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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>
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      <title>Transport Research International Documentation (TRID)</title>
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      <link>https://trid.trb.org/</link>
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      <title>Grusslitlager och stödremsa med filler från asfalttillverkning</title>
      <link>https://trid.trb.org/View/2598664</link>
      <description><![CDATA[This report addresses challenges with gravel wearing courses, which are now primarily made from crushed rock instead of natural gravel. This shift has resulted in 70-80% of materials failing to meet the Swedish Transport Administration's specifications, mainly due to a lack of fine material and clay-key components for stability, density, and resistance to surface softening. At the same time, asphalt production generates a surplus of filler, which is often discarded. The project proposes using this surplus to improve gravel wearing courses by compensating for the lack of fine material. The aim is to study how different filler levels affect the performance and quality of gravel wearing courses and to develop a cost-effective, consistent production method. The study includes lab tests and field trials using materials from various rock quarries. Results show that materials without filler do not meet grain size requirements, but filler addition can correct this. Filler also reduces permeability, improving resistance to water infiltration. A new method for mixing moist filler into production proved effective, yielding a homogeneous material with the desired filler content. Field trials on road 2227 in Dalsland showed that sections with filler had slightly better surface quality and fewer potholes after one year, with no significant differences in loose gravel or unevenness.]]></description>
      <pubDate>Fri, 12 Sep 2025 10:19:49 GMT</pubDate>
      <guid>https://trid.trb.org/View/2598664</guid>
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    <item>
      <title>Investigating the Combined Effect of Active and Inert Filler on Rheological and Mechanical Performance of Asphalt Mastic and Asphalt Mixture</title>
      <link>https://trid.trb.org/View/2384671</link>
      <description><![CDATA[Filler, a fine powder used in asphalt mixture, plays a dual role as an inert filler to fill gaps between mineral aggregates and an active filler to mix with asphalt binder to generate a high-consistency asphalt mastic. This mastic is the main component of an asphalt structure that deforms when stress is applied and may significantly affect the mixture's physical and mechanical properties. This study compares the rheological and mechanical performance of asphalt mastics and asphalt mixtures fabricated by combining active and inert fillers containing modifiers and anti-stripping agents. This investigation used Styrene-Butadiene-Styrene (SBS) as modifiers and Zycotherm as liquid anti-stripping agents. Different proportions of Hydrated lime (HL) and Fly- ash (FA) were selected as active fillers, whereas different proportions of Limestone (LS), Dolomite (DM) and Basalt (BS) were selected as inert filler materials. The Marshall stability and flow test, Indirect Tensile Strength (ITS), and moisture damage evaluation tests were performed for the mechanical properties of the asphalt mixture. Based on the mastic and mixture level analysis, combined effect of HL and LS modified with SBS containing Zycothenn was predominant and satisfied all the rutting and creep recovery performance requirements.]]></description>
      <pubDate>Thu, 13 Jun 2024 09:46:17 GMT</pubDate>
      <guid>https://trid.trb.org/View/2384671</guid>
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      <title>Performance of Aged Asphalt Mastic Combining Active and Inert Filler Materials in Terms of Creep Recovery</title>
      <link>https://trid.trb.org/View/2301616</link>
      <description><![CDATA[Mastic is the main component of an asphalt structure that deforms when stress is applied. Substantial research has been done on the deformation and creep and recovery characteristics of asphalt mastic with varying filler proportions to develop a rheological parameter. Few research, however, has examined the combined impact of active and inert fillers. This study compares the creep recovery performance of asphalt mastics fabricated with the combination of different active and inert fillers containing modifier and anti-stripping agent. To understand the creep recovery characteristics of aged asphalt mastic, an experimental campaign of Multiple Stress Creep Recovery (MSCR) tests following AASHTO T 350 was performed using the Dynamic Shear Rheometer (DSR). This investigation used Styrene-Butadiene-Styrene (SBS) as modifiers to modify the neat PG 58-28 binder and Zycotherm as liquid anti-stripping agent. For fabricating the mastics, different proportions (10%,20%,30% by the weight of base binder) of Hydrated lime (HL) and Fly ash (FA) were selected as active fillers, whereas different proportions (70%,60%,50% by the weight of base binder) of Limestone (LS), Dolomite (DM) and Basalt (Ba) were selected as inert filler materials. The active and inert fillers were added in such a way that the Filler-Binder (F/B) ratio remains 0.8. Rolling Thin-Film Oven (RTFO) protocol was applied to simulate construction and laying time oxidative aging. The performance of these mastics was compared using non-recoverable creep compliance, stress sensitivity analysis, and percent recovery analysis. AASHTO M 332 specifications have been used to classify all the mastics based on the Jnr value at 3.2 kPa and stress sensitivity. In addition, polymer method MSCR curve specified by the Asphalt Institute (AI) were employed to interpret the test results. Based on the analysis of experimental data, active filler HL produced better creep recovery performance compared to FA, and when combined with inert filler LS, it showed the best performance. The combined effect of 10%HL and 70%LS modified with SBS containing Zycotherm was predominant and satisfied all the creep recovery performance requirements.]]></description>
      <pubDate>Mon, 04 Dec 2023 16:47:37 GMT</pubDate>
      <guid>https://trid.trb.org/View/2301616</guid>
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    <item>
      <title>Heating Longitudinal Joints with Infrared Heaters to Improve Performance The City of Calgary’s Joint Density Specification</title>
      <link>https://trid.trb.org/View/2301603</link>
      <description><![CDATA[Premature longitudinal joint failures due to low density, water intrusion, cracking, and ravelling is a common and significant issue in asphalt roadways. Joints often fail first despite the rest of the mat being constructed properly with suitable mixes. Premature joint deterioration reduces the pavement's life cycle and requires increased maintenance, wastes time, budget, environmental and safety concerns due to traffic accommodation. In 2021 and 2022, the city conducted pilot studies using infrared heaters during paving to create heated joints. The city is continuing its study through 2023. To facilitate implementation of the joint density specification and to evaluate the overall effectiveness, the contractor was required to heat the construction joint using an infrared joint heater supplied by Heat Design Equipment in 2021. Preliminary results were encouraging with improved densities and reduction in air voids. As such, the City decided to proceed with the joint density specification on contracts in 2022/2023. This paper presents the preliminary results of the longitudinal heated joints from the City's 3-year study, including the development of specifications, best construction practices, challenges, and maintenance. The city plans to continue heating joints, particularly on high-volume roadways and multi-lane pavements, and further improve the current specifications.]]></description>
      <pubDate>Mon, 04 Dec 2023 16:47:25 GMT</pubDate>
      <guid>https://trid.trb.org/View/2301603</guid>
    </item>
    <item>
      <title>BVFF Grusslitlager och stödremsa med inblandning av filler från asfaltstillverkning</title>
      <link>https://trid.trb.org/View/2269688</link>
      <description><![CDATA[The project aims to improve the construction of road construction materials of crushed rock. This applies in particular to materials for gravel road surface layers and support strips that are dependent on (relatively) high fine grain levels. Usually, a mixture of fine material is required for crushed rock to meet TrV's requirements for fine grain content. The fine material provides gravel wear layers: tightness, the bondage, moisture-retaining properties (against dusting). In the production of asphalt, excess filler occurs. This surplus is difficult to find a provision for. For a more sustainable construction of civil engineering infrastructure, a more resource-efficient use of this surplus is needed. The project will solve the problem by: Developing a number of recipes for mixtures; Evaluating them after laboratory tests; Selecting appropriate suggestions; Producing materials at full scale; Building test routes; Evaluating the test routes. The result will lead to knowledge of how the function of materials for gravel wear bearings and support strips changes with different levels of involvement of excess fillers from asphalt plants. The knowledge can be used to revise existing requirements in case the result shows that sufficient or improved function is obtained through interference. Suppliers of aggregate can use the knowledge to make better use of the surplus of fine materials. The project will lead to knowledge of a cost-effective production method for the involvement of filler.]]></description>
      <pubDate>Mon, 16 Oct 2023 09:26:07 GMT</pubDate>
      <guid>https://trid.trb.org/View/2269688</guid>
    </item>
    <item>
      <title>BeFo 446 - Deformation i sprickor nära tunnelkonturen och dess påverkan på injektering</title>
      <link>https://trid.trb.org/View/2269685</link>
      <description><![CDATA[In tunnelling, pre-grouting is used to seal water-bearing fractures that can lead ingress into the tunnel. When the tunnel face advances, deformations in the rock mass are successively developed as the support from the face is reduced. How far the deformations will spread in the rock mass depend on rock quality and orientation of fractures. Deformations that occur in the grouted zone can impact the result of the pre-grouting. The goal of this project is to study how deformations in the rock mass close to the tunnel, principally deformation along fractures, can affect the pre-grouting. The focus will be on how fracture orientations will influence the deformations, and how changes in aperture will influence the ingress into the tunnel. The problem will be studied with two-dimensional numerical modelling, where the advance of the tunnel face is implicitly modelled with a reduction of the internal pressure. The results will aid in decision making of e.g. look-out, overlap and grout spread in the grouting design.]]></description>
      <pubDate>Mon, 16 Oct 2023 09:26:05 GMT</pubDate>
      <guid>https://trid.trb.org/View/2269685</guid>
    </item>
    <item>
      <title>Experimental study of a self-expanding filling material for mine-sealing walls</title>
      <link>https://trid.trb.org/View/2145625</link>
      <description><![CDATA[]]></description>
      <pubDate>Mon, 03 Apr 2023 16:37:32 GMT</pubDate>
      <guid>https://trid.trb.org/View/2145625</guid>
    </item>
    <item>
      <title>Spherical indentation technique for multiscale characterisation of asphalt mixtures</title>
      <link>https://trid.trb.org/View/2075223</link>
      <description><![CDATA[The viscoelastic properties of asphalt mixtures strongly influence the performance of flexible pavements with respect to their resistance to several common distress modes. Therefore, accurate measurement of these properties and their change during the service life is an important area of ongoing research. Despite considerable progress in this field, certain questions are still not fully resolved. In particular, commonly used experimental methods cannot be applied for the viscoelastic characterisation of thin asphalt layers and asphalt overlays. Moreover, measuring the viscoelastic properties of the downscaled sub-phases of asphalt mixtures, such as mastic or mortar, in the field remains a challenge. Understanding the viscoelastic properties of those sub-phases is crucial for gaining fundamental insight into the mixture performance. In this context, advanced and computationally efficient micromechanical models are also needed in order to establish the quantitative link between the viscoelastic properties of asphalt mixtures and of their sub-phases. This thesis aims to contribute to this important area through the development of new experimental and modelling tools for the multiscale characterisation of asphalt mixtures. In this thesis, a new micromechanical modelling approach for bitumen-aggregate composites is proposed and used to investigate the mechanical behaviour of mastic, mortar and asphalt mixtures. To achieve computational efficiency, the proposed approach is based on a simplified, computer-generated representation of materials internal structure and utilises periodic boundary conditions to reduce the representative volume element size. Based on the Dynamic Shear Rheometer (DSR) measurements, it is shown that the proposed model can capture the measured viscoelastic behaviour of mastics for the range of loading, temperature and material parameters examined. For the modelling of mortar and asphalt mixtures, the multiscale approach is applied in order to improve computational efficiency. Obtained computational results indicate that the developed approach is capable of capturing the mixtures’ macro-scale viscoelastic properties with reasonable accuracy.]]></description>
      <pubDate>Fri, 02 Dec 2022 11:41:20 GMT</pubDate>
      <guid>https://trid.trb.org/View/2075223</guid>
    </item>
    <item>
      <title>Influence of herbal and mineral fillers on physical and rheological properties of bitumen</title>
      <link>https://trid.trb.org/View/1857864</link>
      <description><![CDATA[]]></description>
      <pubDate>Tue, 08 Jun 2021 12:31:47 GMT</pubDate>
      <guid>https://trid.trb.org/View/1857864</guid>
    </item>
    <item>
      <title>Nedbrytning hos betongprovkroppar med slagg, flygaska och kalkstensfiller efter 4 vintersäsonger vid Rv 40</title>
      <link>https://trid.trb.org/View/1748864</link>
      <description><![CDATA[The purpose of this project is determine the degree of degradation of concrete mixtures with slag, fly ash and limestone after 4 years of road exposure at Rv40. The results from field exposed specimens are compared with laboratory tests of the salt freeze resistance on specimens from the same mixtures. These tests were carried out in previous research projects. In addition to further knowledge of degradation in concrete with slag, fly ash and limestone fillers in the road environment, this will provide indications of the existing test method (CEN / TS 12390-9, scaling, and SS137244) applicability and possible improvement needs. Within the previous project, only measurement of the decomposition of the 14 mixtures was held after a winter's exposure at Rv40. After 4 years it should be possible to get indications of how the salt freeze resistance varies in the 14 mixtures that were done in 2014 and 2015 and how this correlates with the results of the laboratory tests. Repeated measurements are proposed after a further 3 + 3 years. Funding for this is requested separately when applicable. On the field samples, the external and internal degradation of the specimens will be recorded by measuring volume change, self-frequency change and ultrasonic measurement. Depending on the degree of degradation, some specimens may be analyzed by other methods, e.g. microscopy, chloride measurement, carbonation measurement or the like. The results will be used in regulations and ama. The hope is that concrete with fly ash and slag gives equivalent results as concrete with pure Portland cement. This would ensure the use of cement that produces less CO 2 emissions.]]></description>
      <pubDate>Mon, 02 Nov 2020 14:09:06 GMT</pubDate>
      <guid>https://trid.trb.org/View/1748864</guid>
    </item>
    <item>
      <title>Evaluation of Asphalt Pavement Crack Sealing</title>
      <link>https://trid.trb.org/View/1657704</link>
      <description><![CDATA[Crack sealing is one of the most commonly used routine maintenance treatments for road and airport asphalt pavements. Asphalt pavement performance monitoring shows that properly completed, timely crack sealing can significantly extend the service life of asphalt pavements.  Recent practical experience in Ontario (road and highway pavements) and Newfoundland (airport pavements) shows that crack sealant failures (debonding) can occur in asphalt pavements that incorporate aggregates that are hard, brittle, and prone to stripping.  This paper presents the results of extensive research on crack sealant performance in asphalt pavements, completed on several Canadian road and airport projects where poor crack sealant performance had been observed. It presents recommendations for changes in crack sealing methods to achieve improved pavement performance and more cost-effective asphalt pavement crack sealing.]]></description>
      <pubDate>Mon, 07 Oct 2019 14:55:09 GMT</pubDate>
      <guid>https://trid.trb.org/View/1657704</guid>
    </item>
    <item>
      <title>High-quality materials for road paving of natural stone: results of the PREMANAT research project</title>
      <link>https://trid.trb.org/View/1656140</link>
      <description><![CDATA[The prenormative research project PREMANAT (Performance requirements for materials in natural stone paving) started on 1 October 2016 in collaboration with the WTCB and with support from the FPS Economy and the NBN. The main objective of this study was to establish test methods and performance requirements for materials used in natural stone pavements, and to do so in various areas that are considered a priority by the industry. This article discusses the results of this research.]]></description>
      <pubDate>Wed, 02 Oct 2019 09:52:49 GMT</pubDate>
      <guid>https://trid.trb.org/View/1656140</guid>
    </item>
    <item>
      <title>The effect of filler type and content on rutting resistance of asphaltic materials</title>
      <link>https://trid.trb.org/View/1635366</link>
      <description><![CDATA[This research evaluates the effect of filler type and content on rutting resistance of asphaltic materials by using laboratory experiments. To examine the effect of filler type, two traditional fillers (Silica sandstone powder and Portland cement) and a new recycled lime powder (Eggshell) were considered. To investigate the effect of filler content, three different filler contents were used. Marshall Stability test was performed on full mixes in order to determine the optimum binder content of the mixtures. Then, the static creep test was performed on Fine Aggregate Matrix (FAM) samples. The permanent strain after 10 minutes of recovery (PS-660) was considered as the indicator of potential to rutting. It was shown that PS-660 has a good correlation with total strain after 60 seconds of loading (TS-60), permanent strain after 60 seconds of recovery (PS-120), the slope of the primary (θ1) and secondary (θ2) Phases of the creep curve, binder percent of FAM samples (B%), as well as with Marshall Quotient (MQ) value of full mixes. The test results clearly demonstrated that both filler type and content can significantly influence rutting resistance of asphaltic materials.]]></description>
      <pubDate>Wed, 14 Aug 2019 14:31:32 GMT</pubDate>
      <guid>https://trid.trb.org/View/1635366</guid>
    </item>
    <item>
      <title>Laboratory Investigation on Self-Healing Properties of Asphalt Mortar with Different Types of Filler</title>
      <link>https://trid.trb.org/View/1572852</link>
      <description><![CDATA[The self-healing of asphalt materials has been a hot topic recently. Most of the previous studies have focused on the healing modifier, mechanism and modeling. Limited work has been accomplished to fully understand the healing performance of asphalt mortar with different filler types and ratios. Nowadays, plenty of fine solid wastes with extremely different physical and chemical properties have been used as alternative fillers to limestone powder. This study aims to analyze the effects of different filler types and varied ratios on self-healing capability of the asphalt mortar. Firstly, seven types of filler (limestone, fly ash, diatomite and four types of red mud) were mixed to prepare thirty-five groups of asphalt mortar with different filler-bitumen ratios by volume. Secondly, the rheological properties of asphalt mortar were investigated through Brookfield Viscosity and Multiple Stress Creep Recovery. Thirdly, this study examined the effect of each filler type and its ratio on the adhesion and self-healing performance. Lastly, Hamburg Wheel Tracking Test (HWTT) was performed to evaluate the moisture damage and rutting resistance of asphalt mixture with different types of filler. The results indicate that pull-off tensile strength after the first failure-healing cycle in water condition has a good linear relationship with the dynamic stability of asphalt mixture in HWTT. Moreover, chemical components of filler play a crucial role in the performance of asphalt mortar and mixture. Finally, red mud can be used as a promising alternative filler to limestone powder, while its chemical components need to be carefully selected.]]></description>
      <pubDate>Sat, 02 Mar 2019 15:41:14 GMT</pubDate>
      <guid>https://trid.trb.org/View/1572852</guid>
    </item>
    <item>
      <title>Effects of Fine Solid Waste as Alternative Filler on Asphalt Mortar</title>
      <link>https://trid.trb.org/View/1572858</link>
      <description><![CDATA[Asphalt and filler interaction plays a key role in the performances of asphalt mastics and mixtures, while the interaction ability of asphalt and filler is in turn affected by the material characteristics. Nowadays, plenty of fine solid waste with extremely different physical and chemical properties have been used as alternative filler to limestone powder. This study analyzed the effects of filler characteristics on asphalt mortar and the feasibility of re-use of the fine solid waste. Firstly, four types of filler (limestone, fly ash, diatomite and red mud) were used to prepare twenty types of asphalt mortar with different fillers to bitumen ratio by volume (0.11, 0.22, 0.33, 0.44, and 0.55). Secondly, the rheological properties of asphalt mortar were examined through Brookfield Viscosity, Superpave high-temperature binder criteria G*/sin δ, and Multiple Stress Creep Recovery. Thirdly, this study investigated the effect of filler type and filler-bitumen ratio (FBv) by volume method to adhesion performance in water and dry condition. Finally, a critical of FBv range was recommended in view of the overall performance. The results indicated that the performance of asphalt mortar with red mud and diatomite exhibited improvement in the high-temperature performance and adhesion ability in case of dry and water conditions. Hence, red mud and diatomite can be used as alternative filler to limestone powder.]]></description>
      <pubDate>Sat, 02 Mar 2019 15:41:12 GMT</pubDate>
      <guid>https://trid.trb.org/View/1572858</guid>
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