The spreading awareness of green issues in recent years has prompted us to develop environmentally friendly concrete: ultra high strength concrete that contains high volume of by-products. Compressive strength tests were conducted using mortar and concrete specimens containing various by-products. As a result, we suggested a computation approach of the compressive strength of mortar by using a regression expression that uses the chemical composition and the mixing condition of the by-product as parameters. And CO2 emissions from the component materials of this environmentally friendly, ultra high strength concrete reduce 40% of the emissions for conventional ultra high strength concrete.