Output Prediction of waste concrete based on GM (1, 1)

In order to promote efficient use of waste concrete in Chongqing, the building area estimation method is employed to estimate the waste concrete output from 2012 to 2018, and the gray model is used to predict the waste concrete output from 2019 to 2023. By Matlab programming, the waste concrete output in Chongqing will reach 3181.14t in 2023, which is 1.44 times that in 2012. The results show that the gray model can accurately forecast the output of waste concrete in Chongqing in the short and medium term.