Excess paste method to formulate a self-compacting concrete

Abdelkader Mebrouki, Karim Bendani, Nasreddine Bouhamou, Nadia Belas


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Abstract


On the basis of the principle that a concrete is composed of a liquid phase (paste) and a solid phase (aggregates with fixed gravel/sand ratio), the concrete self-compacting properties come necessarily from those of the paste. The present work is the continuity of a first phase of the testing already conducted, which resulted in obtaining an optimal self-compacting cement paste composition. This paste will be used to prepare a self-compacting concrete (SCC), while passing from the scale of the cement paste to that of the concrete, by injecting wet aggregate to the self-compacting paste. The excess paste theory was used to determine the thickness of the paste coating each aggregate with a given diameter of constituting granular skeleton, then generalized for the determination of the quantity of total paste allowing the flow of the concrete by decreasing frictions between the grains of its granular skeleton. This approach was also experimentally validated. The influence of the granular distribution was minimized by the use of the approach based on the determination of the average diameter of the aggregates. This required the determination of a homothetic factor “k” similar for all concretes with different aggregate grading. Formulation of a self-compacting concrete passes initially by the determination of a sufficient quantity of paste allowing its flow without frictions between its aggregates and to balance the mixture by the quantity of water retained by the aggregates. The self-compacting concrete characteristics would come from those of the cement paste which composes it.

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References


AFGC, Association Française de Génie Civil (2008). Recommendations for use of self-Compacting Concrete. Scientific and technical documents, P N B@P.

Bui VK, Akkaya Y, Shah S P (2002). Rheological model for self-consolidating concrete. ACI Mater J, 99: 549-59.

El-Barrak M, Mouret M, Bascoul A (2009). Self-compacting concrete paste: Hierarchical classification of their influence on flow properties of the paste. Cement Concrete Compos 31: 12-21.

Mebrouki A, Belas N, Bouhamou N (2010). Experimental plans method to formulate a self- compacting cement paste. Mater Tehnol, 44:13-20.

Nanthagopalan P, Santhanam M (2010). A simple and systematic mix design procedure for self-compacting concrete. 6th International RILEM Symposium on SCC, Montreal, Canada, pp: 54-63.

Pedersen B, Smeplass S (2003). The relationship between the rheological properties of SCC and the corresponding matrix phase. Proceedings of 3rd RILEM International Symposium on Self Compacting Concrete, Reykjavik, Iceland, pp:106-16.

Wong HHC, Kwan AKH (2008), Packing density of cementitious materials: part 1-measurement using a wet packing method. Mater Struct, 41: 689–701.


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Civil Engineering Researcher Club - University Amar Telidji of Laghouat JBMS@2018.