AUTOMATED INVESTIGATION INTO THE FREEZE - THAW CYCLE IN CHIPPINGS (8/10 MM) WITH THE USE OF THAWING AGENTS

AUTOMATISIERTE FROST-TAUWECHSELUNTERSUCHUNGEN AN SPLITTEN 8/10 MM UNTER VERWENDUNG VON TAUMITTELN

A TIME-SAVING TECHNIQUE HAS BEEN DEVELOPED FOR CHECKING THE FROST RESISTANCE OF 8/10 MM CHIPPINGS USING AUTOMATIC FROSTING EQUIPMENT. TO INCREASE THE FREEZING EFFECT VARIOUS THAWING AGENTS WERE ADDED TO THE WATER. THE FROSTING MACHINE IS A KYROSTAT MC5 WITH A PG3 PROGRAMMER MANUFACTURED BY COLORA MESSTECHNIK GMBH, LORCH. IT CAN ACCOMMODATE TEN BOTTLES EACH WITH 300 GRAMMS OF 8/10 MM CHIPPINGS. 75 HOURS ARE NECESSARY TO COMPLETE 20 FREEZE-THAW CYCLES. FOR COMPARISON PURPOSES THE MATERIAL WHICH SPLITS OFF IS MEASURED IN PERCENTAGES BY WEIGHT OF MATERIAL PASSING A 5 M SIEVE FROM THAT WEIGHED AT THE COMMENCEMENT. THE FOLLOWING WERE USED AS THAWING AGENTS: ALCOHOL, UREA, NACL, FORMALDEHYDE, NH3, SULPHURIC ACID AND CONTAMINATED RHINE WATER. THE CHIPPINGS USED WERE FROM SEVEN DIFFERENT MINERAL TYPES. THE RESULTS OF THE RESEARCH ARE PRODUCED IN SUMMARY FORM. THE ADDITIVES RESULTED IN A VARYING INCREASE IN SPLIT-OFF. A DEFINITE EXPLANATION IN PHYSICS TERMS IS NOT YET POSSIBLE. ACCORDING TO THE RESULTS THE NORMAL TEST IN PURE WATER APPEARS TO BE INADEQUATE IF THE MINERALS COME IN CONTACT WITH THE THAWING AGENT.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00392162
• Authors:
  • VOGLER, H
• Publication Date: 1976

Language

• German

Media Info

• Pagination: 392-5
• Serial:
  • STR U AUTOBAHN
  • Volume: 27
  • Issue Number: 10
  • ISSN: 0039-2162

Subject/Index Terms

• TRT Terms: Alcohols; Automation; Chippings; Freeze thaw durability; Frost; Laboratories; Measuring instruments; Sensitivity; Sodium chloride; Sulfuric acid; Test procedures; Tests; Urea; Water
• ITRD Terms: 7347: Alcohol; 6155: Apparatus (measuring); 3882: Automatic; 4585: Chippings; 2577: Freezing thawing cycle; 2585: Frost; 6237: Laboratory (not an organization); 5928: Sensitivity; 7316: Sodium chloride; 7370: Sulphuric acid; 6255: Test; 6288: Test method; 7335: Urea; 4355: Water
• Subject Areas: I36: Aggregates;

Filing Info

• Accession Number: 01293072
• Record Type: Publication
• Source Agency: Forschungsgesellschaft für Straßen- und Verkehrswesen (FGSV)
• Files: ITRD
• Created Date: Nov 21 2010 3:50AM