Fly Ash Affect on Alkali-Aggregate Reactivity, MLR-88-7, 1989

(1989) Fly Ash Affect on Alkali-Aggregate Reactivity, MLR-88-7, 1989. Transportation, Department of


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Cement-aggregate reactions were first reported in the 1940's. Depletion of quality aggregate, changes in cement and the use of fly ash make cement-aggregate reactions a problem still today. This latest research into alkali-aggregate reactivity was initiated to evaluate the new ASTM style test containers and evaluate the effect of Class C fly ash on the expansive reaction. Three aggregates were tested in combination with three cements and three fly ashes available in Iowa. Thirty-six combinations were made and tested over a six-month period. The conclusions were: (1) the new style ASTM containers were much more effective than the containers used by the Iowa DOT in the past; (2) some mixes with 15 percent Class C fly ash had increased expansion over comparative mixes without fly ash; and (3) the Oreapolis #8 pit did not appear to have an alkali-silica reaction problem based on this testing and earlier reported testing.

Item Type: Departmental Report
Keywords: Aggregates, Alkali aggregate reactions, Cement, Fly ash, Testing, Testing equipment
Subjects: Transportation
Transportation > Materials
Transportation > Materials > Gravel and aggregates
Transportation > Roads and highways
Transportation > Research
Transportation > Research > Concrete
ID Code: 17166
Deposited By: Iowa DOT Library
Deposited On: 09 Jun 2014 17:44
Last Modified: 09 Jun 2014 17:44