Experimental study on restrained shrinkage-induced cracking of mortars with different toughness
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In this paper, experimental results on restrained shrinkage test of cement mortars and light weight high performance fiber reinforced cementitious composites (HPFRCC) are presented. Two types of light weight hybrid HPFRCC and two types of premix mortars are included in the experiment. Results show the multiple cracks, as many as 49, in light weight hybrid HPFRCC specimens compared to a localized single crack in premix mortar-II and about six cracks in premix mortar-I specimen. The maximum crack width in the premix mortar-II and mortar-I specimens is about 1.4 mm and 0.40 mm, respectively. However, the scenario is quite different in light weight hybrid HPFRCC specimens, where the width of almost all cracks are less than 0.10 mm except only one crack the width of which is about 0.40 mm.
F. TOUTLEMONDE ed., Co-editors K. Sakai, O. E. Gjørv, N. Banthia, Concrete under Severe Conditions: Environment and Loading, Proc. of the 5th int. CONSEC conference, 2 volumes + CD-Rom (1944 pages), ISSN : 1628-4704, LCPC, Paris.Experience from the performance of existing concrete structures, and especially under severe environmental conditions, severe accidental loading or extended lifespan, has demonstrated the need for better integration of stuctural and durability design, new design concepts including reliability-based durability design, performance-based material requirements, structural robustness, and an improved basis for documentation of obtained construction quality and durability properties during concrete construction. An improved basis for operation and preventive maintenance of concrete structures, including repairs and retrofitting is also very important. The large amount of scientific and technical advances provided by the 5th international CONSEC conference (CONSEC 07) and documented in these Proceedings is a further milestone towards sustainable concrete construction. These proceedings, as well as other books published by LCPC, can be ordered using the following link (you just have to search for the title) : http://www.lcpc.fr/english/information-sources/article/callistee-lcpc-s-documentary
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