Design of performance based concrete using sand reclaimed from construction & demolition wastes

Project ID: LTAIN19205
Funding provider: Ministry of Education, Youth and Sports 
Investigator at UCEEB: prof. Ing. Petr Hájek, CSc.
Project duration: 1. 1. 2020 – 31. 12. 2022
Partner: Department of Civil Engineering Manipal University Jaipur

Construction activities are known for depletion of largest amounts of natural resources. In recent years, legislative restrictions on mining of sand has put a halt on construction activities posing great economic and occupational losses. Owing to rapid urbanization and limited land, construction and demolition waste (CDW) is increasing enormously. This growing problem of C&D waste and scarcity of sand in India and Czech Republic calls for an urgent attention and action. The Czech team has already established recycling technique for CDW. The prime objective of this project is to design performance-based concrete using sand reclaimed from construction & demolition wastes with following objectives:

The main objectives of the project are to map the demolition and recycling process in both locations and to verify the quality and properties of recycled sand, or a fine fraction of recycled aggregate from construction and demolition waste. Both the chemical and physical properties of these materials will be verified (Milestone 1). Furthermore, concrete recipes with different replacement rates of natural sand will be designed. Recycled sand from construction and demolition waste will be used as a substitute. The recipe design will take into account the properties of the aggregate. The replacement rates will be higher than the maximum possible in the previous literature and thus from 30% to 100%. The concrete mixtures will first be tested for physical and mechanical properties. Durability will then be verified on selected recipes (Milestone 2). At the end of the project, all environmental aspects related to the replacement of natural sand in concrete and mortar mixtures will be evaluated and compared (Milestone 3). Both working groups (Czech and Indian) will communicate with each other during the project, share partial results and compare them. They will exchange valuable experience in order to maximize the use of these materials in both locations. This has reduced the environmental impact associated with sand extraction and transport.