Avancerad sökning

Visar resultat 1 - 5 av 9 uppsatser som matchar ovanstående sökkriterier.

1. 1. Fabricability of a high alloy tool steel produced with LPBF, with a focus on part geometry

   Master-uppsats, Karlstads universitet

   Författare :Zulfaqar Abdelamir; [2021]
   Nyckelord :Addtive Manufacturing; Laser Powder Bed Fusion; High alloy Cold Work Tool Steel; Addtiv Tillverkning; LPBF; Höglegerat kallbearbetningsstål;

   Sammanfattning : Additive manufacturing (AM) is a promising manufacturing process that provides that ability to fabricate components with complex geometries with relatively low lead times compared to other manufacturing processes. This allows for more freedom of design, as prototypes can easily be produced throughout the development process. LÄS MER

3. 2. Bacteria - based self - healing mortar with bio - plastic healing agents : Comparative analysis on quantification and characterization of self-healing by various experimental techniques

   Master-uppsats, KTH/Betongbyggnad

   Författare :Rahul Roy; [2020]
   Nyckelord :Mortar; crack; autonomous healing; bacteria; bioplastic; lactic acid derivatives PLA ; alkanoate derivatives AKD ; internal crack geometry; quantification; characterization; statistical analysis; Bruk; sprickbildning; självläkning; bakteriebaserademedel; bioplast; mjölksyrederivat PLA ; alkanoatderivat AKD ; inre sprickbildning; kvantifiering; karakterisering; statistisk analys;

   Sammanfattning : Crack formation in concrete structures due to various load and non-load factors leading to degradation of service life is very common. Repair and maintenance operations are, therefore, necessary to prevent cracks propagating and reducing the service life of the structures. LÄS MER

4. 3. Simulation of Hardening of the MahanaKhon Tower Mat Foundation

   Master-uppsats, KTH/Betongbyggnad

   Författare :Zakaria Kazi-tani; [2019]
   Nyckelord :Hydration; MahanaKhon tower; mat foundation; young concrete; temperature development; thermal stresses; cracking; fly ash; finite element analysis; COMSOL Multiphysics; Hydratation; MahanaKhon tower; bottenplatta; ung betong; temperaturutveckling; termiska spänningar; sprickbildning; flygaska; finita elementanalys; COMSOL Multiphysics;

   Sammanfattning : Cement hydration is the result of a series of simultaneous chemical reactions occurring during the production of concrete. An excessive amount of heat is generated, which consequently may give rise to thermal stresses and cause early age cracks in concrete that may affect its structural integrity, and load bearing capacity. LÄS MER

5. 4. Alternative methods to prevent thermal cracking in concrete

   M1-uppsats,

   Författare :Alexander Barchin; Navid Sedighi; [2019]
   Nyckelord :Massive concrete structures; heat development; cement hydration; temperature reduction; cracking; fly ash; ice; coarse aggregates; cooling methods; practical tests.; Massiva betongkonstruktioner; värmeutveckling; cementhydrataion; temperaturreducering; sprickbildning; flygaska; is; grov ballast; kylningsmetoder praktiska försök.;

   Sammanfattning : In the construction industry, concrete is the most common material, because of its good properties such as compressive strength and endurance. Concrete is a composition of several different materials where one of the main components is cement. When the hydration process starts, large amount of heat is generated. LÄS MER

7. 5. Temperature reduction during concrete hydration in massive structures

   Master-uppsats, KTH/Betongbyggnad

   Författare :Sandra Lagundzija; Marie Thiam; [2017]
   Nyckelord :Massive concrete structures; hydration heat; temperature reduction; crack risk; mineral additions; concrete cooling; Massiva betongkonstruktioner; värmeutveckling; temperaturreducering; sprickbildning; mineraltillsatser; kylning av betong;

   Sammanfattning : Concrete is one of the most used building materials in the world because of its good properties. However, cement which is one of the main components in concrete, produces a high amount of heat during the hydration process. The generated heat leads to temperature rise inside the structure. LÄS MER