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Increasing Compressive Strength of Recycled Aggregate Concrete Using High Fineness Bottom Ash Blended Cement
Concrete requires a significant amount of virgin materials to manufacture. To conserve resources and lower construction costs, recycled concrete aggregate can be used as a construction material and replace the use of natural aggregate. However, compared to natural aggregate, there are inherent deficiencies in recycled concrete aggregate such as lower compressive strength, durability and density, higher water absorption, and a weaker aggregate-cement interfacial transition zone. For reutilization in concrete, the weak interfacial properties need to be improved without comprising overall cost of the concrete. In this paper, a recycled and low-cost sub-bituminous coal bottom ash is pulverized and reutilized as a supplementary cementitious material to increase the strength activity of the cement matrix and interfacial zones. The bottom ash is blended with a type I cement at 9% replacement and mixed using a three-stage protocol: (1) dispersing the ash in water-superplasticizer solution with a homogenizer, (2) partially mixing the bottom ash solution with the aggregate, and (3) mixing in the type I cement and remaining bottom ash solution. The concrete is cured and tested at 28 and 110 days. The result of the study indicates that the addition of the pulverized bottom ash can (1) increase the compressive strength of the recycled aggregate concrete by 16% relative to a control, and (2) dispersing the bottom ash within a water-superplasticizer solution can increase the compressive strength of the recycled aggregate concrete by 12%.
Increasing Compressive Strength of Recycled Aggregate Concrete Using High Fineness Bottom Ash Blended Cement
Concrete requires a significant amount of virgin materials to manufacture. To conserve resources and lower construction costs, recycled concrete aggregate can be used as a construction material and replace the use of natural aggregate. However, compared to natural aggregate, there are inherent deficiencies in recycled concrete aggregate such as lower compressive strength, durability and density, higher water absorption, and a weaker aggregate-cement interfacial transition zone. For reutilization in concrete, the weak interfacial properties need to be improved without comprising overall cost of the concrete. In this paper, a recycled and low-cost sub-bituminous coal bottom ash is pulverized and reutilized as a supplementary cementitious material to increase the strength activity of the cement matrix and interfacial zones. The bottom ash is blended with a type I cement at 9% replacement and mixed using a three-stage protocol: (1) dispersing the ash in water-superplasticizer solution with a homogenizer, (2) partially mixing the bottom ash solution with the aggregate, and (3) mixing in the type I cement and remaining bottom ash solution. The concrete is cured and tested at 28 and 110 days. The result of the study indicates that the addition of the pulverized bottom ash can (1) increase the compressive strength of the recycled aggregate concrete by 16% relative to a control, and (2) dispersing the bottom ash within a water-superplasticizer solution can increase the compressive strength of the recycled aggregate concrete by 12%.
Increasing Compressive Strength of Recycled Aggregate Concrete Using High Fineness Bottom Ash Blended Cement
Brake, Nicholas A. (author) / Oruji, Soheil (author) / Haselbach, Liv (author)
International Conference on Transportation and Development 2018 ; 2018 ; Pittsburgh, Pennsylvania
2018-07-12
Conference paper
Electronic Resource
English
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