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151. Self-compacting concrete - A labor cost evaluation when used to replace traditional concrete in building construction



Title: 151. Self-compacting concrete - A labor cost evaluation when used to replace traditional concrete in building construction
Author(s): W.L. Repette
Paper category : conference
Book title: 5th International RILEM Symposium on Self-Compacting Concrete
Editor(s): G. De Schutter and V. Boel
Print-ISBN: 978-2-35158-047-9
e-ISBN: 978-2-35158-088-2
Publisher: RILEM Publications SARL
Publication year: 2007
Pages: 1001 - 1006
Total Pages: 6
Nb references: 3
Language: English


Abstract: Newly developed methods of proportioning have elevated the composition of Self-Compacting Concrete (SCC) into the range of normal strength, making it a potentially competitive material for current applications. This article presents an evaluation of the use of SCC in a conventional concrete structure where the main objective was to quantify a reduction in labor cost by replacing traditional concrete with SCC. The applications of SCC and ordinary concrete were monitored during the construction of two consecutive floors, one using SCC and the other with ordinary concrete. Beams and composite precast beam-hollow ceramic brick slabs were cast jointly. Total floor area was 504 m2. The system or formwork materials were identical for both SCC and ordinary concrete. The entire process was recorded by uninterrupted filming. The videos were carefully analyzed, aiding in the conclusions of this research and revealing that labor productivity is considerably higher during the application of SCC. The productivity depends mainly on the type of placing equipment employed.
Conversely, the placing of normal concrete is a labor intensive operation, and if the placing rate is to be increased, the labor force must be significantly increased and in accordance with the type of placing equipment. The placing rate of high fluidity SCC (slump flow higher than 750mm) proved to be about the same as that of low fluidity SCC (slump flow less than 650mm). Low fluidity SCC was easier to apply and control at the job site.


Online publication: 2009-06-16
Publication type : full_text
Public price (Euros): 0.00