PERFORMANCE EVALUATION OF MORTAR MIXED WITH FLY ASH
- BLAST FURNANCE SLAG AND ESTIMATE OF ITS
36th Our World in Concrete and Structures (OWICs) - 2011
Masayuki Watanabe* and Shinichi Miyazato
Green materials, Fly ash, Blast furnace slag, Flowability, Strength, Permeability,
In recent years, industrial by-products are widely used in terms of the environment.
In Japan, blast furnace slag is used as CEM 3 cement. However, the
demand of fly ash is little. Here in, there are three coal thermal electric plants in our
Kanazawa area. It can be thought that it is better to use local fly ash for local constructions.
From the above backgrounds, mortar specimens were made with the different
replacing ratio of fly ash and blast furnace slag. Then, the flowability, the strength
and the permabilities (chloride ions penetration depth and carbonation depth) were
evaluated. The replacing ratios of fly ash for cement were 0%, 10%, 20% and 30%.
The replacing ratios of blast furnace slag for cement were 0%, 15% and 30%. There
were total of 12 cases. Water-binder ratios were 35% and 50%. In addition, based
on our University location where is in Kanazawa area, the transport route and the
process of cement, fly ash and blast furnace slag were estimated as CO2 emissions.
As a result of this study, (1) in the case of water-binder ratio of 35% and fly ash
replacing ratio of 10%, compared with no mixing, the performance was better; (2) it
was possible to reduce most CO2 by mixing with fly ash and blast-furnace slag.