The contact zone between portland cement paste and glass “aggregate” surfaces
- 31 March 1978
- journal article
- Published by Elsevier BV in Cement and Concrete Research
- Vol. 8 (2), 233-243
- https://doi.org/10.1016/0008-8846(78)90012-1
Abstract
The morphology of the contact zone developed between Portland cement paste and glass slide “aggregates” has been explored using SEM and other techniques. A duplex film of about 1 μm total thickness is rapidly deposited on the glass surface. This is a continuous film of Ca(OH)2 overlain by a parallel array of rod-shaped CSH gel particles projecting normal to the interface. The nearby cement paste exhibits high porosity, but after a few days becomes partly filled with a secondary deposit of stacked platelets of relatively pure Ca(OH)2. Cement particles near the interface hydrate in a peculiar manner. A hydration product shell is quickly formed, but the encapsulated cement particles dissolve away to leave partly or completely empty shells. This behavior occurs with various Portland cement types and presumably occurs near aggregate surfaces in concrete.Keywords
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