Los educadores responsables de la asignatura Emprendimiento y Gestión tienen responsabilidad directa incluir estrategias metodológicas alternativas que se alineen con el emprendimiento social orientado al desarrollo mentalidad empresarial o emprendedora del alumnado bachillerato. En esta óptica obtuvo punto vista 17 docentes según encuesta aplicada. También incluyó investigación descriptiva, bibliográfica campo. Entre los resultados mayor consistencia: Existe relación entre empresarial; .la...

The cracks in concrete serve as pathways for aggressive agents, leading to deterioration. One approach addressing these and enhancing structures durability is the use of self-healing such bacteria used heal cementitious matrices. Bacteria can be found several environments, their identification healing viability must evaluated prior In this study, distinct indigenous were collected from soil industrial yards associated with cement industry. These identified incorporated mortar mixtures 18%...

Abstract Precast concrete structures may be affected by delayed ettringite formation (DEF) if an improper curing method is used. DEF can lead to cracking and a reduction in the concrete's strength, which, event of fire, decrease structure's fire resistance duration. Given that, both occurrence scenarios, microstructural changes are primary causes alterations mechanical properties, this study evaluated mineralogical induced exposure high temperatures mortars with potential DEF. To accomplish...

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Diagnosing and understanding the properties of concrete structures allows its use in more effective ways that neither compromise application nor impose safety risks or waste materials. Several tests can be performed for this purpose, differing with regards to diagnostic precision, complexity execution, costs, need specific apparatus, others. Specifications from standards must followed assure durability structures, such as Eurocode 1 (EN 1992‐1) EN 206 Europe. This study determined volume...

Abstract The fiber‐reinforced self‐compacting concrete (FR‐SCC) is considered a high‐performance material, clustering characteristics of SCC combined with steel fibers. This paper assessed fresh and hardened state properties reference FR‐SCC fibers three types quantities reinforcement, totalizing 10 mixtures. Fresh the mixture were evaluated through tests slump‐flow, flow rate, filling ability, plastic viscosity by V‐funnel, passing ability J‐ring L‐box; comprised compressive strength,...

This article evaluated mechanical behavior of ultra-high performance concrete (UHPC) reinforced with hybrid steel and polypropylene fibers, cement consumption 250 kg/m³ application confining pressure in fresh state. The consistency the mixture was analyzed, as well properties compressive strength, flexural strength toughness. percentages hybridization were 50 to 100% metal fibers 0 50% fibers. Results showed that composite 180 MPa (26100 psi), despite its low (2.08 lb/gal), 80% 20%...

Abstract The incorporation of fibers on cement composites reduces its fragility, turning it a ductile material. amount and distribution presents large influence the composite performance, especially by fact that is self-consolidating, which facilitates fiber distribution. 3D microtomography an efficient tool for determining distribution, generating images creating representation in three dimensions sample. Moreover, scanning electron microscopy (SEM) can be used to analyze interaction with...

This study assesses the ballistic impact strength of thin plates made ultra-high-performance concrete (UHPC) with low cement content (250 kg/m3) and volumes 80% steel 20% polypropylene (PP) hybrid fibers. The were prepared thicknesses 30, 50, 70 mm fiber volume ratios 1.5% 3.0%. Compressive strength, flexural tensile residual determined using experimental methods. Test results showed that regardless content, UHPC specimens fibers similar performance against impact, exerting relatively energy...

Reactive powder concrete (RPC) is one type of advanced cementitious composite that has been increasingly used. Its high mechanical strength enables the application in bolder structures. Considering its recent history use, there a lack knowledge about this materials durability. Therefore, paper aimed to evaluate behavior hybrid fiber reinforced RPC under accelerated testing, evaluating different combinations. Composites contained metallic microfibers and polypropylene fibers following...

a superfície (CARASEK, 2011).Entretanto, para que o sistema possa atender essas funções de forma eficaz é necessário dimensioná-lo acordo com cada situação,

Resumo Percebe-se uma maior preocupação com o desempenho das edificações habitacionais após a publicação da NBR 15575 (ABNT, 2013a), tornando indispensável avaliação e possível adequação de sistemas construtivos seus materiais para atendimento dos requisitos. Dentre as imposições relativas à habitabilidade, encontra-se acústico, imprescindível na concepção projetos em ambientes urbanos, dadas inúmeras fontes sonoras potentes existentes. O objetivo deste artigo foi verificar influência...

Los requisitos de confort y habitabilidad visan la calidad viviendas, afectada por los contrapisos. Así, este estudio objetiva diseñar losas hormigón ligero con el uso etileno-acetato vinilo (EVA) como agregados en contrapisos, sustituyendo naturales El programa experimental está compuesto cuatro mezclas, que se modifica relación entre grandes e pequeños EVA naturales. Las contrapiso tienen espesuras 3, 5 7 cm, losa 3 cm tuvo 1 adicional, argamasa, simulando acabamiento. Fueron realizados...

Masonry has been widely used as a construction method. However, there is lack of information on its fire behavior due to the multitude variables that could influence this This paper aimed identify loading and mortar coating thickness masonry. Hence, six masonries made clay tiles laid with were evaluated. The had 25 mm face not exposed high temperatures, while fire-exposed thicknesses 0, 15, mm. For each thickness, two specimens tested, without 10 tf/m. real-scale subjected standard ISO 834...

This work presents results of the first study variation by exposure to high temperatures from two stay-in-place polyvinyl chloride (SIP-PVC) formwork concrete exposed ISO 834 fire curve. A systematic sampling based on proximity and spalling was carried out microstructural, thermal, crystallographic spectroscopic changes were studied according degree affectation using SEM, TGA-DTA, XRD FTIR. The response temperature microstructure SIP-PVC after established experimental results. Results show a...

de CO 2 e a perda água via transpiração).Desta forma, é responsável pela eficiência do processo fotossintético consequentemente da produção vegetal.

Abstract Bacterial solutions have been studied to promote self-healing of cementitious matrices, however, the concentration this varied between studies. Consequently, objective study was evaluate potential different concentrations Bacillus subtilis AP91 encapsulated in expanded perlite (EP). Visual examination and capillary absorption water measured over time. Test samples were also subjected strength resistance tests. The physiochemical properties EP his distribution on matrix evaluated....

Construction defects, even visually untraceable, can forfeit the acoustic performance of systems. The execution systems is a parameter that hard to control. This article aims evaluate construction defects. Wall system samples real proportions were made with induced In comparison reference, reductions 1 dB found for defective gaps above wall and 2 trials no vertical filling. Regarding installations, this reduction reached 3 installation electrical junction boxes at same face two on each face,...

The improvement of acoustic performance construction systems is crucial. flaws found during the design a building are often related to lack data that characterize materials used. Floor slab one influence performance, out which composite slabs made ribs and hollow bricks show up as common alternatives. this specific material not entirely known, considering multitude coatings can be added. Therefore, study compared measurements on impact sound pressure level for one-way rib brick using...

abstract: Investigating the behavior of self-healing cementitious composites is necessary to know alternatives that can be applied in structures increasing their life service. Therefore, this study evaluated concrete self-he aling from use expanded perlite (EP) and clay (EC) capsules impregnated with a sodium metasilicate solution. These materials were used substitute natural aggregates proportions 0 wt·%, 15 wt·% 30 which cured humid or submerged environments. Cracking was induced flexural...