CONCRETE PAVEMENT SUBBASE STUDY IN OHIO

A 4-MI LENGTH OF CONCRETE SURFACED ARTERIAL HIGHWAY BUILT IN 1952 WAS DESIGNED AS A TEST ROAD WITH SUBBASE TREATMENT AND SLAB LENGTH AS VARIABLES. SUBBASES INCLUDED DENSE-GRADED AND OPEN-TEXTURED CRUSHED STONE 3, 5, AND 8 IN. THICK, CEMENT-TREATED CLAY SOIL 6 IN.THICK, AND CLAY SOIL-CEMENT 3 AND 5 IN. THICK. SLAB LENGTHS WERE 20 FT AND 100 FT. OBSERVATIONS ON PERFORMANCE OF THE ROAD WERE MADE SEVERAL TIMES EACH YEAR FOR FIVE YEARS. THE PERIODIC CONDITIONS SURVEYS WERE SUPPLEMENTED BY MOVING LOAD TESTS TO OBSERVE DIFFERENCES IN DEFLECTIONS AND STRAINS IN THE CONCRETE SLABS AS RELATED TO THE CONTROLLED VARIABLES. AFTER FIVE YEARS OF HEAVY TRAFFIC, IT APPEARS THAT: (1) TEST AREAS WITH SUBBASES WERE BETTER IN OVER-ALL PERFORMANCE THAN THE CONTROL AREAS WITH NO SUBBASE. (2) OPEN-TEXTURED LIMESTONE SUBBASES WITH LONGITUDINAL EDGE DRAINS PREVENTED JOINT AND EDGE PUMPING, AND WERE EFFECTIVE IN THE REDUCTION OF EDGE BLOWING. THICKNESS OF MATERIAL MADE RELATIVELY LITTLE DIFFERENCE IN THE OVER-ALL PERFORMANCE OF THE OPEN-TEXTURED SUBBASES. (3) DENSE-GRADED LIMESTONE SUBBASES RESTRICTED JOINT AND EDGE PUMPING AND EDGE BLOWING. IN THIS RESPECT THE 5-IN. AND 8- IN. THICKNESSES WERE MORE EFFECTIVE THAN THE 3-IN.THICKNESS. THIS WAS ALSO TRUE IN THE RESTRICTION OF DEFLECTIONS UNDER MOVING LOADS. (4) SOIL-CEMENT SUBBASES WERE MADE OF CLAY SOIL AND CEMENT-MODIFIED CLAY SOIL SUBBASES WERE NOT ENTIRELY SUCCESSFUL BECAUSE THE TOP SURFACE OF THESE SUBBASES WAS SUSCEPTIBLE TO EROSION, WHICH RESULTED IN PUMPING AT SLAB EDGES AND TO SOME EXTENT AT JOINTS. MOVING LOAD TESTS, HOWEVER, SHOWED THAT THE AVERAGE RECORD OF THE 5-IN. SOIL-CEMENT SUBBASE, FROM THE STANDPOINT OF RESTRICTING DEFLECTIONS AND STRAINS IN THE PAVEMENT, WAS EQUIVALENT TO OR BETTER THAN THAT OF ALL OTHER SUBBASES. (5) LITTLE OR NO CORRELATION WAS INDICATED BETWEEN EDGE PUMPING AND SLAB CRACKING, AND (6) CONCRETE GUTTERS WERE AN EFFECTIVE MEANS OF PREVENTING EDGE PUMPING AND BLOWING AND GREATLY REDUCED JOINT PUMPING. /AUTHOR/

Language

  • English

Media Info

  • Monograph Title: Performance of granular subbases under concrete
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00232478
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 2004 2:43AM