CRC 85: Interface Shear Transfer of Lightweight Aggregate Concretes with Different Lightweight Aggregates

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Title: CRC 85: Interface Shear Transfer of Lightweight Aggregate Concretes with Different Lightweight Aggregates

Author(s): Lesley H. Sneed, Samantha Wermager, and Kristian Krc

Publication: CRC

Volume:

Issue:

Appears on pages(s):

Keywords:

Date: 5/1/2016

Abstract:
This report presents the results from the second phase of an ongoing investigation of the direct shear transfer across an interface of lightweight aggregate concretes. The lightweight concretes were made with different lightweight aggregate materials (expanded shale, expanded slate, and expanded clay). The second phase of the experimental investigation included 52 push-off specimens. Test variables included concrete type (normalweight, sand-lightweight, or all-lightweight), lightweight aggregate materials, surface preparation of the shear interface, reinforcement ratio, and crack interface condition. Applied shear force-slip relations are presented and discussed. Peak shear strengths are also compared. Current shear-friction design provisions in the ACI 318 code and the PCI Design Handbook are examined. Shear strengths computed using the coefficient of friction μ-approach by the PCI Design Handbook (Equation 5-32a) and the ACI 318 code (Equation 22.9.4.2) and the effective coefficient of friction μe-approach in the PCI Design Handbook (Equation 5-32b) are found to be conservative for the sand-lightweight and all-lightweight monolithic and cold joint specimens in this study.


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