<?xml version="1.0" encoding="utf-8"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>TRB Publications Index</title><link>http://pubsindex.trb.org/</link><atom:link href="http://pubsindex.trb.org/common/TRIS Suite/feeds/rss.aspx?tc=NN%3AFcb" rel="self" type="application/rss+xml" /><description></description><language>en-us</language><copyright>Copyright © 2015. National Academy of Sciences. All rights reserved.</copyright><docs>http://blogs.law.harvard.edu/tech/rss</docs><managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor><webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster><image><title>TRB Publications Index</title><url>http://pubsindex.trb.org/Images/PageHeader-wTitle.png</url><link>http://pubsindex.trb.org/</link></image><item><title>Pilot Studies to Compare Single- and Multi-Unit Recycling Trains on Partial-Depth (Cold In-Place) Recycling Projects</title><link>http://pubsindex.trb.org/view/2686276</link><description><![CDATA[The construction of two partial-depth (cold in-place) recycling projects was monitored and the quality control results were analyzed to compare gradations produced with single- and multi-unit recycling trains, to assess the effect of recycling train forward speed on gradation, and to compare differences between emulsified and foamed asphalt recycling agents in partial-depth recycling applications. The research highlighted the challenges with variability and small sample sizes associated with in-place recycling but provided representative and consistent results between projects. The results showed that there was no discernable difference in the density and strengths of partial-depth recycling layers produced with the single- and multi-unit recycling trains. The main benefit of the multi-unit train was better control of maximum aggregate size by the on-board screens and crushing unit, however, the crushing unit did not appear to change or improve the finer portion of the gradation (i.e., material passing the 5-mm sieve), which has a known larger influence on compaction density, air-void content reduction, strength, moisture resistance, and stiffness. The recycling train type and forward speed did influence the coarse portion of the gradation (i.e., &gt;5 mm), but did not appear to influence compaction density. Test results indicated that the sections treated with emulsified asphalt had higher densities than those treated with foamed asphalt. However, there was considerable variability in materials and pavement structure along the length of the project, which probably had an influence on all results. The findings permit agencies to specify that recycling train and recycling agent choice can be the contractor’s decision.]]></description><pubDate>Thu, 02 Apr 2026 15:23:59 GMT</pubDate><guid>http://pubsindex.trb.org/view/2686276</guid></item><item><title>BENEFICIAL USES OF PROCESSED SEDIMENT</title><link>http://pubsindex.trb.org/view/513103</link><description><![CDATA[This presentation discusses the beneficial uses of processed sediment from a marketing perspective.  The long term goal is for processed dredged material to be a commodity.]]></description><pubDate>Thu, 23 Dec 1999 00:00:00 GMT</pubDate><guid>http://pubsindex.trb.org/view/513103</guid></item><item><title>STRENGTH-CONSISTENCY INDICES FOR A COHESIVE SOIL</title><link>http://pubsindex.trb.org/view/126661</link><description><![CDATA[A PROBLEM OF CONSIDERABLE IMPORTANCE IN MATERIALS CONTROL AND TESTING, AS WELL AS THE PRACTICAL ASPECTS OF MANY PHASES OF CONSTRUCTION, IS THAT OF RELATING OR ESTIMATING THE RESPONSE OF A COHESIVE SOIL AT A PARTICULAR CONSISTENCY OR STRENGTH, UNDER A PARTICULAR SET OF ENVIRONMENTAL CIRCUMSTANCES, FROM THE RESPONSE FOR THE SAME SET OF CIRCUMSTANCES BUT AT A DIFFERENT MOISTURE CONTENT OR CONSISTENCY OF THE SOIL. THIS DIFFICULTY IS DISCUSSED IN TERMS OF A STRENGTH-CONSISTENCY INDEX BASED ON THE UNCONFINED COMPRESSION STRENGTH OF A REMOLDED PLASTIC CLAY OBTAINED BY A CONSTANT RATE OF DEFORMATION TEST. STRENGTH AND CONSISTENCY CHARACTERISTICS OF VARIOUS SOIL SPECIMENS AT DIFFERENT MOISTURE CONTENTS ARE GIVEN. SPECIMENS ARE PREPARED BY VARIOUS TECHNIQUES, INCLUDING EXTRUSION AND COMPACTION PROCESSES. IN ADDITION, THE EFFECTS OF OVER- CONSOLIDATION AND DESICCATION ARE CONSIDERED. THE USEFULNESS OF SUCH AN INDEX IN MATERIALS CONTROL AND TESTING IS ILLUSTRATED FOR SOME ASPECTS OF CREEP AND VIBRATORY LOADING PHENOMENA. ANALYTIC EXPRESSIONS ARE GIVEN FOR THE RESPONSE. /AUTHOR/]]></description><pubDate>Fri, 28 Oct 1994 00:00:00 GMT</pubDate><guid>http://pubsindex.trb.org/view/126661</guid></item><item><title>TYPES AND CAUSES OF FAILURE IN HIGHWAY PAVEMENTS</title><link>http://pubsindex.trb.org/view/104948</link><description><![CDATA[SIXTY-TWO DIFFERENT TYPES OF PAVEMENT DISTRESS ARE DISCUSSED AND PICTURES ARE INCLUDED WITH THE HOPE OF OBTAINING SOME AGREEMENT IN TERMINOLOGY IN REFERENCE TO FAILURES IN HIGHWAY PAVEMENTS. IT IS CONCLUDED THAT NO MATTER HOW WELL THE PRELIMINARY WORK HAS BEEN ACCOMPLISHED SUCH AS MATERIALS EVALUATION, DESIGN, PLANNING AND SPECIFICATION WRITING THE PROBLEM OF TURNING OUT A GOOD JOB RESTS WITH THE CONSTRUCTION ENGINEER.]]></description><pubDate>Fri, 07 Oct 1994 00:00:00 GMT</pubDate><guid>http://pubsindex.trb.org/view/104948</guid></item><item><title>CONSTRUCTION PRACTICES FOR MATERIALS CONTROL AND BATCHING OPERATIONS FOR RIGID PAVEMENT</title><link>http://pubsindex.trb.org/view/102644</link><description><![CDATA[THE TRAINING AND SPECIFIC DUTIES OF THE BATCH PLANT INSPECTOR ARE EXPLAINED IN DETAIL. TRAINING CAN TAKE PLACE DURING THE WINTER AND CLASSES SHOULD BE SMALL OF NOT MORE THAN TEN OR TWELVE MEN. THE LOGICAL SEQUENCE FOR INSPECTING IS DIVIDED INTO THREE PHASES: PRELIMINARY INSPECTION, OPERATIONAL CONTROL, AND REPORTS. PRELIMINARY INSPECTION INCLUDES APPROVAL OF PLANT LAYOUT AND STOCKPILING, INSPECTION OF EQUIPMENT, AND MATERIALS, AND MIX DESIGNS. OPERATIONAL CONTROL INVOLVES CHECKING AGGREGATE MOISTURE, SCALE CHECKING, PREPARATION OF TEST SPECIMENS, MAINTENANCE OF STOCKPILES, AND DAILY CEMENT CHECKS. UNIFORMITY IS THE GOAL IN REPORTING.]]></description><pubDate>Fri, 12 Aug 1994 00:00:00 GMT</pubDate><guid>http://pubsindex.trb.org/view/102644</guid></item><item><title>DEVELOPMENT OF PARTS AND MATERIALS INVENTORY SYSTEM</title><link>http://pubsindex.trb.org/view/187449</link><description><![CDATA[The Parts and Materials Inventory Subsystem (PMIS), one of four interrelated subsystems in the equipment management system under development by the Arkansas State Highway and Transportation Department (ASHTD), is described. The established user objectives of PMIS are to (a) maintain parts inventory balances, (b) support established fill-rate objectives, (c) set efficient limits on stock levels, (d) control stock replenishment actions, and (e) evaluate inventory management performance. Additional desired features include interdistrict checking to locate a needed item stocked elsewhere in the state and error-free distribution records for accounting. Due to various inadequacies in the existing method of numbering stock, new numbering schemes were devised for all inventory items and stockpile locations. All stock items and locations were then converted to the new numbers. The PMIS design specifies on-line computer terminals in each district stockroom to process normal accounting transactions and meet user needs. Inventory transaction information is input at the district and subjected to detailed editing to ensure data integrity. Balancing and editing routines permit all error correction to be made at the data source. Various stock management reports are provided in on-line and batch modes for district and Central Headquarters. PMIS operations were tested in two ASHTD districts. Preparations are under way for statewide implementation. (Author)]]></description><pubDate>Mon, 28 Feb 1983 00:00:00 GMT</pubDate><guid>http://pubsindex.trb.org/view/187449</guid></item><item><title>THE QUANTITATIVE DETERMINATION OF ALITE AND BELITE RESIDUES IN PARTLY HYDRATED CEMENT PASTES</title><link>http://pubsindex.trb.org/view/47055</link><description><![CDATA[The alite and belite contents of the clinker residue of partly hydrated cement pastes can be obtained by X-ray quantitative analysis.  The X-ray method used is essentially the same as that for unhydrated cements.  The results of determinations on pastes from three different portland cements demonstrates the increase in hydration both of alite and belite at any given time with increase in the water/cement ratio.  /Author/]]></description><pubDate>Wed, 06 Oct 1976 00:00:00 GMT</pubDate><guid>http://pubsindex.trb.org/view/47055</guid></item><item><title>CONTROL OF MATERIALS AND MIXTURES FOR CONCRETE FOR PAVEMENTS</title><link>http://pubsindex.trb.org/view/104648</link><description><![CDATA[THE METHODS USED BY THE IOWA HIGHWAY COMMISSION TO CONSTRUCT 700 MILES OF CONCRETE PAVEMENT IN 1928 TO INSURE CONCRETE OF UNIFORM QUALITY CONTAINING A QUANTITY OF CEMENT WITHIN ONE PERCENT OF THAT ESTIMATED IN THE SPECIFICATIONS ARE DESCRIBED. METHODS FOR FIELD DETERMINATION OF THE FACTORS NEEDED FOR MAINTANING ACCURATE MEASUREMENT OF MATERIALS, SUCH AS SPECIFIC GRAVITY, CONTAINED MOISTURE, AND ABSORPTION OF AGGREGATES, ARE GIVEN. METHODS AND APPLIANCES FOR WEIGHING AGGREGATES AND MEASURING WATER ARE DISCUSSED. RESULTS ARE EVALUATED BY MEANS OF TRANSVERSE TESTS MADE IN THE FIELD, COMPRESSIVE TESTS OF CYLINDERS AND CORES AND DAILY RECORDS OF QUANTITIES OF MATERIALS USED. THE AVERAGE OVER-RUN IN CEMENT USED FOR ALL JOBS WAS 1.2 PERCENT AND 52 PERCENT OF THE ENTIRE MILEAGE WAS WITHIN 1.0 PERCENT OF THE ESTIMATED QUANTITY OF CEMENT. AS THESE FIGURES INCLUDE THE OVER-RUNS DUE TO EXTRA DEPTH OF SLAB, THE OBJECTIVE WAS SUBSTANTIALLY ATTAINED. THE STRENGTH TESTS SHOW MARKED IMPROVEMENT IN UNIFORMITY. RANGE IN AVERAGE STRENGTH OF JOBS-COMPRESSION AGE 28 DAYS - MAXIMUM 5,404, AVERAGE 4,538, MINIMUM 3,732 LBS PER SQUARE INCH; TRANSVERSE AGE 10 DAYS, MAXIMUM 725, AVERAGE 600, MINIMUM 454 LBS. PER SQUARE INCH. THE MEAN VARIATION FROM THE AVERAGE OF STRENGTHS OF INDIVIDUAL SPECIMENS FOR THE VARIOUS JOBS RANGED FROM 4.6 PERCENT TO 17.8 PERCENT FOR TRANSVERSE AND FROM 4.7 PERCENT TO 17.2 PERCENT FOR COMPRESSION TESTS. THESE FIGURES ARE  SHOWN IN COMPARISON WITH CORRESPONDING DATA FROM EARLIER TESTS UNDER MUCH LESS COMPLETE METHODS OF CONTROL. EFFECTS OF DIFFERENT PROPORTIONS AND KINDS OF AGGREGATE, AND RELATIONS BETWEEN TRANSVERSE AND CRUSHING STRENGTHS, AS INDICATED BY THESE DATA, ARE DISCUSSED.]]></description><pubDate>Tue, 01 Jun 1971 00:00:00 GMT</pubDate><guid>http://pubsindex.trb.org/view/104648</guid></item></channel></rss>