00727306

Component

https://doi.org/10.1177/0361198196152500110

https://scholar.google.co...erke&publication_year=1996

Many early Iowa portland cement concrete (PCC) pavements provided good performance without deterioration for more than 50 years. In the late 1950s, Iowa was faced with severe PCC pavement deterioration called D-cracking due to crushed limestone containing a bad pore system. Selective quarrying solved the problem. In 1990, cracking deterioration was identified on a 3-year-old US-20 pavement in central Iowa. The coarse aggregate was a crushed limestone with an excellent history of performance in PCC pavement. Examination of cores showed very few cracks through the coarse aggregate particles. The cracks were predominately confined to the matrix. A high-resolution, low-vacuum Hitachi scanning electron microscope with an energy dispersion detector was used to investigate the deterioration. Subsequent evaluation identified a very small concentration of silica gel (silicon) but substantial amounts of sulfur and aluminum (assumed to be ettringite) in the air voids. Some of these voids have cracks radiating from them leading to the conclusion that the ettringite in the voids, after being subjected to sodium chloride brine, initially swelled and then dissolved. The research has indicated that the premature deterioration may be due to ettringite and may have been mistakenly identified as alkali-silica reactivity.

This paper appears in Transportation Research Record No. 1525, Rigid Pavement Design and Rehabilitation Issues.

English

p. 91-96

1996

Transportation Research Record

0309062233

Figures (11) ; Photos (2) ; References (11) ; Tables (2)

Concrete pavements; Core samples; Cracking; Crushed limestone; Deterioration; Electron microscopy; Energy transfer; Ettringite; Sodium chloride; Swelling; Void ratios

Scanning electron microscopy; Voids

Iowa

Iowa

Design; Energy; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces

TRIS, TRB

Oct 18 1996 12:00AM

• ANALYSIS OF CURRENT STATE RIGID PAVEMENT DESIGN PRACTICES IN THE UNITED STATES
• CASE STUDY OF OVERLAY PERFORMANCE ON RIGID PAVEMENT IN BOWIE COUNTY, TEXAS
• CORNER STRESS ANALYSIS OF JOINTED CONCRETE PAVEMENTS
• CURLING STRESS EQUATION FOR TRANSVERSE JOINT EDGE OF A CONCRETE PAVEMENT SLAB BASED ON FINITE-ELEMENT METHOD ANALYSIS
• DEVELOPMENT OF DOWEL LOOSENESS PREDICTION MODEL FOR JOINTED CONCRETE PAVEMENTS
• DEVELOPMENT OF JOINTED CONCRETE PAVEMENT DATABASE FOR STATE OF TEXAS
• EVALUATION OF AASHTO RIGID PAVEMENT DESIGN MODEL USING LONG-TERM PAVEMENT PERFORMANCE DATA BASE
• FACTORS AFFECTING JOINT EFFICIENCY OF ROLLER-COMPACTED CONCRETE PAVEMENT JOINTS AND CRACKS
• LOAD TRANSFER CHARACTERISTICS OF ROLLER-COMPACTED CONCRETE PAVEMENT JOINTS AND CRACKS
• LONG-TERM PERFORMANCE OF RECYCLED PORTLAND CEMENT CONCRETE PAVEMENT
• METHODOLOGY FOR ESTIMATING REMAINING LIFE OF CONTINUOUSLY REINFORCED CONCRETE PAVEMENTS
• NEW PROCEDURE FOR EVALUATING BOND STRENGTH OF CONCRETE REINFORCEMENT
• WESTERGAARD-TYPE SOLUTION FOR EDGE LOAD TRANSFER PROBLEM