Comparative study of fly ash and rice husk ash as cement replacement in pervious concrete: mechanical characteristics and sustainability analysis

Pervious concrete is a special type of concrete consisting of cement, coarse aggregate and water. Cement is a widely used raw material for construction including pervious concrete and had led to the release of huge amounts of CO 2 to the environment. Therefore, there is lot of research interest in f...

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Bibliographic Details
Published in:The international journal of pavement engineering 2023-01, Vol.24 (2)
Main Authors: Subramaniam, Daniel Niruban, Sathiparan, Navaratnarajah
Format: Article
Language:English
Subjects:
Agricultural wastes
Cement
Comparative studies
Compressive strength
Concrete
Emissions
Fly ash
Industrial wastes
Mechanical properties
Pervious concrete
Production costs
Raw materials
Rice
rice husk ash
Sustainability
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Summary:Pervious concrete is a special type of concrete consisting of cement, coarse aggregate and water. Cement is a widely used raw material for construction including pervious concrete and had led to the release of huge amounts of CO 2 to the environment. Therefore, there is lot of research interest in finding supplementary cementitious materials. The present study examined and compared the feasibility of using industrial waste fly ash (FA) and agricultural waste rice husk ash (RHA) for sustainable pervious concrete production. An experimental program was performed with substitution of FA and RHA contents of 5%, 10%, 15% and 20% as cement replacement and water to binder ratio of 0.3, 0.35, 0.4 and 0.45. The characteristics of pervious concrete and sustainability analysis were compared for both FA and RHA replacement with control concrete mortar. The results showed that both FA and RHA have a negative effect on permeability. The compressive strength was optimum for FA content lies between 10% and 15% replacement level and RHA content of 5% replacement level. Furthermore, the utilisation of FA and RHA decreased production cost, the total embodied energy and carbon emission, resulting in cost-effective and eco-friendly pervious concrete.
ISSN:1029-8436
1477-268X
DOI:10.1080/10298436.2022.2075867