Silica fume activated by NaOH and KOH in cement mortars: Rheological and mechanical study

Caldas, Pedro Henrique Caetano Hormidas; Azevedo, Afonso Rangel Garcez de; Marvila, Markssuel Teixeira

doi:10.1016/j.conbuildmat.2023.132623

Cited by 16 publications

(3 citation statements)

References 54 publications

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“…The results obtained by the chemical analysis of CPII-E cement indicated the predominance of silica and calcium oxide, a characteristic composition of Portland cement. Other authors also found mainly silica and calcium oxide in CPII-E, being 29.54% and 49.01%, respectively [19].…”

Section: • X-ray Fluorescencementioning

confidence: 87%

Evaluation of Technological Properties of Mortars with the Addition of Plaster Byproduct

Ribeiro,

de Castro Xavier,

da Silva Barroso

et al. 2024

Sustainability

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The incorporation of waste into construction materials is a potential topic for study and is seen as a solution for many industries that face the following impasse: the risk to the environment due to the accumulation of waste in yards. In view of this, during the production of lactic acid, which is widely used in industries, gypsum is produced as a byproduct, yielding one ton for each ton of lactic acid. Aiming at a functional destination for this byproduct, this study proposes its addition in mortars for covering walls and ceilings. The research proposal was a mortar in a 1:6 ratio (cement:sand) with the addition of 0, 3, 6 and 10% of industrial plaster byproduct. The cement used to prepare the mortar was CPII-E32. To characterize the raw materials, scanning electron microscopy, X-ray fluorescence and X-ray diffraction analysis were carried out. To evaluate the properties in the fresh state, a consistency index and mass density and entrained air tests were carried out. In the hardened state, mass density, axial compression strength, flexural tensile strength and water absorption via capillarity were evaluated after 28 days of age. Microstructural characterization techniques were also carried out on the reference mixtures and with 3% addition of the byproduct gypsum, such as scanning electron microscopy and X-ray diffraction. The results showed that the byproduct is hemihydrate and its addition improved the workability of the mortar. Mortars with the addition of byproduct gypsum showed a reduction in mechanical resistance. The most satisfactory results were for the mixes with a 3% addition, indicating greater resistance to axial compression and flexural traction, with 3.90 MPa and 1.14 MPa, respectively.

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Section: • X-ray Fluorescencementioning

confidence: 87%

Evaluation of Technological Properties of Mortars with the Addition of Plaster Byproduct

Ribeiro,

de Castro Xavier,

da Silva Barroso

et al. 2024

Sustainability

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“…The addition of 20% NaOH to the silica fume increased the kinetics of reactions. The mechanical strengths of the materials activated with KOH were higher than those activated with NaOH due to the stronger chemical bonds formed [39].…”

Section: Silica Fumementioning

confidence: 91%

“…For example, ordinary Portland cement (OPC) can be used as a source of calcium in the alkaline activation of silica fume. In order to improve the physical and mechanical properties of mortar cement, Caldas and collaborators [39] carried out a study in which they added silica fume to OPC as a pozzolanic additive. The addition of NaOH and KOH had the role of ensuring a combined mechanism of alkaline activation in the silica fume.…”

Section: Silica Fumementioning

confidence: 99%

The Precursors Used for Developing Geopolymer Composites for Circular Economy—A Review

Furtos,

Prodan,

Sarosi

et al. 2024

Materials

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Considering recent climate changes, special importance is given to any attempt to depollute and protect the environment. A circular economy seems to be the ideal solution for the valorization of mineral waste, resulting from various industrial branches, by reintroducing them in the process of obtaining alternative building materials, more friendly to the environment. Geopolymers can be considered as a promising option compared to Portland cement. Information about the influence of the composition of the precursors, the influence of the activation system on the mechanical properties or the setting time could lead to the anticipation of new formulations of geopolymers or to the improvement of some of their properties. Reinforcement components, different polymers and expansion agents can positively or negatively influence the properties of geopolymers in the short or long term.

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Geopolymer concrete containing nanomaterials—a step toward sustainable construction

Indwar,

Mishra,

Titiksh

2024

Environ Sci Pollut Res

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Silica fume activated by NaOH and KOH in cement mortars: Rheological and mechanical study

Cited by 16 publications

References 54 publications

Evaluation of Technological Properties of Mortars with the Addition of Plaster Byproduct

Evaluation of Technological Properties of Mortars with the Addition of Plaster Byproduct

The Precursors Used for Developing Geopolymer Composites for Circular Economy—A Review

Geopolymer concrete containing nanomaterials—a step toward sustainable construction

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