The construction of highways has been on upward trend in Kenya over the past century, especially in major towns and cities. Highways are an expensive part of transportation facilities, as their construction and maintenance require huge amounts of materials globally. The increased demand for construction materials has raised concerns about the availability of natural aggregates and source of new aggregates. Historically, the most common method of handling the waste materials has been through disposal in dedicated landfills. Concrete accounts for millions of tons of waste during construction in Kenya. According to World Bank (2012) the predictions for annual wastes from construction is expected to hit 2.2 billion tons globally by 2025. As land use policies and environmental regulations become more restrictive, there is need to seek alternative ways of handling CDW. This situation has necessitated the construction industry to begin recycling CDW as an alternative aggregate for highways works because of the environmental, economic and engineering benefits replacing natural aggregates. Addressing this challenge of how to manage concrete waste in Kenya is critical to delivering on Kenya’s constitutional right to a clean and healthy (National Sustainable Waste Management Policy, 2019). In addition to this, a significant amount of carbon oxide is emitted during cement manufacture which is a major greenhouse gas. Cement production accounts for about 8 % of the world’s carbon (IV) oxide emissions (Beyond Zero Emissions Report, 2021)

Degree Program
Project Supervisor
Engineer George Matheri
Student Name