of heritage buildings

et al. 2023

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Restoration of heritage buildings requires an appropriate choice of materials, as inappropriate materials can lead to degradation rather than preservation. Hydrated lime and sand mortars are the most suitable for masonry cladding. However, they have low durability regarding current requirements. This work investigates the use of silica fume and/or biopolymers (egg albumen and additive derived from the reuse of milk unfit for human consumption (complexes of whey protein with κ-casein) in producing these mortars. Some mortars were characterized by mechanical properties (compressive and diametric strength, absorption rate) and chemical properties (SEM, Infrared spectrum). The research revealed that silica fume addition allows an increase of more than 50% in the mechanical strength of the mortars when associated with animal protein. The value may be higher than 60%, especially for biopolymers (complexes of whey protein with κ-casein). Finally, the proteins in the mortar mixture provide intense air entry that results in the formation of more pores. This increase in voids allows more CO 2 to enter, directly contributing to a faster carbonation process and performance mortar.

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The effects of mixture’s components on the mechanical properties and durability indicators of mixed mortar using simplex network method

Cited by 9 publications

References 32 publications

Use of Dregs as a Replacement for Hydrated Lime in Cement Coating Mortar

Use of Dregs as a Replacement for Hydrated Lime in Cement Coating Mortar

Mix Design Method for Coating Mixed Mortar According to Influence of the Aggregate Type and Application Environment Conditions

Lime-based mortars with added silica fume and bioproducts for restoration and preservation of heritage buildings

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