Nano-silica (SiO2) contribution to mechanical and microstructural characteristics of high performance concrete pavement
Joint Authors
al-Khafaji, Fatimah Fahim
Ahmad, Nahlah Yasub
Source
Journal of Engineering and Sustainable Development
Issue
Vol. 24, Issue 4 (31 Jul. 2020), pp.71-78, 8 p.
Publisher
al-Mustansyriah University College of Engineering
Publication Date
2020-07-31
Country of Publication
Iraq
No. of Pages
8
Main Subjects
Topics
- Building materials
- Concrete
- Electron microscopes
- Mechanical properties
- Silica
- Nanomaterials
- Scanning electron microscopes
- X-ray spectroscopy
- Compression testing
- Flexural strength
Abstract EN
High performance concrete pavement appears to be the best choice for layer with high strength and low cost.
In this paper, the mechanical properties were investigated which considered essential for design and requirements of rigid highway pavement.
These properties were examined by compressive strength, flexural strength and modulus of elasticity.
Previous test investigations were imposed for concrete mixes with different Nano SiO2 (size of 30 nm) percentage (0, 0.5, 1, 1.5, & 2) % by wright of cement as mineral admixture.
Also, X- Ray Diffraction (XRD) and X-Ray Fluorescence (XRF) tests were conducted to indicate the chemical composition of the used admixture.
Energy Dispersive Spectroscopy (EDS) was conducted to visualize the micro structural behaviour of concrete during hydration process.
Wet and dry mixing methods were utilised to prepare the modified concrete mixes and the results of the more effective method, were adopted.
Scanning electron microscopy (SEM) was utilized to investigate the microstructure and morphology of nano concrete mixes.
The results of SEM indicated that the microstructural distribution of C-S-H gel were comparable for all the nano mixes.
The decrease in thickness of nano concrete layer was associated with the increment in the percentage of nano silica add to the mixes when the other factors remain the same.
The best percentage of nano silica was 1.5% by weight of cementitious materials (by using dry mixing method).
This percentage satisfied all requirements of fresh and hardened concrete mixes for highway pavement and achieved well microstructure with significant decrement in the thickness of concrete layer which positively reflected on construction cost.
High performance concrete pavement appears to be the best choice for layer with high strength and low cost.
In this paper, the mechanical properties were investigated which considered essential for design and requirements of rigid highway pavement.
These properties were examined by compressive strength, flexural strength and modulus of elasticity.
Previous test investigations were imposed for concrete mixes with different Nano SiO2 (size of 30 nm) percentage (0, 0.5, 1, 1.5, & 2) % by wright of cement as mineral admixture.
Also, X- Ray Diffraction (XRD) and X-Ray Fluorescence (XRF) tests were conducted to indicate the chemical composition of the used admixture.
Energy Dispersive Spectroscopy (EDS) was conducted to visualize the micro structural behaviour of concrete during hydration process.
Wet and dry mixing methods were utilised to prepare the modified concrete mixes and the results of the more effective method, were adopted.
Scanning electron microscopy (SEM) was utilized to investigate the microstructure and morphology of nano concrete mixes.
The results of SEM indicated that the microstructural distribution of C-S-H gel were comparable for all the nano mixes.
The decrease in thickness of nano concrete layer was associated with the increment in the percentage of nano silica add to the mixes when the other factors remain the same.
The best percentage of nano silica was 1.5% by weight of cementitious materials (by using dry mixing method).
This percentage satisfied all requirements of fresh and hardened concrete mixes for highway pavement and achieved well microstructure with significant decrement in the thickness of concrete layer which positively reflected on construction cost.
American Psychological Association (APA)
Ahmad, Nahlah Yasub& al-Khafaji, Fatimah Fahim. 2020. Nano-silica (SiO2) contribution to mechanical and microstructural characteristics of high performance concrete pavement. Journal of Engineering and Sustainable Development،Vol. 24, no. 4, pp.71-78.
https://search.emarefa.net/detail/BIM-1263668
Modern Language Association (MLA)
Ahmad, Nahlah Yasub& al-Khafaji, Fatimah Fahim. Nano-silica (SiO2) contribution to mechanical and microstructural characteristics of high performance concrete pavement. Journal of Engineering and Sustainable Development Vol. 24, no. 4 (Jul. 2020), pp.71-78.
https://search.emarefa.net/detail/BIM-1263668
American Medical Association (AMA)
Ahmad, Nahlah Yasub& al-Khafaji, Fatimah Fahim. Nano-silica (SiO2) contribution to mechanical and microstructural characteristics of high performance concrete pavement. Journal of Engineering and Sustainable Development. 2020. Vol. 24, no. 4, pp.71-78.
https://search.emarefa.net/detail/BIM-1263668
Data Type
Journal Articles
Language
English
Notes
-
Record ID
BIM-1263668