Over at The Oil Drum
they have an interesting bar graph on cement production by country:
Remember, in China, oil isn't used in cement production. In the "clinker" stage, it's all coal. In the blending stage it's electricity (which is generated 80% from coal in China).
And cement production in China is inefficient. There are hundreds of small plants, both wet and dry processes, and the local environmental impact is severe.
Ramped up Olympic production or not, that'salada cement.