A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Sulphate and acid resistance of HVFA concrete incorporating nano silica
Highlights Both HVFA-65 and HVFA-80 concretes provided enhanced durability compared to a comparable Portland cement concrete. HVFA-65 concrete gave superior performance in sulphate media and HVFA-80 gave superior performance when subject to acid media. XRD, TGA and NMR analysis showed evidence of gypsum formation and reduction of Calcium Hydroxide content with time. A lower Calcium Hydroxide content in HVFA-80 compared to HVFA-65 accounts for the enhanced sulfuric acid resistance in HVFA-80 concrete.
Abstract High Volume Fly Ash (HVFA) concrete has been shown to be a viable alternative construction material to Portland cement concrete to improve sustainability and durability. In addition, nano silica been found to be a significant contributor towards increasing the early age strength and the durability properties of HVFA concrete. This study reports an investigating of the resistance of HVFA concrete with 65% and 80% replacement of cement, with nano silica and hydrated lime, exposed to acid and sulphate solutions over a 2-year period. The change in physical appearance, mass and length was monitored, together with detailed mechanical, chemical and microscopy analysis at 12 and 24 months. The results indicate that the HVFA concrete mixes provided enhanced resistance compared to Portland cement concrete. The HVFA 80% cement replacement performed better in acid media while, the HVFA concrete mix with 65% cement replacement was superior in sulphate media.
Sulphate and acid resistance of HVFA concrete incorporating nano silica
Highlights Both HVFA-65 and HVFA-80 concretes provided enhanced durability compared to a comparable Portland cement concrete. HVFA-65 concrete gave superior performance in sulphate media and HVFA-80 gave superior performance when subject to acid media. XRD, TGA and NMR analysis showed evidence of gypsum formation and reduction of Calcium Hydroxide content with time. A lower Calcium Hydroxide content in HVFA-80 compared to HVFA-65 accounts for the enhanced sulfuric acid resistance in HVFA-80 concrete.
Abstract High Volume Fly Ash (HVFA) concrete has been shown to be a viable alternative construction material to Portland cement concrete to improve sustainability and durability. In addition, nano silica been found to be a significant contributor towards increasing the early age strength and the durability properties of HVFA concrete. This study reports an investigating of the resistance of HVFA concrete with 65% and 80% replacement of cement, with nano silica and hydrated lime, exposed to acid and sulphate solutions over a 2-year period. The change in physical appearance, mass and length was monitored, together with detailed mechanical, chemical and microscopy analysis at 12 and 24 months. The results indicate that the HVFA concrete mixes provided enhanced resistance compared to Portland cement concrete. The HVFA 80% cement replacement performed better in acid media while, the HVFA concrete mix with 65% cement replacement was superior in sulphate media.
Sulphate and acid resistance of HVFA concrete incorporating nano silica
Herath, Charith (author) / Law, David W. (author) / Gunasekara, Chamila (author) / Setunge, Sujeeva (author)
2023-05-29
Article (Journal)
Electronic Resource
English
EDITORIAL: Whither HVFA concrete?
Online Contents | 2008
Effect of Silica Fume and Slag on Compressive Strength and Abrasion Resistance of HVFA Concrete
| Springer Verlag | 2014
Strength Properties of High-Volume Fly Ash (HVFA) Concrete Incorporating Steel Fibres
| British Library Conference Proceedings | 2008