Influence of casting conditions on durability and structural performance of HPC-AR : optimization of self-consolidating concrete to guarantee homogeneity during casting of long structural elements : final report.
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2017-05-01
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Abstract:This report is a summary of the research done on dynamic segregation of self-consolidating concrete (SCC) including the casting of pre-stressed beams at Coreslab Structures. SCC is a highly flowable concrete that spreads into place with little to no mechanical vibration [1]. The high fluidity of the concrete is achieved by the addition of special construction chemicals, called superplasticizers. One of the main challenges for SCC is to combine the high flowability and passing ability with stability: the concrete must remain homogeneous during production, transport and placement. Settling of the aggregates or rising of cement paste or bleeding water could lead to inferior properties in parts of the structure [2]. Segregation can be static when the mixture separates at rest, or dynamic, when the aggregates sink during flow.
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