ACCELERATED ASR TESTING OF FIELD CORES AND RECYCLED CONCRETE

The Alkali Silica Reactivity (ASR) of field pavement cores and recycled concrete aggregate (RCA) was investigated using techniques and procedures to accelerate the standard ASTM C 1260 and ASTM C 1293 tests normally utilized to evaluate conventional aggregate. Applying DC current accelerated the field cores, which were stored at standard ASTM C 1293 testing conditions. Laboratory RCA concrete testing included evaluating prisms and cubes with and without holes added to increase the surface to volume ratios and variable moisture storage conditions such as placing the specimens in evacuated bags with surface water. Standard 280 mm (11 in) prisms with 76.2 mm (3 in) faces, cast with four 6.35 mm (0.25 in) parallel longitudinal holes were shown to not only accelerate ASR but also to lower the coefficient of variation of the expansion data. The expansions of concrete 76.2 mm (3 in) cubes were found to be much higher than standard prisms at any given time. Standard concrete prisms were compared to the modified versions of the standard tests. Modified versions of ASTM C 1260 and ASTM C 1293 were found to effectively accelerate ASR.

• Supplemental Notes:
  • Full conference proceedings available on CD-ROM.
• Corporate Authors:

  University of Texas, Austin

  International Center for Aggregates Research, 3208 Red River
  Austin, TX  United States  78705-2650

  Texas A&M University, College Station

  Faculty Exchange Box H
  College Station, TX  United States  77843
• Authors:
  • Gress, D L
  • Kozikowski, R L
  • Scott, H
• Conference:
  • International Center for Aggregates Research 9th Annual Symposium: Aggregates - Concrete, Bases and Fines
  • Location: Austin, Texas
  • Date: 2001-4-22 to 2001-4-25
• Publication Date: 2001

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: 25p

Subject/Index Terms

• TRT Terms: Accelerated tests; Alkali silica reactions; Concrete aggregates; Cubes; Expansion; Laboratory tests; Prisms; Recycled materials
• Subject Areas: Geotechnology; Highways; Materials; I32: Concrete; I36: Aggregates;

Filing Info

• Accession Number: 00983568
• Record Type: Publication
• Report/Paper Numbers: Final Draft
• Files: TRIS
• Created Date: Dec 24 2004 12:00AM