Self-consolidating concrete, also known as self-compacting concrete (SCC), is a highly flowable concrete that spreads into place and fills formwork without the need for mechanical vibration. SCC reduces the time and labor cost needed for concrete placement. This study is part of the proposed project by Tennessee Department of Transportation (TDOT) carried out by University of Tennessee at Chattanooga (UTC) to develop four new SCC mixtures (two Class P-SCC (precast) and two Class A-SCC (general use), and insure they meet the minimum strength and durability requirements for TDOT Class P and Class A mixtures. The objectives of the study are to analyze effects of visual stability index (VSI) on both fresh and hardened properties of Class PSCC concrete under the accelerated curing condition. In addition, the relationship between VSI and fresh segregation of SCC is investigated. A total of 24 concrete mixtures varying in VSI values were produced for the study. Different sizes of coarse aggregates materials were used during the mixing process, as well as different kinds of sands. A number of fresh and hardened properties tests were performed on the concrete mixtures to assess the performance of the mixes. The SURE CURE system is used to accelerate the curing process of the concrete. Finally, the results of this study are analyzed according to the coarse aggregate sizes and evaluated to recommend performance specifications for Class P-SCC for TDOT adoption of SCC standard operating procedures of the precast elements.
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