TEXTURING OF CONCRETE PAVEMENT

PRELIMINARY WORK BY CALIFORNIA ON TEXTURING OF CONCRETE PAVEMENTS IS DESCRIBED. THE PROBLEM HAS RESOLVED INTO TWO GENERAL AREAS: SECURING ADEQUATE TEXTURE DURING CONSTRUCTION, AND MAINTAINING TEXTURE, AS BUILT, BY USING MATERIALS AND CONSTRUCTION PRACTICES THAT INSURE DURABLE SURFACE MORTAR. VARIOUS TEXTURE PATTERNS WERE FORMED INTO THE SURFACE OF LABORATORY-CAST SLABS USING A VARIETY OF PROTOTYPE DEVICES. SKID TESTS WERE PERFORMED ON THESE SLABS. A PROMISING PATTERN WAS SELECTED AND USED ON SHORT SECTIONS OF THREE FREEWAYS. SOME OF THE RESULTS WERE DISAPPOINTING. A UNIFORM TEXTURE OVER A LARGE AREA COULD NOT BE ACHIEVED BECAUSE OF VARYING MORTAR PROPERTIES. IT WAS ALSO DISCOVERED THAT THE PATTERN SELECTED, WHEN FORMED TOO DEEPLY, CAUSED AN ADVERSE REACTION BY SOME VEHICLES. ADDITIONAL WORK IS PLANNED USING OTHER TEXTURE PATTERNS. OTHER SURFACE TREATMENTS INCLUDED BROADCASTING OF SLAG AND SELECTED COARSE SAND PARTICLES ON THE SURFACE WHILE DRAGGING WITH BURLAPS, AND BROOMING. SKID TESTS ARE BEING PERFORMED ON A PERIODIC BASIS, BUT IT IS TOO SOON TO DRAW CONCLUSIONS REGARDING THE LONG-TERM SKID RESISTANCE AS AFFECTED BY TRAFFIC AND WEATHER. NEW CURING COMPOUNDS AND SO-CALLED SURFACE HARDENERS WERE APPLIED TO SHORT TEST SECTIONS OF FREEWAYS IN AN ATTEMPT TO IMPROVE MORTAR DURABILITY. LABORATORY TESTS PREVIOUSLY PERFORMED INDICATED THAT SOME IMPROVEMENT COULD BE EXPECTED FROM THE USE OF BETTER CURING COMPOUNDS AND HARDENERS. AGAIN, THESE TEST SECTIONS HAVE NOT BEEN IN SERVICE LONG ENOUGH TO FORM ANY CONCLUSIONS REGARDING THEIR EFFECTIVENESS. PLANNED FUTURE WORK INCLUDES A CONTINUATION OF TEXTURING STUDIES, A SEARCH FOR EFFECTIVE SURFACE TREATMENTS, A STUDY OF FIELD PRACTICES THAT AFFECT SURFACE MORTAR QUALITY AND TEXTURE, AND ADDITIONAL WORK ON GROOVING OF OLDER PAVEMENTS TO OBTAIN OR RESTORE ADEQUATE SKID RESISTANCE. SPECIFICATIONS WILL BE DEVELOPED AS WORK PROGRESSES TO IMPROVE CHARACTER AND DURABILITY OF THE SURFACE TEXTURE. /AUTHOR/

Media Info

  • Pagination: p. 100-103
  • Monograph Title: Control of pavement slipperiness: asphalt pavement cracking
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00215187
  • Record Type: Publication
  • Report/Paper Numbers: HS-005 952
  • Files: HSL, TRIS, TRB
  • Created Date: Jul 28 2001 12:00AM