Material and Casting Methodology for SCC and HPC (70 MPa) Concrete Foundation Blocks
Abstract
Material and Casting Methodology for SCC and HPC (70 MPa) Concrete Foundation Blocks
ABSTRACT
The Brookfield Century Plaza Commercial Building, located in Alphaville District, in São Paulo, Brazil, was designed to be supported by two direct foundation concrete blocks. A high strength (70 MPa), self-compacting concrete SCC was developed for these two massive foundation blocks (each one measures 28.4m x 18.6m by 4.5m, high). A numerical model by employing a FEM software was developed to predict the thermal hydration gain of different casting procedures, in order to establish the most appropriate one to meet the construction and schedule requirements without cracks. Directions to control concrete production at mixing plant and placing at construction site were established as well as supervised. Finally, internal concrete temperatures were recorded to enable a better model calibration.
Keywords: High strength concrete, self-compacting concrete, concrete modeling, refrigerated concrete production.
Concreto e Concretagem de Blocos de Fundação em Concreto Autoadensável e de Alta Resistência (70 MPa)
RESUMO
O EdifÃcio Comercial Brookfield Century Plaza, localizado em Alphaville, São Paulo, Brasil, foi projetado para ser apoiado em dois grandes blocos de concreto. Um concreto de alta resistência (70 MPa) e SCC auto adensável foi desenvolvido para estes dois blocos maciços de fundação (cada um medindo 28.4m x 18.6m por 4.5m de altura). Um modelo numérico empregando um software FEM foi desenvolvido para prever o ganho de hidratação térmica de diferentes camadas de concretagem, a fim de estabelecer o procedimento mais adequado para cumprir o cronograma e os requisitos de construção, sem fissurar. Diretrizes para controlar a produção do concreto na empresa de serviços de concretagem e procedimentos de como aplicá-lo no canteiro de obras foram estabelecidas e supervisionadas. Finalmente, as temperaturas internas do concreto foram registradas para permitir uma melhor calibração do modelo.
Palavras-chave: Concreto de alta resistência, concreto auto adensável, modelagem de concreto massa, produção de concreto refrigerado.
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Hormigón y Hormigonado de Cimentación con Hormigón Autocompactante y de Elevadas Prestaciones (70 MPa)
RESUMEN
El Edificio Comercial Brookfield Century Plaza, localizado en Alphaville, São Paulo, Brasil, fue diseñado para ser sostenido por dos grandes bloques de hormigón. Un hormigón de alta resistencia (70 MPa) y SCC auto compactante fue desarrollado para estos dos bloques masivos de fundación (cada un mide 28.4mx 18.6m por 4.5m de altura). Un modelo numérico utilizando un software FEM fue desarrollado para predecir la ganancia térmica de hidratación de diferentes capas de hormigonado con el fin de establecer el procedimiento más adecuado para cumplir con los requisitos de tiempo y de la construcción, sin que aparezcan fisuras. Fueron establecidos y supervisados procedimientos para controlar la producción de concreto en la empresa productora de concretos y aplicarlo en el sitio de construcción. Finalmente, la temperatura interna del concreto se registró para permitir una mejor calibración del modelo.
Palabras clave: concreto de alta resistencia, concreto autocompactante, concreto masivo, producción de concreto refrigerado.
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References
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