Characteristics of Iowa Fine Aggregate, MLR-92-6, 1996

(1996) Characteristics of Iowa Fine Aggregate, MLR-92-6, 1996. Transportation, Department of


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The objective of this research was to evaluate the quality (angularity, mortar strengths and alkali-silica reactivity) of fine aggregate for Iowa portland cement concrete (PCC) pavements. Sands were obtained from 30 sources representative of fine aggregate across Iowa. The gradation, fineness modulus and mortar strengths were determined for all sands. Angularity was evaluated using a new National Aggregate Association (NAA) flow test. The NAA uncompacted void values are significantly affected by the percent of crushed particles and are a good measure of fine aggregate angularity. The alkali-silica reactivity of Iowa sands was measured by the ASTM P214 test. By P214 many Iowa sands were identified as being reactive while only two were innocuous. More research is needed on P214 because pavement performance history has shown very little alkali-silica reactivity deterioration of pavement. Six of the sands tested by P214 were evaluated using the Canadian Prism Test. None were identified as being reactive by the Canadian Prism Test.

Item Type: Departmental Report
Keywords: Aggregate gradation, Aggregates, Alkali silica reactions, Angularity, Concrete, Fine aggregates, Fineness, Quality control, Sand, Strength of materials, Aggregate analysis, Concrete strength, Quality
Subjects: Transportation
Transportation > Roads and highways
Transportation > Research
ID Code: 16109
Deposited By: Iowa DOT Library
Deposited On: 18 Feb 2014 17:13
Last Modified: 03 Oct 2014 11:59