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原文传递 Influence of Mixing Procedure on Robustness of Self-Consolidating Concrete.

题名：	Influence of Mixing Procedure on Robustness of Self-Consolidating Concrete.
作者：	Asghari, A.; De Schutter, G.; Feys, D.; Ghafari, E.; Hernandez, A. M. L.; Van Der Vurst, F.
关键词：	Concretes; Measurements; Mixing Procedures; Mixtures; Portland Cement; Rheology; Robustness; Self-consolidating Concrete; Shear Rates; Slumps; Test Equipment; Transportation Infrastructure; Trends; Wo
摘要：	Self-Consolidating Concrete is, in the fresh state, more sensitive to small variations in the constituent elements and the mixing procedure compared to Conventional Vibrated Concrete. Several studies have been performed recently to identify robustness of SCC and to develop solutions to increase the robustness of SCC. Ghent University obtained a major research project from the Research Foundation in Flanders (FWO) to investigate fundamentally robustness of SCC and to identify potential solutions in the form of alternative materials to enhance robustness. In the present research project, Missouri S&T extended the research at Ghent University by investigating the influence of the mixing procedure on the robustness of SCC. The project was split into four tasks. In a first task, the sequence of adding the constituent elements and mixing was investigated by measuring the rheological properties of cement pastes. In a second task, the combined influence of the most significant mix design and mixing procedure parameters were investigated, with particular attention to the mix design parameters which influence the robustness of the cement paste to a change in time of addition of the superplasticizer. In the third task, the results obtained on cement pastes were validated on concrete scale, with focus on the adding sequence of the aggregates and their initial moisture content. In the fourth task, the robustness of thixotropy and loss of workability was investigated on cement paste and concrete scale. To enhance the application of SCC for the construction and repair of transportation infrastructure, two key concepts are of importance: quality control and consistency. The consistency refers to the mixing operations and transportation of SCC. It is recommended to keep the mixing procedure constant for every SCC produced. This includes the addition sequence of the materials, the mixing time, the mixing speed and the concrete volume (parameter not tested, but it is reflected in mixi
报告类型：	科技报告