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Plastic shrinkage is not usually a problem in Ordinary Concrete (OC) since there is normally enough bleeding water. Due to lack of bleeding water UHPC can crack if the surface is not protected from drying. Self-desiccation develops within the whole mass of concrete, while drying begins to develop at the surface of concrete. This can create tensile stress gradients at the surface. The curing membrane that is adequate for OC may not help because it does not prevent UHPC from self-desiccation. The objective of this test was to investigate the performance of plain concrete and Steel Fibrous Cement Based Composite (SFCBC) when they are cured in different curing conditions. Both plain and SFCBC cubes were exposed to three different curing regimes; water, standard and sealed curing. The water-cured specimens had the lowest compressive strength, while the standard cured had the highest compressive strength. lt can be concluded that UHPC should not be water cured as much as possible. lt should not be expected that the water curing might create an open system in the whole body. A partially open system can harm the balance between inner and the outer part of the concrete. This can result in pre-stressing in the body and on the fibers.
Plastic shrinkage is not usually a problem in Ordinary Concrete (OC) since there is normally enough bleeding water. Due to lack of bleeding water UHPC can crack if the surface is not protected from drying. Self-desiccation develops within the whole mass of concrete, while drying begins to develop at the surface of concrete. This can create tensile stress gradients at the surface. The curing membrane that is adequate for OC may not help because it does not prevent UHPC from self-desiccation. The objective of this test was to investigate the performance of plain concrete and Steel Fibrous Cement Based Composite (SFCBC) when they are cured in different curing conditions. Both plain and SFCBC cubes were exposed to three different curing regimes; water, standard and sealed curing. The water-cured specimens had the lowest compressive strength, while the standard cured had the highest compressive strength. lt can be concluded that UHPC should not be water cured as much as possible. lt should not be expected that the water curing might create an open system in the whole body. A partially open system can harm the balance between inner and the outer part of the concrete. This can result in pre-stressing in the body and on the fibers.
Curing tests on ultra high strength plain and steel fibrous cement based composites
Ay, Lutfi (author)
2004
7 Seiten, 4 Tabellen, 6 Quellen
Conference paper
English
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