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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Influence of Curing Methods on the Formation of Microcracks in High-Strength Concrete
Author(s): A. Kustermann, K.-C. Thienel, and M. Keuser
Publication: Special Publication
Appears on pages(s): 1281-1294
Keywords: curing methods; durability; microcracks; visualization
Abstract:The microstructure of concrete, especially of High Performance Concrete/High Strength Concrete (HPC/HSC), usually shows many microcracks. The aim of this research project is to investigate the reasons for microcracking in HSC, especially the influence of different curing methods. Different specimens were stored at 20 °C/65 % r.h., under water, in a 40 °C furnace and under 40 °C hot wind. Additionally, the HSC was made with and without silica fume to determine the effect on the structure and on the formation of microcracks. Compressive strength of the investigated concretes ranged from 80 - 100 MPa. The main result is, that the wet curing led to a higher number of microcracks in HSC, than the curing at 20 °C/65 % r.h. and also a higher number than the curing method in the furnace or under a hot wind. Additionally, the effects of microcracking on servicability and durability were investigated. The results showed that the number of microcracks did not influence mechanical properties like compressive strength and splitting tensile strength nor water permeability. Specimens with high number of microcracks showed in these tests also higher values of Young´s modulus.
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