Location
University of Leeds
Keywords
Portland cement; High-volume fly ash concrete; Compressive strength; Pozzolanic Index; Sustainability
Abstract
The increase of carbon emission due to annual growth of Portland cement (PC) production has enforced research into the development of sustainable green concrete using a range of readily available industrial waste materials. The present study is focused on developing two high volume fly ash (HVFA) concretes with cement replacement levels 65% (HVFA‒65) and 80% (HVFA‒80). Initially, the required lime for both HVFA concrete mixes were determined, and then the optimized mix design identified, based on 28-day strength, by varying the fly ash‒lime combination. The optimized mixes achieved a compressive strength of 53MPa and 40MPa, for HVFA‒65 and HVFA‒80 concretes, respectively. Similar to PC concrete, both HVFA concretes showed high resistance to chloride penetration, water absorption and carbonation at 28 days. The early stage strength development is dependent upon the matrix produced in the specific HVFA concrete, which is itself dependent upon the number of unreacted fly ash spheres.
Included in
Design of Ternary Blend High-Volume Fly Ash Concrete Mixes using Hydrated Lime
University of Leeds
The increase of carbon emission due to annual growth of Portland cement (PC) production has enforced research into the development of sustainable green concrete using a range of readily available industrial waste materials. The present study is focused on developing two high volume fly ash (HVFA) concretes with cement replacement levels 65% (HVFA‒65) and 80% (HVFA‒80). Initially, the required lime for both HVFA concrete mixes were determined, and then the optimized mix design identified, based on 28-day strength, by varying the fly ash‒lime combination. The optimized mixes achieved a compressive strength of 53MPa and 40MPa, for HVFA‒65 and HVFA‒80 concretes, respectively. Similar to PC concrete, both HVFA concretes showed high resistance to chloride penetration, water absorption and carbonation at 28 days. The early stage strength development is dependent upon the matrix produced in the specific HVFA concrete, which is itself dependent upon the number of unreacted fly ash spheres.
