Effects of Nano-Sio2 from Rice Husk Ash and Silica Fume on the Engineering Properties of Mortar and Concrete

  • Van-Bach Le, Huu-Bang Tran, Vu To-Anh Phan

Abstract

This paper presents a detailed study focused on investigating the effects of using Nano-SiO2 (NS) and silica fume (SF) on engineering properties of mortar and concrete. Specimens with various NS and/or SF contents were tested in SEM, compressive strength, flexural strength and elastic modulus equipments. All specimens were cured at the ages of 3-, 7-, 28-, and 60-days with the temperature of 25±2°C. For mortar, total five mixtures were prepared for experimental test by adjusting the percentages of Portland cement replacement with NS of 0%, 0.5%, 1.0%, 1.5%, and 2.0% by weight and water/binder ratio of 0.5 and binder/sand ratio of 1:3, respectively. Test results revealed that the compressive and flexural strengths of cement-mortars increased with the upward adjustment in NS content in range of 0-2.0 %; however, the strength reached the highest value with NS content of 1.0%. SEM image showed that the structures of NS cement-mortar was more homogeneous and more density than conventional mortar sample. Furthermore, for concrete, three types of concrete grades were prepared, including 30 MPa, 35 MPa, and 40 MPa with NS and SF. Test results indicated that the optimum NS content was 1.0% in which the flexural strength, compressive strength, and elastic modulus yielded the greatest value. Moreover, 10% SF substitution would result in an effective improvement in engineering properties of the concrete. Finally, based on obtained data, analytical models to predict elastic modulus and flexural compressive strength of concrete based on compressive strength were developed with high reliability.

Published
2020-10-03
How to Cite
Van-Bach Le, Huu-Bang Tran, Vu To-Anh Phan. (2020). Effects of Nano-Sio2 from Rice Husk Ash and Silica Fume on the Engineering Properties of Mortar and Concrete. International Journal of Advanced Science and Technology, 29(04), 9846 -. Retrieved from http://sersc.org/journals/index.php/IJAST/article/view/33011