Late Age Dynamic Strength of High-Volume Fly Ash Concrete with Nano-Silica and Polypropylene Fibres

• Published in: Crystals (Basel) Vol. 10; no. 4; p. 243
• Main Authors: Mussa, Mohamed H., Abdulhadi, Ahmed M., Abbood, Imad Shakir, Mutalib, Azrul A., Yaseen, Zaher Mundher
• Format: Journal Article
• Language: English
• Published: MDPI AG 01-04-2020
• Subjects: Concretes; critical damage; curing age; dif; Dynamic testing (Materials); hvfans concrete; Mechanical properties; Methods; shpb test; Testing; toughness; Malaysia
• ISSN: 2073-4352; 2073-4352
• DOI: 10.3390/cryst10040243

The dynamic behaviour of high-volume fly ash concrete with nano-silica (HVFANS) and polypropylene fibres at curing ages of 7 to 90 days was determined by using a split Hopkinson pressure bar (SHPB) machine. At each curing age, the concrete samples were laboratory tested at different temperatures conditions under strain rates reached up to 101.42 s−1. At room temperature, the results indicated that the dynamic compressive strength of plain concrete (PC) was slightly higher than HVFANS concrete at early curing ages of 7 and 28 days, however, a considerable improvement in the strength of HVFANS concrete was noted at a curing age of 90 days and recorded greater values than PC owing to the increase of fly ash reactivity. At elevated temperatures, the HVFANS concrete revealed a superior behaviour than PC even at early ages in terms of dynamic compressive strength, critical strain, damage and toughness due to increase of nano-silica (NS) activity during the heating process. Furthermore, equations were suggested to estimate the dynamic increase factor (DIF) of both concretes under the investigated factors.