Dispersive clays experience deflocculation in the presence of somewhat clean still water and are extremely vulnerable to erosion. Lime or Portland cement usage is one of the most applied methods to amend such adverse characteristics and enhance mechanical properties. Present research is aimed at a single power function quantifying the effect of amounts of binder, porosity, and curing period in the assessment of unconfined compressive strength (qu) of dispersive clay–binder mixtures. Analysing qu results, it was found that a ratio between porosity and binder volumetric content controls the strength of blends. The qu values of the specimens moulded for each binder type were also normalized (i.e., divided by the qu attained at a specific porosity/binder ratio) reaching a single power function quantifying the influence of the binder’s amount, porosity, and curing time. From a pragmatic standpoint, this denotes that carrying out only one unconfined compression test with a specimen moulded with a specific binder, porosity, and cured for a given time period allows to determine an equation that controls the strength for a whole range of porosities and binder contents. The developed normalization was successfully extended to other fine-grained soils treated with cement, lime, and even pozzolan–lime, considering longer curing periods.
RESUMOEste ar#go apresenta o estudo realizado com mistura de Reclaimed Asphalt Pavement (RAP) e pó de pedra com cimento Portland. Foram realizados ensaios para verificar o comportamento da mistura quanto à rigidez, de modo que possibilitou avaliar a influên-cia do processo de cimentação e dos esforços de compactação, nas propriedades elás#-cas e viscoelás#cas lineares da mistura cimentada. Os resultados indicaram que há um aumento da rigidez nos três teores de cimento estudados (3, 5 e 7%), bem como um aumento nos pesos específicos aparentes secos (2,0, 2,1 e 2,2 g/cm³). Pode-se -afirmar que estas misturas têm propriedades viscoelás#cas provenientes da herança do ligante asfál#co presente no material fresado. Por fim, este trabalho demonstra que se deve ter cautela ao projetar pavimentos analisando apenas o material como puramente elás#co, pois percebemos que há variação do módulo em relação à temperatura e à frequências de carregamento. ABSTRACTThis paper presents a study of a mixture of Reclaimed Asphalt Pavement (RAP) with powdered rock and Portland cement. Tests were performed to verify the behavior of the mixture regarding the s#ffness characteris#cs, so it was possible to evaluate the influence of cementa#on process and compac#on efforts on the elas#c and viscoelas#c proper#es of the cemented mixture. The results showed that there is an increment in material s#ffness for the three studied cement mixes (3, 5 and 7%) as well as an increment in the apparent specific dry weights (2,0, 2,1 and 2,2 g/cm³). It can be demonstrated that these mixes have viscoelas#c proper#es derived from asphalt binder present in the RAP. Lastly, this paper shows that should be careful with the designing pavements considering the material as only elas#c, since it's clear the material s#ffness dependency of temperature and load frequency. Palavras-chaves:Material fresado asfál#co, Viscoelas#cidade, Rigidez. Keywords:Reclaimed Asphalt Pavement, Viscoelas#c, S#ffness. DOI:10.14295/transportes.v26i1.1342 INTRODUÇÃOA implantação e manutenção de infraestrutura rodoviária é um dos fatores indutores do desenvolvimento econômico e social. Pavimentos asfálticos saõ a maioria no cenaŕio da pavimentaçaõ brasileira, utilizando o concreto asfaĺtico tanto em obras de implantação quanto manutenção. Estima-se que mais de 90% das rodovias pavimentadas nacionais são de concreto asfáltico (ABEDA, 2011) e tem o objetivo de proporcionar aos usuaŕios segurança e conforto durante o tráfego, aleḿ de durabilidade e resistencia às cargas que lhes são impostas (Mendes e Marques, 2012).Entretanto, diferente de outras obras de Engenharia, obras de infraestrutura rodoviária tem ciclo de vida curto, entre 6 e 30 anos, o que demanda atençaõ constante aos serviços de manutenção (conservação e reabilitação) (Papagiannakis e Massad, 2008;Medina e Motta, 2015; Pires et al., 2016).Uma das formas para a correção dos defeitos dos pavimentos e o reestabelecimento de uma superfıćie de rolamento suave e segura é a restauração, sendo bastante empregada at...
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