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    <title>Transport Research International Documentation (TRID)</title>
    <link>https://trid.trb.org/</link>
    <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>
      <url>https://trid.trb.org/Images/PageHeader-wTitle.jpg</url>
      <link>https://trid.trb.org/</link>
    </image>
    <item>
      <title>A new prediction strategy on the taut mooring system for FPSO considering dynamic stiffness of polyester ropes by long short-term memory method</title>
      <link>https://trid.trb.org/View/2627194</link>
      <description><![CDATA[A LSTM-based mooring tension prediction strategy is proposed and its effectiveness is validated through comparative analysis with Quasi-dynamic methods. Numerical simulation data from 16 chain-polyester-chain mooring lines on an FPSO were employed, with motion and tension data from Lines 2 and 14 serving as the training dataset. The model successfully achieved cross-line prediction across other seven adjacent lines, demonstrating its generalization capability through spatial material response correlations and geometric symmetry-enabled parameter sharing. Results show that Prediction Strategy B maintains comparable prediction accuracy to Prediction Strategy A while reducing data requirements and computational load. Spatial analysis reveals a distance-dependent attenuation pattern in prediction errors, with lines adjacent to Line 2 exhibiting lower errors compared to distal lines. Pretension shows a positive correlation with prediction accuracy, where increased tensions enhance model robustness through geometric constraint reinforcement. The study also revealed that polyester rope’s dynamic stiffness on the tension prediction in Prediction Strategy B cannot be neglected, while wave parameters Hs and Tp exhibit monotonic negative impacts on prediction accuracy. Based on these findings, it is indicated that Prediction Strategy B is projected to enhance prediction accuracy during extreme sea states, establishing an improved framework for intelligent monitoring of symmetric mooring systems.]]></description>
      <pubDate>Thu, 29 Jan 2026 17:01:37 GMT</pubDate>
      <guid>https://trid.trb.org/View/2627194</guid>
    </item>
    <item>
      <title>Preparation methodology and performance of methyl methacrylate modified unsaturated polyester resin mortar for thin layer repair</title>
      <link>https://trid.trb.org/View/2643587</link>
      <description><![CDATA[The airport pavement will be gradually damaged, seriously affecting the takeoff and landing of aircraft. . This study developed methyl methacrylate (MMA) modified unsaturated polyester resin (UPR) mortar as a high-performance and low-cost thin layer repair material for airport pavement. Firstly, the optimum formula of repair mortar was determined according to the influences of the formula on its many properties. Subsequently, the performance and interlayer bonding strength of MMA modified UPR mortar were evaluated and compared with that of pure UPR mortar and acrylic resin mortar. Lastly, the modification mechanism was explored using SEM and FTIR. The results indicate that the optimal gradation index of MMA modified UPR mortar is 0.3, with an optimal sand-binder ratio of 1.4, and the optimal contents of MMA, initiator, accelerator, diluent and plasticiser of 15%, 1%, 1%, 10% and 1.5% of the resin mass, respectively. Compared with pure UPR mortar, the performance of MMA modified UPR mortar has been greatly improved. Compared with acrylic resin mortar, the performance of MMA modified UPR mortar also shows greater superiority. Due to the interpenetrating network structure formed by chemical reaction between MMA and UPR, the fracture mode of UPR changes from brittle fracture to ductile fracture.]]></description>
      <pubDate>Mon, 05 Jan 2026 14:53:16 GMT</pubDate>
      <guid>https://trid.trb.org/View/2643587</guid>
    </item>
    <item>
      <title>Properties and self-healing effect of shape memory polyurethane-based sealant for cement concrete pavement joint</title>
      <link>https://trid.trb.org/View/2609030</link>
      <description><![CDATA[To develop smart sealant with shape memory and self-healing properties for cement pavement joint, silicon dioxide (SiO₂) was incorporated into shape memory polyurethane (SMPU) to enhance its shape memory and mechanical properties, and polycaprolactone (PCL) was added to improve its self-healing function. The composite was programmed to endow two-dimensional (2D) shape memory performance for using as joint sealant. The excitation response temperature of unprogrammed PCL/SiO2₂SMPU was determined as 71 ℃. The phase structure, viscoelastic performance, 2D shape memory, mechanical and repeated self-healing properties of joint sealant were investigated. The results show that PCL and SMPU are physically mixed. The added PCL does not significantly affect the phase transition temperature of SMPU, but causes a slight decrease in the crystallinity of joint sealant. The optimal dosage of PCL increases storage modulus and loss modulus of joint sealant, ensuring sufficient shape recovery ability and viscosity for shape memory and self-healing. The shape memory performance of joint sealant is a prerequisite for its self-healing function. Inadequate PCL does not perform sufficient self-healing properties, while excessive PCL reduces the mechanical properties of joint sealant. The smart joint sealant containing 10 wt% PCL exhibits the best mechanical, viscoelastic, shape memory, and self-healing properties. The self-healing rate reaches 61.03 %, and even after five loading-healing cycles, the self-healing rate is still 30.17 %. After self-healing, the micro-crack in joint sealant is almost completely healed. Joint sealant can maintain good performance even after multiple damage-healing cycles. The smart joint sealant can enhance the durability of joint and extend the service life of concrete pavement.]]></description>
      <pubDate>Thu, 18 Dec 2025 09:38:49 GMT</pubDate>
      <guid>https://trid.trb.org/View/2609030</guid>
    </item>
    <item>
      <title>Study on the characteristics and performance of nano-silica/unsaturated polyester resin composite modified asphalt waterproof adhesive layer</title>
      <link>https://trid.trb.org/View/2607288</link>
      <description><![CDATA[The waterproof adhesive layer (WAL) is a critical structure that effects the service life of bridge deck pavement. However, ordinary asphalt-based WAL materials commonly suffer from significant degradation of bond strength at high temperatures, leading to functional failure. To address this issue, this paper developed a novel WAL material by compositely modifying asphalt with nano-silica (NS) and unsaturated polyester resin (UPR). Subsequently, a comprehensive analysis of the composite modification effects of NS/UPR and the performance of composite modified asphalt as a WAL material was conducted through a series of experimental tests. The results indicated that the optimal mass ratio for the NS/UPR composite modified asphalt was coupling agent: NS: UPR: initiator: asphalt: compatibilizer = 3:3:100:4:282:4. The incorporation of NS promoted the uniform dispersion of UPR within the asphalt matrix, enhancing the toughness and high-temperature stability of the modified asphalt while mitigating the adverse impact of UPR on low-temperature cracking resistance. In terms of adhesion performance, the pull-off strength of the NS/UPR composite modified asphalt was 1.59 and 1.48 times that of the matrix asphalt and SBS modified asphalt, respectively. Durability tests further confirmed its superior weather resistance and ability to endure a greater number of load cycles. Overall, the novel WAL material developed in this paper demonstrated excellent adhesion performance at elevated temperatures together with favorable comprehensive properties, which expanding the potential applications of UPR in road engineering.]]></description>
      <pubDate>Mon, 24 Nov 2025 10:23:28 GMT</pubDate>
      <guid>https://trid.trb.org/View/2607288</guid>
    </item>
    <item>
      <title>Experimental study on creep and abrasion properties of polyester yarns for deep-sea mooring applications</title>
      <link>https://trid.trb.org/View/2599138</link>
      <description><![CDATA[Polyester ropes are increasingly vital in deep-sea mooring systems due to their lightweight, high strength, and excellent fatigue resistance. However, the creep rupture and yarn-on-yarn abrasion properties of polyester yarns under high-load dynamic conditions remain insufficiently studied. This research conducted comprehensive experiments on polyester yarns tailored for deep-sea mooring, evaluating average creep rates and rupture times at 85 %–96 % Yarn Break Load (YBL) and abrasion failure cycles at 3.00 %–4.64 % YBL. Statistical analysis and empirical modeling revealed that average creep rates increase exponentially with load, while rupture times and abrasion failure cycles exhibit power-law decay with increasing load. Creep data were analyzed using geometric means, while abrasion data were processed with arithmetic means, achieving model correlation coefficients above 0.96, indicating robust predictive accuracy. These findings fill critical gaps in understanding polyester yarn creep and abrasion behavior, offering valuable quantitative insights for optimizing the design and enhancing the reliability of polyester ropes in deep-sea mooring applications.]]></description>
      <pubDate>Wed, 24 Sep 2025 15:31:06 GMT</pubDate>
      <guid>https://trid.trb.org/View/2599138</guid>
    </item>
    <item>
      <title>Experimental investigation on dynamic stiffness of full-scale polyester mooring ropes</title>
      <link>https://trid.trb.org/View/2549525</link>
      <description><![CDATA[In deep-sea mooring engineering, polyester fiber ropes are increasingly favored over steel ropes and chains for their lightweight and high strength, despite their mechanical nonlinearity and time-dependent dynamic stiffness. Previous research has largely overlooked the dynamic stiffness of full-scale 12-strand polyester ropes. This study conducts series of cyclic loading tests under diverse conditions to assess how average tension, tension amplitude, and loading period affect dynamic stiffness. Results show that dynamic stiffness increases with average tension but decreases with both tension amplitude and loading period. By analyzing cyclic loading data from the present experiments, combined with existing data, an empirical formula to predict dynamic stiffness across various polyester rope sizes and structures are developed. Additionally, an upper and lower bound equation is proposed to estimate the range of dynamic stiffness. Both formulas align well with experimental outcomes, demonstrating their practical utility in ocean engineering.]]></description>
      <pubDate>Tue, 10 Jun 2025 16:04:10 GMT</pubDate>
      <guid>https://trid.trb.org/View/2549525</guid>
    </item>
    <item>
      <title>Quality Improvement of Off-Spec Coarse Aggregates with the Use of Unsaturated Polyester Resin</title>
      <link>https://trid.trb.org/View/2549194</link>
      <description><![CDATA[This study aims to modify off-spec limestones using resin to enhance their mechanical properties. The modified limestones are intended for road construction. The mechanical properties are accessed through Aggregate Crushing Value (ACV), Aggregate Impact Value (AIV), Los Angeles (LA) abrasion, water absorption, and microstructure analyses. Then, the modified limestones are exposed to deterioration to resemble real-life altering conditions on highways. The exposure conditions consist of the direct immersion of water, 3% NaCl solution, and 1% HCl solution, and thermal stress cycles. This was followed by quality test analyses for comparisons and inferences. The samples were immersed in water, NaCl solution, and HCl solution for 63 days, with each cycle consisting of 3 days of immersion and four days of air drying. Nineteen thermal stress cycles were carried out, with 18 hours of immersion in NaCl solution and 6 hours of heating in an oven at 60 degrees. The findings show significant improvement in crushing value, impact value, and abrasion resistance of aggregates after surface treatment with resin. Microstructure analyses using SEM revealed that the treated limestone had a rougher surface texture, indicating enhanced bonding in concrete, facilitating chemical reactions, improving mechanical interlocking, and ultimately enhancing the overall performance and durability of the concrete structure.]]></description>
      <pubDate>Wed, 28 May 2025 10:11:33 GMT</pubDate>
      <guid>https://trid.trb.org/View/2549194</guid>
    </item>
    <item>
      <title>Effects of bedding-in loading history on mechanical behaviors of aramid HMPE and polyester mooring ropes</title>
      <link>https://trid.trb.org/View/2495608</link>
      <description><![CDATA[This study investigates the effects of bedding-in loading history on the mechanical behaviors of aramid, HMPE, and polyester mooring ropes. Bedding-in process led to densification of the rope internal structure and a more uniform fiber alignment, which in turn improved the static stiffness of the ropes. The series of tests showed that bedding-in significantly increased the dynamic stiffness of fiber rope samples. In addition, the difference between ropes with and without bedding-in loading history diminishing as the number of loading cycles and loading duration increased. Furthermore, an empirical formula was developed to quantify dynamic stiffness, incorporating mean load, load amplitude, and loading cycles. The formula demonstrated accuracy and reliability in predicting the dynamic stiffness of rope samples. The present study suggests that bedding-in effect should be considered to design and optimize the fiber mooring systems in engineering applications.]]></description>
      <pubDate>Fri, 21 Mar 2025 09:03:38 GMT</pubDate>
      <guid>https://trid.trb.org/View/2495608</guid>
    </item>
    <item>
      <title>Dynamic stiffness of full-scale damaged polyester mooring ropes</title>
      <link>https://trid.trb.org/View/2509731</link>
      <description><![CDATA[To investigate the dynamic stiffness of full-scale polyester ropes, an experimental study was conducted using a new designed large-tonnage rope testing equipment. A testing procedure for assessing the dynamic stiffness of damaged full-scale fiber ropes was proposed, where the damage level was induced by cutting the rope components. Experimental results revealed that for polyester mooring ropes with damage levels, dynamic stiffness increases with mean load but decreases as the increase of load amplitudes, loading periods, and damage levels. Based on these results, an empirical expression was developed to account for the combined effects of damage levels, mean load, load amplitude, and load periods on the dynamic stiffness of full-scale polyester mooring ropes. This equation aims to enhance the understanding of the impact of damage on rope performance, thereby improving the service safety of polyester fiber ropes in mooring engineering applications.]]></description>
      <pubDate>Wed, 19 Feb 2025 17:11:57 GMT</pubDate>
      <guid>https://trid.trb.org/View/2509731</guid>
    </item>
    <item>
      <title>Polyester mooring system design and evaluation of a semi-platform in South China Sea</title>
      <link>https://trid.trb.org/View/2465265</link>
      <description><![CDATA[Polyester rope offers numerous advantages over traditional steel catenary mooring systems and is considered an appealing option for deep-water mooring systems. In this paper, the design and evaluation procedure of the polyester mooring system for a semi-submersible platform located in the South China Sea is presented. A fully coupled numerical model of the semi-submersible platform, including all risers and mooring lines, has been established and calibrated through wave basin testing. To simulate the elongation behavior of polyester, a static-dynamic stiffness model is employed, and the corresponding procedure for mooring evaluation is established to simulate the mooring response under extreme environmental conditions. A comprehensive fatigue analysis is also conducted for the polyester mooring system using time domain dynamic theory. The effects of Vortex-Induced Motion (VIM) on mooring fatigue damage are also considered. The results indicate that the polyester mooring system could be safely operated at the target offshore field throughout its service life. Additionally, model test calibration is a crucial procedure during the entire mooring evaluation process, and the numerical model should be adjusted appropriately to accurately reflect the dynamic behavior of the coupled system. This study also illustrates that the stiffness of the rope plays a crucial role in polyester mooring design and global performance calculations. The proposed evaluation methodology can provide a foundation for the design of polyester mooring systems and for evaluating their safety and reliability in engineering practice.]]></description>
      <pubDate>Thu, 19 Dec 2024 11:47:22 GMT</pubDate>
      <guid>https://trid.trb.org/View/2465265</guid>
    </item>
    <item>
      <title>Recycle Solutions That Make Environmental, Economic $en$e</title>
      <link>https://trid.trb.org/View/1786870</link>
      <description><![CDATA[The Auto Industry has clearly defined itself a role in environmental stewardship and challenged the supply chain to support the stewardship with the objective of avoiding landfills. At the same time challenges remain: Collection, identification and sorting; Processing waste streams into reusable raw materials; and Convincing the industry supply chain that these raw materials will not negatively impact supply, product reliability and cost. This paper will address how DuPont is facing these challenges in concert with its customers in the automotive supply chain. It will focus on several key technologies applied to polyester (PET), nylon 6 and nylon 66: The traditional mechanical recycling technology; and The innovative chemical recycling technology.]]></description>
      <pubDate>Thu, 07 Nov 2024 11:52:24 GMT</pubDate>
      <guid>https://trid.trb.org/View/1786870</guid>
    </item>
    <item>
      <title>Composite materials, technologies and manufacturing: current scenario of European Union shipyards</title>
      <link>https://trid.trb.org/View/2431550</link>
      <description><![CDATA[This paper provides the results and the analysis of a study conducted on the processes and technologies currently used by European Union shipyards, and their potential interest in new advanced composite construction technologies, including Adaptive Moulds, Automated Tape Laying, Automated Fibre Placement, Curved Pultruded Profiles, Additive Manufacturing, Hot Stamping, Modular and Serialised Shipbuilding and Digitisation of Production. A new set of indexes are also introduced with the objective of facilitating the evaluation of the technological level of the shipyard, thereby allowing the understanding of the shipyard's interest in new developments. The analysis of the survey conducted shows that almost the 95% of shipyards either currently use or plan to use composite materials, being the composites made of fibreglass and polyester resin the most used. These composites are mainly manufactured by manual lamination and vacuum infusion techniques. The survey has also shown that there is a high interest in the shipyard digitisation and the use of new technologies in the shipbuilding industry, especially for new construction shipyards. The study shows that despite shipyards want to adopt digitisation in engineering and design processes, implementation of new technologies and concepts is being held back by financial cost and uncertainty regarding outcomes such as improved operational efficiency of vessels. The shipyards that do not use composites are less technologically advanced than those that use them, according to the analysis of the technological indexes. This analysis has also shown that the shipyards with a high technological index have a more varied potential market offer.]]></description>
      <pubDate>Thu, 19 Sep 2024 16:59:17 GMT</pubDate>
      <guid>https://trid.trb.org/View/2431550</guid>
    </item>
    <item>
      <title>Multi-objective optimization, shrinkage and fracture properties of unsaturated polyester resin modified concrete for bridge deck pavement based on system theory</title>
      <link>https://trid.trb.org/View/2416218</link>
      <description><![CDATA[For the purpose of fabricating unsaturated polyester modified concrete (UPMC) with excellent shrinkage and fracture properties for bridge deck pavement, the optimization design of mix proportion and enhancement mechanism analysis were implemented based on system theory. Firstly, for unsaturated polyester resin (UPR) subsystem, the viscosity, mechanical properties and droplet-size distribution were analyzed to determine the types and dosage of auxiliary additives after emulsification treatment; Next, for UPMC mortar slave-system, the optimization design was implemented through the combination of experimental analysis and hybrid multi-attribute ellipsoidal decision of grey-target (HMEDG) model; Subsequently, for UPMC main-system, the optimal proportion was determined utilizing orthogonal design test. Finally, the variation law and enhancement mechanism on fracture properties and shrinkage characteristics of UPMC was analyzed by combining macroscopic test, thermogravimetry (TG) and X-ray diffraction (XRD). The results demonstrated that 2.0 wt%BPO+1.0 wt%DMA and meta-benzene types UPR were utilized as auxiliary additives for UPMC based on the results of HMEDG models. The demulsified and cured WUP might supplement the interior moisture losses based on humidity compensation, and substantially constrain the evaporation loss inside the matrix, upgrading the hydration degree and facilitating the generation of hydration products. The introduction of 3 %-6 % waterborne-UPR (WUP) would improve 28d-fracture toughness within approximately 23.33 %-49.32 %, and reduce the shrinkage deformation by roughly 28–43 % through inducing the crack tip stress redistribution against the initiation and propagation of interior microcracks and enhancing the homogenization and densification.]]></description>
      <pubDate>Fri, 06 Sep 2024 16:58:27 GMT</pubDate>
      <guid>https://trid.trb.org/View/2416218</guid>
    </item>
    <item>
      <title>Effect of Fiber Content on Viscoelasticity of Asphalt Concrete</title>
      <link>https://trid.trb.org/View/2280111</link>
      <description><![CDATA[An experimental investigation was conducted to analyze the viscoelasticity of polyester fiber reinforced asphalt concrete. The cylinder specimens of asphalt concrete contained 0, 0.15%, 0.2%, 0.25%, 0.3% polyester fibers by weight of asphalt concrete were tested on MTS810 by methods of uniaxial static compression creep test under 45 °C. Test results show that the creep response of fiber reinforced asphalt concrete is similar to that of conventional asphalt concrete except the difference of creep deformation. A viscoelastic model called "four-unit, five-parameter" is employed to describe creep characteristics of fiber reinforced asphalt concrete, in which the five parameters (E1,E2,η2,A,B) are determined from experimental result (E1,B,E2,η2) are sensitive to fiber contents, and relations of parameters and fiber contents are simulated in nonlinear fit. The new viscoelastic model including fiber content is to calculate the load process of test and to analyze the influences of fiber content on the viscoelastic property of asphalt concrete. The numerical results show good consistency with experimental data. The composite with 0.2% fiber shows the best result.]]></description>
      <pubDate>Wed, 28 Aug 2024 16:49:58 GMT</pubDate>
      <guid>https://trid.trb.org/View/2280111</guid>
    </item>
    <item>
      <title>Effect of polyester resin additive on the properties of asphalt binders and mixtures</title>
      <link>https://trid.trb.org/View/2366735</link>
      <description><![CDATA[The properties of AC-5 control asphalt binder, mixture containing the same asphalt were compared with the properties of AC-10 asphalt binder modified by 0.75%, 1%, 2%, and 3% of polyester resin (PR), mixture containing pure AC-10 and AC-10 modified by 0.75% of PR, respectively. Initial research was done to determine the physical properties of unmodified and PR modified asphalt binders. The AC-10 asphalt binder modified by 0.75% of PR had good results compared to AC-5 control asphalt binder and all other modified binders, and hence this modified binder as well as unmodified binders were used to prepare Marshall samples for Marshall stability and flow, indirect tensile stiffness modulus (ITSM), indirect tensile strength (ITS) and creep stiffness tests. The results of investigation indicate that AC-10+0.75% PR binder has better physical properties than AC-5 control asphalt binder and, at the same time, PR improves mechanical properties of asphalt mixture.]]></description>
      <pubDate>Wed, 01 May 2024 17:18:21 GMT</pubDate>
      <guid>https://trid.trb.org/View/2366735</guid>
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