Application of silica fume in high-volume fly ash self-compacting recycled aggregate concrete

ABSTRACT

Recent advancement in construction practices demands the utilisation of construction materials in a sustainable way which promotes the use of industrial by-products as Supplementary Cementitious Materials (SCMs) and alternative aggregates to protect diminishing natural resources. The present study proposed the utilisation of high-volume fly ash in the production of Self-Compacting Concrete (SCC) made with varying proportions of coarse and fine recycled aggregates. Natural Aggregates (NA) of both coarse and fine type in high-volume fly ash SCC were replaced with the respective type of recycled aggregates at the dosage of 0%, 50% and 100% by volume and their hardened state behaviour was studied in terms of compressive strength, chloride ion permeability, initial rate of water absorption, sorptivity coefficient and sulphate resistance. Results of the investigation recommends uses of Silica Fume (SF) at 10% dosages in ternary blends of cement along with high-volume fly ash for the production of SCC at 50% replacement level of both coarse and fine recycled aggregates, without compromising the hardened state properties of concrete.

KEYWORDS:

• High-volume fly ash
• silica fume
• Self-compacting concrete
• mechanical properties
• durability properties
• recycled concrete aggregates

Acknowledgments

The authors acknowledge the support of the staff of Structures Testing Laboratory at Dr. B R Ambedkar National Institute of Technology, Jalandhar, India during the experimental work reported in the paper.

Disclosure statement

The authors whose names are listed immediately below certify that they have NO affiliations with or involvement in any organization or entity with any financial interest (such as honoraria; educational grants; participation in speakers’ bureaus; membership, employment, consultancies, stock ownership, or other equity interest; and expert testimony or patent licensing arrangements), or non-financial interest (such as personal or professional relationships, affiliations, knowledge or beliefs) in the subject matter or materials discussed in this manuscript.

Additional information

Funding

The financial assistance was received in the form of fellowship to the first author from the Ministry of Education (MOE), Government of India.

Notes on contributors

Sudheer Kumar

Sudheer Kumar completed his M.tech from Dr B R Ambedkar National Institute of Technology, Jalandhar and now doing Governement job.

Kanish Kapoor

Kanish Kapoor is an Assistant Professor in Department of Civil Engineeirng at Dr B R Ambedkar National Institute of Technology, Jalandhar. His research interests are Concrete composites, Waste Utilization, Self compacting concrete.

Ran Bir Singh

Ran Bir Singh is an Assistant Professor in Central Univeristy of Haryana. His research interests are Rheology of Self compacting concrete and waster utilization in concrete.

Paramveer Singh

Paramveer Singh is a Ph.D Research Scholar in Civil Engineering department at Dr B R Ambedkar National Institute of Technology, Jalandhar.