Incorporação de ar em materiais cimentícios aplicados em construção civil.

Romano, Roberto

doi:10.11606/t.3.2013.tde-27122013-113747

Cited by 21 publications

(35 citation statements)

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“…With respect to the hydration stabilizing admixture for stabilized mortars, Campos (2012) and other authors such as Pivetta et al (2016) and Ruppenthal and Pelisser (2012) found an increase in the initial setting time as the admixture content increased. Also, for the same admixture content, storage time did not influence the initial setting time (RUPPENTHAL; PELISSER, 2012).…”

Section: Introductionmentioning

confidence: 92%

Influence of cement type and water content on the fresh state properties of ready mix mortar

et al. 2018

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The main characteristic of ready mix mortar is to remain workable for up to 72hours after mixing. This greater duration of workability is obtained by use of hydration stabilizing admixtures and air-entrained admixtures. Thus, the behavior of this mortar depends on the compatibility between Portland cement and these two admixtures. Within this context, the objective of this article is to evaluate the influence of Portland cement type and water content on the properties of ready mix mortars in fresh state. Three types of Portland cement and four water/dry material ratios were evaluated. The produced mortars were analyzed with respect to their properties in fresh state: consistency index, specific gravity, air entrained content and rheological behavior by squeeze-flow. The properties were determined for three storage durations (0, 24 and 48 hours). The results show that both types of cement (mainly, the rheological behavior) and water content (mainly, the air entrained content, consistency and rheological behavior) influenced the ready mix mortar properties. Therefore, these two parameters must be evaluated for mortar dosages in order to obtain the required properties in fresh state.

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Section: Introductionmentioning

confidence: 92%

Influence of cement type and water content on the fresh state properties of ready mix mortar

et al. 2018

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“…Determinada a partir da técnica de vacuum-decay (TORRENT, 1992;TORRENT;FRENZER, 1995;ROMANO, 2013). O aparato utilizado consiste em uma bomba de vácuo acoplada a uma câmara de sucção que fica em contato com a superfície da amostra.…”

Section: Permeabilidade Ao Arunclassified

“…Mantém-se o vácuo por 30 s, desligado em seguida, monitorando-se a queda de pressão em função do tempo. A permeabilidade ao ar (expressa somente em valores de k1 -constante de permeabilidade darcyana) é calculada a partir da Equação 8, de Forchheimer (INNOCENTINI et al, 2009;ROMANO, 2013), considerando para efeito de simplificação duas hipóteses: compressibilidade desprezível do gás e utilização apenas do termo linear. …”

Section: Permeabilidade Ao Arunclassified

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Efeito da variação do consumo de cimento em argamassas de revestimento produzidas com base nos conceitos de mobilidade e empacotamento de partículas

et al. 2018

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Resumoredução do consumo de cimento na composição de argamassas de revestimento é uma alternativa para a diminuição do impacto ambiental provocado na cadeia de produção do ligante. A utilização de materiais cimentícios suplementares (supplementary cementitious materials -SCM) e a dosagem com base nos conceitos de empacotamento e mobilidade de partículas são estratégias que podem resultar nas propriedades projetadas tanto no estado fresco quanto endurecido. O objetivo deste trabalho foi ilustrar a influência da alteração no consumo de ligante nas propriedades no estado fresco e endurecido de argamassas de revestimento mantendo-se constante a distribuição de tamanho de partículas, o que resultou em porosidade de empacotamento com insignificante variação. O consumo de cimento variou de 8% a 16% em massa, com adição de filler calcário como SCM, sendo que a consistência foi a mesma devido à alteração dos teores de água nas argamassas. Os resultados indicaram que a redução no consumo de cimento afeta negativamente as propriedades no estado endurecido, mas ainda assim atendem às exigências estabelecidas para esse tipo de revestimento. Palavras-chave:

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“…O método permite comparar a reatividade dos cimentos na presença dos finos, podendo conter cimento anidro e aditivos dispersantes (ROMANO et al, 2013).…”

Section: Calorimetriaunclassified

Reaproveitamento de lamas residuais do processo de fabricação do concreto.

Silva¹

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Nowadays, one of the biggest problems of a central concrete batching are the concrete waste leftovers returning from work generating decanted sludge with high pH characterizing it as hazardous waste and representing high spending allocation. The purpose of this study aims to study in detail the composition of the sludge from the concrete manufacturing process, checking what is the influence of its addition in concrete.With this, we intend to study some forms of treatment and its reuse economically viable to replace the fine aggregate. For this study two samples that were collected cementitious material, being collected directly from one settling tank and collected in the second washing of the own mixer trucks. They were subjected to characterization tests such as thermogravimetric analysis (TG), laser granulometry calorimetry and fresh concrete test (rheology and chilling) and hardened concrete. For economic feasibility was carried out a case study in three metering stations of concrete, in order to identify material losses, disposal costs and variable costs in the manufacture of concrete. The results showed that the form of collection of cementitious materials influences the fineness of the material as particle size and bulk density test, but it was not possible to obtain anhydrous cement.The possibility of using sludge in concrete was possible with the help of superplasticizers additives, but for the economical feasibility of the production chain concrete studied it a great replacement content of the mud by the fine aggregate.

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Incorporação de ar em materiais cimentícios aplicados em construção civil.

Cited by 21 publications

References 0 publications

Influence of cement type and water content on the fresh state properties of ready mix mortar

Influence of cement type and water content on the fresh state properties of ready mix mortar

Efeito da variação do consumo de cimento em argamassas de revestimento produzidas com base nos conceitos de mobilidade e empacotamento de partículas

Reaproveitamento de lamas residuais do processo de fabricação do concreto.

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