This collection contains the proceedings from the Twelfth International Conference on Recent Advances in Concrete Technology and Sustainability Issues held in Prague, Czech Republic, in October 2012. The 34 papers include Advances in Geological CO2 Sequestration and Co-Sequestration with O2, Self-Compacting High-Performance Concretes, Dynamic Performance of Eco-Friendly Prestressed Concrete Sleeper, Parameters Influencing the Performance of Shrinkage-Compensating Concrete, and much more.