PAVED SHOULDER PROBLEM - STEVENSON EXPRESSWAY

PREMATURE SHOULDER FAILURES MANIFESTED BY HEAVING, LONGITUDINAL AND TRANSVERSE CRACKING, AREA DISTRESS, AND SEPARATION OF PAVEMENT AND SHOULDER ON I-55 NEAR CHICAGO WERE INVESTIGATED. SHOULDERS ON FULL WIDTH (AND ONE TRENCHED) BASES 6 IN. THICK WERE STUDIED OVER A 16 1/2 MILE SECTION OF 6 LANE DIVIDED HIGHWAY BUILT IN 1964. MOST OF THE ROAD IS ON AN EMBANKMENT COMPOSED OF FINE-GRAINED, SWELLING, IMPERMEABLE, FROST SUSCEPTIBLE A-6 AND A-7-6 SOILS. TEN-FOOT WIDE SHOULDERS WERE BUILT ADJACENT TO THE OUTSIDE AND THE MEDIAN LANES AND WERE CONTIGUOUS TO 10 IN. -CRCP OR -SRCP. THE CONDITIONS OF SHOULDERS COMPOSED OF CEMENT-AGGREGATE MIXTURE (CAM), OR POZZOLAN-AGGREGATE (PAM), OR BITUMINOUS (BAM) BASES AND COVERED WITH 2 1/2-IN. OF BIT. CONCRETE WERE COMPARED. AFTER A YEAR, HEAVING OF 1-IN. WAS NOT INFREQUENT. LABORATORY AND FIELD TESTS INDICATED THAT SURFACE WATER CONTAINING DEICING SALT WAS THE SUSPECTED CAUSE OF DAMAGE. IN MANY CASES THE BASE, SUBBASE AND UPPER PORTION OF THE SUBGRADE WERE SATURATED WHEN EXAMINED. HIGH CONCENTRATION OF NA C1 WERE FOUND IN THE DETERIORATED CAM AND PAM. UNDERDRAINS APPEARED TO BE INEFFECTIVE BUT WATER RAN FROM THE SHOULDERS WHEN THEY WERE CUT. BAM SHOWS AS THE ONLY ADEQUATE TYPE OF CONSTRUCTION BUT ONLY 2 SECTIONS WERE EXAMINED AND THE RESULTS ARE, HENCE, SUSPECT. THE FINDINGS ARE LIMITED BECAUSE ADEQUATE KNOWLEDGE ABOUT THE CONSTRUCTION AND ENVIRONMENT CONDITIONS PREVAILING PRIOR TO DISPLACEMENT AND DETERIORATION ARE UNAVAILABLE. ESPECIALLY MISSED ARE THE MOISTURE CONTENTS DURING COMPACTION. RECOMMENDATIONS ARE PRESENTED CONCERNING IMPROVED DRAINAGE, SURFACE SEALING, JOINT AND CRACK SEALING, AND THE USE OF SOILS WHICH ARE MORE RESISTANT TO MOISTURE AND FROST EXPANSION. /BPR/

  • Supplemental Notes:
    • Hpr-1/3/, BPR 4, IHR 6
  • Corporate Authors:

    Illinois Department of Transportation

    Division of Highways, 2300 South Dirksen Parkway
    Springfield, IL  USA  62764
  • Authors:
    • Lacis, J H
  • Publication Date: 1967-7

Subject/Index Terms

Filing Info

  • Accession Number: 00206322
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Apr 12 1994 12:00AM