INCREASING PRODUCTION AND PROFITS WITH HOT CONCRETE

A NEW CURING METHOD IS DESCRIBED WHICH ESSENTIALLY IS A TECHNIQUE WHICH ACCELERATES CEMENT HYDRATION BY PREHEATING THE MIX TO OBTAIN HOT CONCRETE AT A TEMPERATURE BETWEEN 95 AND 145 F. LOW PRESSURE STEAM IS INJECTED INTO THE MIXER DURING THE MIXING PROCESS. WHEN USED IN CONJUNCTION WITH THERMALLY INSULTED FORMS OR COMPACT MOLDS, THE PROCESS ENABLES THE HOT CONCRETE TO HARDEN MUCH MORE RAPIDLY THAN STANDARD CURING METHODS. DETAILS ARE GIVEN OF THE EQUIPMENT AND MECHANICS OF THE METHOD. A TURBO MIXER IS ILLUSTRATED IN WHICH THE STEAM IS INJECTED INTO THE MIX VIA THE CENTRAL DRIVE SYSTEM THROUGH LANCES ARRANGED IMMEDIATELY BEHIND THE MIXING ARMS, OR DIRECTLY THROUGH HOLLOW MIXING ARMS. DEPENDING ON THE MIXING SYSTEM USED, THE OPERATING PRESSURE CAN VARY BETWEEN 14 AND 70 PSI. WATER REQUIREMENT CALCULATIONS MUST TAKE INTO ACCOUNT THE VOLUME OF CONDENSATE WATER INTRODUCED INTO THE MIX. EARLY STRENGTH AND ULTIMATE STRENGTH VALUES VARY WITH THE COMPOSITON OF THE CEMENT IN QUESTION. THE VARIOUS FACTORS GOVERNING THE ATTAINMENT OF HIGH EARLY STRENGTH VALUES ARE REVIEWED. A FIGURE ILLUSTRATING THE INFLUENCE OF A HIGH CEMENT CONTENT ON THE HARDENING CURVE IS PRESENTED. A QUALITY CONTROL TEST PROGRAM GIVING RELEVANT INFORMATION IS DETAILED. APPLICATIONS OF THIS METHOD ARE REVIEWED AND THE ADVANTAGES OF THE PROPOSED METHOD ARE DISCUSSED.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/08879672
• Authors:
  • Schneider, D K
• Publication Date: 1973-7

Media Info

• Features: Figures; References;
• Pagination: p. 21-32
• Serial:
  • PRECAST/PRESTRESSED CONCRETE INSTITUTE. JOURNAL
  • Volume: 18
  • Issue Number: 4
  • Publisher: Precast/Prestressed Concrete Institute
  • ISSN: 0887-9672

Subject/Index Terms

• TRT Terms: Cement; Concrete curing; Equipment; Hydration; Methodology; Mixers; Quality control; Steam curing; Water consumption
• Old TRIS Terms: Quality control testing; Water requirements
• Subject Areas: Construction; Highways; Materials;

Filing Info

• Accession Number: 00215675
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 19 1974 12:00AM