Field Observation of Five Lightweight Aggregate Pretensioned Prestressed Bridge Beams, HR-104, 1969

(1969) Field Observation of Five Lightweight Aggregate Pretensioned Prestressed Bridge Beams, HR-104, 1969. Transportation, Department of

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Abstract

The use of lightweight aggregates in pretensioned prestressed concrete beams is becoming more advantageous as our design criteria dictate longer span concrete bridges. Bridge beams of greater lengths have been restricted from travel on many of our highways because the weight of the combined beams and transporting vehicle was excessive, making hauls of any distance prohibitive. This, along with the fact that new safety requirements necessitate the use of longer spans in grade separation structures over major highways, prompted the State of Iowa to investigate the use of lightweight aggregate bridge beams. The objective of this project is the collection of field deflection measurements for five pretensioned prestressed lightweight aggregate concrete bridge beams fabricated by conventional plant processes; also the comparison of the actual cambers and deflections of the beams with that predicted from the design assumptions.

Item Type: Departmental Report
Keywords: Beams, Curvature, Deflection tests, Highway transportation, Lightweight aggregates, Prestressed concrete bridges, Pretensioning
Subjects: Transportation
Transportation > Materials > Gravel and aggregates
Transportation > Research
Transportation > Research > Concrete
Transportation > Law and policies
ID Code: 16994
Deposited By: Iowa DOT Library
Deposited On: 02 Jun 2014 11:55
Last Modified: 18 Sep 2014 15:32
URI: http://publications.iowa.gov/id/eprint/16994