SCREENLESS PLANT OPERATION WITH COLD FEED CONTROL

THIS REPORT DESCRIBES THE PROCEDURES USED IN THE TRANSITION TO "SCREENLESS PLANT OPERATIONS" WITH CONTROL OF THE PROPORTIONING AT THE COLD FEED. THE COLD FEEDER MUST HAVE THE DESIRED PRECISION AND THE HOT BINS SHOULD BE MODIFIED TO FUNCTION AS ONLY ONE BIN FOR TEMPORARY STORAGE BETWEEN BATCHES. THE INFORMATION WAS OBTAINED ON 3 PROJECTS CONSTRUCTED DURING THE TRANSITION BY CONTRACTORS WITH HIGH-PRODUCTION AUTOMATIC BATCH PLANTS. CORRELATION SAMPLES WERE TAKEN AT THE COLD FEED, DRY BATCH SAMPLES AT THE PUGMILL, AND BITUMINOUS MIX SAMPLES FOR EXTRACTION. COMPARISON OF THE RESULTS OF THESE SAMPLES IS EVIDENCE THAT DESIRED PRECISION IN PROPORTIONING CAN BE OBTAINED WITH THE NEWER TYPES OF COLD FEEDERS. TABLES OF MEANS AND STANDARD DEVIATIONS SUMMARIZE THE RESULTS OBTAINED AND ARE A BASIS OF COMPARISON SINCE THE VALUES FOR STANDARD DEVIATION ARE A MEASURE OF VARIABILITY. EXTRACTION GRADATION RESULTS ARE INDICATIVE OF THE UNIFORMITY OF THE BITUMINOUS MIX PRODUCED WITH THIS METHOD. THE CONTROL OF PROPORTIONING AT THE COLD FEED IS ADVANTAGEOUS FROM THE SAMPLING STANDPOINT AND HAS NONE OF THE DRAWBACKS OF THE HOT BIN OR DRY BATCH PUGMILL-MIXED METHOD OF SAMPLING. THE DESIRED SCREENING EFFICIENCY CAN BEST BE ACCOMPLISHED DURING INDIVIDUAL AGGREGATE PRODUCTION. /AUTHOR/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1970/316/316-005.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Construction Practices--Flexible Pavement and presented at the 49th Annual Meeting. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Farrell, J L
  • Wright, W H
• Publication Date: 1970

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 63-69
• Monograph Title: Construction and construction equipment
• Serial:
  • Highway Research Record
  • Issue Number: 316
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Automation; Bituminous mixtures; Blending; Proportioning; Screenings
• Uncontrolled Terms: Batching
• Old TRIS Terms: Aggregate blending; Cold plant
• Subject Areas: Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 00219406
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Nov 9 1970 12:00AM