Effect of fatty acid soap on microstructure of lime-cement mortar

Lagazzo, Alberto; Vicini, Silvia; Cattaneo, Claudia; Botter, R.

doi:10.1016/j.conbuildmat.2016.04.122

Cited by 35 publications

(30 citation statements)

References 13 publications

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“…At the macroscopic scale, some cracks were also observed due to thermal shrinkage. In accordance with literature, 40 the samples crystallized forming leucite after heating at 1200°C; a residual glass phase was still present in the samples.…”

Section: Resultssupporting

confidence: 90%

“…The creation of hierarchical porosity in geopolymers is therefore based on micro-and meso-pores due to the elimination by washing or burning of soluble and volatile byproducts of saponification (glycerol and soaps), and on interconnected macropores due to the foaming action of soaps. 16,17,[40][41][42][43][44][45][46] In this work, TAGs or monoesters with different aliphatic chain features were tested in order to verify their influence on the processing of geopolymers with hierarchical porosity.…”

Section: Background On Saponificationmentioning

confidence: 99%

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Geopolymer foams obtained by the saponification/peroxide/gelcasting combined route using different soap foam precursors

et al. 2017

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This work investigates the influence of eight different vegetable and animal sources of fatty acids as soap foam precursors in the processing of highly porous geopolymers. Four sources rich in saturated chains (coconut and babassu oils, palm stearin and beef tallow), two sources rich in monounsaturated chains (olive and castor oils) and two sources rich in polyunsaturated chains (sunflower oil and soybean biodiesel) were selected. For all soap precursors, bodies treated at 300°C possessed a very high total porosity (84-88 vol%), open porosity (79-85 vol%) and relatively high specific surface area (35.1-63.5 m 2 /g), but rather low compressive strength (0.2-0.4 MPa). The increase in the thermal treatment temperature caused a slight decrease in porosity but a substantial increase in compressive strength and decrease in specific surface area due to sintering and formation of crystalline phases. The Darcian permeability coefficients of all bodies (0.6-10.6910 À10 m 2 ) were typical of gelcasted foams, aerosol filters and fibrous mats.The morphology of pores could be well-associated to the features of lathers produced by the respective soap precursors.

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Section: Resultssupporting

confidence: 90%

Section: Background On Saponificationmentioning

confidence: 99%

Geopolymer foams obtained by the saponification/peroxide/gelcasting combined route using different soap foam precursors

et al. 2017

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“…A Tabela 6 apresenta os valores de coeficientes de capilaridade das argamassas estudadas por [12] no traço 1:1:6 (REF, REFP25, REFC, FC15, FC30, A50, P50, 025, P25FC30, P25FPP, V50, V25), sempre mantendo constante as quantidades de cimento e cal hidratada e utilizando diferentes tipos de agregados. Nessa mesma tabela estão indicados os valores encontrados por [13] para argamassas no traço 1:1:6 utilizando agregado de concreto reciclado (recycled concrete aggregate) em substituição ao agregado natural (natural aggregate) em diferentes proporções (CLM0%, CLM25%, CLM50%, CLM100%).…”

Section: Resultsunclassified

“…O traço padrão utilizado, em massa, foi 1:1:6, que representa as proporções 1 de cimento, 1 de cal hidratada e 6 de areia. Esse traço foi escolhido pelo seu uso ser consagrado no estudo de argamassas de revestimento, já tendo sido usado por vários autores [8][9][10][11][12][13][14][15]. Assim, o primeiro traço a ser definido foi o que não teria nenhuma incorporação de material argiloso, representando o traço 0%.…”

Section: Dosagem Dos Traçosunclassified

Estudo Do Balanceamento Estequiométrico Para Otimização De Argamassas De Revestimento

Azevedo¹,

Monteiro²,

Santos³

2017

Anais Do Congresso Anual Da ABM

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Resumo As primeiras argamassas utilizadas em construções pelo homem continham em sua composição, materiais argilosos. Porém, por ser um material com muitas cargas elétricas livres, as argilas reagem constantemente com a água, ocasionando grande variação linear que acaba causando fissuração nas argamassas feitas com esse material. Assim, para solucionar esse problema, passou-se a utilizar cal hidratada no lugar dos materiais argilosos. Dessa maneira, mesmo não sendo composta por argila, a argamassa mantém sua trabalhabilidade. Nesse cenário, o presente trabalho teve como objetivo balancear estequiometricamente a cal hidratada e as argilas estudadas, para utilizar essas quantidades em argamassas para revestimento, barateando assim o material. Para encontrar esse balanceamento estequiométrico calculou-se a massa molar para um mol de cal hidratada e para um mol teórico de argila. Assim foram estipuladas algumas proporções possíveis de balanceamento da equação de reação cal+argila. Além disso, foram confeccionados corpos de prova, variando as quantidades de argila e cal, para realização de ensaios de capilaridade, a fim de comprovar a eficácia dos resultados encontrados no balanceamento teórico.

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“…Malinowski (19) studied the Caesarea Roman aqueduct and states that some type of oil was added as recommended by Vitruvius. A recent study enabled the detection of linseed oil in the mortar beneath the mosaics of the vaults of Saint Peter's Basilica that was also cited in ancient recipes related to the construction of the basilica (20).The fatty acids derivatives as a hydrophonic agents change the surface tension in pores and cracks, which limits water permeation (18,21,22). The chemical structure and properties of fatty acids make them suitable for addition to concrete.…”

Section: Introductionmentioning

confidence: 99%

The fatty acids based organofunctional silane protective coatings for concrete

Szubert

2021

materconstrucc

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The possibility of using free fatty acids for the synthesis of new organofunctional silanes is shown. In nature, fatty acids occur in the form of esters with glycerin (fats) and are widely used for production of soap, oil paints, medicines and cosmetics. Of particular interest in this study was the application of organosilicon derivatives of oleic acid for production of coating that would cover the surface of concrete and protect it from water permeation. As a result of proposed silanization, the concrete surface acquired hydrophobic character with the wetting angles up to 115°, and the concrete absorbability was reduced by up to 93%.

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Effect of fatty acid soap on microstructure of lime-cement mortar

Cited by 35 publications

References 13 publications

Geopolymer foams obtained by the saponification/peroxide/gelcasting combined route using different soap foam precursors

Geopolymer foams obtained by the saponification/peroxide/gelcasting combined route using different soap foam precursors

Estudo Do Balanceamento Estequiométrico Para Otimização De Argamassas De Revestimento

The fatty acids based organofunctional silane protective coatings for concrete

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