Effect of Specific Surface Area of Ground Granulated Blast Furnace Slag and Its Substitution Rate on Strength Development of Concrete

Abstract

Expansion of use of mixed cement is effective as a measure to reduce CO2 emissions in the cement industry. Since ground granulated blast furnace slag can feely set the substitution rate according to the use and conditions of concrete, it can be used wider than ground granulated blast furnace slag cement and is expected. Since the initial strength development of concrete using blast furnace slag is slow, it is effective to utilize ground granulated blast furnace slag with a large specific surface area as an improvement method. In this study, we investigated the long term strength of concrete by changing the combination of the specific surface area and the substitution rate, for a wide range of ground granulated blast furnace slag with a specific surface area of 4000 to 30000 (cm 2 /g). As a result, from the conditions such as the specific surface area and the substitution rate of the ground granulated blast furnace slag, the effect of strength development of concrete using ground granulated blast furnace slag was quantitatively clarified.

Behavior of Crack Generation of Slag in Continuous Solidification Process of Blast Furnace Slag

“…Density was measured by the pycnometry in JIS Z 8807, Methods of measuring density and specific gravity of solid. The true density of the granulated slag was 2.91 g/cm 3 , which was almost identical with that of blast furnace slag fine powder in past reports, which gave values of 2.91 19,20) to 2.92 21) g/cm 3 . The measured value of the air-cooled slag was 2.94 g/cm 3 .…”

The effect of NaOH and KOH on the strength-mechanical properties of alkali-activated composites based on granulated blast-furnace slag

“…This causes increased hydration heat, which has an impact on the formation of unwanted microcracks. In addition, it can increase the possibility of an alkaline-silica reaction of the aggregate [2][3][4].…”