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- W165360785 abstract "Segregation of hot mix asphalt is a recurring problem in the paving industry. There is little documented research that quantifies the effect of segregation on mix properties and pavement performance. Many state highway agencies are embracing performance based quality control/quality assurance (QC/QA) programs but only a few states have performed studies to quantify the effect of segregation on pavement performance. This study was conducted on four newly constructed pavements which had noticeable spots of segregation. Cores were obtained from both segregated and non-segregated sections of the four pavements. The unit weights of the pavements were determined using a thin-lift nuclear gauge. The change in gradation on the 4.75 mm sieve was compared with asphalt content, nuclear gauge unit weight, core unit weight, and macro texture to determine if an indicator test could quantify segregation. The cores were tested for moisture sensitivity, fatigue life, and indirect tensile strength to determine the effect of segregation on performance. The results indicated that asphalt content was the best indicator of segregation and macro texture the best nondestructive indicator of segregation. Core unit weight is the best indicator test to predict pavement performance. Based on the gradations, asphalt contents, and VTM (percent compaction) of the field cores, four levels of segregation were defined. The pavement materials (asphalt cement and aggregates) used in the construction of two of the four pavements were obtained and laboratory samples were prepared to simulate the four levels of segregation obtained from field cores. The laboratory samples were tested to evaluate the effects of segregation on mix properties and performance. The results of this study indicate that segregation causes a drop in unit weight, indirect tensile strength, moisture resistance, and fatigue life, as well as an increase in permeability of asphalt mixes. The coarse-graded mix was more affected by segregation than the mix with a gradation closer to the maximum density line." @default.
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- W165360785 date "1998-01-01" @default.
- W165360785 modified "2023-09-26" @default.
- W165360785 title "EFFECTS OF SEGREGATION ON MIX PROPERTIES OF HOT MIX ASPHALT" @default.
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