The use of limestone to replace physical filler of quartz powder in UHPFRC
| Autor: | Juhyuk Moon, Sung-Hoon Kang, Kiang Hwee Tan, Yeonung Jeong |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Cement
Filler (packaging) Materials science 0211 other engineering and technologies Nucleation 02 engineering and technology Building and Construction 021001 nanoscience & nanotechnology Key features 021105 building & construction General Materials Science Composite material 0210 nano-technology Quartz Shrinkage |
| Zdroj: | Cement and Concrete Composites. 94:238-247 |
| ISSN: | 0958-9465 |
| DOI: | 10.1016/j.cemconcomp.2018.09.013 |
| Popis: | One of the key features of ultra-high performance fiber-reinforced concrete (UHPFRC) is the inclusion of quartz powder (QP) as a filler to optimize granular packing. However, QP has not been compared against limestone powder (LP) in terms of the filler effects, although it can affect hydration characteristics, strength development, and autogenous shrinkage of the concrete. In this study, the effectiveness of LP as a filler is evaluated against that of QP in order to verify its potential for use as a functional and human-friendly filler in UHPFRC. For this purpose, five types of fillers consisting of similar-sized QP and LP were designed while maintaining the same water-to-cement (w/c) and superplasticizer-to-cement (sppl/c) ratios. The early age strength increased by up to 12% depending on the LP content, due to the filler effect which accelerates cement hydration by providing a preferential surface for nucleation. Although the 28-day strength was 4%–7% lower than that of the classical UHPFRC containing QP, the 91-day strength was 1%–4% higher. The early age shrinkage was also accelerated by the filler effect of the LP, but its duration was shortened in proportion to the LP content. |
| Databáze: | OpenAIRE |
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