HIGHWAY CONCRETE MIXING PLANTS. CONTROL DURING AND AFTER PRODUCTION (IN FRENCH)

THE RESULTS ARE DESCRIBED OF CONTROLS AND MEASUREMENTS CARRIED OUT ON THE CONSTITUENTS AND ON THE PRODUCTION OF A HIGHWAY CONCRETE, AS PART OF A SERIES OF OBSERVATIONS ON A MOTORWAY CONCRETING SITE. THE CONTROLS RELATED TO - THE CHARACTERISTICS OF THE CEMENT USED, NOTABLY IN RELATION TO THE CONTENT OF THE SECONDARY CONSTITUENTS, THE BLAINE FINENESS AND MECHANICAL STRENGTHS; THE CHARACTERISTICS OF THE VARIOUS AGGREGATES, IN PARTICULAR, GRAIN SIZE AND CLEANLINNESS; THE CONCRETE PRODUCED; CONE SETTLEMENT, EASE OF HANDLING, OCCLUDED AIR CONTENT, MECHANICAL STRENGTHS. WHENEVER POSSIBLE, THE PRODUCTION OF CONCRETE WAS CONTROLLED BY MEANS OF CONTINUOUS RECORDING OF THE PARAMETERS OF PRODUCTION, INVOLVING WEIGHING OF THE VARIOUS CONSTITUENTS, ENERGY CONSUMED BY MIXING, TEMPERATURE OF CONSTITUENTS, AND RESISTIVITY OF SANDS. THE RESULTS OBTAINED MAKE IT POSSIBLE TO ASSESS THE VARIABILITY OF THE CHARACTERISTICS OF THE CONCRETES AND THEIR CONSTITUENTS. MOREOVER THE RECORDING OF THE PARAMETERS AND CONTINUOUS CONTROL DURING PRODUCTION CAN MAKE IT POSSIBLE:- (1) TO AVOID USING BATCHES WITH CHARACTERISTICS WHICH ARE INCOMPATIBLE WITH A PROPER SURFACING AND DURABILITY OF THE PAVEMENT, AND (2) TO DETECT AND LOCALIZE OPERATING FAULTS IN THE PRODUCTION EQUIPMENT SUFFICIENTLY IN TIME TO ENSURE THAT THE CONCRETE PRODUCED DOES NOT FALL BELOW STANDARD. TO SUM UP, IT SEEMS THAT THOUGH PROBLEMS OF THE BATCHING OF AGGREGATES AND CEMENT MAY BE FAIRLY SATISFACTORILY SOLVED, THE SAME IS NOT TRUE OF THE REGULARITY OF THE TOTAL WATER CONTENT OF THE CONCRETE, WHICH IS NEVERTHELESS A FACTOR OF PRIME IMPORTANCE FOR PROPER CONCRETING PROCEDURE AND ALSO FOR THE QUALITY AND DURABILITY OF THE CONCRETE. /LCPC/A/RRL/

• Supplemental Notes:
  • No 30, pp 137-156, 14 FIG, 4 TAB, 8 PHOT, 2 REF
• Authors:
  • Parey, C
• Publication Date: 1968-3

Media Info

• Serial:
  • Bull Liaison Labs Routiers /France/
  • Publisher: Laboratoire Central des Ponts et Chausees (LCPC)

Subject/Index Terms

• TRT Terms: Aggregates; Cement; Concrete; Durability; Grain size (Geology); Measurement; Mixing plants; Moisture content; Pavements; Production control; Quality control; Road construction
• Uncontrolled Terms: Batching; Characteristics; Quality
• Subject Areas: Construction; Geotechnology; Highways; Pavements;

Filing Info

• Accession Number: 00214886
• Record Type: Publication
• Source Agency: Road Research Laboratory /UK
• Files: TRIS
• Created Date: Jun 29 1970 12:00AM