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Showing 1 to 20 of 33 for “"Cement-based Materials"”.
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Plant-based admixtures for cement-based materials
… to enhance concrete workability and lower cement content. They are however predominantly derived from petrochemicals and hazardous substances that pose environmental, occupational, and health risks during manufacture, use, and disposal. This study investigates environmentally friendly …
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Biomineralization in cement based materials : inoculation of vegetative cells
Recently, self-healing applications of cement-based materials have received a lot of interest. One major area of interest with respect to self-healing applications in cement-based systems focuses on using biomineralization processes. Biomineralization is biochemical process in which microorganisms …
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Structure, strength and defect characterisation of cement based materials.
In cement based systems, the residual stresses are created by internal expansion. This provides toughening by the release of the residual stresses as the macro-crack propagates. While circumstantial evidence of the residual stresses exist (e.g. micro-crack formation leading to permanent deformation …
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Redistribution of moisture and ions in cement based materials
… curves were determined in a sorption balance for materials used in the floor constructions, viz, w/c 0.65 concrete, w/c 0.4 concrete, w/c 0.55 cement mortar, and Floor 4310 Fibre Flow, a self levelling flooring compound. Repeated absorption and desorption scanning curves starting from the …
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Rheology of cement-based materials used for large-scale 3D printing
L'impression 3D béton introduit une toute nouvelle technique de production d'éléments en béton. Les avantages de cette technique par rapport à la méthode de construction conventionnelle basée sur l’utilisation de coffrage sont (1) une production plus facile et moins coûteuse des éléments à …
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Co-Extrusion of Cement -Based Materials to Achieve Functionally Graded Microstructure
… cellulose. The effect of clays on plasticizing cementitious pastes was evaluated by rheological and zeta potential measurements. Only zeta potential was found to be valuable to assess the effectiveness of clay as a plasticizer. The PGN clay, which had high amount of montmorillonite, with …
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Mechanical and microstructural properties of steel fibre reinforced cement-based materials
… properties of plain and steel-fibre reinforced cement-based materials, and attempt to interpret the behaviour through microstructural considerations. Based on previous studies of steel fibre reinforced cements, an examination of the uniaxial, static compressive properties was initially …
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Modeling fresh behavior of cement-based materials for 3-D concrete printing
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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Sources of high temperature degradation of cement-based materials : nanoindentation and microporoelastic analysis
The effects of high temperature exposure on cement-based materials have been under investigation for quite some time, but a fundamental understanding of the sources of high temperature degradation has been limited by measurement capabilities. Using recent developments in nanotechnology and …
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STRATEGIES TO IMPROVE SHRINKAGE RESISTANCE OF CEMENT-BASED MATERIALS FOR EXTRUSION-BASED 3D PRINTING
… ii) investigate the influence of water-to-cement ratio, superplasticizer dosage, and welan gum content on mortar printability; iii) propose a “printability window” where rheological properties and desorptivity can secure successful printing; iv) investigate effect of shrinkage mitigation …
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Development of P-3DP (Powder-based 3D Printing) technologies for the production of cement-based materials
… involved in binder jetting 3D printing of cementitious materials by systematically studying the effects some key processing variables have on structural and dimensional performance variation of the printed components. Binder jetting has the potential for complex geometries with high …
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Experimental studies of sorption and transport of moisture in cement based materials with supplementary cementitious materials
Most deterioration processes in cement based materials are closely related to moisture sorption and moisture transport properties. Therefore, it is important to study these properties, both theoretically and practically. This work is an experimental investigation in this field. Nowadays, the cement …
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Evaluation of linear and nonlinear vibration methods to characterize induced microstructural damage in portland cement-based materials
… methods to characterize the behavior of portland cement paste and mortar subjected to oven drying and alkali silica reaction (ASR) activity, respectively, and thus to infer and to distinguish the resulting microstructural changes. The effect of internal moisture content on the vibration responses …
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Sustainable Utilisation of Raw Sewage Sludge (RSS) as a Water Replacement in Cement-Based Materials Containing Unprocessed Fly Ash
… for the production of sustainable construction materials. This research programme has therefore examined the performance of cement-based materials containing Raw Sewage Sludge (RSS) as a water replacement and unprocessed fly ash as cement replacement. Mortar and concrete mixes incorporating …
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Invariant mechanical properties of calcium-silicate-hydrates (C-H-S) in cement-based materials : instrumented nanoindentation and microporomechanical modeling
Random porous solids such as bone and geomaterials exhibit a multiphase composite nature, characterized by water-filled pores of nm- to m-scale diameter. The natural synthesis and operating environments of such materials significantly alters phase composition and multiscale structural …
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Chemomechanics of calcium leaching of cement-based materials at different scales : the role of CH-dissolution and C-S-H degradation on strength and durability performance of materials and structures
Calcium leaching is a durability threat for cement-based materials employed in critical infrastructures, such as Nuclear Waste Storage Systems. This thesis presents a comprehensive study of the material and structural consequences of calcium leaching on the strength and deformation behavior of …
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Advancements in concrete material sustainability : supplementary cementitious material development and pollutant interaction
Calcined clay and fly ash supplementary cementitious materials (SCMs) used in cement based materials were examined for their chemical and mechanical performance, as well as their pollutant interaction. This dissertation addresses three primary research questions, namely: (i) can zincite additions …
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Metodología para la evaluación de la sostenibilidad en ladrillos de mortero dopados con triturado de hueso de oliva
… (unused tires and olive pits) incorporated into cement-based materials for use in construction (specifically GERO mortar bricks). This initiative is framed in the concept of "Sustainable Construction", which seeks to address three fundamental pillars from the point of view of engineering and …
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Understanding effects of pre-soaked lightweight aggregate on volume stability of mortar and concrete mixtures
… internally cured mixture using expansive cement. The expansive nature of Calcium Sulfoaluminate (CSA)–based cements can be used to enhance the resistance against shrinkage cracking by inducing compressive stress in concrete. It is shown that combining CSA with internal curing is mutually …
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Effectiveness of high strength repair mortars in structural patch repairs of concrete members under axial compression
… into the performance and efficacy of repair materials used in structural concrete patch repair applications. The repercussions of this have led to the development of repair standards and guidelines that fail to adequately cover requirements for structural repair, often poor repair material …
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