The riskiness of Global Warming is increasing every years. One of the main cause of Global Warming is Carbon dioxide(CO2) which is discharged cement manufacturing. Today, Many Study is underway to using industrial by-product to reduce the amount of cement used. The most representative industrial by-product is Blast Furnace Slag(BFS). Cement matrix using BFS has advantages such as increased long term strength and reduce heat of hydration. But it has two main problems. First, cement matrix using BFS has low initial strength bacasue of exist impervious membrane on the surface of the BFS. Second, because of calcium hydroxide(Ca(OH)2) is consumed in hydration process of BFS, it has low neutralization resistance. Many study has been done to solve these problems. Among them, Study on using alkali activators is typical. Alkali activators is effective to solve the problem, but it is expensive and rist of high pH concentration to used.
Therefore, in order to supplement existing problems of BFS and alkali activator and improve the initial hydration reaction of BFS, in this study we use alkaline aqueous by electrolysis as the mixing water. and potassium carbonate was used as the electrolyte because of alkaline aqueous of about pH 12 is required to remove the surface impervious membrane of BFS. The verification experiment divide in hydration, strength and durability properties. In the Property of hydration experiment SEM, XRD, MIP were progressed, and in the property of strength experiment Flexural·Compressive strength and EIS were progressed. In the property of durability experiment neutralization acceleration test was progressed.
As a result, it was confirmed that BFS which used Alkaline aqueous by electrolysis as the mixing water improved initial hydration reactivity and initial strength. Also, it was confirmed that amount of hydrate product inside the BFS increased. it was judged that this is because of removed the membrane of BFS particles to alkaline aqueous.
Therefore, It is judged that the alkali aqueous by electrolysis is effective in improving the initial hydration reactivity through the destruction of the surface impervious membrane on the BFS.