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.
- Abstract only is available in English, original untranslated as of December 1976.
USSR Council of Ministers for Constr MattersMoscow, USSR
- Publication Date: 1970
- Features: Appendices; Figures; Tables;
- Pagination: 10 p.
- TRT Terms: Aggregates; Ballast (Railroads); Gravel; Specifications; Tests
- Old TRIS Terms: Ballast specifications
- Subject Areas: Geotechnology; Railroads;
- Accession Number: 00144468
- Record Type: Publication
- Files: TRIS
- Created Date: Feb 16 1977 12:00AM