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    <title>Transport Research International Documentation (TRID)</title>
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    <atom:link href="https://trid.trb.org/Record/RSS?s=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" rel="self" type="application/rss+xml" />
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    <language>en-us</language>
    <copyright>Copyright © 2026. 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>Transport Research International Documentation (TRID)</title>
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      <link>https://trid.trb.org/</link>
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    <item>
      <title>Preparation and Mix Design of Usual-Temperature Synthetic Pitch–Modified Cutback Asphalt</title>
      <link>https://trid.trb.org/View/2035101</link>
      <description><![CDATA[Usual-temperature synthetic pitch (USP) is a modifier that can efficiently reduce the mixing temperature and improve the overall engineering properties of warm-mix asphalts; however, few studies are reported for its application in cold patch asphalt. In this article, cutback asphalts were prepared with USP, bitumen, biodiesel, an antistripping agent, and a tackifier. Referring to a series of single-factor analyses on the cutback asphalt viscosity, the reasonable dosage ranges for the USP, antistripping agent, and tackifier were first determined. Based on these, a four-factor and four-level orthogonal test plan was proposed to guide the selection of some potential appropriate mix design schemes. The recommended mix design schemes were then screened out by successively examining the physical properties, adhesion, workability, Marshall stability, high- and low-temperature rheological properties, and compatibility. Two design schemes with mass proportions of 6:18:0.3:6 (Scheme 1) and 6:20:0.4:2 (Scheme 2) for USP, diluent, antistripping agent, and tackifier, respectively, were finally selected. The engineering properties of the prepared specimens meet the standard requirements. Compared with Scheme 1, Scheme 2 presents better Marshall stability and high- and low-temperature performance. The proposed mix design schemes can guide the preparation of USP-modified cold patch asphalts and promote their application in practice.]]></description>
      <pubDate>Wed, 30 Nov 2022 10:56:59 GMT</pubDate>
      <guid>https://trid.trb.org/View/2035101</guid>
    </item>
    <item>
      <title>Mechanical properties of roads unbound treated with synthetic fluid based on isoalkane and tall oil</title>
      <link>https://trid.trb.org/View/1898522</link>
      <description><![CDATA[The unbound layers are an essential component of both highly trafficked and low-volume roads as their mechanical properties are of major importance when it comes to ensuring a well-performing pavement. However, as the aggregates employed as road construction materials naturally display a wide variation in the mechanical properties according to their geological origins, the pavement engineer may be interested in utilizing stabilization technologies to deliberately modify and adjust the behaviour of the road courses. This study sheds light on an innovative synthetic fluid technology composed of isoalkane and tall oil pitch. Repeated load triaxial tests investigate the resilient modulus and the deformation behaviour of samples treated with the synthetic system according to different percentages. Furthermore, cyclic triaxial tests are also performed after exposing stabilized specimens to a series of freeze–thaw cycles. The principle of the rolling bottle test is adopted to assess the integrity with stripping loss on loose aggregates coated by the product. The laboratory results show that evident variations in the mechanical properties can be attained once the aggregates are mixed with the synthetic agent and that a strong coating resistant to water and external actions is formed.]]></description>
      <pubDate>Thu, 20 Jan 2022 12:14:41 GMT</pubDate>
      <guid>https://trid.trb.org/View/1898522</guid>
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    <item>
      <title>A Laboratory Study on Rutting Resistance Performance of High Modulus Asphalt Mixture</title>
      <link>https://trid.trb.org/View/1634837</link>
      <description><![CDATA[In order to improve the rutting resistance of expressway asphalt pavement, a hard asphalt additive compound, EME-14, was used to prepare the high modulus asphalt mixture. Using the rutting test and dynamic modulus test at different temperatures, the high and low temperature properties of the EME-14 and common high modulus asphalt mixtures EME-14, SUP-20, and SBS modified AC-20 asphalt mixtures were compared and analyzed. Predictive analysis was carried out by using the dynamic modulus main curves. The results showed that the dynamic stability of high modulus asphalt mixture EME-14 prepared by hard pitch additive compound was 11,059 times/mm, which was about 1.4 times of EME-14 dynamic stability of common high modulus asphalt mixture, 1.6 times of SUP-20 dynamic stability, and 1.8 times of modified AC-20. Compared with traditional middle-layer asphalt mixture, it has excellent rutting resistance performance at high temperatures.]]></description>
      <pubDate>Thu, 31 Oct 2019 11:35:45 GMT</pubDate>
      <guid>https://trid.trb.org/View/1634837</guid>
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    <item>
      <title>Influence of Viscosities of PDA Pitch and Flux on Blended Bitumen Viscosity</title>
      <link>https://trid.trb.org/View/1558678</link>
      <description><![CDATA[The production of bitumen in Indian refineries is carried out by air blowing and component blending. In the component blending process, a highly viscous propane deasphalted (PDA) pitch is blended with a less viscous flux. The choice of the proportion of these two components is normally arrived at to meet the required technical specification such as penetration at 25°C and viscosity at 60 and 135°C. However, it is not clear at this point in time, the influence of constituent materials on the rheological response of the binder. In this investigation, two ratios of PDA pitch and flux (75:25, 80:20) were blended in the laboratory. The rheological characterization of constituents and the final blend were carried out using a rotational viscometer at temperatures of 120, 140 and 160°C. Four viscosity mixing ‘rules’ were used to estimate the final blend viscosity from the individual constituent viscosities. The predictions varied with a wide range of errors.]]></description>
      <pubDate>Sun, 16 Dec 2018 21:39:08 GMT</pubDate>
      <guid>https://trid.trb.org/View/1558678</guid>
    </item>
    <item>
      <title>Evaluation of residual products from heavy oil refining for the use as an asphalt pavement material</title>
      <link>https://trid.trb.org/View/1435171</link>
      <description><![CDATA[Global oil prices are increasing, and the current demand for the fuel is outpacing the supply of traditional crude oil sources. Therefore, the petroleum industry has applied great effort to extract more valuable products such as fuel from heavy oil sources such as Canadian oil sands and Venezuelan heavy oils. One refining process that uses heavy oil sources is the solvent deasphalting (SDA) process. SDA extracts most oil components, leaving residual products with more asphaltenes compared to the conventional asphalt binder for road pavement. In this study, the physical and chemical properties of the residual products, known as pitch, have been investigated to evaluate their applicability as a binder for asphalt pavement. From the various tests, it was found that the pitch is too hard and brittle to be used for asphalt pavement due to its very high viscosity. Therefore, the pitch was modified with vegetable-oil-based additives, after which it exhibited similar basic material properties and rheological behaviours to those of conventional asphalt binder, indicating that the modified pitch could be used as a binder for asphalt pavement.]]></description>
      <pubDate>Wed, 21 Dec 2016 11:29:25 GMT</pubDate>
      <guid>https://trid.trb.org/View/1435171</guid>
    </item>
    <item>
      <title>Study on the Application of Coal Tar Pitch in Middle Asphalt Layer of Shanxi Highway Project</title>
      <link>https://trid.trb.org/View/1275539</link>
      <description><![CDATA[In this study, the objective was dedicated to the application of coal tar pitch in road engineering construction. The present application situation of the coal pitch was discussed. The asphalt and the asphalt mix were designed. Appropriate adjustment of the proportion of coal pitch and petroleum asphalt improved the technical indexes of asphalt. The optimal bitumen-aggregate ratio based on the closest skeleton-interlocking dense condition principle is selected. Results indicated that the mix with modified coal tar pitch and the designed optimal bitumen-aggregate ratio had good performance, involving high temperature stability, low temperature cracking resistance and water stability. It was also found that the construction temperature can be reduced by the warm mix asphalt additive, decreasing the volatile of polycyclic aromatic hydrocarbon which was a carcinogenic substance in coal pitch. The conclusion of this paper is valuable for the further application of coal tar pitch.]]></description>
      <pubDate>Mon, 12 May 2014 13:08:02 GMT</pubDate>
      <guid>https://trid.trb.org/View/1275539</guid>
    </item>
    <item>
      <title>Future availability and assessment of alternative surfacing binders</title>
      <link>https://trid.trb.org/View/1259292</link>
      <description><![CDATA[Bitumen, an important component used in road construction in Australia and New Zealand, is manufactured from a finite, non-renewable crude oil resource.  A number of commercially available alternative binders and bitumen extended binders have been studied to determine whether these materials could be used as a suitable replacement/extender for bitumen.  A lifecycle analysis has also been conducted on each of the binders studied so that the costs associated with their use can be estimated.  The results of binder and laboratory asphalt performance tests indicated that the majority of the binders studied could be used in specialised pavement applications.  Bitumen extended binders containing tall oil pitch appear to be the most likely candidates for use as a direct replacement for the bitumen grades that are currently used in Australia.  A sprayed sealing road trial was conducted using a tall oil pitch (Tallex) extended binder.  The extended binder behaved similarly during the trial, in terms of its construction and performance characteristics, as conventional Class 170 bitumen.]]></description>
      <pubDate>Thu, 15 Aug 2013 09:47:58 GMT</pubDate>
      <guid>https://trid.trb.org/View/1259292</guid>
    </item>
    <item>
      <title>Nachweis von teer-/pechhaltigem Strassenaufbruch und zur Charakterisierung von Bitumen unterschiedlicher Provenienz / Detection of broken out road materials containing tar/ bitumen for the characterisation of bitumen of different origin</title>
      <link>https://trid.trb.org/View/1246824</link>
      <description><![CDATA[Noch immer fehlt ein zuverlaessiges Schnellverfahren, das den gesicherten Nachweis von polycyclischen aromatischen Kohlenwasserstoffen in Strassenaufbruchmaterial ermoeglicht. Halbleitersensoren (elektronische Nasen) sind auch von Personen ohne chemischen Vorkenntnisse zu bedienen und liefern schnell Ergebnisse mit einer einigermassen repraesentativen Probemenge. Die Moeglichkeiten der Halbleitersensoren koennten auch bei der Unterscheidung von Komponenten zur Strassenmarkierung genutzt werden. ABSTRACT IN ENGLISH: There is still no reliable rapid test method for the secure detection of polycyclic aromatic hydrocarbons in broken out road materials. Semiconductor sensors (electronic noses) also need to be operated by persons without chemical knowledge and deliver quick results for a reasonably representative sample quantity. The advantages of semiconductor sensors could also be used for the differentiation of components for road markings.]]></description>
      <pubDate>Tue, 02 Apr 2013 09:11:44 GMT</pubDate>
      <guid>https://trid.trb.org/View/1246824</guid>
    </item>
    <item>
      <title>Wohin mit dem Teer? - Die Verwertung von teer-/pechhaltigem Strassenaufbruch in Hamburg / What can be done about the tar? - Recycling of tar-contaminated milled road construction material in Hamburg</title>
      <link>https://trid.trb.org/View/1225360</link>
      <description><![CDATA[Bis in die 1970er Jahre wurden in Hamburg Strassen mit Teer als Bindemittel hergestellt. Dem Verwertungsgedanken des Kreislaufwirtschafts- und Abfallgesetzes folgend, wurde der so belastete Aufbruch wieder im Strassenbau eingesetzt. Dazu fand im Kaltmischverfahren eine Aufbereitung mit Zement nach den Anforderungen der "Zusaetzlichen Technischen Vertragsbedingungen und Richtlinien fuer Tragschichten im Strassenbau" statt. Kohlenteerhaltige Bitumengemische werden aufgrund ihrer krebserregenden Bestandteile - Polyzyklische Aromatische Kohlenwasserstoffe (PAK) - als "gefaehrlicher Abfall" (Abfallschluesselnummer 170301) eingestuft. Trotz dieser als umweltgerecht eingestuften Verwertungsmethode begannen im Amt fuer Verkehr und Strassenwesen Ueberlegungen, den teer-/pechhaltigen Strassenaufbruch aus dem Stoffkreislauf auszuschleusen und einer optimierten Verwertung zuzufuehren. (A) ABSTRACT IN ENGLISH: Until the seventies large quantities of tar were used in road construction. Following the Waste and Recycling Act, methods had to be developed to deal with such material, because it is known, tar respective Polycyclic Aromatic Hydrocarbons is labled as dangerous. Hence tar contaminated material was mixed in plant with cement to be used in base courses, in compliance with the Additional Technical Conditions of Contract and Directives for Road Construction. In spite of this environmental friendly method the Department of Traffic and Road Construction started a new approach. The two main goals were: tar contaminated material has to be eliminated from the recycling process and most of the high-quality stones in asphalt should be re-used. (A)]]></description>
      <pubDate>Wed, 12 Dec 2012 09:28:41 GMT</pubDate>
      <guid>https://trid.trb.org/View/1225360</guid>
    </item>
    <item>
      <title>Investigations on bitumenpolymer composition as insulatingseal materials</title>
      <link>https://trid.trb.org/View/1210517</link>
      <description><![CDATA[The aim of these investigations was to prepare binders, based on coal-tar pitch or pitch-asphalt blends modified by polymers, which would be successfully applied in building industry.  To modify pitch, poly(oxyethylene)diol (molecular weight: 2000) was used.  The polymer affects benzo[a]pyrene very effectively.  After choosing the optimal conditions of the mixing process, homogeneous pitch-polymer compositions were obtained.  With the purpose of improving their elastoplastic properties, the following additives were introduced to the compositions obtained,: petroleum asphalts (of various penetrations and softening points), plasticizers (petroleum and coal oils), granular fillers (among others, those of thixotropic properties) and other polymers (butadienestyrene latex and balmy rosin).  Coal-tar pitch and petroleum asphalt, modified by polymers (e.g. poly(oxyethylene)diol) as well as by oil plasticizers, B-S latex and fillers (chalk, colloidal silica), meet requirements of modern bituminous binders and can be applied as insulating-seal materials in building industry.  The modified bitumens are characterized by increased adhesion to mineral aggregates and concrete, advantageous resistance to freezing as well as good plasticity and thermal stability.  In the light of this, it is also possible to use them as binders in road construction.]]></description>
      <pubDate>Sat, 25 Aug 2012 00:42:18 GMT</pubDate>
      <guid>https://trid.trb.org/View/1210517</guid>
    </item>
    <item>
      <title>Recent research on road tars in CSIRO</title>
      <link>https://trid.trb.org/View/1209232</link>
      <description><![CDATA[The temperature susceptibility of tars from onia gegi oil gasification plants and from coke ovens is improved by digestion with various bituminous coals at a fairly high temperature.  The temperature susceptibility of the modified tars, in which the coal appears to be partly dissolved, is similar to that of bitumen.  The preparation and stability of vertical retort pitch bitumen mixtures are described (A).]]></description>
      <pubDate>Fri, 24 Aug 2012 23:41:38 GMT</pubDate>
      <guid>https://trid.trb.org/View/1209232</guid>
    </item>
    <item>
      <title>A comparative study of the chemical and physical properties of petroleum with coal tars and bitumens</title>
      <link>https://trid.trb.org/View/1209116</link>
      <description><![CDATA[The production of petroleum tar can equal about 40 per cent of the total coal tar production of the Commonwealth.  From the physical properties and chemical composition it is shown that petroleum tar bears little resemblance to bitumen except in that it has the same temperature susceptibility properties; however it does resemble tar produced by carbonization of coal, and in particular is very similar to horizontal retort tar.  Because of these distinctive features, it should be very suitable for the manufacture of various grades of road tar.  It is anticipated that, as time goes by, the production in Australia of petroleum tars will increase while the production of coal tars, particularly horizontal and vertical retort, will steadily diminish (A).]]></description>
      <pubDate>Fri, 24 Aug 2012 23:38:45 GMT</pubDate>
      <guid>https://trid.trb.org/View/1209116</guid>
    </item>
    <item>
      <title>Materials and testing - bitumen: group report</title>
      <link>https://trid.trb.org/View/1209106</link>
      <description><![CDATA[This group report summarises the following papers: preliminary microviscometer studies of carbon black/ rubber/ bitumen dispersions (Martin=KG); carbon black - its nature and possible effects on the characteristics of bituminous road binders (Aliotti=AG); the rheological properties of bituminous materials containing natural rubber and their relation to road performance (Thompson=PD); a method of improving the viscous flow properties of tars for use as road binders (Brooks=JD and Smith=JW); a comparative study of the chemical and physical properties of petroleum with coal tars and bitumens (Harrisson=RJ).]]></description>
      <pubDate>Fri, 24 Aug 2012 23:38:31 GMT</pubDate>
      <guid>https://trid.trb.org/View/1209106</guid>
    </item>
    <item>
      <title>A method of improving the viscous flow properties of tars for use as road binders</title>
      <link>https://trid.trb.org/View/1209089</link>
      <description><![CDATA[Heavy tars and soft pitches such as are normally obtained from gasworks vertical retort tar have a high temperature coefficient of viscosity. Materials which may be more suitable for road binders, in that they have a lower temperature coefficient of viscosity similar to that of bitumen, are obtained if 10 per cent of coal is added to the tar before distillation. The mechanism of action of the coal has been investigated and is discussed (A).]]></description>
      <pubDate>Fri, 24 Aug 2012 23:38:06 GMT</pubDate>
      <guid>https://trid.trb.org/View/1209089</guid>
    </item>
    <item>
      <title>Bituminous materials: asphalts, tars, and pitches; volume 3 coal tars and pitches</title>
      <link>https://trid.trb.org/View/1181687</link>
      <description><![CDATA[]]></description>
      <pubDate>Fri, 24 Aug 2012 03:32:55 GMT</pubDate>
      <guid>https://trid.trb.org/View/1181687</guid>
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