Internal stress within hardened cement paste induced through thermal mismatch: Calcium hydroxide versus calcium silicate hydrate

Internal stress within hardened cement paste induced through thermal mismatch: Calcium hydroxide versus calcium silicate hydrate

Neutron diffraction experiments have established that internal strain develops within the calcium hydroxide (CH) phase of hardened Portland cement paste when the material is cooled. The effect is attributed to thermal mismatch between CH and calcium silicate hydrate (C-S-H). It leads to internal str...

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Veröffentlicht in:Cement and concrete research 2001-12, Vol.31 (12), p.1785-1791
Hauptverfasser: Schulson, Erland M., Swainson, Ian P., Holden, Thomas M.
Format: Artikel
Sprache:eng
Schlagworte:
Analysis of cement phases and constituents
Applied sciences
Buildings. Public works
Calcium hydroxide
Cement concrete constituents
Cements
Exact sciences and technology
Materials
Neutron diffraction
Properties and test methods
Properties of anhydrous and hydrated cement, test methods
Thermal expansion
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Zusammenfassung:Neutron diffraction experiments have established that internal strain develops within the calcium hydroxide (CH) phase of hardened Portland cement paste when the material is cooled. The effect is attributed to thermal mismatch between CH and calcium silicate hydrate (C-S-H). It leads to internal stresses that are estimated to reach maximum values at 80 K of around 30±20 MPa along the crystallographic c direction and around −40±20 MPa along the a direction.
ISSN:0008-8846
1873-3948
DOI:10.1016/S0008-8846(01)00554-3