STRENGTHENING OF HYDROTHERMAL HOT-PRESSED CONCRETE WASTE BY THE ADDITION OF SLAG

This paper discusses the effect of addition of granulated blast furnac e slag on the tensile strength of solidified concrete wastes using a h ydrothermal hot-pressing method, Blast furnace slag of 0-100 mass% was added to the concrete waste and NaOH solution was used as alkali-acti vator, Hydrothermal hot-pressing tests were carried out at 250 degrees C with the water content of 10-30 mass% under the pressure of 20 MPa. The tensile strength of solidified bodies was determined by Brazilian test. It was shown that the formation of tobermorite and C-S-H compou nd improved the strength, The tensile strength reached at 13 MPa under the following conditions; slag content: 50 mass%, water content: 20 m ass%, NaOH addition: 1.75 mass%.