Potential of finely ground limestone powder to benefit ultra-high performance concrete mixtures
| Autor: | Jay Shannon, Jedadiah F. Burroughs, Danny W. Harrelson, Todd S. Rushing, Kevin Yi, Quinn B. Gutierrez |
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| Rok vydání: | 2017 |
| Předmět: |
Cement
Toughness Materials science Composite number 0211 other engineering and technologies Mixing (process engineering) 02 engineering and technology Building and Construction engineering.material 021001 nanoscience & nanotechnology Durability Compressive strength Filler (materials) 021105 building & construction engineering General Materials Science Cementitious Composite material 0210 nano-technology Civil and Structural Engineering |
| Zdroj: | Construction and Building Materials. 141:335-342 |
| ISSN: | 0950-0618 |
| Popis: | Ultra-high performance concrete is a specialized class of cementitious materials notable for very high compressive strength, increased toughness, and improved durability relative to conventional concrete. Due to its high cement content and the use of very finely ground crystalline silica, ultra-high performance concrete has a greater cost and CO2 footprint than normal concrete. Potential health concerns can also arise due to repeated inhalation of crystalline silica powder during production. Finely ground limestone powder was hypothesized as a potential filler to help minimize these negative aspects when used as either a partial or full mass replacement of similarly sized cement and silica powder. Limestone powder was shown to have a positive effect on fresh properties of the composite including mixing time and workability. Small replacements of cement were shown to have beneficial effects on compressive strength. Scanning electron microscopy showed that limestone powder replaced unreacted materials without significantly impacting hydration reactions. |
| Databáze: | OpenAIRE |
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