Bibliografie tematiche / Cement composites

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Letteratura scientifica selezionata sul tema "Cement composites"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 31 luglio 2024

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Articoli di riviste sul tema "Cement composites"

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Komagata, Yuya, Yuki Nagamatsu e Hiroshi Ikeda. "Comparative Bonding Analysis of Computer-Aided Design/Computer-Aided Manufacturing Dental Resin Composites with Various Resin Cements". Journal of Composites Science 7, n. 10 (7 ottobre 2023): 418. http://dx.doi.org/10.3390/jcs7100418.

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The use of dental resin composites adapted to computer-aided design/computer-aided manufacturing (CAD/CAM) processes for indirect tooth restoration has increased. A key factor for a successful tooth restoration is the bond between the CAD/CAM composite crown and abutment tooth, achieved using resin-based cement. However, the optimal pairing of the resin cement and CAD/CAM composites remains unclear. This study aimed to identify the optimal combination of a CAD/CAM composite and resin cement for bonding. A commercial methyl methacrylate (MMA)-based resin cement (Super-Bond (SB)) and four other composite-based resin cements (PANAVIA V5; PV, Multilink Automix (MA), ResiCem EX (RC), and RelyX Universal Resin Cement (RX)) were tested experimentally. For the CAD/CAM composites, a commercial polymer-infiltrated ceramic network (PICN)-based composite (VITA ENAMIC (VE)) and two dispersed filler (DF)-based composites (SHOFU BLOCK HC (SH) and CERASMART300 (CE)) were used. Each composite block underwent cutting, polishing, and alumina sandblasting. This was followed by characterization using scanning electron microscopy, inorganic content measurement, surface free energy (SFE) analysis, and shear bond strength (SBS) testing. The results demonstrated that the inorganic content and total SFE of the VE composite were the highest among the examined composites. Furthermore, it bonded highly effectively to all the resin cements. This indicated that PICN-based composites exhibit unique bonding features with resin cements. Additionally, the SBS test results indicated that MMA-based resin cement bonds effectively with both DF- and PICN-based composites. The combination of the PICN-based composite and MMA-based resin cement showed the best bonding performance.
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Čáchová, Monika, Eva Vejmelková, Kateřina Šestáková, Pavel Reiterman, Martin Keppert, Dana Koňáková e Robert Černý. "Basic Physical and Mechanical Properties of Composites Based on Three Different Cements". Key Engineering Materials 677 (gennaio 2016): 186–90. http://dx.doi.org/10.4028/www.scientific.net/kem.677.186.

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This article is focused on cement based composites. Two cements differing in mineralogical composition are utilised as main binder in composites mixtures. Results of measured physical parameters of studied materials are presented. For the sake of comparison, a reference material with Portland cement was also prepared. Basic physical properties (measured by water vacuum saturation method and by helium pycnometry), characterizations of pore system (determined by mercury porosimetry) and mechanical properties are the matter of this study. Composites show various open porosity; the results of open porosity of materials containing special cements show higher values, in comparison with composite based on Portland cement. This fact of course influences other material characteristics - mainly mechanical properties.
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Kumar, A. Srujan, K. Naga Meenakshi, G. Venkata Narayana reddy, G. Raju, Ch Honey e P. Anil Kumar reddy. "Development of New Composites Using Industrial by Products". International Journal of Innovative Research in Engineering and Management 10, n. 6 (30 dicembre 2022): 126–29. http://dx.doi.org/10.55524/ijirem.2022.9.6.22.

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In this paper thesis describes an experimental investigation of magnesium based cement mortar which consists of fly ash, magnesium oxide (MgO), magnesium Phosphate (MgPO4) and Phosphate tailings. This magnesia based cements are emerged as a viable alternative to Portland cement, with both technical and sustainability advantages. This study aims to use the mixture of cement, fly ash and magnesia. The major drawback of delayed setting time can be eliminated with the use of magnesia based cement. Hence, in this study different admixtures such as magnesium oxide, magnesium phosphate, phosphate tailings are attempted. Initial and final setting time of plain cement, fly ash cement and magnesia based cement are determined and found that the small dosage of magnesium compound reduced the setting time. Further, magnesia based cements are reported to be used along with sea water without much negative effect. In view of all these, this study proposed a magnesia based cement as an alternative for conventional Portland cement. Industrial wastes such as fly ash, and phosphate tailings are used in this study.
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Liu, Hong Yan, Ping Zhao, Chen Feng e Rohit Sharma. "Cement-Sand Based Piezoelectric Smart Composites". Applied Mechanics and Materials 392 (settembre 2013): 9–13. http://dx.doi.org/10.4028/www.scientific.net/amm.392.9.

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In this paper, preliminary investigation of a new cement-sand based piezoelectric composite was conducted for potential structural engineering applications. PZT ceramic powder has been incorporated into cement material to form composite smart materials in earlier studies and showed promising outcome. However, the previous studies were limited to using only PZT and cement. In this study, PZT powder mixed with cement and sand, which is more realistic in civil engineering applications. The compressive strength of the composites with different PZT volume ratios was investigated. The results showed that embed PZTs increased the strength of the composites. Modified Sawyer-Tower circuit was applied to pole the composites in order to obtain the desired electrical properties of the composites. The mechanical and electrical properties of this type of new smart material had been investigated experimentally. Through a series of MTS compression tests, feasibility of using cement-sand based PZT composite materials in civil engineering is evaluated.
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Magalhães, Tiago, Rita Fidalgo-Pereira, Orlanda Torres, Óscar Carvalho, Filipe S. Silva, Bruno Henriques, Mutlu Özcan e Júlio C. M. Souza. "Microscopic Inspection of the Adhesive Interface of Composite Onlays after Cementation on Low Loading: An In Vitro Study". Journal of Functional Biomaterials 14, n. 3 (7 marzo 2023): 148. http://dx.doi.org/10.3390/jfb14030148.

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Purpose: This study aimed to assess the layer thickness and microstructure of traditional resin-matrix cements and flowable resin-matrix composites at dentin and enamel to composite onlay interfaces after cementation on low loading magnitude. Materials and Methods: Twenty teeth were prepared and conditioned with an adhesive system for restoration with resin-matrix composite onlays manufactured by CAD-CAM. On cementation, tooth-to-onlay assemblies were distributed into four groups, including two traditional resin-matrix cements (groups M and B), one flowable resin-matrix composite (group G), and one thermally induced flowable composite (group V). After the cementation procedure, assemblies were cross-sectioned for inspection by optical microscopy at different magnification up to ×1000. Results: The layer thickness of resin-matrix cementation showed the highest mean values at around 405 µm for a traditional resin-matrix cement (group B). The thermally induced flowable resin-matrix composites showed the lowest layer thickness values. The resin-matrix layer thickness revealed statistical differences between traditional resin cement (groups M and B) and flowable resin-matrix composites (groups V and G) (p < 0.05). However, the groups of flowable resin-matrix composites did not reveal statistical differences (p < 0.05). The thickness of the adhesive system layer at around 7 µm and 12 µm was lower at the interfaces with flowable resin-matrix composites when compared to the adhesive layer at resin-matrix cements, which ranged from 12 µm up to 40 µm. Conclusions: The flowable resin-matrix composites showed adequate flowing even though the loading on cementation was performed at low magnitude. Nevertheless, significant variation in thickness of the cementation layer was noticed for flowable resin-matrix composites and traditional resin-matrix cements that can occur in chair-side procedures due to the clinical sensitivity and differences in rheological properties of the materials.
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a, Nayeemuddin, e Ansari Faiyaz Ahmed. "EVALUATION OF CEMENT POLYMER COMPOSITES USING SPSS ANALYSIS". International Journal of Advanced Research 11, n. 11 (30 novembre 2023): 407–17. http://dx.doi.org/10.21474/ijar01/17842.

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Cement Polymer Mixtures are made of Cement, sand, or bulk polymers are made using polymers added to improve their compressive strength, fatigue resistance, impact, and durability. Hydraulic cement polymer composites, created with modern polymer technology, are well-known for enhancing the development of composite materials and new products. This technology aims to improve both polymer cement for new construction and its use in repairing old cement. The adhesive properties of polymer cement allow for correction and bonding of both polymer-based and conventional cement. Cement-based composite materials, such as hardened cement paste, are formed by the combination of cement, water hydration, various minerals, metals, and polymeric materials. Different combinations of these materials can result in cement binders that are used for construction. Cement, a chemical substance used as a binder, sets and hardens to bind things together. It is rarely used alone and is typically combined with sand and gravel. Polymer cement is a type of cement-polymer composite where conventional cement hydrates are replaced by polymer binders or liquid resins. It is prepared by completely replacing the hydrate binders of cement with the polymer binders or liquid resins. This mixture forms a cement-polymer composite. Cement-polymer composites are durable materials that exhibit long service life and can withstand harsh environmental conditions. They are not affected by extreme temperatures, whether hot or cold, as dry concrete has a low coefficient of expansion and can accommodate moderate movements in the design. Evaluation parameters for cement include calcium oxide, magnesium oxide, silicon dioxide, aluminum oxide, sodium oxide, potassium oxide, and sulfur trioxide.
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Rödel, Michaela, Jörg Teßmar, Jürgen Groll e Uwe Gbureck. "Tough and Elastic α-Tricalcium Phosphate Cement Composites with Degradable PEG-Based Cross-Linker". Materials 12, n. 1 (24 dicembre 2018): 53. http://dx.doi.org/10.3390/ma12010053.

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Abstract (sommario):
Dual setting cements composed of an in situ forming hydrogel and a reactive mineral phase combine high compressive strength of the cement with sufficient ductility and bending strength of the polymeric network. Previous studies were focused on the modification with non-degradable hydrogels based on 2-hydroxyethyl methacrylate (HEMA). Here, we describe the synthesis of suitable triblock degradable poly(ethylene glycol)-poly(lactide) (PEG-PLLA) cross-linker to improve the resorption capacity of such composites. A study with four different formulations was established. As reference, pure hydroxyapatite (HA) cements and composites with 40 wt% HEMA in the liquid cement phase were produced. Furthermore, HEMA was modified with 10 wt% of PEG-PLLA cross-linker or a test series containing only 25% cross-linker was chosen for composites with a fully degradable polymeric phase. Hence, we developed suitable systems with increased elasticity and 5–6 times higher toughness values in comparison to pure inorganic cement matrix. Furthermore, conversion rate from α-tricalcium phosphate (α-TCP) to HA was still about 90% for all composite formulations, whereas crystal size decreased. Based on this material development and advancement for a dual setting system, we managed to overcome the drawback of brittleness for pure calcium phosphate cements.
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Ekincioglu, Ozgur, M. Hulusi Ozkul, Yoshihiko Ohama, Silvia Patachia e Georgeta Moise. "Effect of Epoxy Resin Addition on the Moisture Sensitivity of Macro Defect Free Polymer-Cement Composites". Key Engineering Materials 466 (gennaio 2011): 65–72. http://dx.doi.org/10.4028/www.scientific.net/kem.466.65.

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Macro-defect-free (MDF) cements are cement-polymer composites and were developed by Birchall et al. three decades ago. The composites are produced by mixing small amounts of polymer and water with cement. However, they have a different production method than that of cement pastes, which was inspired by rubber production. Mixtures of cement, polymer and water are processed by using a two-roll mill. The composites are known with their high flexural strengths. Unfortunately, there are not any known commercial products using MDF cements because of their poor durability under moisture. In this study, MDF cements were prepared by using poly(vinyl alcohol--vinyl acetate) PVA, calcium aluminate cements and two different types of epoxy resins. Epoxy resins were a diglycidyl ether of bisphenol A and a mixture of a diglycidyl ethers of bisphenol A and F. Durability performance was compared with respect to biaxial flexural strengths, contact angle and atomic force microscopy (AFM) for the specimens stored in water.
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Sikora, Pawel, e Sang-Yeop Chung. "Cement-Based Composites: Advancements in Development and Characterization". Crystals 10, n. 9 (17 settembre 2020): 832. http://dx.doi.org/10.3390/cryst10090832.

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This Special Issue on “Cement-Based Composites: Advancements in Development and Characterization” presents the latest research and advances in the field of cement-based composites. This special issue covers a variety of experimental studies related to fibre-reinforced, photocatalytic, lightweight, and sustainable cement-based composites. Moreover, simulation studies are present in this special issue to provide the fundamental knowledge on designing and optimizing the properties of cementitious composites. The presented publications in this special issue show the most recent technology in the cement-based composite field.
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Sikora, Pawel, Didier Lootens, Maxime Liard e Dietmar Stephan. "The effects of seawater and nanosilica on the performance of blended cements and composites". Applied Nanoscience 10, n. 12 (9 marzo 2020): 5009–26. http://dx.doi.org/10.1007/s13204-020-01328-8.

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AbstractThis study investigates the effects of seawater and nanosilica (3% by weight of cement), on the fresh and hardened properties of cement pastes and mortars produced with two types of low heat cements: Portland pozzolana cement (CEM II) and blast furnace cement (CEM III). The heat of hydration, initial and final setting times, rheological properties, strength development, sorptivity and water accessible porosity of the cement pastes and mortars were determined. The data reveal that cement type has a significant effect on the reaction rate of cement with seawater and nanosilica (NS). Specimens produced with slag-blended cement exhibited a higher cement reaction rate and the composite produced exhibited better mechanical performance, as a result of the additional reaction of alumina rich phases in slag, with seawater. Replacement of freshwater with seawater contributes mostly to a significant improvement of early strength. However, in the case of slag-blended cement, 28 day strength also improved. The incorporation of NS results in additional acceleration of hydration processes, as well as to a decrease in cement setting time. In contrast, the addition of NS results in a noticeable increment in the yield-stress of pastes, with this effect being pronounced when NS is mixed along with seawater. Moreover, the use of seawater and NS has a beneficial effect on microstructure refinement, thus improving the transport properties of cement mortars. Overall, the study has showed that both seawater and NS can be successfully used to accelerate the hydration process of low heat blended cements and to improve the mechanical and transport properties of cement-based composites.
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Tesi sul tema "Cement composites"

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Cheung, Yin Nee. "Investigation of concrete components with a pseudo-ductile layer /". View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202004%20CHEUNGY.

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Guodong, Xu. "Fibre-cement hybrid composites". Thesis, University of Surrey, 1994. http://epubs.surrey.ac.uk/844012/.

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The theoretical stress-strain behaviour of individual fibre reinforced cement composites is reviewed. Based on the multiple cracking concept of the existing theory, analytical expressions are developed to describe the tensile stress-strain behaviour of a fibre-cement hybrid composite consisting of three components, i.e. two reinforcing fibres with different moduli, strengths and strains to failure and a common cement binder. The model predicts that the tensile stress-strain curve of the hybrid composites consists of five stages, instead of three stages of the existing models for individual fibre cements, and relates the tensile behaviour of each stage to the component properties of the components and the test system parameters. A description is given of the physical and mechanical properties of four types of reinforcing fibres used in the study. These were fibrillated polypropylene film, alkali-resistant glass, polyvinyl alcohol fibres and carbon fibres. A small number of direct tensile tests on continuous glass, carbon and polyvinyl alcohol were performed. The tensile stress-strain behaviour of four types of fibre-cement hybrid composites was studied with particular emphasis on that of the glass- polypropylene hybrids for which the flexural load-deflection behaviour was also examined. It is shown that the fibre-cement hybrid composites yield superior engineering properties over their parent composites and the improvements are sensitive to volume fractions of each of the two fibres. The measured tensile stress-strain curves of the hybrids were compared with the theoretical predictions and satisfactory agreement in general is obtained. Implications from the present work for the design of fibre-cement hybrid composites are assessed.
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Cheung, Kwok Fai. "Applications of pseudo-ductile engineered cementitious composites for construction industry /". View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202004%20CHEUNGK.

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Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2004.
Includes bibliographical references (leaves 314-315). Also available in electronic version. Access restricted to campus users.
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Mohr, Benjamin J. "Durability of Pulp Fiber-Cement Composites". Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7222.

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Wood pulp fibers are a unique reinforcing material as they are non-hazardous, renewable, and readily available at relatively low cost compared to other commercially available fibers. Today, pulp fiber-cement composites can be found in products such as extruded non-pressure pipes and non-structural building materials, mainly thin-sheet products. Although natural fibers have been used historically to reinforce various building materials, little scientific effort has been devoted to the examination of natural fibers to reinforce engineering materials until recently. The need for this type of fundamental research has been emphasized by widespread awareness of moisture-related failures of some engineered materials; these failures have led to the filing of national- and state-level class action lawsuits against several manufacturers. Thus, if pulp fiber-cement composites are to be used for exterior structural applications, the effects of cyclical wet/dry (rain/heat) exposure on performance must be known. Pulp fiber-cement composites have been tested in flexure to examine the progression of strength and toughness degradation. Based on scanning electron microscopy (SEM), environmental scanning electron microscopy (ESEM), energy dispersive spectroscopy (EDS), a three-part model describing the mechanisms of progressive degradation has been proposed: (1) initial fiber-cement/fiber interlayer debonding, (2) reprecipitation of crystalline and amorphous ettringite within the void space at the former fiber-cement interface, and (3) fiber embrittlement due to reprecipitation of calcium hydroxide filling the spaces within the fiber cell wall structure. Finally, as a means to mitigate kraft pulp fiber-cement composite degradation, the effects of partial portland cement replacement with various supplementary cementitious materials (SCMs) has been investigated for their effect on mitigating kraft pulp fiber-cement composite mechanical property degradation (i.e., strength and toughness losses) during wet/dry cycling. SCMs have been found to be effective in mitigating composite degradation through several processes, including a reduction in the calcium hydroxide content, stabilization of monosulfate by maintaining pore solution pH, and a decrease in ettringite reprecipitation accomplished by increased binding of aluminum in calcium aluminate phases and calcium in the calcium silicate hydrate (C-S-H) phase.
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Kakemi, Manabu. "Hybrid continuous fibre cement composites". Thesis, University of Surrey, 1997. http://epubs.surrey.ac.uk/606/.

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Karade, Sukhdeo Rao. "An investigation of cork-cement composites". Thesis, Bucks New University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273892.

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Zhang, Jie. "Microstructure study of cementitious materials using resistivity measurement /". View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202008%20ZHANG.

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El-Ashkar, Nabil H. "Wood pulp microfibers in cement-based composites : improving fiber distribution and characterizing composite behavior". Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/21518.

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McNulty, Thomas A. "The durability of cement bound minestone". Thesis, Aston University, 1985. http://publications.aston.ac.uk/14289/.

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The demand for road making materials continues to pressurise the supply of traditional good quality aggregates. Over the years, therefore, consideration has been given to alternative materials including industrial wastes. This thesis is concerned with potential use of Minestone, the by-product of coal mining, for the lower structural layers of pavement construction. Because of their clay like nature, Minestones do not merit consideration for such applications in an unbound state and, therefore, some form of stabilisation is necessary. Previous research has demonstrated that certain cement bound minestones, containing between 5 and 10 per cent cement, satisfy current Department of Transport requirements for use in pavement construction and, furthermore, they are not frost susceptible. However, doubts concerning the durability of cement bound minestones still remain. The thesis includes a review of both the cement and lime stabilisation techniques and also traces the origin and development of the methods used to assess the quality and durability of stabilised materials. An experimental study is described in which cement bound minestone specimens were subjected to a programme of tests which examined compressive strength, resistance to immersion, and resistance to freezing and thawing. The results of the tests were related to the properties of the raw materials. It was discovered that the response to cement stabilisation was governed mainly by the source of the minestone and, to a lesser degree, the cement content. It was also found that resistance in the durability tests was generally improved when the initial moisture content was raised above the optimum value. The result suggest that current methods for assessing cement stabilised materials are not appropriate to cement bound minestones. Alternative methods and criteria, based on volume change and retained strength following immersion and freeze-thaw tests, have been proposed. It is believed that these methods and criteria should also apply to other cement bound materials.
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Boulfiza, Mohamed. "Constitutive modeling of fiber reinforced cement composites". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0004/NQ27111.pdf.

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Libri sul tema "Cement composites"

1

P, Shah S., a cura di. Fiber-reinforced cement composites. New York: McGraw-Hill, 1992.

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Mechtcherine, Viktor, Volker Slowik e Petr Kabele, a cura di. Strain-Hardening Cement-Based Composites. Dordrecht: Springer Netherlands, 2018. http://dx.doi.org/10.1007/978-94-024-1194-2.

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Sadowski, Łukasz. Adhesion in Layered Cement Composites. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-03783-3.

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Brandt, A. M. Cement-based composites: Materials, mechanical properties and performance. London: Spon, 1995.

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Sidney, Mindess, a cura di. Fibre reinforced cementitious composites. London: Elsevier Applied Science, 1990.

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Sidney, Mindess, a cura di. Fibre reinforced cementitious composites. 2a ed. London: Taylor & Francis, 2007.

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Makul, Natt. Principles of Cement and Concrete Composites. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69602-3.

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Balaguru, Perumalsamy N. Fiber-reinforced cementcomposites. New York: McGraw-Hill, 1992.

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Chaplin, R. G. Mixing and testing of cement: Sand floor screeds. Wexjam Springs, Slough: Cement and Concrete Association, 1986.

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Institute for Material and Environmental Research and Consulting (Netherlands). Vegetable-fibre cement board. Vienna]: United Nations Industrial Development Organization, 1988.

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Capitoli di libri sul tema "Cement composites"

1

Reales, Oscar Aurelio Mendoza, e Romildo Dias Toledo Filho. "Nanotube–Cement Composites". In Carbon Nanomaterials Sourcebook, 579–602. Boca Raton : Taylor & Francis Group, 2016. | “A CRC title.” |: CRC Press, 2018. http://dx.doi.org/10.1201/9781315371337-26.

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Gesser, H. D. "Cement, Ceramics, and Composites". In Applied Chemistry: A Textbook for Engineers and Technologists, 307–19. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4615-0531-0_16.

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Roussak, O. V., e H. D. Gesser. "Cement, Ceramics, and Composites". In Applied Chemistry, 291–301. Boston, MA: Springer US, 2012. http://dx.doi.org/10.1007/978-1-4614-4262-2_17.

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Gram, Hans-Erik, e Kerstin Olsson. "High Strength Cement Paste". In Brittle Matrix Composites 2, 403–11. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2544-1_42.

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Roychand, R., J. Li, M. Saberian, S. Kilmartin-Lynch, M. M. Ul Islam, M. Maghfouri e F. Chen. "Effect of Different Additives on the Compressive Strength of Very High-Volume Fly Ash Cement Composites". In Lecture Notes in Civil Engineering, 313–20. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_32.

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AbstractThe cement industry is responsible for about 5–7% of global greenhouse gas emissions and with the rapid rise in global warming, it is imperative to produce an ecofriendly alternative to Portland cement. Fly ash (FA) is an abundantly available and least utilized industrial byproduct with good pozzolanic properties that can help reduce the carbon footprint of cement composites. We investigated replacing 80% of the cement content with different blends of FA, nanosilica (NS) and silica fume (SF). Hydrated lime and a set accelerator were used to increase the pozzolanic reactivity of the blended cement composites. The portlandite released with 20% cement content was insufficient for the pozzolanic reaction of the blended cement composites containing FA and SF, requiring externally added hydrated lime. The addition of a set accelerator significantly increased the pozzolanic reaction and the resultant compressive strength, and these increased with the increasing content of the set accelerator. The replacement of SF with NS led to a remarkable increase in the pozzolanic reaction. The corresponding compressive strength of FA mixed with cement composites increased with increasing percentage composition of NS.
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Zohhadi, Nima, Nirupam Aich, Fabio Matta, Navid B. Saleh e Paul Ziehl. "Graphene Nanoreinforcement for Cement Composites". In Nanotechnology in Construction, 265–70. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17088-6_34.

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Hamelin, P., e P. Matray. "Mechanical Behaviour of Cement Based Composites". In Brittle Matrix Composites 3, 335–43. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3646-4_36.

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Shah, Surendra, e Yuan Gao. "Performance of Fiber Reinforced Materials: Historic Perspective and Glance in the Future". In Strain-Hardening Cement-Based Composites, 3–11. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1194-2_1.

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Ozu, Yuriko, Hiroshi Yamada, Akira Yasojima e Toshiyuki Kanakubo. "Evaluation of Shear and Tensile Bridging Characteristics of PVA Fibers Based on Bridging Law". In Strain-Hardening Cement-Based Composites, 88–96. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1194-2_10.

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Timothy, Jithender J., Tagir Iskhakov, Yijian Zhan e Günther Meschke. "A Multiscale Model for High Performance FRC". In Strain-Hardening Cement-Based Composites, 97–105. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1194-2_11.

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Atti di convegni sul tema "Cement composites"

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Dinesh, A. "Development of Self-Sensing Cement Composite Using Nanomaterials for Structural Health Monitoring of Concrete Columns – A Comprehensive Review". In Sustainable Materials and Smart Practices. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901953-23.

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Abstract (sommario):
Abstract. Due to age, structural deterioration, and other factors, concrete constructions such as beams and columns will inevitably deteriorate. The growth of nanomaterials and recent advances in multidisciplinary research has broadened cement composites' applicability in various fields. A self-sensing cement composite can detect its own deformation, strain, and stress by changing its electrical characteristics, which may be measured with electrical resistivity. Carbon-based nanomaterials, such as carbon fiber, carbon black, and carbon nanotube, have a strong potential to increase cement composite's mechanical (strength) and electrical (resistivity, sensitivity) potentials due to their remarkable strength and conductivity. Due to the artificial integration of conductive carbon-based components will generate piezoresistive properties in typical cement composites, transforming them into self-sensing cement composites. As a result, the review focuses primarily on the development of nanoparticle-based self-sensing cement composites and their use in the health monitoring of structural columns. This research critically examines the materials used, fabrication techniques, strength, and sensing methodologies used to develop the self-sensing cement composite. The difficulties of commercializing self-sensing cement composites, as well as potential solutions, are also highlighted. According to the review, the difference in Poisson ratio and youngs modulus between the self-sensing cement composite and columns leads the self-sensing cement composite to have different strength and conductivity before and after embedding in columns. According to the study, the addition of conductive material diminishes the composite's workability due to its large specific surface area. Because of the well-distributed conductive network, the composite's resistivity is significantly lowered. The study also shows that the inclusion of a self-sensing cement composite has no bearing capacity influence on the column. Finally, according to the review, the self-sensing cement composite has the ability to monitor the health of structural columns.
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"Textile Fabrics for Cement Composites". In SP-206: Concrete: Material Science to Application - A Tribute to Surendra P. Shah. American Concrete Institute, 2002. http://dx.doi.org/10.14359/12262.

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"Durability of Fiber Cement Composites". In "SP-126: Durability of Concrete: Second International Conference, Montreal, Canada 1991". American Concrete Institute, 1991. http://dx.doi.org/10.14359/2370.

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Zhao, Ping, Sunjung Kim, Joel Braden, Conner Abens e Brian Hinderliter. "Properties of Cement-Sand Based Piezoelectric Composites". In ASME 2014 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/smasis2014-7661.

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Abstract (sommario):
A novel cement-sand based piezoelectric smart composite was developed for structural health monitoring (SHM) in civil infrastructures. Most researches have focused on cement-based piezoelectric composites that are unrealistic in their applications due to their incompatibility with reinforced concrete with cement and sand. In this study, sand was applied to fabricate the composite to address the important issue. Two sets of specimens containing 30 vol% and 50 vol% lead zirconate titanate (PZT) were manufactured and their piezoelectric coefficient and dielectric constant were determined. The results showed that the piezoelectric effect and dielectric constant were enhanced with increasing PZT content. In addition, the sensing effect was conducted under compressive tests. The invesitigation demonstrated the feasibility of the new composite in its application to the SHM system.
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Domski, Jacek, Mateusz Gancarz, Anna Benešová, Hana Šimonová, Stanislav Seitl, Petr Frantík e Zbyněk Keršner. "Effect of Tire Cords, Steel and Polypropylene Fiber Content on the Fatigue Response of Cement-Based Mortars". In Non-Traditional Cement and Concrete 2023 conference. Switzerland: Trans Tech Publications Ltd, 2024. http://dx.doi.org/10.4028/p-5jmfqo.

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The subject of the study presented in this paper is to quantify the effect of fiber content on the mechanical and mainly fatigue response of fine-grained cement-based composites. The reference cement-based composite was without fibers. Three types of fibers were used as dispersed reinforcement: tire cords (waste material), steel, and polypropylene. For each type of fiber, mixtures with varying reinforcement levels per volume were prepared: 0.0 % (reference composite), 0.5 %, 1.0 %, and 1.5 %. Prismatic specimens 40 mm × 40 mm × 160 mm were prepared and tested. A total of 10 composite variants were investigated. The ages of the specimens for the static three-point bending tests were 28 days, for the compression tests were 28, 120, and 275 days. While for the fatigue tests, it was approximately between 110 and 180 days. The obtained compressive strength values for the above-mentioned composite ages were approximated by a selected exponential function and the results of the fatigue tests were standardized to a nominal age of 28 days using them. All used types of reinforcement increase the strength values of the composites even from the lowest fiber doses. A positive effect of fiber dosage above 0.5 % on the fatigue behavior of composites was shown only in the case of reinforcement with commercial steel fibers.
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Moriconi, G. "Cement-based composites for structural use". In MATERIALS CHARACTERISATION 2009. Southampton, UK: WIT Press, 2009. http://dx.doi.org/10.2495/mc090401.

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Han, Baoguo, Xun Yu e Jinping Ou. "Dispersion of Carbon Nanotubes in Cement-Based Composites and Its Influence on the Piezoresistivities of Composites". In ASME 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2009. http://dx.doi.org/10.1115/smasis2009-1318.

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Sodium dodecyl sulfate (SDS) and sodium dodecylbenzene sulfonate (NaDDBS) are used as surfactants to improve the dispersion of multi-walled carbon nanotubes (MWNTs) in cement mortar and fabricate piezoresistive carbon-nanotube/cement mortar composite. The piezoresistivity of carbon-nanotube/cement mortar composite with different content levels of MWNTs and different surfactants were explored under repeated loading and impulsive loading. Experimental results indicate that NaDDBS has higher efficiency than SDS for the dispersion of MWNTs in cement mortar. The response of the electrical resistance of carbon-nanotube/cement mortar composite with NaDDBS to external force is more stable and sensitive than that of carbon-nanotube/cement mortar composite with SDS. These findings indicate that the use of NaDDBS is an effective way for improving the dispersion of MWNTs in cement-based composite and fabricating MWNTs filled cement-based composite with stable and strong piezoresistive response.
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Vyšvařil, Martin, Tomáš Žižlavský e Pavla Rovnaníková. "Fresh state properties of spongilite blended cement pastes". In SPECIAL CONCRETE AND COMPOSITES 2020: 17th International Conference. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0041605.

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Němeček, Jiří, Pavel Trávníček, Vojtěch Pommer e Jiří Němeček. "Viscosimetry of cement pastes - Analytical and numerical solutions". In SPECIAL CONCRETE AND COMPOSITES 2020: 17th International Conference. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0042095.

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Machovec, Jan, Daniel Dobiáš e Pavel Reiterman. "Resistance of non-cement concrete to chloride ingress". In SPECIAL CONCRETE AND COMPOSITES 2019: 16th International Conference. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0000377.

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Rapporti di organizzazioni sul tema "Cement composites"

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Geleva, Elena, Nina Nikolova, Dimitar Tonev, Georgi Gyoshev, Aleksandar Nikolov, Hristo Protohristov e Stela Peneva. Immobilization of 3H on Cement-zeolite Composites. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, aprile 2019. http://dx.doi.org/10.7546/crabs.2019.04.04.

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Czarnecki, Lech, Andrzej Garbacz, Pawel Lukowski e James R. Clifton. Polymer composites for repairing of Portland cement concrete:. Gaithersburg, MD: National Institute of Standards and Technology, 1999. http://dx.doi.org/10.6028/nist.ir.6394.

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Sugama, Toshifumi. Alkali-Activated Cement Composites for High Temperature Goethermal Wells. Office of Scientific and Technical Information (OSTI), dicembre 2018. http://dx.doi.org/10.2172/1501578.

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Li, Victor C., e Yin-Wen Chan. Mechanical Interaction Between Synthetic Fiber and Cement Base Matrix in FRC Composites. Fort Belvoir, VA: Defense Technical Information Center, febbraio 1993. http://dx.doi.org/10.21236/ada265310.

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Sugama, Toshifumi, T. Sugama e T. Pyatina. Hydrophobic, Thermal-shock Resistant Lightweight Cement Composites in Hybrid Thermal Energy-Storage Geothermal Well System. Office of Scientific and Technical Information (OSTI), luglio 2023. http://dx.doi.org/10.2172/2204145.

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Sugama, Toshifumi, T. Sugama e T. Pyatina. Hydrophobic, Thermal-shock Resistant Lightweight Cement Composites in Hybrid Thermal Energy-Storage Geothermal Well System. Office of Scientific and Technical Information (OSTI), luglio 2023. http://dx.doi.org/10.2172/2281328.

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Ucak-Astarlioglu, Mine, Jedadiah Burroughs, Charles Weiss, Kyle Klaus, Stephen Murrell, Samuel Craig, Jameson Shannon, Robert Moser, Kevin Wyss e James Tour. Graphene in cementitious materials. Engineer Research and Development Center (U.S.), dicembre 2023. http://dx.doi.org/10.21079/11681/48033.

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Abstract (sommario):
This project aims to determine the influence of laboratory-generated graphene (LGG) and commercial-grade graphene (CGG) on the chemical structure and compressive strength of graphene-cement mixtures. Determining the graphene-cement structure/processing/property relationships provides the most useful information for attaining the highest compressive strength. Graphene dose and particle size, speed of mixing, and dispersant agent were found to have important roles in graphene dispersion by affecting the adhesion forces between calcium silicate hydrate (CSH) gels and graphene surfaces that result in the enhanced strength of cement-graphene mixtures. X-ray diffraction (XRD), Raman, and scanning electron microscope (SEM) analyses were used to determine chemical microstructure, and compression testing for mechanical properties characterization, respectively. Based on observed results both LGG and CGG graphene cement mixtures showed an increase in the compressive strength over 7-, 14-, and 28-day age curing periods. Preliminary dispersion studies were performed to determine the most effective surfactant for graphene dispersion. Future studies will continue to research graphene—cement mortar and graphene—concrete composites using the most feasible graphene materials. These studies will prove invaluable for military programs, warfighter support, climate change, and civil works.
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Al-Chaar, Ghassan, Allison Brandvold, Andrij Kozych e William Mendoza. 4D printing structures for extreme temperatures using metakaolin based geopolymers. Engineer Research and Development Center (U.S.), aprile 2023. http://dx.doi.org/10.21079/11681/46750.

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Geopolymers (GPs) are a class of amorphous, aluminosilicate-based ceramics that cure at room temperature. GPs are formed by mixing an aluminosilicate source, which is metakaolin in this case, with an alkali activator solution, which can be either sodium or potassium water glass. GPs have attracted interest for use in structural applications over the past few decades because they have superior mechanical properties to ordinary Portland cement (OPC). Additionally, they can tolerate much higher temperatures and produce a fraction of the CO₂ compared to OPC. This project aims to develop geopolymer composites for 4D printing (the fourth dimension being time) and test their mechanical properties. Rheology and the effects of curing in ambient conditions will be evaluated for fresh geopolymer. Freeze-thaw resistance will be evaluated on potentially printable composites for extreme temperature resistance, etc.
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Sugama, Toshifumi, e Tatiana Pyatina. Self-Healing, Re-adhering, and Corrosion-Mitigating Inorganic Cement Composites for Geothermal Wells at 270°-300°C: Final Report. Office of Scientific and Technical Information (OSTI), febbraio 2019. http://dx.doi.org/10.2172/1501577.

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Young, J. F., e R. L. Berger. Cement Paste Matrix Composite Materials Center. Fort Belvoir, VA: Defense Technical Information Center, ottobre 1987. http://dx.doi.org/10.21236/ada188657.

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