Concrete compaction is one of the indispensable fundamentals of concrete manufacturing. However, thorough compaction cannot always be insured. This can be wholly or partially encountered in congested sections, out-of reach deep foundations and narrow or irregular precast components. On the other hand, typical vibrators were considered as contributor to health hazards to workers. Self-compacting concrete (SCC) is an emerging concrete where the cohesive yet flowable consistency of the concrete itself secures adequate placement with high level of homogeneity and little or no segregation. Such concrete is primarily achieved by incorporating admixtures that is referred to as viscosity modifying (VM) admixtures with no vibration. Yet, the impact of mix proportions and the role played by the VM admixtures as opposed to superplasticizers (SP) or other admixtures is not clearly understood. In addition, there seems to be no unique means for assessment of such concrete and the correlation between various test methods is not well established. This study aims at achieving better understanding of the influence of mix parameters including the dosage of VM and SP on the properties of SCC. A review of literature was conducted with an emphasis on literature pertinent to the scope of this study. Twenty-six mixtures were prepared with various water-to-cement ratio (w/c), fine-to coarse aggregate ratio and VM and SP dosages. An experimental program involving new test techniques was designed to assess the performance of SCC in the fresh and hardened state. This includes the slump flow, L-box, U-box, hardened density, compressive and flexural strength as well as Schmidt Rebound Hammer. Means to assess hardened density and segregation were implemented through sectioning of column specimens. The results of this work reveal that thorough and homogenous compaction can be realized by employing self-compacting concrete without neither external nor internal compaction. A good performance is witnessed when incorporating VM admixtures that can not be matched by the conventional superplasticizer admixtures. Evidence is shown that the dosage impact of VM is more significant on mixtures made with w/c = 0.3 mixtures than mixtures of w/c = 0.4. Incorporating higher fine-to-coarse aggregates ratio seem to decrease flow capacity and velocity yet it yields higher resistance to segregation. The superior performance of VM mixtures is supported by less segregation and more consistent mechanical properties and less variation in its density within the sections of SCC components. Tests methods such as the Schmidt hammer should not be applied to SCC unless re-calibration and interpretation of its readings is adopted. Further research work is needed particularly in the domain of SCC durability and long-term performance. Recommendation is provided to include SCC in future Egyptian Code of Practice
School of Sciences and Engineering
Interdisciplinary Engineering Program
Date of Award
Online Submission Date
Mohamed Nagib Abou-Zeid
Committee Member 1
Farouk El Hakim
Committee Member 2
Committee Member 3
Library of Congress Subject Heading 1
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(2004).Performance of self-compacting concrete [Thesis, the American University in Cairo]. AUC Knowledge Fountain.
Rushdy, Mohamed Samir. Performance of self-compacting concrete. 2004. American University in Cairo, Thesis. AUC Knowledge Fountain.
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