Event Title

Optimum utilization of fly ash for achieving properties of high performance concrete

Session

Civil Engineering, Infrastructure and Environment

Description

Coal fly ash is obtained as final product by combustion of coal in power plants during process of producing electrical energy. In Kosovo electricity production and its generation is dependent largely based on coal burning power plants. Currently 97% of electrical energy is produced only from coal and based on reserves of this mine and the situation of other resources it seems that for long time coal will be the only source of energy. As result average of coal fly ash is around 1,16million t/year. [1] So, considering this situation, idea of substituting different percentage of cement with coal fly ash in producing concrete will help to reach the point of recycling waste material, reducing amount of cement production, increasing quality of concrete, protecting environment and it has positive effect in economical aspect too. The literature is rich in publications regarding influence of fly ash in concrete, especially for low-calcium fly ash (less than 10% of CaO) [2-4] but suitability of high-calcium fly ash in concrete still is considered with skepticism.[5] These happen especially related to chemical compositions high content of CaO and SO3 can effect volume stability and concrete stability.[6,7,8] Following this approach, an experimental investigation of quality of concrete with different percentage of content of high-calcium fly ash is carried out. In focus is high performance concrete C 50/60 and all work took place in concrete lab according to EN 206-1.

Keywords:

fly ash, compressive strength, chemical analyses, optimization

Session Chair

Feti Selmani

Session Co-Chair

Anjeza Alaj

Proceedings Editor

Edmond Hajrizi

ISBN

978-9951-437-69-1

Location

Pristina, Kosovo

Start Date

27-10-2018 10:45 AM

End Date

27-10-2018 12:15 PM

DOI

10.33107/ubt-ic.2018.61

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Oct 27th, 10:45 AM Oct 27th, 12:15 PM

Optimum utilization of fly ash for achieving properties of high performance concrete

Pristina, Kosovo

Coal fly ash is obtained as final product by combustion of coal in power plants during process of producing electrical energy. In Kosovo electricity production and its generation is dependent largely based on coal burning power plants. Currently 97% of electrical energy is produced only from coal and based on reserves of this mine and the situation of other resources it seems that for long time coal will be the only source of energy. As result average of coal fly ash is around 1,16million t/year. [1] So, considering this situation, idea of substituting different percentage of cement with coal fly ash in producing concrete will help to reach the point of recycling waste material, reducing amount of cement production, increasing quality of concrete, protecting environment and it has positive effect in economical aspect too. The literature is rich in publications regarding influence of fly ash in concrete, especially for low-calcium fly ash (less than 10% of CaO) [2-4] but suitability of high-calcium fly ash in concrete still is considered with skepticism.[5] These happen especially related to chemical compositions high content of CaO and SO3 can effect volume stability and concrete stability.[6,7,8] Following this approach, an experimental investigation of quality of concrete with different percentage of content of high-calcium fly ash is carried out. In focus is high performance concrete C 50/60 and all work took place in concrete lab according to EN 206-1.