2014 Volume 79 Issue 706 Pages 1717-1727
Applying blast-furnace slag fine powder blended cement is an important option to achieve low carbon emission due to concrete materials in construction, and concrete structure with this blended cement concrete (BFS concrete, hereafter) is in great demand. However, BFS concrete is revealed that cracking resistance decreases at high temperature. Scope of this study is to experimentally investigate the mechanism of these phenomena. Restrained cracking experiments were conducted in three levels of ambient temperatures, 10-30 ℃, which consist of restraint cracking test, shrinkage test with non-restrained, mechanical property tests, and compressive creep test. The experiments showed that shrinkage cracking resistance of BFS concrete diminished at 30 degrees much worse than normal concrete. We found three sources for the diminishing trends: i) strength increase retention at relatively early age, which appears due to lack of hydration water, ii) autogeneous shrinkage increase at high temperature, iii) and low creep.
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