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原文传递 Development of a Guide for Cast-in-Place Applications of Self-Consolidating Concrete.

题名：	Development of a Guide for Cast-in-Place Applications of Self-Consolidating Concrete.
作者：	nowak, a. morcous, g. kaszynska, m. tuan, c. paczkowski, p.
关键词：	quality assurance, mix designs, mixing procedures, field testing methods, troubleshooting, outcomes, nebraska, guides, precast industry
摘要：	The State of Nebraska is one of the national leaders in the application of self-consolidating concrete (SCC) in the precast industry. The main advantages of SCC over conventional concrete are: its ability to fill complex formwork with hard to reach corners, ability to pass through rebar congested areas, and resistance to segregation with no need for mechanical vibration. There is a great need in Nebraska for using SCC in special cast-in-place applications, such as threaded rod bridge deck connections. However, the on-site application of SCC has special requirements that differ from those of precast applications and need to be satisfied to ensure the concrete quality. The objective of this research project is to develop a practical guide for cast-in-place applications of the self-consolidating concrete. The major focus of this guide is to identify SCC mix design, mixing procedures, field testing methods, and troubleshooting steps. The SCC mix is developed using local materials (cement and class F fly ash (1PF), 47B sand and gravel, and 12 limestone) and admixtures currently available in the Nebraska market. Several trial mixes are developed and tested at the University of Nebraska Laboratories to establish the proper mixing procedures and acceptance criteria for testing fresh and hardened SCC properties. Two full-scale field tests are performed to evaluate the impact of the delivery time, concrete temperature, and pouring method on the basic SCC properties. A guide that summarizes the outcomes of the research project is prepared to be used by concrete contractors and quality assurance personnel. / NOTE: Final rept. / Supplementary Notes: See also PB2005-106287. Sponsored by Nebraska State Dept. of Roads, Lincoln. and Department of Transportation, Washington, DC. / Availability Note: Available on CD-ROM and in color paper copy only. Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
总页数：	u0813；78p
报告类型：	科技报告