A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Suitability of Brown Coal Fly Ash for Geopolymer Production
The use of low-calcium Class F fly ash both as a replacement material for cement and to produce geopolymers has become established practice. However, much of the fly ash produced globally is either high-calcium Class C or brown coal (BC) fly ash, whose use as a cement replacement or geopolymeric material is very limited. This study reports the results of using BC fly ash from three separate sources to assess the feasibility of geopolymer concrete manufacturing and factors affecting the compressive strength of the geopolymeric material produced. The effects of the chemical composition of the raw fly ash, alkali modulus of the activator, and mineralogical properties of the raw material are reported. The results show that the manufacture of geopolymer mortar from BC fly ash was feasible, with compressive strengths of up to 50 MPa obtained. The key factors in selecting BC fly ash and determining its geopolymer compressive strength were the combined aluminate-silicate content of raw material, reactive amorphous content, and zeta potential. The data also emphasize the need for careful consideration of the modification of the activator modulus when designing a specific geopolymer mix.
Suitability of Brown Coal Fly Ash for Geopolymer Production
The use of low-calcium Class F fly ash both as a replacement material for cement and to produce geopolymers has become established practice. However, much of the fly ash produced globally is either high-calcium Class C or brown coal (BC) fly ash, whose use as a cement replacement or geopolymeric material is very limited. This study reports the results of using BC fly ash from three separate sources to assess the feasibility of geopolymer concrete manufacturing and factors affecting the compressive strength of the geopolymeric material produced. The effects of the chemical composition of the raw fly ash, alkali modulus of the activator, and mineralogical properties of the raw material are reported. The results show that the manufacture of geopolymer mortar from BC fly ash was feasible, with compressive strengths of up to 50 MPa obtained. The key factors in selecting BC fly ash and determining its geopolymer compressive strength were the combined aluminate-silicate content of raw material, reactive amorphous content, and zeta potential. The data also emphasize the need for careful consideration of the modification of the activator modulus when designing a specific geopolymer mix.
Suitability of Brown Coal Fly Ash for Geopolymer Production
Dirgantara, Rahmat (author) / Gunasekara, Chamila (author) / Law, David W. (author) / Molyneaux, Tom K. (author)
2017-10-12
Article (Journal)
Electronic Resource
Unknown
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