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Polymers as microcrack stopper in concrete observed in ESEM
The well known effect of increasing strength due to increasing polymer content of PCC-materials can be explained by energy dissipation due to stretched polymer particles over microcracks in concrete or mortar, respectively. Using an Environmental Scanning Electron Microscope (ESEM) it is possible to show the microcrack bridging behaviour of polymer particles under tensile load. For these purpose a miniaturized testing device has been developed. Using the new technology of an Environmental Scanning Electron Microscope we get independent from the necessity of sample drying. We are now able to show the effects of microcrack propagation using small specimens of mortar, which are loaded inside the microscope. In a proper testing device the load is transferred through the sample as well as through four steel bypasses beside the sample. Strain is measured on the sample and on all steel bypasses. Crack propagation of the observed microcrack can be shown. Crack opening from a width of about 300 nanometer up to about 20 micron allow at least looking onto the new surfaces opened by crack propagation and seeing the particles, which are cut by the crack. Polymer action as microcrack stopper is to be seen as stretched polymer particles over the microcrack.
Polymers as microcrack stopper in concrete observed in ESEM
The well known effect of increasing strength due to increasing polymer content of PCC-materials can be explained by energy dissipation due to stretched polymer particles over microcracks in concrete or mortar, respectively. Using an Environmental Scanning Electron Microscope (ESEM) it is possible to show the microcrack bridging behaviour of polymer particles under tensile load. For these purpose a miniaturized testing device has been developed. Using the new technology of an Environmental Scanning Electron Microscope we get independent from the necessity of sample drying. We are now able to show the effects of microcrack propagation using small specimens of mortar, which are loaded inside the microscope. In a proper testing device the load is transferred through the sample as well as through four steel bypasses beside the sample. Strain is measured on the sample and on all steel bypasses. Crack propagation of the observed microcrack can be shown. Crack opening from a width of about 300 nanometer up to about 20 micron allow at least looking onto the new surfaces opened by crack propagation and seeing the particles, which are cut by the crack. Polymer action as microcrack stopper is to be seen as stretched polymer particles over the microcrack.
Polymers as microcrack stopper in concrete observed in ESEM
Schorn, H. (author) / Butler, M. (author) / Hempel, S. (author)
2004
8 Seiten, 12 Bilder, 6 Quellen
Conference paper
English
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