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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 49 for “"geopolymer"”.
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Biologically reinforced geopolymer composites
… the characteristics of biologically reinforced geopolymers is presented. Cork particle reinforced sodium geopolymer composites were shown to have a maximum flexural strength of 2.5 MPa, and an average strain-to-failure of 0.75%. Abaca fiber reinforced sodium geopolymer composites had flexural …
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Geopolymer-derived ceramics and composites
The development of ceramics and composites from geopolymer precursors is leading to exciting new avenues in ceramic synthesis and composite applications. In this work, we developed, synthesized, and characterized materials derived from geopolymers for use in extreme environments. In the first …
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Analysis and reproduction of geopolymer concrete
Geopolymers are inorganic polymers based on aluminosilicates that are produced from synthesizing pozzolanic compounds or aluminosilicate source materials with highly alkaline solutions. Geopolymer concrete is a stronger, more durable and more environmentally friendly alternative to ordinary …
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Setting and nanostructural evolution of metakaolin geopolymer
Geopolymers are being promoted as a sustainable alternative to the ordinary cements mainly because their production is associated with much less CO2 emissions. They also show advantages including compressive strength comparable to portland cements, high temperature resistance, and stability under …
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Material Design and Durability Characterization of “Non-Brittle” Geopolymer
Geopolymers are inorganic polymers that have resulted in wide scientific interest and broad development of applications. They possess intriguing characteristics that bridge polymer science and ceramics. Many inexpensive earth-abundant minerals and industrial wastes can form geopolymers; this …
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Geopolymer composites and their applications in stress wave mitigation
… inorganic polymer, also known as “geopolymer” which emits about 80% less CO2 than OPC. Therefore, the chemical, mechanical, thermal and electrical properties of geopolymers have been of interest for the past two decades. The processes and microstructures of potassium-based …
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Geopolymer-based moisture and chloride sensors for nuclear concrete structures
… The work in this thesis demonstrates that geopolymer binders - a class of adhesive concrete repair materials - can be electrically interrogated and used to monitor moisture and chloride concentrations on concrete surfaces, or as stand-alone sensors. This can be achieved without sacrificing …
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From Foamed Concrete to Geopolymer Foamed Concrete: Design, Properties and Application
L'abstract è presente nell'allegato / the abstract is in the attachment
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Understanding the role of slag on geopolymer hardening and microstructural development
… age properties for successful application of geopolymer as an alternative binder. The early age properties like hardening (stiffening) and setting will determine the removal of formwork and thus the time of construction. The study was performed on user-friendly geopolymers obtained by using …
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The development of a geopolymer binder from the interbasaltic laterites of Northern Ireland
Over the last number of years, geopolymers and Alkali Activated Cementitious Materials (AACM) have been proposed as low carbon alternatives to Portland Cement, offering up to 80% reduction in CO¬2 emissions. Historically, geopolymer technology has focused on Ground Granulated Blastfurnace Slag …
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On the Development of 8,000 psi Geopolymer Mortar for Practical Use in Field Applications
… are several perceived benefits from the use of geopolymer binder as an alternative to ordinary portland cement in concrete materials, it is not widely used in field applications. Geopolymer materials have no set guidelines for mixture design and often require heat curing to facilitate strength …
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Development and performance of class F fly ash based geopolymer concretes against sulphuric acid attack
Geopolymer concretes synthesised from composite class F fly ashes and a mixed alkaline activator were optimised by use of Taguchi orthogonal design method. The optimised mix achieved a compressive strength at the age of 28 days of 70 and 58 MPa after initial curing at 70°C for 12 hours and at 23°C …
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Applications of Geopolymer in Civil Engineering: Feasibility Study of Loess Stabilization and Waste Concrete Recycling
… civil engineers for the sustainable development. Geopolymer, which is an inorganic material formed by alkaline activation of aluminia- and silica-containing material through a polycondensation process, could be synthesized from various industrial by-products, such as fly ash and furnace slag, with …
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Flexural Behaviour of Geopolymer Concrete T-beams Reinforced with FRP or Hybrid FRP/Steel bars
… be replaced with binders that emit less CO2. Geopolymer binder is an alternative to Portland cement that does not emit CO2 during manufacture. GPC reinforced with any material should provide a building system that is durable, economical, and ecologically friendly. The main aim of this study is …
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Understanding effects of silicon/aluminum ratio and calcium hydroxide on chemical composition, nanostructure and compressive strength for metakaolin geopolymers
… composition and nanostructure for metakaolin geopolymers. The second was to determine how the composition and nanostructure correlate with mechanical properties of the geopolymer. For this study, the geopolymers were made using metakaolin, calcium hydroxide, sodium hydroxide, sodium silicate …
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Development of Optimization Models for the Set Behavior and Compressive Strength of Sodium Activated Geopolymer Pastes
… materials. One promising material known as a geopolymer can be used as a portland cement replacement and in this capacity emits around 67% less carbon dioxide. In addition to potentially reducing carbon emissions, geopolymers can be synthesized with many industrial waste products such as fly …
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Irradiation effects on geopolymer and additively manufactured 316H stainless steel and porosity in equine hoof wall
… environments. They include metakaolin-based geopolymers for nuclear shielding, additively manufactured (AM) 316H stainless steel (SS) for radiation resistance, and equine hoof walls serving as bioinspiration for impact-resistant materials designs. First, I explored a potassium-based …
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Nucleation seeding in metakaolin geopolymers
Geopolymers are a class of amorphous, aluminosilicate-based binders proposed as an alternative to the cement binders used commonly in the construction industry. One of the main advantages of using geopolymer concrete is the fact that waste materials like fly ash are used as precursors for its …
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Novel, inorganic composites using porous, alkali-activated, aluminosilicate binders
Geopolymers are an inorganic polymeric material composed of alumina, silica, and alkali metal oxides. Geopolymers are chemical and fire resistant, can be used as refractory adhesives, and are processed at or near ambient temperature. These properties make geopolymer an attractive choice as a matrix …
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