| Autor: |
Taher A. Tawfik, Khaled Aly Metwally, S.A. EL-Beshlawy, Doha M. Al Saffar, Bassam A. Tayeh, Hassan Soltan Hassan |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Předmět: |
|
| Zdroj: |
Journal of King Saud University: Engineering Sciences, Vol 33, Iss 8, Pp 581-588 (2021) |
| Druh dokumentu: |
article |
| ISSN: |
1018-3639 |
| DOI: |
10.1016/j.jksues.2020.06.007 |
| Popis: |
The sustainable utilization of demolition wastes in the production of building materials is regarded as an eco-efficient approach for conserving naturally-occurring resources accompanied by resolving the environmental problems caused by these wastes. Accordingly, the motivation behind this work is evaluating the single and combined effect of nano-waste ceramic (NWC) and nano silica (NS) on the performance of Portland cement concrete. Portland cement was individually replaced by different contents of NWC (2–10 wt%) and NS (1–4 wt%). Another mixture was designed to evaluate the synergetic impact of NS and NWC mixture (3 and 6 wt%) on the performance of concrete. The mechanical (flexural, splitting tensile and compressive strengths) and nondestructive tests (Ultrasonic Pulse Velocity ‘UPV’) were carried on the control and nano-modified hardened concrete. The results showed that the increase of NWC content up to 6 wt% has resulted in a noticeable increment in strengths at all curing ages, followed by a reduction in strengths when NWC content reaches 10 wt%. However, the usage of 10% NWC illustrates a slight enhancement in strengths compared to control sample. All over the mixtures, the nano-silica modified samples demonstrate a slight enhancement in the mechanical properties compared to NWC. The highest mechanical properties accompanied by the shortest transmitted waves were achieved by the hardened samples having the mixture of 3 wt% NS and 6 wt% NWC. This means that the sustainable utilization of NWC not only improves the performance of concrete but also resolves the environmental problems caused by this waste. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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