3 ms·
Our modern concrete has not existed for "centuries"... Portland cement was invented about 150 years ago, and steel-reinforced concrete started being used just o
by jbotz 7y ago
Our modern concrete has not existed for "centuries"... Portland cement was invented about 150 years ago, and steel-reinforced concrete started being used just over 100 years ago.
- deleted 7y ago[deleted]
- frandroid 7y agoI'm talking about lime-based cement, which predates Portland cement and steel-reinforced concrete. Portland cement is a huge source of CO2 emissions.