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Bridge Construction

Manual on Use of Self-Propelled Modular Transporters to Remove and Replace Bridges

Appendix F Example Specification for Lightweight Aggregate

FDOT Standard Specifications

901-4 Lightweight Aggregates.
901-4.1 Lightweight Coarse Aggregate for Bituminous Construction:

Lightweight coarse aggregate may be produced from naturally occurring materials such as pumice, scoria and tuff or from expanded clay, shale or slate fired in a rotary kiln. It shall be reasonably uniform in quality and density, and free of deleterious substances as specified in 901-1.2, except that the term cinders and clinkers shall apply to those particles clearly foreign to the extended aggregate in question.

In addition, it must meet the following specific requirements:

  • Material passing the No. 200 Sieve ...........maximum 3.00%, (FM 1-T 011)
  • Dry loose weight (AASHTO T 19)................33-55 lb/ft3*
  • Los Angeles Abrasion (FM 1-T 096).............maximum 35%
  • Ferric Oxide (ASTM C 641).....................maximum 1.5 mg

*Source shall maintain dry-loose unit weight within +6% of Quality Control average. Point of use dry-loose unit weight shall be within +10% of Source Quality Control average.

901-4.2 Lightweight Coarse Aggregate for Structural Concrete:

The requirements of 901-4.1 are modified as follows:

  • Aggregates shall not be produced from pumice and scoria.
  • Los Angeles Abrasion (FM 1-T 096, Section 12) shall be 45%, maximum.
  • Gradation shall meet the requirements of AASHTO M 195 for 3/4 inch, 1/2 inch and 3/8 inch.
Updated: 08/21/2013
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000