Cement is absorbing some of that CO2 back when it's curing. Some of CO2 is emitted by processing (crushing and heating), that part could be eliminated by renewable fuels, some is inherent in making cement (releasing CO2 from limestone) but most of that part is absorbed back during curing. There are also carbon-negative alternatives in works[0]. That propane from cement could be used for synthesis of other materials instead of oil (not used yet because it's not needed only because we have cheaper oil) instead of being burned.

[0] https://www.theguardian.com/environment/2008/dec/31/cement-c...