SciELO - Scientific Electronic Library Online

 
vol.4 issue3Study of the compressive strength of concrete block prisms: stack and running bondEnvironmental variables in the concrete saturation degree modelling author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Revista IBRACON de Estruturas e Materiais

On-line version ISSN 1983-4195

Rev. IBRACON Estrut. Mater. vol.4 no.3 São Paulo Aug. 2011

http://dx.doi.org/10.1590/S1983-41952011000300003 

Performance evaluation of mechanical properties of self-compacting concrete prepared with different cements types submitted to steam curing

 

 

L.F.SantosI; M.P.BarbosaII

IUniversidade Estadual Paulista, Departamento de Engenharia Civil, liaengenhariacivil@hotmail.com, Rua 33 n° 256, CEP: 15385-000, Ilha Solteira-SP, Brasil
IIUniversidade Estadual Paulista, Departamento de Engenharia Civil, mbarbosa@dec.feis.unesp.br, Alameda Bahia n° 550, CEP: 15385-000, Ilha Solteira-SP, Brasil

 

 


ABSTRACT

Steam curing is one of the mechanisms used in the precast industry to accelerate the strength gain of structural elements. The values of temperature and time of ideal cures for this strength gain vary with the cement and mix design used in concrete. Little is known about the behavior of self-compacting concrete (SCC) when subjected to the steam accelerated curing process, especially with regards to its mechanical properties. This article evaluates the compressive strength of two mixture designs of self-compacting concrete class 40 MPa with two different cements, cement CP III 40-RS and CP II E-32 submitted to normal curing (I accordance with NBR 5738:2003 [2] and to steam curing. Two different steam curing temperatures were used, at 65°C and 80°C and three curing cycles, 4 h, 6 h and 8 h. The study was done at the Laboratory of Civil Engineering CESP - LCEC – Ilha Solteira/SP, where concretes with specimen cylinders of 10 cm x 20 cm were tested. The compressive strengths were obtained at the end of the steam curing plateau (called immediate strength to the cycle) and at ages 3, 7, 28, 56 and 91 days (called strength at advanced ages) and for concrete subjected to normal curing, the ages of rupture were performed at 3, 7, 28, 56 and 91 days. An analysis of the correlation was performed between the values of rupture of the concrete subjected to normal cure, with the values of immediate strength to the cycle and also to the strength at advanced ages. The benchmarks were performed according to the type of cement used, curing temperature and time in the steam curing plateau. Overall, the results show that the concrete with cement CP II E-32 at 65 ºC, for the steam curing plateau of 4 hours, was the best compressive strength value when subjected to these curing conditions, while the concrete with cement CP III 40-RS at 65 °C, for 6 hours of steam curing plateau, was the optimum strength value.

Keywords: self-compacting concrete, compressive strength, steam curing, curing temperature, isothermal plateau.


 

 

Texto completo disponivel apenas em PDF.

Full text avaliable only in PDF format.

 

 

REFERENCES

[01] NUNES, S. C. B. Betão auto-compactável: Tecnologia e propriedades. Pós-graduação em Estruturas de Engenharia Civil – Faculdade de Engenharia, Universidade do Porto, 198p, 2001.         [ Links ]

[02] ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS - ABNT. Concreto – Moldagem e cura de corpos-de-prova cilíndricos ou prismáticos de concreto. NBR 5738. Rio de Janeiro, 2003.6p        [ Links ]

[03] ABNT. Cimento Portland Composto. - NBR 11578, Rio de Janeiro, 1991.         [ Links ]

[04] ABNT. Cimento Potland de alto-forno. NBR 5735. Rio de Janeiro, 1991.         [ Links ]

[05] OKAMURA, H. Self-Compacting High-Performance Concrete. Concrete International, Vol. 19, No. 7, pp. 50-54, 1997.         [ Links ]

[06] WÜSTHOLZ, T. Fresh Proprieties of self-compacting concrete (SCC). Otto-Graf-Journal. Vol. 14. p 179-188, 2003.         [ Links ]

[07] ABNT. Concreto auto-adensável. NBR15823. Rio de Janeiro, 2010.         [ Links ]

[08] ALENCAR, R.S.A. Dosagem do concreto auto-adensável: produção de pré-fabricados. Dissertação de mestrado, Universidade de São Paulo. 179p. São Paulo,2008.         [ Links ]

[09] TUTIKIAN, B. F. Métodos para dosagem de concretos auto-adensáveis. Dissertação de Mestrado. Universidade Federal do Rio Grande do Sul, 148p, 2004.         [ Links ]

[10] MELO, K.A.. Contribuição à dosagem de concreto auto-adensável com adição de filer calcário. Dissertação de mestrado, UFSC, Florianópolis, SC. 180p, 2005.         [ Links ]

[11] ASAGA, K.; ISHIZAKI, M.; TAKAHAGH, S.; KONISH, K; TSURUMI, T.; DAIMON, M. effect of curing temperature on the hydration of portland cement compounds. in: 9th international conference on computer communication, 1992. Deli. Anais. Deli: ICCC, 1992.         [ Links ]

[12] CAMARINI, G. Desempenho de misturas cimento Portland e escória de alto-forno submetidas à cura térmica. Tese de Doutorado – Escola Politécnica, Universidade de São Paulo, São Paulo. 252 p,1995.         [ Links ]

[13] EL DEBS, M. K. Concreto pré-moldado: fundamentos e aplicações. São Carlos: EESC – USP. 456p, 2000.         [ Links ]

[14] AMERICAN CONCRETE INSTITUTE (ACI). Accelerated curing of concrete at atmospheric pressure-state of the art. ACI 517.2 R-87, Manual of Concrete, 1992.         [ Links ]

[15] TÜRKEL, S.; ALABAS, V. The effect of excessive steam curing on Portland composite cement concrete. Cement and Concrete Research, vol.35, p. 405-411, 2005.         [ Links ]

[16] ABNT. Agregado graúdo – Determinação de massa específica, massa específica aparente e absorção de água. NBR NM 53. Rio deJaneiro, 2003.         [ Links ]

[17] ASOCIACIÓN MERCOSUR DE NORMALIZACIÓN - AMN. NM 248: Agregados - Determinação da composição granulométrica. Rio de Janeiro: ABNT, 2001. 6 p.         [ Links ]

[18] TAYLOR, H. F. W. Cement Chemistry. Academic Press Ltd. London, 1990.         [ Links ]

[19] SANTOS, L.F. A influência do patamar de cura térmica sobre a resistência dos concretos auto-adensáveis elaborados com diferentes tipos de cimento: avaliação pelo método da maturidade. Dissertação de mestrado, UNESP, Ilha Solteira, SP. 279p, 2010.         [ Links ]

 

 

Received: 29 Mar 2010
Accepted: 24 Apr 2011
Available Online: 19 Aug 2011

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License