PIT-RUN GRAVEL FOR RAILWAY BALLAST-GOST 7394-70. OFFICIAL PUBLICATION

GRAVII KAR'ERNYI DLIA BALLASTNOGO SLOIA ZHELEZNODOROZHNOGO PUTI-GOST 7394-70. IZDANIE OFITSIAL'NOE

The Standard deals with pit-run gravel, which is a natural pebbly-gravel-sand mixture originating as results of natural disintegration of rock. Its use is controlled by active standards (SN and P), and by the "Conclusions on conducting planned-and-preventive maintenance of the upper track structure, earthen roadbed, and artificial structures of USSR Railroads". Technical specifications provide for the number of 0.1 to 3 mm quartz grains to be not less than 50% of the mass. The amount of soft rock grains in the gravel cannot exceed 15%. The coefficient of permeability is determined according to Appendix 2, and the details of the testing instrument are presented. The calculation of contents (in %) of grains of different sizes in the ballast is made by different formulae for grains over 100 mm; from 100 to 60 mm; from 60 to 3 mm; from 3 to 0.1 mm, and for less than 0.1 mm. A description is given for the calculation of percentage contents of clayey particles, which should not exceed 0.5 to 1%. Rules of acceptance, testing methods and transportation and storing procedures are described.

• Supplemental Notes:
  • Abstract only is available in English, original untranslated as of December 1976.
• Corporate Authors:

  USSR Council of Ministers for Constr Matters

  Moscow,   USSR 
• Publication Date: 1970

Language

• Russian

Media Info

• Features: Appendices; Figures; Tables;
• Pagination: 10 p.

Subject/Index Terms

• TRT Terms: Aggregates; Ballast (Railroads); Gravel; Specifications; Tests
• Old TRIS Terms: Ballast specifications
• Subject Areas: Geotechnology; Railroads;

Filing Info

• Accession Number: 00144468
• Record Type: Publication
• Files: TRIS
• Created Date: Feb 16 1977 12:00AM