Influence of curing conditions on the mechanical and hydric performance of air-lime mortars with nano-Ca(OH)2 and nano-SiO2 additions

Barbero–Barrera, María del Mar; Gomez-Villalba, L. S.; Ergenç, Duygu; Sierra-Fernández, Aránzazu; Fort, Rafael

doi:10.1016/j.cemconcomp.2022.104631

Cited by 10 publications

(7 citation statements)

References 67 publications

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“…The portlandite (CH) content can also decrease due to carbonation caused by exposure to CO 2 and hu-midity in the aging environment of cement products. Equation 3 indicates, in a summarized and non-stoichiometric way, how the portlandite carbonation process occurs (49,50).…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

Influence of chemical pretreatment on the pozzolanicity of recycled glass microparticles used as a substitute for Portland cement

Barros Correia,

Campos dos Santos,

Bomfim Fraga

et al. 2024

Mater. constr.

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This research investigated the influence of using chemically treated glass microparticles as a partial replacement for cement in Portland cement pastes and mortars. The microparticles were obtained by grinding glass waste into three different particle size fractions (< 75 µm, < 45 µm, and < 25 µm), treated with calcium hydroxide (CH), and characterized using SEM/EDS and a laser particle size analyzer. Samples prepared with the incorporation of glass were characterized using XRD, TGA/DTG, and SEM/EDS. The pretreatment with calcium hydroxide induced the formation of C-S-H with different morphologies on the surface of the particles, in addition to causing changes in particle size distribution due to the formation of agglomerates. The pastes prepared with treated particles had lower amounts of CH and higher levels of hydrated silicates. However, when indirectly measuring the pozzolanicity of treated particles through the compressive strength of mortars, no significant differences were observed in the strengths of mortars made with treated and untreated particles.

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Section: X-ray Diffraction Analysismentioning

confidence: 99%

Influence of chemical pretreatment on the pozzolanicity of recycled glass microparticles used as a substitute for Portland cement

Barros Correia,

Campos dos Santos,

Bomfim Fraga

et al. 2024

Mater. constr.

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“…From this moment, the new stage of nanotechnology came to solve the problems in diverse fields. The construction field saw the opportunity to include nanomaterials for coatings isolative [132] and in the design of cement [133,134], concrete [135,136], or mortars [137][138][139] to improve their specific properties. Nanomaterials also began to apply to soundproof surfaces [140,141], thermal insulators [142], inhibitor coatings against corrosion [143], or salt attacks [144].…”

Section: Background Of the Nanotechnology In Cultural Heritage Conser...mentioning

confidence: 99%

Application of Inorganic Nanomaterials in Cultural Heritage Conservation, Risk of Toxicity, and Preventive Measures

2023

Self Cite

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Nanotechnology has allowed for significant progress in architectural, artistic, archaeological, or museum heritage conservation for repairing and preventing damages produced by deterioration agents (weathering, contaminants, or biological actions). This review analyzes the current treatments using nanomaterials, including consolidants, biocides, hydrophobic protectives, mechanical resistance improvers, flame-retardants, and multifunctional nanocomposites. Unfortunately, nanomaterials can affect human and animal health, altering the environment. Right now, it is a priority to stop to analyze its advantages and disadvantages. Therefore, the aims are to raise awareness about the nanotoxicity risks during handling and the subsequent environmental exposure to all those directly or indirectly involved in conservation processes. It reports the human–body interaction mechanisms and provides guidelines for preventing or controlling its toxicity, mentioning the current toxicity research of main compounds and emphasizing the need to provide more information about morphological, structural, and specific features that ultimately contribute to understanding their toxicity. It provides information about the current documents of international organizations (European Commission, NIOSH, OECD, Countries Normative) about worker protection, isolation, laboratory ventilation control, and debris management. Furthermore, it reports the qualitative risk assessment methods, management strategies, dose control, and focus/receptor relationship, besides the latest trends of using nanomaterials in masks and gas emissions control devices, discussing their risk of toxicity.

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“…They can react with Ca(OH) 2 formed during the hydration process of cement to form a network of interwoven calcium silicate hydrate gel (C-S-H), improving the interface defects of cement-based materials. 31,32 Nanoparticles can also produce anchoring effect at the cement matrix interface. The reflection and hindering effect of nanoparticles on the expansion of microcracks generated in the cement matrix consume energy, thereby limiting crack growth and extension, and improving the fracture toughness of cement-based materials.…”

Section: Introductionmentioning

confidence: 99%

Nano silica grafted on modified polyacrylonitrile fiber improves the interfacial strength of fiber‐reinforced concrete

Wei,

Xu,

Wang

et al. 2024

J of Applied Polymer Sci

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Cement is known to be brittle and usually reinforced with fibers. However, there is a lack of effective chemical bonding between organic fibers and inorganic cement, resulting in a weaker interfacial bonding strength. In this paper, amino hyperbranched polymer (HBP) was used to modify the surface of polyacrylonitrile (PAN) fibers, and then silica nanoparticles (SiO2 NPs) were grafted on the surface of modified PAN fibers to realize the inorganic treatment of organic fibers. The modified PAN fibers applied to cement concrete can significantly enhance the interfacial strength between the fibers and cement. The morphology and chemical composition of the modified PAN fibers were characterized by scanning electron microscope, atomic force microscope, electron energy dispersive spectroscopy, and Fourier transform infrared spectroscopy, and the influence of grafting conditions on grafting effect was analyzed. The results show that SiO2 NPs were evenly distributed on the surface of PAN fiber. When SiO2 NPs concentration was 4%, grafting temperature was 50°C, and grafting time was 4 h, the grafting degree of SiO2 NPs grafted PAN fiber can reach to 1.4%. After coating with SiO2 NPs, the pullout bonding strength of the PAN fiber was increased from 5.5 to 6.5 cN.

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Influence of curing conditions on the mechanical and hydric performance of air-lime mortars with nano-Ca(OH)2 and nano-SiO2 additions

Cited by 10 publications

References 67 publications

Influence of chemical pretreatment on the pozzolanicity of recycled glass microparticles used as a substitute for Portland cement

Influence of chemical pretreatment on the pozzolanicity of recycled glass microparticles used as a substitute for Portland cement

Application of Inorganic Nanomaterials in Cultural Heritage Conservation, Risk of Toxicity, and Preventive Measures

Nano silica grafted on modified polyacrylonitrile fiber improves the interfacial strength of fiber‐reinforced concrete

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