00210274

Component

http://onlinepubs.trb.org...s/hrr/1965/104/104-008.pdf

THE MATERIALS AND RESEARCH DEPARTMENT OF THE CALIFORNIA DIVISION OF HIGHWAYS HAS BEEN CONDUCTING A RESEARCH STUDY ON THE EXPANSION AND CONTRACTION OF ASPHALT CONCRETE MIXES USING AGGREGATES RANGING FROM NONABSORPTIVE TO HIGHLY ABSORPTIVE. DATA INDICATE THAT AC TEST SPECIMENS FABRICATED FROM ABSORPTIVE AGGREGATES AND EXPOSED TO NORMAL ATMOSPHERIC CONDITIONS ABSORB MOISTURE FROM THE AIR WHICH MAY CAUSE CONSIDERABLE EXPANSION. DURING THE WARMEST HOURS OF THE DAY, THESE EXPANDED SPECIMENS CONTRACT, CAUSING TRANSVERSE OR SO-CALLED BLOCK CRACKING. IDENTICAL SPECIMENS KEPT IN A DRY STORAGE CABINET DID NOT EXHIBIT THIS PHENOMENON. THE TYPE OF CRACKING FOUND IN PAVEMENTS APPEARS THE SAME AS OBSERVED IN LABORATORY SPECIMENS WHEN BOTH ARE FABRICATED FROM THE SAME HIGHLY ABSORPTIVE AGGREGATES. STRAINS CREATED IN PAVEMENT BY THIS CYCLE OF EXPANSION AND CONTRACTION, TOGETHER WITH DEFLECTIONS IMPOSED BY LOADS, MAY CAUSE A SERIOUS REDUCTION IN SERVICE LIFE. THIS STUDY PRESENTS DATA SHOWING THAT EXPANSION CAN BE REDUCED BY CERTAIN MINERAL FILLERS AND INCREASED BY OTHERS. EXPANSION CAN ALSO BE GREATLY REDUCED BY INCREASING THE ASPHALT CONTENT OF THE MIX CONSISTENT WITH OTHER SPECIFICATION REQUIREMENTS. /AUTHOR/

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01410060

pp 141-163

1965

Highway Research Record

Digital/other

Appendices (1) ; Figures (8) ; Photos (19) ; References (9) ; Tables (5)

Absorption; Aggregates; Asphalt concrete; Asphalt content; Bituminous mixtures; Contraction; Expansion; Mineral fillers; Moisture content; Pavement cracking; Reduction (Chemistry); Research

California

California

Geotechnology; Highways; Materials; Research

TRIS, TRB

Sep 29 1994 12:00AM

• A STUDY OF TENACITY OF AGGREGATES IN SURFACE TREATMENTS
• ANALYSIS OF FLEXIBLE PAVING MIXTURES BY THEORETICAL DESIGN PROCEDURE BASED ON SHEAR STRENGTH /WITH DISCUSSION/
• EFFECT OF ASPHALT VISCOSITY ON RHEOLOGICAL PROPERTIES OF BITUMINOUS CONCRETE
• EFFECT OF DEGREE OF AGING ON CREEP AND RELAXATION BEHAVIOR OF SAND-ASPHALT MIXTURES
• EFFECTS OF MINERAL FILLERS IN SLURRY SEAL MIXTURES /WITH DISCUSSION/
• EXPERIENCES WITH GYRATORY TESTING MACHINE
• RELATION OF ASPHALT PAVEMENT VARIABLES TO PERFORMANCE /WITH DISCUSSION/
• VOIDS IN ONE-SIZE SURFACE TREATMENT AGGREGATES AND DISCUSSION