Title:
Isothermal Calorimetry Investigation of Slag Activation
Author(s):
Qiwei C. Nowasell, Ray B. Henderson and John T. Kevern
Publication:
Symposium Paper
Volume:
320
Issue:
Appears on pages(s):
39.1-39.14
Keywords:
alkaline activation, compressive strength, hydraulic activity, heat profile, slag
DOI:
10.14359/51701077
Date:
8/1/2017
Abstract:
This paper presents results of studies on five different slag chemistry with different CaO/SiO ratios and reactivity with activators such as calcium hydroxide and portland cement. The hydration process is investigated through calorimetric data; the heat of hydration of alkaline activated slag goes through four steps was verified. The total heat generated by alkaline activation process follows logarithmic functions with time and is affected by slag chemistry and fineness. Slag blended with ASTM C150 Type I and Type II cements were studied as well. Concrete with blended slag cement compressive strength shows that Blaine plays as an important role as chemistry, possibly
due to particle packing related effect. Also high performance concrete mixes with slag blended Type II cement have 12-14% compressive strength increase compare to concrete with slag blended with Type I cement at 56 days.
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