| Popis: |
A recent social problem in Japan is the corrosion of concrete structures at sewerage facilities caused by sulfuric acid in the sewage, causing the structures to deteriorate before their expected life span. At the same time, low-carbon concretes using reduced amounts of cement are being developed as a response to concerns about global warming.The production of cement emits large amounts of carbon dioxide, so it is being replaced by blast furnace slag and fly ash, which are industrial by-products. In this study, low-carbon concretes with good sulfuric acid resistance are developed by replacing cement with various proportions of blast furnace slag fine powder, and fly ash. In particular, the concrete with 20% cement, 20% water-binder ratio has a high compressive strength of 60 N/mm2 or more and shows good resistance to sulfuric acid as demonstrated by a reduced mass change rate and neutralization depth in sulfuric acid immersion tests. |
