BibTeX does not have the right entry for preprints. This is a hack for producing the correct reference:
@booklet{EasyChair:2822,
author = {Edward Común and Arleey Sanabria Sanabria and Luis Mosquera and Ana Torre},
title = {Application of Self-Curing Concrete Method Using Polyethylene Glycol},
howpublished = {EasyChair Preprint 2822},
year = {EasyChair, 2020}}