Numerical Simulation of Eco Sustainable Construction and Demolition Waste (CDW) based Geopolymer Concrete Blocks as Coarse Aggregates by using ANSYS Software

Abstract

Recycled Aggregate (RA) reduces the carbon footprint and disposal problem associated with construction and demolition debris. As India is a lower middle country, demolition of existing buildings and constructions is taking place at a rapid pace. According to the Building Materials Promotion Board, India generates 150 million tons of construction and demolition waste annually. A study commissioned by the BBMP estimated CDW generation in Bengaluru 2,500 to 3,000 tons per day in 2022, leading to the problem of CDW disposal. The biggest environmental problem is the rapid manufacture of cement for construction activities, which generates millions of tons of carbon dioxide annually, the greatest environmental concern. Coarse aggregate was made from demolished buildings and other construction debris. The construction and demolition were collected from C&D Waste Traders, sirjala Bengaluru of 10 mm size recycled aggregate using. As the crushed aggregate is porous in nature due to residual slurry, these aggregates were treated in two stages: abrasion to remove residual loose slurry, and then again by immersing the aggregate in fly ash solution of concentration 1:6. Additionally, these cured aggregates are mixed with a strong geopolymer precursor in a mix ratio of 1:4:5 to form 400X200X150 mm block. To evaluate the masonry behavior of concrete blocks the tests are conducted as per the ASTM codes. The Prism Test on Masonry was conducted as per the code ASTM C 1314 and Diagonal Tension (Shear) in Masonry Assemblages as per the code ASTM E519 and this experimental study is compared with the ANSYS Software.