TEMPERATURE CONTROL OF MASS CONCRETE IN JAPAN

THE SCALE OF ROAD CONSTRUCTION IN JAPAN IN 1967, EXPRESSED IN TERMS OF ANNUAL EXPENDITURES FOR ROAD PROGRAMS, WAS APPROXIMATELY ONE TRILION YEN (ABOUT $2,780 MILLION), AND IN 1969 IT REACHED APPROXIMATELY ONE TRILLION TWO HUNDRED BILLION YEN (ABOUT $3,300 MILLION) TO OCCUPY APPROXIMATELY 2 PERCENT OF THE GROSS NATIONAL PRODUCT. HOWEVER, THE STATE OF DEVELOPMENT OF HIGHWAYS IS STILL VERY FAR FROM BEING ADEQUATE, AND IT IS FURTHER PLANNED TO APPROPRIATE ANNUAL BUDGETS EXCEEDING ONE TRILLION YEN IN ACCORDANCE WITH A 5-YEAR HIGHWAY DEVELOPMENT PLAN. A CONSPICUOUS FEATURE OF THE NUMBEROUS CONCRETE STRUCTURES THAT WILL BE CONSTRUCTED TO ACCOMPANY THIS ROAD DEVELOPMENT IS THAT THESE STRUCTURES ARE BECOMING OF LARGER SIZE WITH THE MARKED INCREASE IN TRAFFIC, PARTICULARY IN AND AROUND LARGE CITIES. SPECIFIC EXAMPLES INCLUDE THE PROPOSED CONSTRUCTION OF LARGE SUSPENSION BRIDGES SUCH AS KANMON BRIDGE, CONNECTING THE ISLANDS OF HONSHU AND KYUSHU, AND HONSHU-SHIKOKU INTERCONNECTION BRIDGE, CONNECTING THE ISLANDS OF HONSHU AND SHIKOKU. THE CONCRETE STRUCTURES USED IN LONG SUSPENSION BRIDGES, OF COURSE, ARE ALSO OF LARGE SIZE. THESE CONCRETE STRUCTURES ARE OF SUCH SIZE THAT THEY MAY BE CALLED MASS CONCRETE STRUCTURES. THEY DIFFER FROM DAM CONCRETE ONLY IN THAT UNIT CEMENT CONTENT IS HIGHER. IN THE DESIGN AND CONSTRUCTION OF SUCH STRUCTURES, IT IS NECESSARY TO CONSIDER VOLUME CHANGE OF CONCRETE DUE TO HEAT GENERATION AS IN THE CASE OF DAMS IN ORDER TO PREVENT CRACKING. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 108-117
  • Monograph Title: Concrete durability, cement paste, aggregates and sealing compounds
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00213855
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Feb 8 1971 12:00AM