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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>CONCRETE JOINT SURVEY</title>
      <link>https://trid.trb.org/View/98355</link>
      <description><![CDATA[RESULTS OF A STUDY OF SAWED-JOINT CONCRETE PAVEMENT IN COLORADO ARE PRESENTED. THE PERFORMANCE OF SAWED AND FORMED TRANSVERSE JOINTS ARE COMPARED. INFORMATION ON TIME OF SAWING THAT WOULD BE APPLICABLE TO THE IMPROVEMENT OF SAWED-JOINT SPECIFICATIONS IS DEVELOPED. DATA ON THE EFFECT OF JOINT SPACING, WELDED WIRE FABRIC AND BASE STABILIZATION ON PAVEMENT PERFORMANCE ARE PROVIDED. FIVE PROJECTS WERE INCLUDED. THE TEST PAVEMENT WAS 8 INCHES THICK, EXCEPT FOR A SINGLE 10-INCH THICK SECTION. THE MAJOR DESIGN FEATURES WERE' /1/ SAWED VERSUS FORMED TRANSVERSE JOINTS, /2/ TIME INTERVAL BETWEEN CONCRETE PLACEMENT AND JOINT SAWING, /3/ PLAIN VERSUS REINFORCED CONCRETE PAVEMENT. /4/ JOINT SPACING, /5/ DEPTH OF TRANSVERSE SAW CUT, AND /6/ THICKNESS OF CEMENT-TREATED SUBBASE. THE DESIGN FEATURES WERE PRIMARILY EVALUATED IN TERMS OF TRANSVERSE, LONGITUDINAL AND DIAGONAL CRACKING OF THE PAVEMENT SLABS. THIS EVALUATION CONSIDERED THE EFFECTS ON CRACKING OF SUCH FACTORS AS SOIL CHARACTERISTICS, CONCRETE MIX AND STRENGTH, AIR TEMPERATURE AND TRAFFIC DENSITY. SOME CONCLUSIONS DRAWN ARE' /1/ CONCRETE PAVEMENTS WITH SAWED JOINTS ARE AS RESISTANT TO CRACKING AS THOSE WITH FORMED JOINTS, /2/ PLAIN CONCRETE SLABS OF 25 FEET ARE AS RESISTANT TO CRACKING AS THOSE OF 20 FEET, /3/ OPTIMUM TIME FOR SAWING TRANSVERSE JOINTS IS FROM 12 TO 24 HOURS AFTER PLACEMENT OF CONCRETE, AND /4/ A 1 1/2- INCH DEEP SAW CUT APPEARS TO BE ADEQUATE FOR TRANSVERSE JOINTS IN 8-INCH THICK CONCRETE PAVEMENT.]]></description>
      <pubDate>Fri, 01 Jul 1994 00:00:00 GMT</pubDate>
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      <title>SCHEDULED OVERTIME EFFECT ON CONSTRUCTION PROJECTS</title>
      <link>https://trid.trb.org/View/206774</link>
      <description><![CDATA[This paper reviews an analysis of the impact of scheduled overtime operation on construction projects and the inflationary effects of such operations.  The data and findings cited in the previous Business Roundtable report (1974) on this subject have been found still valid and support the following conclusions: placing field construction operations on a project on a scheduled overtime basis disrupts the economy of the affected area, magnifies any apparent labor shortage, reduces labor productivity, and creates excessive inflation of construction labor costs without material benefit to the completion schedule; where a work schedule of 60 or more hours per week is continued longer than about two months, the cumulative effect of decreased productivity will cause a delay in the completion data beyond that which could have been realized with the same crew size on a 40-hour week; and where overtime operations are deemed necessary despite productivity losses--for example, on remote construction projects where bachelor housing is provided at the job site and on maintenance turnarounds--proper management can minimize the inflationary effects.  Management actions to be considered include use of an additional shift and periodic shutdown of the work for a Sunday or weekend.  (Author)]]></description>
      <pubDate>Thu, 28 Feb 1985 00:00:00 GMT</pubDate>
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