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RIGID PAVEMENTS - U.S.S.R.

INVESTIGATIONS OF DYNAMIC AND STATIC INTERACTION OF CEMENT CONCRETE PAVEMENTS WITH BASE COURSES OF VARIOUS TYPES ESTABLISHED THAT THE USE OF SOIL-CEMENT BASE COURSES FOR THE CONCRETE PAVEMENTS WAS MOST PRACTICAL. THE STRESSES IN THE CONCRETE OF A PAVEMENT DESIGNED ON A SOIL-CEMENT BASE COURSE ARE FROM 20 TO 30 PERCENT LOWER THAN WITH CRUSHED STONE GRAVEL OR SAND BASE COURSES. THE EMPLOYMENT OF BASE COURSES MADE FROM SAND OR GRAVEL AND CRUSHED STONE IS THEREFORE, LIMITED, DEPENDING ON THE CATEGORY OF THE ROAD, THE COMPOSITION AND DENSITY OF TRAFFIC. PAVEMENT THICKNESS IS SELECTED ACCORDING TO THE RESULTS OF CALCULATIONS FOR SUCH CATEGORY OF ROAD, AND IS CORRECTED WITH A VIEW TO THE COMPOSITION AND DENSITY OF TRAFFIC. THE RELIABILITY AND LONG -SERVICE LIFE OF CONCRETE PAVEMENTS IS INSURED BY PROPER DESIGN OF THE SUB-GRADE, INCREASED SOIL COMPACTION STANDARDS, THE EMPLOYMENT OF FROST-RESISTING COURSES AND STRONGER BASE COURSES. STEEL REINFORCEMENT IN THE FORM OF MATS OR WIRE FABRICS IS EMPLOYED ONLY TO PREVENT THE GREAT OPENING OF RANDOM CRACKS IN THE SLABS, WHOSE LENGTH RANGES FROM 6 TO 8 M. ON SOME TEST ROADS, REINFORCEMENT HAS BEEN USED FOR PURPOSES OF REDUCING SLAB THICKNESS, AS WELL AS FOR CONSTRUCTING JOINTLESS PAVEMENTS. THE SPACING OF THE EXPANSION JOINTS HAS BEEN INCREASED TO 100-150 M DEPENDING ON THE THICKNESS OF THE PAVEMENT, THE TYPE OF BASE COURSE AND THE AIR TEMPERATURE DURING THE CONSTRUCTION PERIOD. THE NUMBER OF DOWELS AND THEIR DIAMETER HAVE BEEN INCREASED ON THE BASIS OF THEORETICAL CALCULATIONS AND EXPERIMENTAL INVESTIGATIONS. JOINTS ARE SEALED WITH RUBBER-BITUMINOUS MASTICS OR COMPOUNDS OF RUBBER AND POLYMER MATERIALS. PRESTRESS METHODS FOR CONCRETE AND ROAD PAVEMENTS ARE BASED ON THE USE OF PIANO WIRE CONCRETE. A CONCRETE PRESTRESS VARYING FROM 8 TO 15 KG/SQ CM IS DEEMED SUFFICIENT FOR HIGHWAY PAVEMENTS, WITH THE TENDONS LOCATED IN THE BOTTON ZONE OF THE SLAB. WITH A PAVEMENT THICKNESS EXCEEDING 14 CM NO PRESTRESSING OF THE CONCRETE IN A LATERAL DIRECTION APPEARS NECESSARY. WITH A VIEW TO INSURING CRACK RESISTANCE OF THE CONCRETE BEFORE THE TENSION OF THE TENDONS IS RELEASED, AND FOR THE USE OF ORDINARY TIRE JOINTS, IT SEEMS TO BE GOOD POLICY TO SET THE LENGTH OF THE SLABS WITHIN 25-50 METERS. A CONCRETE PLACER WITH SLIDING FORMS FOR PLACEMENT WIDTH OF 7.5 M HAS BEEN DESIGNED THAT IS PROVIDED WITH AN AUTOMATIC CONTROL SYSTEM FOR INSURING SMOOTHNESS OF THE PAVEMENT.

  • Supplemental Notes:
    • No Iv-13, pP 2-14, 4 FIG, 4 REF
  • Authors:
    • Zashchepin, A N
  • Publication Date: 1967

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  • Accession Number: 00205548
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 3 1994 12:00AM