Concrete is a comic book series created and written by Paul Chadwick and published by Dark Horse Comics. His first appearance is Dark Horse Presents #1 (July, 1986). The eponymous central character is a normal man whose brain was transplanted into a large, stone body by aliens, and who lives an extraordinary life on Earth following his escape.
The Concrete series focuses on realism. Apart from the aliens (which appear only in original series issue No. 3, in Concrete's recounting of his origin) and Concrete's own high-tech, artificial, stone body (which includes a host of attendant abilities), there are no supernatural or science-fiction elements to any stories.
The hero tries to use his body for noble endeavors, such as helping out on a family farm. Later, Concrete climbs Mount Everest, becomes involved with a group of hardline environmental militants, and reluctantly agrees to become the spokesperson of a campaign to voluntarily reduce the Earth's population.
https://en.wikipedia.org/wiki/Concrete_(comics)