Mechanical Properties and Durability of Concrete Pavements Containing High Volumes of Fly Ash


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Title: Mechanical Properties and Durability of Concrete Pavements Containing High Volumes of Fly Ash

Author(s): T. R. Naik, R. N. Kraus, B. W. Ramme, and R. Siddique

Publication: Special Publication

Volume: 212


Appears on pages(s): 319-340

Keywords: chloride-ion penetration; compressive strength; concrete; flexural strength; fly ash; pavement; salt-scaling resistance; splitting-tensile strength

Date: 6/1/2003

This investigation was undertaken to examine the performance characteristics of concrete pavements made with high volumes of Class F and Class C fly ash. Three mixture proportions with Class C fly ash up to 70% cement replacement, and three mixtures with Class F fly ash up to 67% cement replacement, were used in this study. Tests were conducted for compressive strength, resistance to chloride-ion penetration, and density using specimens from in-situ pavements. Test results indicate better pozzolanic strength contribution and higher resistance to chloride-ion penetration for concrete mixtures made with Class F fly ash relative to that made with Class C fly ash. Compressive strengths of core specimens taken from in-situ pavements ranged between 45 to 57 MPa. The maximum compressive strength 57 MPa was achieved after 7 years, for the mixture containing 67% Class F fly ash. Field observations made in the year 2000, and continuing observations through April 2002 revealed that pavement sections made with high-volume of Class F fly ash (35 to 67%) performed well in the field, with only minor surface scaling. All other pavement sections have experienced very little surface damage due to the scaling. Field performance data versus laboratory evaluation data for scaling are presented.