Sökning: "hydration heat"

Visar resultat 1 - 5 av 15 uppsatser innehållade orden hydration heat.

1. 1. Development and Evaluation of an Enzyme-Based Sunscreen

   Master-uppsats, Lunds universitet/Bioteknik; Lunds universitet/Bioteknik (master)

   Författare :Karolina Eriksson Torfgård; [2023]
   Nyckelord :Enzyme activity; UV-filter; Protease; Biotechnology; Technology and Engineering;

   Sammanfattning : Ultraviolet radiation (UVR), specifically of UVA and UVB, has been associated with the development of both photoaging and photo-carcinogenesis, potentially leading to cancer. The use of sun protection in the form of UV filters is known to minimize these damages. LÄS MER

3. 2. Modelling of a Heat Conduction Calorimeter Used in Cement Plant Automation

   Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Institutionen för reglerteknik

   Författare :Hassan Alzeidi; [2022]
   Nyckelord :Technology and Engineering;

   Sammanfattning : A model is used to describe a system physically or mathematically and to give information about changes in the system variables. Physical knowledge about the system and its quantities can be useful to build a physical model obeying the laws of nature. LÄS MER

4. 3. Effekt av fasändringsmaterial på hydratiseringprocessen hos Portlandcement: En experimentell studie

   Kandidat-uppsats, KTH/Byggteknik och design

   Författare :Lubna Al-Khaffaf; Hala Khalil; [2020]
   Nyckelord :Phase change material PCM ; established environmental requirements; hydration properties; heat flow; cement hydration; set time; energy consumption; slump flow; density; compressive strength.; Fasändringsmaterial PCM ; etablerade miljökraven; hydratiseringsegenskaperna; värmeflöde; cementhydratisering; inställningstid; energiförbrukning; slumflöde; densitet; tryckhållfasthet;

   Sammanfattning : The Phase change materials (PCM) have the ability to absorb and release heat as the temperature changes from high to low temperature and vice versa. The use of phase change materials has increased in the construction sector due to the established environmental requirements and the various application benefits, especially in the thermal comfort of building applications and construction of sustainable infrastructure around the world (Berardi and Gallardo, 2019). LÄS MER

5. 4. Självuttorkning i betong med aluminatrika tillsatsmaterial

   Master-uppsats, Lunds universitet/Avdelningen för Byggnadsmaterial

   Författare :Björn Grahn; Aleksandra Talevska; [2019]
   Nyckelord :Betong; cement; cementpasta; uttorkning; självuttorkning; tillsatsmaterial; aluminatrika tillsatsmaterial; värmeutveckling; ettringit; aluminat; relativ fuktighet; RF; CSA; CA; Technology and Engineering;

   Sammanfattning : This master thesis work concerns the effect of high-alumina additives on the selfdesication of concrete. The purpose of the work was to examine the possibilities to optimize the binder-content of concrete with regards to self-desiccation. Two highalumina additives have been examined. LÄS MER

7. 5. 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