Significant increases in compressive and flexural strength, especially in early stages
Increased Compressive Strength
KAOROCK increases strength in all stages of the curing process. It reacts with the free calcium hydroxide (lime) produced during the cement hydration process to form additional cementitious materials. See the bar chart to the right.

Both KAOROCK and silica fume showed increased strength in this laboratory test. Preliminary data on silica fume indicated a decrease at 1-day strength. As a result a new silica fume sample (SF Redo) was acquired and the test repeated.
Increased Flexural Strength
KAOROCK increases flexural strength during the curing process, especially at early stages. During testing, concrete prisms were subjected to four-point bending with a water to cement ratio of 0.4.

See the bar graph to the right showing the average peak flexural strength (modulus of rupture) versus concrete age. In looking at the results, metakaolin and silica fume reached 600 psi in one day indicating relevance to pavements. Metakaolin could be used to shorten the time needed before newly paved roads may be opened to traffic.

For a complete report on the laboratory tests completed at Georgia Tech submitted to ACI, please click this link Georgia Tech Comparison Study.

® Thiele Kaolin Company 2005 P. O. Box 1056, 520 Kaolin Road, Sandersville, GA 31082 USA

Phone: (478) 552-3951 Fax: (478) 552-4131