Study of Portland cement fracture surfaces by scanning electron microscopy techniques |
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| Authors: | Deborah Walsh M A Otooni M E Taylor Jr M J Marcinkowski |
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| Affiliation: | (1) Engineering Materials Group, and Department of Mechanical Engineering, University of Maryland, College Park, Maryland, USA |
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| Abstract: | An extensive scanning electron microscopy study was carried out with respect to the fracture surfaces of Portland cement hydrated for various times. It is shown that the two major products of hydration are calcium silicate hydrate spherulites, which consist of radiating fibres and calcium hydroxide platelets. These fibres bond with one another to hold the spherulites together. The volume between the spherulites consists of calcium hydroxide platelets. The fracture is frequently found to be across the weakly bonded basal planes of the calcium hydroxide, and is believed to limit the strength of the Portland cement. |
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