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    <title>Transport Research International Documentation (TRID)</title>
    <link>https://trid.trb.org/</link>
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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>
    <image>
      <title>Transport Research International Documentation (TRID)</title>
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      <link>https://trid.trb.org/</link>
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    <item>
      <title>Sustainable pavement solutions: Performance enhancement using high-dosage unequal-sized feldspar powder as a replacement for natural aggregates in cement stabilized macadam bases</title>
      <link>https://trid.trb.org/View/2487100</link>
      <description><![CDATA[Feldspar powder (FP), a novel by-product of lithium carbonate production with a particle size of less than 0.6 mm, has become a substantial industrial solid waste. Its large-scale landfilling not only increases disposal costs but also poses serious environmental risks. Given the high demand for aggregates in road construction, this study proposes using FP as a substitute for natural aggregates in cement stabilized macadam (CSM). To guarantee the pavement performance of mixes, previous studies predominantly employed equal-sized particle replacements of natural aggregates within standard gradation curves, limiting the disposal efficiency of industrial solid waste and resulting in the inefficient substitution efficiency for natural aggregates. This study surpassed the limitations of traditional standard gradation curves and proposed an innovative approach for the utilization of industrial waste. High-dosage unequal-sized FP was used to replace 0–5 mm natural aggregates in the production of cement stabilized feldspar powder macadam (CSFPM). Subsequently, a comprehensive evaluation was conducted on the pavement performance, microstructural mechanisms, and sustainability of CSFPM. Results showed that higher FP substitution rates, despite making its gradation curve surpassed the limit of standard gradation curves, enhanced key performance indicators, including compressive strength, splitting strength, drying shrinkage, and freeze–thaw resistance. Micro-mechanism analysis revealed that FP reacted with calcium hydroxide to form C–S–H gel, enhancing the mix's microstructure and mechanical properties. Incorporating 25 % FP reduced carbon emissions by 5.2 %, energy consumption by 22.5 %, and costs by 14.2 %, while complying with China's environmental standards. Thus, replacing natural aggregates with high-dosage, unequal-sized FP offers significant potential for improving both the mechanical performance and sustainability of road base materials.]]></description>
      <pubDate>Thu, 20 Feb 2025 16:25:54 GMT</pubDate>
      <guid>https://trid.trb.org/View/2487100</guid>
    </item>
    <item>
      <title>Impact of light mica on the intensity of the alkali-silica reactions in cement concrete pavements containing cataclased granite aggregates</title>
      <link>https://trid.trb.org/View/2481144</link>
      <description><![CDATA[The main goal was to determine the reaction potential of alkali-reactive aggregates containing unstable and metastable K-silicates together with quartz (predominant SiO₂ polymorph) for alkali-silica reactions (ASR) in cement concrete pavements. Current methods used to determine the expansion potential of aggregates do not solve these problems. The study of mineral paragenesis of cataclased granite by the SEM/EDX method shows that the differences in the microstructural and microchemical composition of ASR products in the cement matrix reflect the mineral variability of the rocks. The final products (crystals alkali-calcium aqueous silicates (NK)CSH), formed from alkali-silica gel (ASG), not only have different K₂O contents, but analysis of internal and external ASG led to the finding that the K₂O content is highest in cataclased granites with polymineral paragenesis (K-feldspar, light mica, quartz). The monomineral cataclased granite aggregate (crushed quartz only), its outer edge and air-voids have a significantly lower K content. The highest K₂O contents and at the same time lower CaO content were identified in ASGs appearing in paragenesis with light mica, and crushed feldspars. Based on the results presented in this work, it can be concluded that the presence of transformed feldspars and light mica significantly affect both the microchemical composition of ASR products and their crystalline product morphology.]]></description>
      <pubDate>Thu, 02 Jan 2025 10:14:31 GMT</pubDate>
      <guid>https://trid.trb.org/View/2481144</guid>
    </item>
    <item>
      <title>Sustainable utilization of feldspar powder from lithium extraction byproducts as road construction material</title>
      <link>https://trid.trb.org/View/2471755</link>
      <description><![CDATA[In order to reduce the storage cost and avoid environmental hazards of feldspar powder waste from lithium extraction byproducts, this work investigated the feasibility of ordinary silicate cement-stabilized feldspar powder-lateritic clay (FP-LC) composite as road construction material. Firstly, preliminary mix design of the new material was conducted to determine the optimum moisture content and maximum dry density. Subsequently, the effects of ratio of FP to LC on the mechanical properties of the composite were investigated through unconfined compressive strength (UCS), California bearing ratio (CBR) and shear strength tests. Finally, the strength formation mechanism of the FP-LC mixture was analyzed in combination with SEM and XRD testing. The results indicate that the UCS after 14 d curing, CBR and cohesive strength of FP simply stabilized by 6 % cement is 0.95 MPa, 87.3 % and 140.64 kPa, respectively, which can meet the requirements for subgrade materials. The addition of LC significantly improves the mechanical properties of the composite. The mass ratio of 40 % FP to 60 % LC results in the optimal UCS after 14 d curing, CBR and cohesive strength with 1.6 MPa, 164.1 % and 250.16 kPa, respectively, which makes it applicable as subbase materials for medium-light traffic levels. The particle closest packing analysis and SEM and XRD characterization demonstrated that the enhancement of UCS, CBR and shear strength comes from compact arrangement of FP and LC particles and the bonding effect of cement hydration products between them. This work proposes an eco-friendly and sustainable utilization approach of feldspar powder from lithium extraction byproducts as road construction material, which are important to overcome the challenges of both waste management and resource shortage for new energy and highway industries, respectively.]]></description>
      <pubDate>Mon, 30 Dec 2024 11:16:01 GMT</pubDate>
      <guid>https://trid.trb.org/View/2471755</guid>
    </item>
    <item>
      <title>Multi-scale study of the polishing behaviour of quartz and feldspar on road surfacing aggregate</title>
      <link>https://trid.trb.org/View/1563309</link>
      <description><![CDATA[In this paper, the exact mechanisms as to how petrographic properties of aggregate influence the polishing behaviour quantitatively were identified. Since the aggregate is composed of the different rock-forming minerals, the analyses conducted in this research project focused not only on the aggregate but also on crystals/minerals. The hardest and most abundant rock-forming minerals found on earth – quartz and feldspar – were investigated with polishing tests with the Aachen Polishing Machine on granite aggregates from four sources which exhibit different mineralogical properties. Changes of the aggregate texture and minerals were studied based on texture measurements and skid resistance measurements obtained by means of the Pendulum Test and the Wehner/Schulze device. The influences of mineral composition and crystal size on the changes of the micro-texture and skid resistance of the aggregates were determined by comparing the four granites. The polishing and wearing behaviour of quartz and various feldspars (albite, microcline and plagioclase) were characterised quantitatively by means of a spectral analysis and abrasion analysis. The results show that the micro-texture of exposed minerals is greatly smoothened on wavelengths from 100 to 500 μm. Fine-grained quartz or feldspar crystals tend to be rougher than medium of large-sized crystals. Quartz exhibits more favourable properties than feldspar between 100 and 500 μm; this is especially true for fine quartz crystals. The correlation that more content of coarse-grained quartz leads to high friction value cannot be proved in this research.]]></description>
      <pubDate>Sat, 03 Nov 2018 15:17:21 GMT</pubDate>
      <guid>https://trid.trb.org/View/1563309</guid>
    </item>
    <item>
      <title>Research on the Polishing Process of Aggregates on Pavement Surface on Basis of Mineral Characteristics</title>
      <link>https://trid.trb.org/View/1110051</link>
      <description><![CDATA[This paper investigates the behaviors of typical mineral components of the aggregates due to tire-polishing. Four kinds of granitic aggregates were polished and tested. The friction and surface texture in polishing process were monitored. The wearing behaviors of typical mineral components were analyzed by spectrum approach. It was found that a fine mineral structure for granite brings an overall high friction level. The alkali feldspars group contributes to almost constant skid resistance and these crystals experiences a unique increase on all wave lengths in the polish process. The work here may be helpful for an active design of a high friction level all through the service years for pavement surfaces.]]></description>
      <pubDate>Mon, 08 Aug 2011 14:20:36 GMT</pubDate>
      <guid>https://trid.trb.org/View/1110051</guid>
    </item>
    <item>
      <title>ETUDE DES PRODUITS DE BROYAGE. COMPTE-TENU DES RESISTANCES A L'ECRASEMENT DES PARTICULES.</title>
      <link>https://trid.trb.org/View/1081411</link>
      <description><![CDATA[CETTE COMMUNICATION PRESENTE UNE ETUDE EXPERIMENTALE DES PRODUITS DE BROYAGE. LE BUT DE LA RECHERCHE EST AUSSI DE VERIFIER LA VALIDITE DE CERTAINES  HYPOTHESES COURAMMENT EMPLOYEES DANS LES MODELES MECANISTIQUES ET D'EN DEGAGER L'INFLUENCE SUR LES RESULTATS DE SIMULATIONS DE BROYAGE. L'ETUDE S'APPUIE SURTOUT SUR LES RESULTATS D'ESSAIS DE BROYAGE PAR LOT DANS UN BROYEUR DE LABORATOIRE ET SUR LES RESULTATS D'ESSAIS D'ECRASEMENT DE PARTICULES  DE FORME IRREGULIERE FAITS SUR DES ROCHES A BASE DE CALCITE, DE LA CALCITE, DES QUARTZ ET UN FELDSPATH. UN MODELE EST SUGGERE QUI REND PLUS FACILE  LA DETERMINATION DE FONCTIONS DE FRAGMENTATION EXEMPTES DE BROYAGE SECONDAIRE ET UNE EQUATION A TROIS PARAMETRES EN PERMET DES COMPARAISONS PLUS FACILES. LA VARIATION DES FONCTIONS DE FRAGMENTATION AVEC LA DIMENSION DES PARTICULES EST MISE EN EVIDENCE. LES RELATIONS ENTRE DEUX DES PARAMETRES DES FONCTIONS DE FRAGMENTATION ET UNE CARACTERISTIQUE MECANIQUE (CHARGE DE RUPTURE MOYENNE) DES PARTICULES D'ALIMENTATION SONT ETUDIEES. LES CARACTERISTIQUES DES PARTICULES NOUVELLEMENT PRODUITES SONT COMPAREES A CELLES DES  PARTICULES AYANT SERVI D'ALIMENTATION DE BROYAGE ET CERTAINES INFLUENCES  DES PARTICULES NOUVELLEMENT PRODUITES SUR LES FONCTIONS DE BROYAGE SONT DISCUTEES.(A)]]></description>
      <pubDate>Sun, 21 Nov 2010 18:36:34 GMT</pubDate>
      <guid>https://trid.trb.org/View/1081411</guid>
    </item>
    <item>
      <title>APPLICATION D'UN ENDUIT SUPERFICIEL COMME TECHNIQUE D'ENTRETIEN D'UN OUVRAGE D'ART - DALLE BETON - DALLE ORTHOTROPE.</title>
      <link>https://trid.trb.org/View/1078416</link>
      <description><![CDATA[LE PONT DE RICHEMONT SUR L'AUTOROUTE A31 (METZ-THIONVILLE) EST UN OUVRAGE  METALLIQUE A DEUX TABLIERS, L'UN MIXTE (DALLES EN BETON PRECONTRAINT POSEES SUR DES POUTRES METALLIQUES), L'AUTRE A DALLE ORTHOTROPE. EN AVRIL 1972, ON OBSERVAIT SUR LA DALLE ORTHOTROPE, RECOUVERTE D'UN REVETEMENT CONSTITUE DE VERNIS, DE MASTIC ET D'ENROBE, DES FISSURATIONS LONGITUDINALES ET SUR LE TABLIER MIXTE DONT LE REVETEMENT EST UN SABLE ENROBE A CHAUD (SAND ASPHALT), DE NOMBREUSES CAVITES ET QUELQUES FISSURES LOCALISEES. TROIS SOLUTIONS ETAIENT POSSIBLES : 1 - ENLEVEMENT DU REVETEMENT, SABLAGE DE LA TOLE  ET POSE D'UN NOUVEAU REVETEMENT ; 2 - INJECTION DES FISSURES MAIS CELA N'AURAIT PAS EMPECHE LES FISSURATIONS ULTERIEURES ; 3 - LA METHODE CHOISIE : APPLICATION SUR LE REVETEMENT ACTUEL D'UN ENDUIT APRES COLMATAGE DES FISSURES. LE LIANT DE L'ENDUIT EST A BASE DE BITUME THIOELASTOMERE ET LE GRANULAT DE TRAPP DUR ET DE BONNE QUALITE (ANDESITE). LES FISSURES DU COTE DALLE ORTHOTROPE ONT ETE INJECTEES A CHAUD A L'AIDE D'UN GOUDRON D'IMPREGNATION ET COTE DALLE EN BETON PRECONTRAINT AVEC UN BITUME THIOELASTOMERE. LA MISE EN OEUVRE AYANT ETE FAITE A UNE EPOQUE DE L'ANNEE TROP TARDIVE EN CAS D'ECHEC IL SERA DIFFICILE DE CONCLURE A L'INEFFICACITE DE CETTE TECHNIQUE.  APRES QUELQUES INDICATIONS SUR LES GRANULATS, LES LIANTS ET LA MISE EN OEUVRE DE L'ENDUIT, L'AUTEUR TRAITE DES CONSTATATIONS FAITES PENDANT L'HIVER 72-73 ET AU COURS DE L'ETE 73 : REFISSURATION LIMITEE AVEC REMONTEE DE ROUILLE AU COURS DE L'HIVER, PUIS PENDANT L'ETE MURISSEMENT DES ENDUITS, RESSUAGE SUR LA VOIE POIDS LOURDS, REFERMETURE SUPERFICIELLE DES FISSURES PAR LE LIANT AVEC AGGLOMERATION DE LA ROUILLE. IL CONCLUT QUE L'APPLICATION D'ENDUIT PEUT VALABLEMENT PROTEGER LES OUVRAGES D'ART PENDANT UN AN OU DEUX MAIS QU'IL SERA NECESSAIRE DE REMPLACER ENSUITE LE REVETEMENT.]]></description>
      <pubDate>Sun, 21 Nov 2010 16:53:02 GMT</pubDate>
      <guid>https://trid.trb.org/View/1078416</guid>
    </item>
    <item>
      <title>STUDY OF CRUSHING MATERIALS ESPECIALLY OF THE CRUSHING STRENGTH OF PARTICLES</title>
      <link>https://trid.trb.org/View/1078057</link>
      <description><![CDATA[THE AIM OF THE STUDY DESCRIBED WAS TO VERIFY THE VALIDITY OF SOME ASSUMPTIONS WIDELY USED IN MODELS AND TO DETERMINE THEIR INFLUENCE ON RESULTS OF SIMULATED CRUSHING TESTS. THE STUDY USED MAINLY RESULTS OF BATCH CRUSHING TESTS IN A LABORATORY CRUSHER AND RESULTS OF CRUSHING TESTS ON PARTICLES OF IRREGULAR SHAPE FROM CALCITE, QUARTZ AND FELSPAR. A MODEL IS SUGGESTED WHICH FACILITATES THE DETERMINATION OF CRUSHING PARAMETERS WITHOUT SECONDARY CRUSHING. A THREE-PARAMETER EQUATION IS DERIVED TO FACILITATE COMPARISONS. THE RESULTS OBTAINED SHOW THE RELATION BETWEEN CRUSHING PARAMETERS AND THE SIZE OF PARTICLES. A SPECIAL STUDY WAS MADE OF THE RELATION BETWEEN TOO CRUSHING PARAMETERS AND ONE MECHANICAL CHARACTERISTICS (AVERAGE FAILURE LOAD) OF THE PARTICLES. THE CHARACTERISTICS OF THE PARTICLES OBTAINED AFTER CRUSHING ARE COMPARED WITH THOSE OF THE ORIGINAL PARTICLES CRUSHED. THIS  ARTICLE IS IN FRENCH.]]></description>
      <pubDate>Sun, 21 Nov 2010 16:41:18 GMT</pubDate>
      <guid>https://trid.trb.org/View/1078057</guid>
    </item>
    <item>
      <title>APPLICATION OF A SURFACE DRESSING AS A MAINTENANCE FOR AN ENGINEERING STRUCTURE- CONCRETE SLAB- ORTHOTROPIC SLAB</title>
      <link>https://trid.trb.org/View/1075005</link>
      <description><![CDATA[THE RICHEMONT BRIDGE ON THE A31 METZ-THIONVILLE MOTORWAY IS A TWO-DECK METAL STRUCTURE. ONE OF THE DECKS IS COMPOSITE PRESTRESSED CONCRETE SLABS ON  METAL GIRDERS), THE OTHER CONSISTS OF AN ORTHOTROPIC SLAB. IN 1972, THE ORTHOTROPIC SLAB, WHICH HAD A VARNISH-MASTIC-BITUMINOUS MIXTURE SURFACING,  SHOWED LONGITUDINAL CRACKS, AND THE COMPOSITE (SURFACING BEING HOT-COATED SAND ASPHALT) SOME LOCALIZED CRACKS AND NUMEROUS SMALL CAVITIES. THREE SOLUTIONS WERE ENVISAGED: 1 REMOVAL OF THE SURFACING, SANDING AND APPLICATION OF NEW SURFACING; 2 INJECTION IN CRACKS; 3 APPLICATION ON THE EXISTING SURFACING OF A SURFACE DRESSING AFTER FILLING OF THE CRACKS. THE LAST OPTION WAS CHOSEN. THE BINDER USED CONTAINS THIOELASTOMER BITUMEN AND HIGH-QUALITY HARD AGGREGATES (ANDESITE). THE CRACKS IN THE ORTHOTROPIC SLAB WERE INJECTED WITH HOT IMPREGNATION TAR, IN THE PRESTRESSED CONCRETE SLAB WITH THIOELASTOMER BITUMEN. DETAILS ARE GIVEN OF THE AGGREGATES, BINDERS AND LAYING METHODS USED. OBSERVATIONS TAKEN DURING THE 1972-1973 WINTER AND DURING THE SUMMER OF 1973 SHOWED: RECURRENT LIMITED CRACKING WITH APPARITION OF  RUST DURING THE WINTER, MEASURING OF THE SURFACE DRESSING DURING THE SUMMER, BLEEDING ON THE SLOW LANE FOR HEAVY VEHICLES, SURFACE RECLOSING OF THE CRACKS BY AGGLOMERATION OF THE BINDER WITH THE RUST. IT IS CONCLUDED THAT SURFACE DRESSINGS CAN BE USED TO PROTECT STRUCTURES FOR ONE OR TWO YEARS, BUT THAT THE SURFACING NEEDS TO BE REPLACED AFTER THAT PERIOD.]]></description>
      <pubDate>Sun, 21 Nov 2010 14:50:52 GMT</pubDate>
      <guid>https://trid.trb.org/View/1075005</guid>
    </item>
    <item>
      <title>ETUDE PETROLOGIQUE ET PETROGENETIQUE DES ROCHES GRANITIQUES DE LA CHAINE DU LITTORAL CATALAN</title>
      <link>https://trid.trb.org/View/1060435</link>
      <description><![CDATA[IL S'AGIT DU RESUME D'UNE THESE DE DOCTORAT SUR L'ETUDE DES GRANITES COTIERS CATALANS.  LES DIFFERENTS CHAPITRES ABORDENT LES THEMES SUIVANTS: 1) EXPOSE DES INTERPRETATIONS ET DES CONNAISSANCES ACTUELLES.  2) ETUDE DE LA PETROGRAPHIE ET DE LA CHIMIE DES ROCHES GRANITIQUES, EN INSISTANT SUR LES STRUCTURES D'INTERCROISSANCE.  3) TECHNIQUES PETROGRAPHIQUES DE LABORATOIRE (PLATINE DE FEDOFOV, ENTRE AUTRES), Y COMPRIS L'ANALYSE MODALE, LA TECHNIQUE DE TRAVAIL, LE CALCUL DU DEGRE D'APPROXIMATION ET D'ERREUR, L'APPLICATION DE L'ANANALYSE MODALE DE CALCUL DE LA COMPOSITION CHIMIQUE ET LES METHODES DE COLORATION DES FELDSPATHS POUR EN FACILITER LA DETERMINATION MINERALOGIQUE ET QUANTITATIVE RAPIDE ET SOULIGNER LEURS CARACTERISTIQUES STRUCTURELLES.  4) ANALYSE CHIMIQUE ET METHODES PETROCHIMIQUES, AVEC INTRODUCTION DU CALCUL DE LA "CELLULE SANDARD" DE BARTH POUR POUVOIR METTRE EN EVIDENCE LES MIGRATIONS DES ELEMENTS CHIMIQUES DES GRANITES.]]></description>
      <pubDate>Sun, 21 Nov 2010 07:01:55 GMT</pubDate>
      <guid>https://trid.trb.org/View/1060435</guid>
    </item>
    <item>
      <title>PETROLOGICAL AND PETROGENETIC STUDY OF THE GRANITIC ROCKS OF THE MOUNTAIN RANGE OF THE CATALAN COAST</title>
      <link>https://trid.trb.org/View/1060434</link>
      <description><![CDATA[THIS THESIS CONTAINS THE FOLLOWING CHAPTERS: (1) OUTLINE OF PRESENT KNOWLEDGE AND INTERPRETATIONS, (2) STUDY OF THE PETROGRAPHY AND CHEMISTRY OF GRANITIC ROCKS WITH EMPHASIS PLACED ON STRUCTURAL INTERGROWTH, (3) LABORATORY PETROGRAPHIC TECHNIQUES (AMONG OTHERS: FEDOFOV PLATINUM) INCLUDING MODAL  ANALYSIS, WORKING TECHNIQUES, CALCULATION OF THE DEGREE OF APPROXIMATION  AND ERROR, APPLICATION OF THE MODAL ANALYSIS FOR CALCULATING THE CHEMICAL COMPOSITION AND METHOD OF COLOURING FELSPARS TO FACILITATE THEIR RAPID MINERALOGIC AND QUANTITATIVE DETERMINATION AND TO EMPHASIZE THEIR STRUCTURAL CHARACTERISTICS, (4) CHEMICAL ANALYSIS AND PETROCHEMICAL METHODS; INTRODUCTION OF THE "STANDARD CELL" BARTH CALCULATION WITH A VIEW TO DEMONSTRATING THE MIGRATION OF THE CHEMICAL ELEMENTS OF GRANITE.]]></description>
      <pubDate>Sun, 21 Nov 2010 07:01:54 GMT</pubDate>
      <guid>https://trid.trb.org/View/1060434</guid>
    </item>
    <item>
      <title>STRUCTURES D'INTERCROISSANCE: MIRMEQUITES</title>
      <link>https://trid.trb.org/View/1060401</link>
      <description><![CDATA[ON CONSIDERE ACTUELLEMENT QUE LES STRUCTURES MIRMEQUITIQUES SONT DUES A DES PROCESSUS DE REMPLACEMENT EXISTANT ENTRE FELDSPATH POTASSIQUE ET PLAGIOCLASE SODIQUE, BIEN QUE LES OPINIONS NE SOIENT PAS UNANIMES EN CE QUI CONCERNE LA FACON DONT CE PROCESSU A LIEU ET LES CAUSES QUI LE PROVOQUENT.  LES AUTEURS PENSENT QU'IL S'AGIT D'UN PHENOMENE LIE A DES PHASES D'INSTABILITE DE LA ROCHE, QUI TEND A DISPARAITRE LORSQUE CELLE-CI RETROUVE UN NOUVEL  ETAT D'EQUILIBRE.  CE TRAVAIL, PREMIER D'UNE SERIE QUI PORTERA SUR LES STRUCTURES D'INTERCROISSANCE OBSERVABLES DANS LES ROCHES GRANITIQUES, DECRIT LA MORPHOLOGIE ET LES CARACTERISTIQUES DE CES FORMES MIRMEQUITIQUES, LEURS TYPES LES PLUS REPRESENTATIFS ET LES INTERPRETATIONS GENETIQUES PRESENTANT LE PLUS GRAND INTERET PETROLOGIQUE.]]></description>
      <pubDate>Sun, 21 Nov 2010 07:01:19 GMT</pubDate>
      <guid>https://trid.trb.org/View/1060401</guid>
    </item>
    <item>
      <title>ETUDE DES PRODUITS DE BROYAGE COMPTE TENU DES RESISTANCES A L'ECRASEMENT DES PARTICULES</title>
      <link>https://trid.trb.org/View/1059177</link>
      <description><![CDATA[CETTE COMMUNICATION PRESENTE UNE ETUDE EXPERIMENTALE DES PRODUITS DE BROYAGE.  LE BUT DE LA RECHERCHE EST AUSSI DE VERIFIER LA VALIDITE DE CERTAINES HYPOTHESES COURAMMENT EMPLOYEES DANS LES MODELES MECANISTIQUES ET D'EN DEGAGER L'INFLUENCE SUR LES RESULTATS DE SIMULATION DE BROYAGE.  L'ETUDE S'APPUIE SURTOUT SUR LES RESULTATS D'ESSAIS DE BROYAGE PAR LOT DANS UN BROYEUR DE LABORATOIRE ET SUR LES RESULTATS D'ESSAIS D'ECRASEMENT DE PARTICULES  DE FORME IRREGULIERE FAITS SUR DES ROCHES A BASE DE CALCITE, DE LA CALCITE, DES QUARTZ ET UN FELDSPATH.  UN MODELE EST SUGGERE QUI REND PLUS FACILE LA DETERMINATION DE FONCTIONS DE FRAGMENTATION EXEMPTES DE BROYAGE SECONDAIRE ET UNE EQUATION A TROIS PARAMETRES EN PERMET DES COMPARAISONS PLUS FACILES.  LA VARIATION DES FONCTIONS DE FRAGMENTATION AVEC LA DIMENSION DES  PARTICULES EST MISE EN EVIDENCE.  LES RELATIONS ENTRE DEUX PARAMETRES DES FONCTIONS DE FRAGMENTATION ET UNE CARACTERISTIQUE MECANIQUE (CHARGE DE RUPTURE MOYENNE) DES PARTICULES D'ALIMENTATION SONT ETUDIEES.  LES CARACTERISTIQUES DES PARTICULES NOUVELLEMENT PRODUITES SONT COMPAREES A CELLES DE PARTICULES AYANT SERVI D'ALIMENTATION DE BROYAGE ET CERTAINES INFLUENCES DES PARTICULES NOUVELLEMENT PRODUITES SUR LES FONCTIONS DE BROYAGE SONT DISCUTEES  (A)  (T1 ET T2 PREPRINTS - GEOT : MINER PETROGR - M FOURMAINTRAUX).]]></description>
      <pubDate>Sun, 21 Nov 2010 06:35:16 GMT</pubDate>
      <guid>https://trid.trb.org/View/1059177</guid>
    </item>
    <item>
      <title>L'ACTIVITE POUZZOLANIQUE</title>
      <link>https://trid.trb.org/View/1058999</link>
      <description><![CDATA[L'ACTIVITE POUZZOLANIQUE EST DUE A UNE REACTION DE LA CHAUX AVEC LES PRODUITS DE L'ATTAQUE ALCALINE DES SILICATES ACIDES.  CETTE REACTION DONNE NAISSANCE A DES COMPOSES HYDRATES SEMBLABLES A CEUX QUI SE FORMENT PAR HYDRATATION DU CLINKER ET DU LAITIER GRANULE.  UN PROCESSUS PHYSICO-CHIMIQUE DE L'ETAPE D'ATTAQUE EST PROPOSE.  IL IMPLIQUE UNE POSSIBILITE THEORIQUE D'ACTIVITE POUZZOLANIQUE DES FELDSPATHS  (A).]]></description>
      <pubDate>Sun, 21 Nov 2010 06:31:01 GMT</pubDate>
      <guid>https://trid.trb.org/View/1058999</guid>
    </item>
    <item>
      <title>ESSAIS SUR LES GRANULATS - A- DETERMINATION DE L'EPAISSEUR MOYENNE DES GRAVILLONS - B- ESSAIS D'ALTERABILITE DES GRAVILLONS - C- DETERMINATION DE L'HOMOGENEITE DES GRAVILLONS</title>
      <link>https://trid.trb.org/View/1058941</link>
      <description><![CDATA[-1- L'EPAISSEUR MOYENNE DES GRAVILLONS EST DETERMINEE PAR LE TAMISAGE D'UNE CLASSE GRANULAIRE D/D SUR UNE SERIE CONTINUE DE GRILLES A FENTES PARALLELES QUI PERMET D'OBTENIR LE POURCENTAGE PONDERAL DE CHAQUE CLASSE GRANULAIRE EN EPAISSEUR.  B)LES ESSAIS D'ALTERABILITE ONT POUR BUT DE DETERMINER LES SENSIBILITES RESPECTIVES D'UNE ROCHE AUX : 1-MODIFICATIONS DE L'ETAT DE CONTRAINTE DE LA ROCHE ENTRAINANT LA DIMINUTION OU LA SUPPRESSION DE SON  CONFINEMENT, -2- MODIFICATIONS DE LA COMPOSITION CHIMIQUE DES EAUX ET/OU  DE LEURS CONDITIONS DE CIRCULATION ; LES EVOLUTIONS POSSIBLES DES ROCHES  SONT ESSENTIELLEMENT POUR TOUTES LES ROCHES, DES GONFLEMENTS ET EXPANSIONS DUS A LA FIXATION D'EAU PAR LEURS COMPOSANTS HYDROPHILES, UN DELITAGE LE LONG DES DISCONTINUITES PLANAIRES ; POUR LES ROCHES FELDSPATHIQUES, UN LESSIVAGE DES ZONES ALTEREES DES FELDSPATHS.  L'ESSAI DE LESSIVAGE CONSISTE  A PROVOQUER PAR UNE REACTION THERMOCHIMIQUE UN EFFET MECANIQUE COMPARABLE AU LESSIVAGE DE CES ZONES ALTEREES.  L'ESSAI A L'EAU OXYGENEE BOUILLANTE  PROVOQUE UN GONFLEMENT ACCELERE DES COMPOSANTS HYDROPHILES MINERAUX ARGILEUX.  L'ESSAI DE DELITAGE CONSISTE A METTRE EN EVIDENCE LES DISCONTINUITES QUI PEUVENT S'OUVRIR FACILEMENT ; ON PROVOQUE L'OUVERTURE DE CES DISCONTINUITES EN VAPORISANT BRUTALEMENT PAR UN CHOC THERMIQUE A 700 DEGRES C L'EAU QUI Y A ETE INTRODUITE PAR SATURATION.  -C- L'ESSAI D'HOMOGENEITE PAR LA METHODE DES LIQUEURS DENSES DOIT PERMETTRE LA SEPARATION VOLUMIQUE APPARENTE QUI ONT EN GENERAL UNE MOINDRE RESISTANCE MECANIQUE.  CES ESSAIS RENTRENT DANS LE CADRE DE LA FAER 35 01 5 DIRR 500286.]]></description>
      <pubDate>Sun, 21 Nov 2010 06:29:34 GMT</pubDate>
      <guid>https://trid.trb.org/View/1058941</guid>
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