I'm not certain that concrete production would be the best option to just generate carbon dioxide alone. Not many production methods only produce those compounds we desire. It usually comes as a byproduct along with many other undesirable substances.

Coal Power production, for instance, gives us the much-needed energy society consumes, but generates toxic gases and lingering radioactivity we can do without.

Nuclear Power, on the other hand, gives us carbon-free energy albeit at the expense of radioactive waste we can't handle for thousands of years.

To generate the level of CO2 you feel you require would, unfortunately, draw the ire of global environmentalists. I don't know that there's anything you can do to achieve the results you desire.