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Verification of ECPC and EPCC concepts for the use of the k-value of selected active admixtures with mixed cement
Prudil, Matěj ; Slánský,, Bohuslav (referee) ; Hela, Rudolf (advisor)
This bachelor thesis deals with the verification of the replacement of blended cement, latent hydraulic and pozzolanic additions used in the production of concrete. In the theoretical part of this thesis, the use of blended cements in concrete production is firstly described and the effect of additions on the properties of fresh and hardened concrete is briefly discussed. The next chapters focus on fly ash and blast furnace slag as Type II additions and their basic properties. The theoretical part also focuses exclusively on the concepts used to replace cement with active additions. These concepts are successively presented in this thesis as: K-value concept, Equivalent concrete performance concept (ECPC) and Equivalent performance of combinations concept (EPCC). In the experimental part, the properties of the test mortars with cement replacement by concrete active additions (slag from Kotouč Štramberk and high temperature fly ash from Opatovice and Chvaletice) are compared. The above mentioned concepts for the replacement of cement with active additions are evaluated in the experimental part from the economic point of view (prices per m3 of concrete) and ecological point of view (calculation of carbon footprint in t CO2 per m3 of concrete production). In order to compare these benefits, a concrete mix of strength class C30/37 is proposed according to each concept. From the knowledge gained in the development of the ECPC and EPCC concepts, a q-value concept is proposed in the experimental part. In the last chapter of the experimental part, the resulting values of this work are compared with the experimental work already carried out to replace Portland cement with identical active admixtures.
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Study of the concept of K-value and efficiency index for fly ash and slag and their assessment and determination for concrete
Šperling, Petr ; Hela, Rudolf (referee) ; Hubáček, Adam (advisor)
This bachelor thesis deals with the use of active admixtures as a substitute for cement in concrete, specifically power plant fly ash and blast furnace slag. When using power plant fly ash and blast furnace slag as a substitute for cement in concrete, it is necessary to know their effect on concrete and to assess the different properties compared to concrete in which these admixtures are not used. This work will summarize the existing knowledge of the properties of power plant fly ash and blast furnace slag and their effect on fresh and hardened concrete. Furthermore, the possibilities of determining the efficiency index and the so-called k-value concept, which are used to assess the effect on cement mortar and concrete when replacing cement with an active admixture, will be summarized. In the experimental part, emphasis will be placed on determining the k-value. This is described in European technical standards in a very general way and is not sufficiently detailed for specific active ingredients.
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