Abstract
The X ray computed tomography (X-CT) was applied to test the cracking resistance of cement paste, and the hydration process was monitored to study the effect of fly ash on the early age cracking performance. The results showed that the hydration heat reduced with the increase of fly ash under the same water-cement ratio. Within 24h, the porosity increased with time. The addition of fly ash increased the proportion of large holes and then changed the internal stress state. Using X-CT test method and by comparing the number of cracks, the sample with 20% FA was found to have the most serious cracks, whereas the sample with 30% FA had the best crack resistance.
Publisher
Trans Tech Publications, Ltd.
Reference8 articles.
1. China Civil Engineering Society，Durability of Concrete Structures Design and Construction Guidelines, _CCES01-(2004).
2. Richard W, Burrow s, The Visible and Invisible Cracking of Concrete, 1998, 1- 5.
3. Xinghua He. Cracks in the construction and Prevention Guide. Beijing: China Building Industry Press, (2005).
4. Springen schmid R. Thermal Cracking in Concrete at Early Ages. New York: E& FN SPON, (1994).
5. Yan LIU1, 2, Zhigang LUO3 and Bo DIAO4. Study on the New Measurement Technology for Evaluating the Cracking Performance of Airport Runway Under Construction Based on Airport Pavement Operational Safety[C]. ASCE 2012, 3218-3217.