bluuebunny/crossref_metadata_2025_split huggingface dataset:
Impaired Glymphatic and Meningeal Lymphatic Functions in Patients with Chronic Migraine
Authors: Wu Chia‐Hung , Chang Feng‐Chi , Wang Yen‐Feng , Lirng Jiing‐Feng , Wu Hsiu‐Mei , Pan Li‐Ling Hope , Wang Shuu‐Jiun , Chen Shih‐Pin 
Published: December 2023

ObjectiveThis study was undertaken to investigate migraine glymphatic and meningeal lymphatic vessel (mLV) functions.MethodsMigraine patients and healthy controls (HCs) were prospectively recruited between 2020 and 2023. Diffusion tensor image analysis along the perivascular space (DTI‐ALPS) index for glymphatics and dynamic contrast‐enhanced magnetic resonance imaging parameters (time to peak [TTP]/enhancement integral [EI]/mean time to enhance [MTE]) for para‐superior sagittal (paraSSS)‐mLV or paratransverse sinus (paraTS)‐mLV in episodic migraine (EM), chronic migraine (CM), and CM with and without medication‐overuse headache (MOH) were analyzed. DTI‐ALPS correlations with clinical parameters (migraine severity [numeric rating scale]/disability [Migraine Disability Assessment (MIDAS)]/bodily pain [Widespread Pain Index]/sleep quality [Pittsburgh Sleep Quality Index (PSQI)]) were examined.ResultsIn total, 175 subjects (112 migraine + 63 HCs) were investigated. DTI‐ALPS values were lower in CM (median [interquartile range] = 0.64 [0.12]) than in EM (0.71 [0.13], p = 0.005) and HCs (0.71 [0.09], p = 0.004). CM with MOH (0.63 [0.07]) had lower DTI‐ALPS values than CM without MOH (0.73 [0.12], p < 0.001). Furthermore, CM had longer TTP (paraSSS‐mLV: 55.8 [12.9] vs 40.0 [7.6], p < 0.001; paraTS‐mLV: 51.2 [8.1] vs 44.0 [3.3], p = 0.002), EI (paraSSS‐mLV: 45.5 [42.0] vs 16.1 [9.2], p < 0.001), and MTE (paraSSS‐mLV: 253.7 [6.7] vs 248.4 [13.8], p < 0.001; paraTS‐mLV: 252.0 [6.2] vs 249.7 [1.2], p < 0.001) than EM patients. The MIDAS (p = 0.002) and PSQI (p = 0.002) were negatively correlated with DTI‐ALPS index after Bonferroni corrections (p < q = 0.01).InterpretationCM patients, particularly those with MOH, have glymphatic and meningeal lymphatic dysfunctions, which are highly clinically relevant and may implicate pathogenesis for migraine chronification. ANN NEUROL 2024;95:583–595
An eco‐friendly and high shear strength adhesive from catechol‐modified polyethyleneimine
Authors: Zhao Yifang , Liu Yuanyuan , Cheng Mengqing , Li Zixian , Meng Xinyu , Sun Ailing , Wei Liuhe , Liu Xingjiang , Li Yuhan 
Published: December 2023

AbstractConventional adhesives often emit volatile organic compounds (VOCs), which have a negative impact on human health. In this paper, an environmentally‐friendly supramolecular adhesive PD which has high adhesive and low VOCs emission is prepared by the reaction between polyethyleneimine (PEI) and 3,4‐dihydroxybenzaldehyde (DBA). PD containing abundant catechol groups exhibit excellent adhesion to wood substrates and is able to reach a maximum shear strength of 5.20 ± 0.39 MPa. One factor is attributed to multiple reactions between PEI, and DBA and oxidation of DBA. These reactions construct a complex three‐dimensional cross‐linked structure which is very helpful to improve the bonding performance of the adhesive. Another reason refers to the fact that a large number of catechol groups in PD can form a lot of hydrogen bonds with the amino group in PEI and the hydroxyl group in the wood substrate. These hydrogen bonds play an important role in enhancing shear strength. PD adhesives have a stronger bond strength than commercial chloroprene rubber (CR, Pattex‐PXL) and polyvinyl acetate adhesives (PVAc, JUJU‐8708) and have lower emissions of VOCs. As an environmentally‐friendly adhesive for wood‐based substrates, this adhesive may have potential applications in the wood processing industry.
Limonoids from the Branches and Leaves of Aglaia lawii and Their Cytotoxic Activities
Authors: Dong Jing‐Jing , Liu Han‐Fei , Wang Huan , Jiang Tai‐Bai , Lou Hua‐Yong , Li Jin‐Yu , Pan Wei‐Dong 
Published: December 2023

AbstractThree undescribed limonoids (1–3), named aglaians G–I, and one new natural product azedaralide (4), together with nine known analogues (5–13) were isolated from the branches and leaves of Aglaia lawii by RP C18 column, silica gel column, Sephadex LH‐20 column chromatography and preparative HPLC. The structures of the new compounds were elucidated by IR, HRESIMS, 1D, 2D NMR, electronic circular dichroism (ECD) calculations and X‐ray crystallography diffraction analysis. The results of bioassay showed that the compound 12 exhibited potential inhibitory activity against six human tumor cell lines (MDA‐MB‐231, MCF‐7, Ln‐cap, A549, HeLa and HepG‐2) with IC50 values as 8.0–18.6 μM.
Multidisciplinary approach for the prediction of cement paste rheological properties: physical analysis, experimental rheology and microstructural modelling
Authors: Thiedeitz Mareike , Crasselt Claudia , Xiao Peng , Ukrainczyk Neven , Schmidt Wolfram , Kränkel Thomas 
Published: December 2023

AbstractIn this contribution, an interdisciplinary approach was employed to investigate and describe the fresh rheology of cementitious pastes, using analytical techniques, microstructural modelling, and experimental rheometry. The pastes, based on Ordinary Portland Cement and Limestone Calcined Clay Cement at a solid volume fraction of Φ = 0.45, were subjected to various analyses. Physical and chemical analyses were conducted including laser granulometry and isothermal heat flow calorimetry. Dynamic rotational rheometry and static oscillatory rheometry, along with viscoplastic and viscoelastic rheological modelling were used to support the characterization of the pastes. A physics‐based Monte‐Carlo algorithm was developed to numerically describe rheological properties such as structural buildup and yield stress. The results showed that as the physical properties of the pastes became more complex, the correlation of several analysis methods went more challenging. However, the combination of analytical, experimental, and phenomenological rheology allowed for a more distinct characterization of the cement paste. These findings can serve as a basis for further multidisciplinary rheological characterization of cementitious building materials.
Temperature dependance of 3D printed concrete produced with copper tailings
Authors: Eugenin Claudia , Cuevas Karla , Navarrete Ivan 
Published: December 2023

Abstract3D printed concrete is being applied in an increasing amount worldwide. While in theory, there are environmental and economic benefits associated with using this technology, in practice, the amount of cement in printable concrete is much higher than in a conventional one, leading to increased environmental and economic costs. Furthermore, cement's performance relies heavily on climate variables, specifically temperature. One way to solve this issue is to include local alternative low‐CO2 materials, such as processed mine tailings, as cement replacement. This paper presents an experimental approach to assess the use of copper tailings as cement replacement in printable concrete under different ambient temperatures. Three levels of cement volume replacement have been researched. The copper tailings' rheological effect has been measured using standard printability tests and a rheometer. Four mixtures have been printed in a controlled‐climate chamber to evaluate print‐ability, buildability and extrudability. The mechanical effect has been assessed with compressive and flexural strength tests of samples collected from the printed specimens. The results show that copper tailings are a promising alternative to cement in printable concrete in countries where this by‐product is abundant.
Investigation of a hybrid binder system for large scale 3D printing
Authors: Remke Sebastian , Sant Gaurav , Gädt Torben 
Published: December 2023

AbstractLarge‐scale additive manufacturing of reactive suspensions, such as concrete, is being developed to freely create objects without the constraints of a formwork. One challenge in printing suspensions is the precise spatio‐temporal control over their rheological properties. For extrusion‐based processes the material must be pumpable to the nozzle of the printer, while once it has passed the nozzle, it must maintain its shape under the increasing pressure of subsequent layers. Therefore, it is beneficial if the material exhibits an appropriately designed rheology change at the nozzle. The objective of this work is to develop a printing suspension which achieves a rheological step change at the nozzle. Therefore, we create a hybrid binder system comprising of a fast, reactive organic component, which can be activated by heat and a second inorganic binder components, in our system the carbonation of calcium hydroxide, which delivers the final strength.The temperature dependent stiffening of the model suspensions is studied by oscillatory rheology at temperatures between 20 °C to 80 °C. For mechanical testing purposes, cuboid shaped samples are obtained by microwave heating followed by carbonation under ambient conditions. For the given porosity, the material reaches a compressive strength of up to 0.39 MPa in 10 seconds or up to 1.94 MPa in 10 minutes depending on the heating program. Subsequent carbonation for 7 days under ambient conditions gives a strength of up to 4.76 MPa.
Cyclic Deterioration of High‐performance Concrete – Findings of the Priority Programme SPP 2020
Authors: Lohaus Ludger , Oneschkow Nadja 
Published: December 2023

AbstractModern high‐performance concretes with ever‐higher compressive strengths allow the construction of slender structures which are exposed to higher fatigue‐relevant loads. Current fatigue design rules include a high reduction of the fatigue resistance, which increases with increasing concrete strength. Thus, the fatigue verification becomes crucial for the realisation of such concrete structures. However, there is still a lack of knowledge regarding the damage mechanisms which hinders a substantial improvement of the fatigue design rules. The objective of the priority programme SPP 2020 is to gain more knowledge concerning the fatigue behaviour of high‐performance concretes and damage mechanisms in a strong network of different research institutions. The investigation of the concrete fatigue behaviour is challenging because of the multiple interdependence of influences on the concrete fatigue behaviour, and the damage effects occurring on different scales. Highly instrumented experiments combined with the latest microstructural investigation techniques and numerical modelling on different scales are used to explore the fatigue damage mechanisms. The scope of the priority programme SPP 2020 is outlined and selected results from the projects involved are presented in this paper.
Erstanwendung eines eigenen UHFB‐Systems in situ in Deutschland für die Bushaltestelle Olympia Einkaufszentrum in München
Authors: Wagner Jörg‐Peter , Riedl Ronald , Braun Matthias , Sikorski Oliver 
Published: December 2023

AbstractReporting about the first application of UHPC in situ in Germany. As Switzerland's leading construction provider Implenia has developed an in situ UHPC application in the last 10 years. We report about the general idea of UHPC, the materials behavior, the tasks and solutions as well as possible use cases for infrastructure projects in Germany for this Ultrahigh‐Performance‐Concrete (UHPC)
Leichte Gesteinskörnungen aus Mauerwerkbruch – Ergebnisse der kleintechnischen Versuche
Authors: Liebezeit Steffen , Müller Anette 
Published: December 2023

AbstractDie Forschungen zur Herstellung leichter Gesteinskörnungen aus Mauerwerkbruch begann mit „Handversuchen”, in denen bereits 2010 die Machbarkeit nachgewiesen wurde. Es folgten Untersuchungen im Labormaßstab sowohl im Rahmen von Forschungsprojekten als auch mit von Kunden bereitgestelltem Material.Ab 2019 wurde damit begonnen, Untersuchungen im Recycling‐Technikum der IAB Weimar gGmbH durchzuführen, um so den aufgezeigten Lösungsweg für eine kommerzielle Nutzung vorzubereiten. Die von Industriepartnern zur Verfügung gestellten Ausgangsstoffe wurden im Anschluss an die Trocknung und die Grobzerkleinerung in einer Kugelmühle mit einem Mahlraumvolumen von 500 Litern unter Zugabe des Blähmittels gemahlen. Danach erfolgte die Herstellung von Granulaten auf einem Granulierteller mit einem Durchmesser von 1,0 m. Diese Granulate wurden nach der Trocknung in dem mit Erdgas beheizten Drehrohrofen mit einem Innendurchmesser von 0,6 m und einer Länge von 6 m gebrannt. Aus den verwendeten Ausgangsmaterialien mit Gipsgehalten bis zu 15 Masse‐% wurden leichte Gesteinskörnungen mit SO3‐Gehalten zwischen 0,14 und 0,52 Masse‐% hergestellt, die damit normenkonform in Bezug auf die Verwendung als leichte Gesteinskörnung für die Herstellung von Betonen sind. Die Gehalte an eluierbarem Sulfat gingen auf Werte unter 50 mg/l zurück, so dass auch von dieser Seite keine Einsatzbeschränkungen bestehen. Anhand der experimentellen Untersuchungen im Pilotmaßstab konnten erste technologische Aussagen gemacht werden. Danach können energetische Vorteile im Vergleich zu leichten Gesteinskörnungen aus Blähtonen erwartet werden. Praxistest zur Herstellung von Leichtbetonsteinen verliefen erfolgreich.
Along the S‐Curve – How Superplasticizers Affect the Yield Stress of Cement Paste
Authors: Rindle Olivia , Gädt Torben 
Published: December 2023

AbstractIn cementitious systems, superplasticizers have two core purposes. On the one hand, they are used to lower the yield stress of a cement paste without changing the water to cement (w/c) ratio. On the other hand, they can reduce the w/c ratio without changing the yield stress. The relationship between slump flow and dosage of a superplasticizer containing cement paste can be described as an S‐curve. Below a critical dosage, the superplasticizer does not increase the flow. Above this dosage, the flow increases linearly until the saturation dosage is reached. Further addition of polymer will therefore not increase the fluidity of the cement paste. The minimum dosage which corresponds to an onset of increased flow compared to a dispersant free paste is referred to as the critical dosage.In this study, we analysed the dosage curve for three different polymers: a mela‐mine based (MFS), a polycarboxylate ether (PCE) and a polyphosphate ether (PPE) superplasticizer. The dosage curves of each superplasticizer were measured with a slump flow test at two different w/c ratios. To observe even small changes in the ultra‐low dosages, MFS was measured using a rheometer. We have specifically examined the areas defined as critical dosage and saturation dosage. We have found that these definitions need to be revised, not with regards to their values, but in terms of a proper understanding.
Hydration characteristics and microstructure development of sodium hydroxide slag pastes exposed under different curing environments
Authors: Xhaferri Enera , Bier Thomas A. 
Published: December 2023

AbstractThe aim of this research is to investigate the effect of curing environments on strength development and microstructure changes of alkali activated slag pastes (AAS). Mixtures of AAS are prepared using 5% NaOH content at a water to binder ratio of 0.35. Samples are exposed to six different curing environments, including heat treatment in different temperatures (30, 60 and 90 °C) for 2, 7 and 28 days. Their properties, as heat of hydration, compressive strength as well as porosity and morphology have been investigated on both fresh and hardened pastes via XRD, NMR, MIP, TGA and ESEM/EDX. Heat treatment was found to be very effective in promoting high early strength, accelerating the strength development of AAS pastes. Samples cured at 30 °C showed the best results in terms of compressive strength and porosity development. The compressive strength of 28 days samples is slightly reduced as the curing temperature increased. There is no significant difference in the types of hydration products present in the AAS pastes cured at different temperatures for up to 28 days.
Cementitious materials limitations for concrete exposed to deicing salt plus repeated cycles of freezing and thawing
Authors: Janssen Donald , Lundgren Monica , Shogren Robert , Utgenannt Peter , Helsing Elisabeth 
Published: December 2023

AbstractReducing the carbon footprint of concrete generally involves reducing the amount of calcium oxide in the cementitous materials by blending flyash and/or ground limestone into the cement or by replacing some of the cement with supplementary cementitious materials. This increases the ratio of SiO2+Al2O3+Fe2O3 to CaO+MgO in the cementitious material. While reducing the CaO content of cementitious materials is good for the environment, it may not be good for concrete exposed to deicing salts plus repeated cycles of freezing and thawing due to the effect of carbonation. Though carbonation can refine the pore structure when using only portland cement, it coarsens the pore structure when using high levels of cement replacement. This leads to increased scaling potential. A review of the effects of different cementitious materials combinations on carbonation along with an examination of field performance of concrete exposed to deicing salt plus repeated cycles of freezing and thawing is used to develop a relationship based on the ratio of SiO2+Al2O3+Fe2O3 to CaO+MgO in order to determine when limitations on cement replacement, or additional protective measures may be needed when scaling is a concern.
Kompositzemente
Authors: Lipowskiy Annett , Müller Anette 
Published: December 2023

AbstractDer mit der Betonherstellung verbundene Zementverbrauch ist für einen erheblichen CO2‐Eintrag in die Atmosphäre verantwortlich. Um diesen Eintrag zu reduzieren, wird die Herstellung von Kompositzementen forciert, bei denen Zementklinker durch Zusatzstoffe ersetzt wird. Durch die Abkehr von fossilen Brennstoffen wird die Verfügbarkeit von traditionellen Zusatzstoffen wie Flugasche oder Hüttensand in Zukunft abnehmen. Als Alternativen bieten sich Absaugfüller, die bei der Aufbereitung von natürlichen Gesteinskörnungen anfallen, und Ziegelmehle, die aus Mauerwerkbruch gewonnen werden können, an. In beiden Fällen beeinflussen die Dispersität und die Materialart die Reaktivität dieser Zusatzstoffe entscheidend. In Bezug auf die „Dispersität” gilt der vereinfachende Ansatz, dass die Festigkeit mit steigender Mahlfeinheit zunimmt. Der Einfluss der Materialart kann bisher nicht eindeutig beschrieben werden. Als Ausblick wird auf die Unterscheidbarkeit von Ziegel‐ und Beton‐ bzw. Mörtelpartikel anhand der magnetischen Suszeptibilität eingegangen, woraus sich eine neue Möglichkeit der Sortierung ergeben könnte.
Green Transition of the Iron and Steel Industry – Impact on Slags and By‐Products
Authors: Wimmer Gerald , Fleischanderl Alexander , Voraberger Bernhard 
Published: December 2023

AbstractIron and steel together with the cement sector are the largest industrial CO2 emitters and pressure is mounting to reduce these emissions. For the iron and steel industry a shift from coal fired blast furnace to hydrogen based direct reduction, electrification via the electric arc furnace (EAF) and off‐setting with CCUS are today the most promising pathways. The iron and steel industry today is almost a closed cycle industry, where all by‐products from steel production can be recycled or used for further applications. Most of the slags that are generated in ironmaking are used as granulated blast furnace sand for cement production, hence landfilling of such slags has been largely eliminated. For steelmaking slags and dusts, different treatment and modification solutions have been developed and are in use. Still a certain part of these by products is not fully utilized. Green transition of the steel sector with less blast furnace and more direct reduction in operation will have a significant impact on the slags and by‐products generated in future. For a sustainable transition, circularity is a key aspect and slags will have to remain a secondary feed stock for the cement sector.
Carbonation behaviour of concretes with alternative binders at different CO2 concentrations
Authors: Kraft Bettina , Müller Matthias , Achenbach Rebecca , Ludwig Horst‐Michael , Raupach Michael 
Published: December 2023

AbstractIn order to reduce CO2 emissions in the construction sector, alternative binders are attracting more and more attention. Whether these alternative binders contain a lower clinker‐cement ratio or no Portland cement clinker at all, to be truly sustainable they must not compromise durability and must therefore be durable.The progress of carbonation and the associated reduction of the pH value have a major influence on the corrosion protection of steel reinforcement, especially as such “low carbon” concretes are typically less resistant against CO2 exposure. Previous research has shown that accelerated tests at elevated CO2 concentrations can lead to altered carbonation behavior, especially in systems low in Ca(OH)2.In this study, hydration products and carbonation resistance of various alternative cements and binders, such as composite cements with calcined clays or modified steel slag, alkali‐activated materials, C$SMA cement and a C‐S‐H binder were investigated. The carbonation was studied on mortar samples stored in three different CO2 concentrations ‐ atmospheric storage (∼0.04 vol.%), 0.3 vol.% and 1.0 vol.% CO2. It was found that the binders can be divided into three clusters on the basis of their hydration products and w/CaO or w/(CaO + MgOeq + Na2Oeq + K2Oeq) ratios, which in turn provide information on the carbonation behavior. For each cluster a different CO2 concentration can be recommended to achieve a realistic carbonation behavior in accelerated test procedures.
Verstärkter Lehm für niederfeste Bauteile: erste Untersuchungsergebnisse
Authors: Vaculik Selina , Cruz Cynthia Morales , Rezaie Ali Bashiri , Liebscher Marco , Mechtcherine Viktor , Matschei Thomas 
Published: December 2023

KurzfassungDer weltweit steigende Rohstoffverbrauch führt zu steigenden CO2‐Emissionen, welche zu einem nicht unerheblichen Teil von der Zementindustrie verursacht werden. Eine vielversprechende Möglichkeit, um klimaneutral zu bauen, ist der Einsatz von Lehm als bewährten Baustoff, der für seine raumklimaregulierenden Eigenschaften und leichte Verarbeitbarkeit bekannt ist. Herausforderungen beim allgemeinen Lehmbau sind das starke Schwinden sowie der erforderliche Witterungsschutz. Die Endfestigkeiten sind im Allgemeinen für den Bausektor unzureichend. Ein vielversprechender Ansatz besteht darin, den Ton mit mineralischen Zusätzen zu stabilisieren, um die mechanischen Eigenschaften insgesamt zu verbessern.Erste Ergebnisse zeigen, dass die Verwendung von Portlandzement und calciniertem Ton als Bindemittel die Festigkeit des verstärkten Tonmörtels um min. 10 MPa erhöht. Gleichzeitig schneidet diese Methode in Bezug auf die Ökobilanz besser ab als die alleinige Verwendung von Zement zur Verstärkung von Ton. Unter Verwendung von 10 M.‐% Additiven konnte eine Druckfestigkeitssteigerung von bis zu 550 % erzielt werden. Auch das Schwindverhalten konnte minimiert und parallel dazu der Wasserwiderstand erhöht werden. Die Ergebnisse der hier durchgeführten Untersuchungen zeigen eine praktikable Alternative zu Normalbeton im Niedrigfestigkeitsbereich.