M. W. ALI1*, M. J. SHAHSHUJA2, A. HABIB3 and M. N. RAHMAN4, M. A. ALAM5
1=Md Wahab Ali, Research Officer, Housing and Building Research Institute, Dhaka- 1216, Bangladesh, 2=Md. Jahid Shahshuja, Research Officer, Housing and Building Research Institute, Dhaka- 1216, Bangladesh, 3=Ahsan Habib, Senior Research Officer, Housing and Building Research Institute, Dhaka -1216, Bangladesh and 4=Md Nafizur Rahman, Principal Research Officer, Housing and Building Research Institute, Dhaka -1216, Bangladesh and 5=Md Ashraful Alam, Director General, Housing and Building Research Institute, Dhaka -1216, Bangladesh. *Corresponding author’s Email: chemistmdwahabali@gmail.com
ABSTRACT
The study was conducted at the Department of Building Material Division, Housing and Building Research Institute, Dhaka- 1216, Bangladesh during from October 2021 to April 2023 to investigate the minimum cement content required with an appropriate water-to-cement ratio (w/c) to meet given workability, strength, and durability requirements in a concrete pavement and to reduce carbon dioxide emissions, energy consumption and costs. Contaminated and unused dredged sediment may turn into national wealth if it is properly utilized. Along with a small ratio of Composite Portland cement (25%), a negligible percentage (0.5 to 1.5%) of admixture has been used during the research at Housing and Building Research Institute. Stabilization or solidification method was conducted to remove toxic and organic contaminants. Having been made the raw blocks manually and automatically, blocks were cured for 28 days to check the ultimate compressive strength, water absorption. From the perspective of cost and benefit, we have calculated that it outright cost-effective and environment gets enormous benefit. This new, effective idea and solution can certainly lessen the problem of dredging sediment disposal and produce eco-friendly construction materials.
Keywords: Dredged sand, Chemical admixture, Composite Portland cement, Compressive strength and Water absorption.