Forensic Investigation of AC and PCC Pavements with Extended Service Life : Volume 3 : Petrographic Examination of Blast Furnace Slag Aggregate Concrete Cores taken from PCC Pavements in Cuyahoga County , Ohio : Executive Summary Report
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2010-09-01
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Edition:Executive summary report.
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Abstract:Air-cooled blast furnace slag has been used as a coarse
aggregate in portland cement-based pavement concretes
since at least the early 1900’s. Many of these concretes
have performed satisfactorily. In recent times a number
of PCC slag aggregate pavements constructed in
Michigan in the early 1990’s have shown extensive
cracking and joint deterioration after only ten years or so
of service. The nature of this pavement distress is
described as being unique to the slag aggregate
concretes. This situation prompted a number of field
and laboratory studies, which are cited in the present
report. Currently there is an on-going FHWA study of
this distress issue.
Four slag aggregate concrete pavements in District 12
(Cleveland) of the ODOT system currently show
evidence of the same type of unique distress. Cores
taken from these pavements were petrographically
examined in Phase 3 of the present Forensic
Investigation. The findings are of direct value to ODOT
and provide additional input and insights for the FHWA
study.
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