Developing strain-hardening ultra-rapid-hardening mortar containing high-volume supplementary cementitious materials and polyethylene fibers
| Autor: | Doo Yeol Yoo, Booki Chun, Wonsik Shin, Yun Sik Jang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Silica fume Ultra-rapid-hardening mortar 02 engineering and technology Strain-hardening behavior 01 natural sciences Ettringite Biomaterials chemistry.chemical_compound 0103 physical sciences Ultimate tensile strength Composite material 010302 applied physics Cement Mining engineering. Metallurgy Metals and Alloys Polyethylene fiber TN1-997 Strain hardening exponent Polyethylene 021001 nanoscience & nanotechnology Cement kiln dust Surfaces Coatings and Films Cement kiln chemistry Ceramics and Composites Cementitious Mortar 0210 nano-technology |
| Zdroj: | Journal of Materials Research and Technology, Vol 13, Iss, Pp 1934-1945 (2021) |
| ISSN: | 2238-7854 |
| Popis: | This study aims to develop a robust strain-hardening ultra-rapid-hardening mortar (URHM) with high-volume cementitious materials and polyethylene (PE) fibers. To achieve this, the combined effect of cement kiln dust (CKD) and silica fume (SF) on the initial hydration process of ultra-rapid-hardening cement and the tensile performance of URHM was analyzed. Optimum amounts of CKD and SF of 0.15 and 0.2, respectively, by weight ratios to cement, were determined to develop the strain-hardening URHM containing 2% PE fibers. As a result, the tensile strength of 7.3 MPa, strain capacity of 5.12%, and energy absorption capacity prior to tension softening of 297.5 kJ/m3, respectively, were achieved at a very early age (4 h) of air-drying curing. The tensile performance of URHM deteriorated when the CKD content was 0.4 or greater, regardless of the SF content. A lower SF content of 0.2 was effective in terms of the tensile performance enhancement compared with the higher content of 0.4 up to the CKD content of 0.2, but they became similarly lower at higher CKD contents due to insufficient initial hydration. |
| Databáze: | OpenAIRE |
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