SCC and conventional concrete on site: property assessment

Caracterização das propriedades do betão em elementos produzidos com BAC e betão convencional

SCC and conventional concrete on site: property assessment

Caracterização das propriedades do betão em elementos produzidos com BAC e betão convencional

S. Nunes^I; H. Figueiras^II; J. Sousa coutinho^III; J. Figueiras^IV

^ILABEST, Faculty of Civil Engineering, Porto University, [e-mail], Rua Dr. Roberto Frias, 4200-465 Porto, Portugal, Fax [phone]

^IILABEST, Faculty of Civil Engineering, Porto University, [e-mail], Rua Dr. Roberto Frias, 4200-465 Porto, Portugal

^IIILABEST, Faculty of Civil Engineering, Porto University, [e-mail], Rua Dr. Roberto Frias, 4200-465 Porto, Portugal

^IVLABEST, Faculty of Civil Engineering, Porto University, [e-mail], Rua Dr. Roberto Frias, 4200-465 Porto, Portugal

ABSTRACT

The present paper deals with comparing properties of hardened SCC cast during first full-scale tests in a precast factory and similar conventional concrete currently used in the same factory. The main goal was to evaluate viability of replacing the C45/55 conventional concrete, in use at the precast factory, by a SCC of the same class of resistance and maintaining the constituent materials. A wide number of specimens (cubes, cylinders, prisms) and full size precast elements were cast with both SCC and conventional vibrated concrete to enable comparing different properties of both types of hardened concrete. In order to implement SCC in this precast factory, suitability of actual current processes involved in production, mixing, transport and placing had to be evaluated. SCC exhibited improved mechanical behavior, higher resistance to fluid ingress and a more uniform strength along the full-size element due to a combination of proper mixdesign together with controlled mixing and placing on site.

Keywords: Self-compacting concrete (SCC); conventional concrete; precast industry; mechanical properties; durability.

RESUMO

O presente artigo apresenta uma comparação das propriedades do betão endurecido em elementos produzidos com betão auto-compactável (BAC) e betão convencional durante ensaios à escala real levados a cabo numa fábrica de pré-fabricação. O principal objectivo deste estudo consistiu em avaliar a viabilidade da substituição do betão convencional C45/55, em uso na fábrica de pré-fabricação, por um BAC da mesma classe de resistência e mantendo os mesmos materiais constituintes. Durante os ensaios à escala real foram betonados diversos provetes (cubos, cilindros e prismas) e elementos pré-fabricados com ambos os tipos de betões destinados à caracterização do betão endurecido. Tendo em vista a aplicação do BAC nesta fábrica de pré-fabricação avaliou-se ainda a adequabilidade dos processos correntes envolvidos na produção, amassadura e transporte do betão. O BAC apresentou um comportamento mecânico melhorado, maior resistência ao ingresso de fluídos e uma distribuição mais uniforme da resistência ao longo dos elementos pré-fabricados, o que resultou da combinação de uma composição adequada com o controle dos processos de amassadura e colocação do betão.

Palavras-chave: Betão auto-compactável (BAC); betão convencional; indústria de pré-fabricação; propriedades mecânicas; durabilidade

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Received 26/11/2007

Accepted 27/02/2009

Available Online 03/04/2009

Publication Dates

• Publication in this collection
  18 Sept 2014
• Date of issue
  Mar 2009

History

• Received
  26 Nov 2007
• Accepted
  27 Feb 2009