Feb 08, 2020 Then, how many yards are in a ton? Since there are 2000 pounds in a ton this is 2700.2000 1.35 tons per cubic yard and thus 15 cubic yards weighs 1.35 15 20.25 tons.. how do you calculate tons of limestone? Length in feet x May 09, 2012 Cement manufacturing is highly energy- and emissions-intensive because of the extreme heat required to produce it. Producing a ton of cement requires 4.7 million BTU of energy, equivalent to about 400 pounds of coal, and generates nearly a ton of CO 2. Given its high emissions and critical importance to society, cement is an obvious place to ... The decarbonation of limestone to give the calcium required to form silicates and aluminates in clinker releases roughly 0.53 t CO 2 per ton of clinker 8. In 2005, cement production (total cementitious sales including ordinary Portland cement (OPC) and OPC blends) had an average emission intensity of 0.89 with a range of 0.650.92 t CO 2 ...