Partial Replacement of Fine Aggregate with Demolished Concrete Fine Aggregate and Partial Replacement of Cement with Bentonite

Akhil S Syam; Ananya Lia Joe; Anju Elizebeth Philipose; Flemy Ann Mathew

CALL FOR PAPERS : Feb-2026

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25-Feb-26

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Partial Replacement of Fine Aggregate with Demolished Concrete Fine Aggregate and Partial Replacement of Cement with Bentonite

Author(s):

Akhil S Syam , Amal Jyothi College of Engineering ; Ananya Lia Joe , Amal Jyothi College of Engineering ; Anju Elizebeth Philipose , Amal Jyothi College of Engineering ; Flemy Ann Mathew , Amal Jyothi College of Engineering

Keywords:

Construction and Demolition(CD), Concrete replaced with Demolished Concrete waste(DC), Concrete replaced with Demolished Concrete waste and Bentonite(DCB), Portland Pozzalona Cement(PPC), Mix 25(M25), Water Cement(WC)

Abstract:

In today’s world demolition of old structures to make way for new and modern ones is a common feature due to rapid urbanization. Very little demolished concrete is recycled or reused. Due to strict environmental laws and lack of dumping sites, demolished waste disposal is a great problem. On the other hand, production and utilization of concrete is rapidly increasing, which results in an increased consumption of natural aggregate, as it is the largest concrete component. More over the manufacturing process of cement has turned out to be a significant contributor to greenhouse gases, thereby, posing a serious threat to our environment. As a solution to these rising problems, we intend to propose an alternative for cement and natural aggregates. A possible solution to these problems is to reuse demolished concrete, thereby producing an alternate aggregate for structural concrete. By the replacement of cement by bentonite with all its added benefits, a concrete mix can be developed which is environment friendly. The study aims to conduct experimental investigations to assess the combined effect of partial replacement of fine aggregate by demolished waste and the effect of partial replacement of cement with bentonite on all basic properties of concrete at 7 and 28 days. The potential benefits that this solution offers is not just the conservation of natural resources and the reduction of greenhouse gases in the environment. With the addition of bentonite, various benefits such as low heat of hydration, high ultimate strength, low permeability and a greater resistance to acid attack will be observed.