Final Report: Self-Consolidating Concrete Construction for Modular Units

Gentry, Russell¹  Kahn, Lawrence¹  Kurtis, Kimberly¹  Petrovic, Bojan¹  Loreto, Giovanni¹  Van Wyk, Jurie²  Canterero-Leal, Carlos² 

[1] Georgia Inst. of Technology, Atlanta, GA (United States);Westinghouse Inc., Cranberry Township, PA (United States)

关键词: self-consolidating concrete;    cold-joints;    steel composite construction;    shear-friction in concrete;   

DOI  :  10.2172/1297823
RP-ID  :  DOE-GeorgiaTech--667-1
PID  :  OSTI ID: 1297823

美国|英语

来源: SciTech Connect

【 摘 要 】

This report focuses on work completed on DE-NE0000667, Self-Consolidating Concrete for Modular Units, in connection with the Department of Energy Nuclear Energy Enabling Technologies (DOE-NEET) program. This project was completed in the School of Civil and Environmental Engineering at the Georgia Institute of Technology, with Westinghouse Corporation as the industrial partner. The primary objective of this project was to develop self-consolidating concrete (also termed ???self-compacting concrete??? or SCC) mixtures so that concrete placement can be made into steel plate composite (SC) modular structures without the need for continuous concrete placement. As part of the research, SCC mixtures were developed and validated to ensure sufficient shear capacity across cold-joints, while minimizing shrinkage and temperature increase during curing to enhance concrete bonding with the steel plate construction found in modular units. The SCC mixtures developed were able to carry shearing forces across the cold-joint boundaries. This ???self-roughening??? was achieved by adding a tailored fraction of lightweight aggregate (LWA) to the concrete mix, some of which raised to the surface during curing, forming a rough surface on which subsequent concrete placements were made. The self-roughening behavior was validated through three sets of structural tests. Shear friction on small-scale specimens with cold joints was assessed using varying fractions of LWA and with varying amounts of external steel plate reinforcement. The results show that the shear friction coefficient, to be used with the provisions of ACI 318-14, Section 22.9, can be taken as 1.35. Mid-scale beam tests were completed to assess the cold-joint capacity in both in-plane and out-of-plane bending. The results showed that the self-roughened joints performed as well as monolithic joints. The final assessment was a full-scale test using a steel composite module supplied by Westinghouse and similar in construction to the steel composite modules being assembled at the Vogtle and V.C. Summer plant expansions. The final test showed that the roughened cold-joint showed excellent shear and flexural capacity, and substantial ductility, when used in conjunction with steel composite construction.