Abstracts
Transverse Crack Propagation of JPCP as Related to
By Staton, John
Michigan Department of Transportation
425 W Ottawa St
Lansing, MI 48909
PH: 517-373-2090
FAX: N/A
E-Mail: STATONJ@mdot.state.mi.us
Problem Statement
The major purpose of this study was to determine the effects of coarse aggregate type and maximum particle size on crack resistance of PCC using notched beam tests and the load transfer characteristics of cracks in JPCP's using a newly developed large-scale laboratory slab testing system.
Research Objectives
N/A
Research Method
N/A
Product
Findings from this study showed that significant in long-term pavement performance associated with aggregate interlock can be expected for JPCP when using durable and strong coarse aggregates with larger maximum size coarse aggregate. These benefits, however, are especially pronounced in long slabs where the cracks widths of up to 2 mm can be expected. Concrete slabs containing large strong (LA abrasion of 22 percent) coarse aggregates reported excellent load transfer properties for all crack widths tested (0.3 mm to 2.5 mm) and any number of repeated cycles (300,000 cycles per crack width). Concrete slabs containing soft, or soft and large aggregates with LA abrasion values of 34 and 43 percent were found to be unsuitable in terms of maintaining load transfer for crack widths exceeding 0.9 mm. The draft final report has been submitted to the TAG and is currently being reviewed.
Completion Date: Dec 31, 2002
Category: Materials
Keywords: coarse aggregate, concrete, crack resistance, jointed, JPCP, pavement, PCC, performance,
Date Posted: Nov 13, 2001
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