Frías, M.Rodríguez, O.De Rojas, M. I.SánchezNebreda, B.Vegas, I.Urreta, J.García, R.Vigil, R.2024-07-242024-07-242008Frías , M , Rodríguez , O , De Rojas , M I S , Nebreda , B , Vegas , I , Urreta , J , García , R & Vigil , R 2008 , Reuse of waste paper sludge as supplementary cementing material . in Proceedings of the 2008 Global Symposium on Recycling, Waste Treatment and Clean Technology, REWAS 2008 . Proceedings of the 2008 Global Symposium on Recycling, Waste Treatment and Clean Technology, REWAS 2008 , Minerals, Metals and Materials Society , pp. 1499-1506 , 2008 Global Symposium on Recycling, Waste Treatment and Clean Technology, REWAS 2008 , Cancun , Mexico , 12/10/08 .conference9780873397261https://hdl.handle.net/11556/1608This paper shows the possibility of reutilize paper sludge waste as supplementary cementing material for the cement manufacture. This industrial waste consists essentially of a mixture of organic matter (30%) and inorganic compound, such as calcite and clay minerals. The raw paper sludge does not present pozzolanic properties, but once calcined at 650°C during 2 hours, exhibits high pozzolanic activity, similar to silica fume at 28 days, as a consequence of the transformation of kaolinite into metakaolinite. Calcined paper sludge was used as partial Portland cement replacements of 0, 5, 10 and 20%. Enhancement in compressive strength was appreciably obtained for 10 and 20% substitution levels from 7 days on. Furthermore, calcined paper sludge slightly reduces the initial and final setting times of cement paste.8enginfo:eu-repo/semantics/restrictedAccessconference outputCementPozzolansReuseWaste paper sludgeWaste Management and Disposalhttp://www.scopus.com/inward/record.url?scp=62449197839&partnerID=8YFLogxK