FIFTEEN-YEAR REPORT ON EXPERIMENTAL CONCRETE PAVEMENT PROJECT IN OREGON

THE LOMBARD STREET-KILLINGSWORTH STREET SECTION OF THE NORTHEAST PORTLAND SECONDARY HIGHWAY WAS PAVED WITH CONCRETE IN 1941. THE PAVEMENT WAS AN EXPERIMENTAL PROJECT IN WHICH FACILITIES WERE PROVIDED FOR MEASURING CHANGES IN EXPANSION AND CONTRACTION JOINT OPENINGS AND FOR COMPARING THE PERFORMANCE OF THE JOINTS IN SECTIONS VARYING FROM 120 FT TO 1 MI IN LENGTH BETWEEN JOINTS. SOME JOINTS, BOTH EXPANSION AND CONTRACTION, HAD LOAD-TRANSFER DOWELS AND SOME WERE WITHOUT DOWELS. TWO SECTIONS OF REINFORCED CONRETE WERE INCLUDED. MEASUREMENTS OF JOINT OPENING WERE MADE AT LEAST TWICE EACH YEAR FOR 10 YEARS AND FINAL SETS OF MEASUREMENTS WERE MADE AT MIDSUMMER AND MIDWINTER OF 1956 WHEN THE PAVEMENT WAS 15 YEARS OLD. EACH LANE OF THE PAVEMENT HAS BEEN SUBJECTED TO APPROXIMATELY 20,000,000 VEHICLE LOADINGS IN ITS 15 YR. LIFE. THE ONLY EVIDENCE OF SERIOUS DETERIORATION IS LONGITUDINAL CRACKING AT 40 PERCENT OF THE EXPANSION JOINTS AND AT 5 PERCENT OF THE CONTRACTION JOINTS. LONGITUDINAL CRACKING WAS ALSO MORE THAN TWICE AS PREVALENT AT THE CONTRACTION JOINT ADJACENT TO AN EXPANSION JOINT THAN AT THE INTERIOR CONTRACTION JOINTS. INDICATIONS ARE THAT THE WIDER THE JOINT OPENING THE GREATER THE TENDENCY TO CRACK. THE CONCLUSION IS REACHED THAT THE CRACKING IS PROBABLY DUE TO THE HEAVY LOADING AND LACK OF LOAD TRANSFER ACROSS THE JOINTS. THERE IS NO EVIDENCE OF DISTRESS DUE TO LACK OF EXPANSION ROOM IN THE INTERIOR OF THE MILE-LONG SECTION AND THE CONCLUSION IS REACHED THAT, UNDER CONDITIONS EXISTING IN WESTERN OREGON, EXPANSION JOINTS CAN BE ELIMINATED. /AUTHOR/

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  • Accession Number: 00207010
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Apr 28 1994 12:00AM