|
|
Influence of ettringite formation on mechanical properties of zinc doped cements.
Kunovský, Ondřej ; Matějka, Lukáš (referee) ; Šiler, Pavel (advisor)
This bachelor thesis deals with the study of the effect of hydration accelerators in cement pastes doped with zinc ions. Their influence on hydration reactions, mechanical properties and the amount of ettringite formed was studied. CEM I 42.5 R cement was used and zinc was added in the form of ZnO in an amount of 1 wt. % of Zn relative to cement content. Strengths were measured over a time horizon of 98 days. In addition, analyzes by SEM, XRD and DTA methods were performed on selected samples to determine the amount of ettringite. It has been found that compressive strengths can also decrease during hydration. At this decrease, SEM, XRD and DTA showed a reduction in the amount of ettringite in the sample.
|
|
|
Influence of ettringite formation on mechanical properties of zinc doped cements.
Kunovský, Ondřej ; Matějka, Lukáš (referee) ; Šiler, Pavel (advisor)
This bachelor thesis deals with the study of the effect of hydration accelerators in cement pastes doped with zinc ions. Their influence on hydration reactions, mechanical properties and the amount of ettringite formed was studied. CEM I 42.5 R cement was used and zinc was added in the form of ZnO in an amount of 1 wt. % of Zn relative to cement content. Strengths were measured over a time horizon of 98 days. In addition, analyzes by SEM, XRD and DTA methods were performed on selected samples to determine the amount of ettringite. It has been found that compressive strengths can also decrease during hydration. At this decrease, SEM, XRD and DTA showed a reduction in the amount of ettringite in the sample.
|
|
|
Business and Investment Cooperation of China and selected Middle Eastern countries with a focus on oil trade
Kunovský, Ondřej ; De Castro, Tereza (advisor) ; Vošta, Milan (referee)
The aim of this master thesis is to find out what the drivers of Chinese oil imports are. Also, it highlights an oil demand from three Middle Eastern countries. The reason for the topic was a rising Chinese oil demand and its interest in investments in oil industry. The thesis is divided into four parts. The first part describes development of mutual relations with the Middle East and a Chinese economy development. The second chapter introduces an economic development of Saudi Arabia, Iran and the United Arab Emirates and explains their dependency on oil exports. Next part identifies internal and external oil trade drivers and highlights various investment projects. Then, the last chapter presents the perspectives of the New Silk Road and highlights projects with an impact on oil trade.
|
guest ::
