A low-temperature DSC investigation of hardened cement paste subjected to chloride action
Differential scanning calorimetry (DSC) was used to investigate the freezing behaviour (−175°C to 20°C) of hardened cement paste (hcp) subjected to NaCl and CaCl 2 solutions containing up to 5.4 mol Cl/l. Thermograms were also recorded for samples dried to relative humidities (RH) between 61 % and 9...
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| Veröffentlicht in: | Cement and concrete research 1988-03, Vol.18 (2), p.249-256 |
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| creator | Beddoe, R.E. Setzer, M.J. |
| description | Differential scanning calorimetry (DSC) was used to investigate the freezing behaviour (−175°C to 20°C) of hardened cement paste (hcp) subjected to NaCl and CaCl
2 solutions containing up to 5.4 mol Cl/l. Thermograms were also recorded for samples dried to relative humidities (RH) between 61 % and 96 %. The low-temperature phase transition at −38°C exhibited the freezing behaviour of an aqueous solution in gel pores of ≈ 4 nm radius. Chloride ions strongly reduce the coupling forces between gel particles and structure the gel pore water. On desorption critical behaviour of the low-temperature transition energy was observed at 0.52 mol Cl/l which is the concentration most damaging to hcp. Above 1.3 mol Cl/l freezing of supercooled bulk water in macropores was observed at more than one temperature. |
| doi_str_mv | 10.1016/0008-8846(88)90009-9 |
| format | Article |
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| subjects | Applied sciences Buildings. Public works Cement concrete constituents Cements Exact sciences and technology Materials |
| title | A low-temperature DSC investigation of hardened cement paste subjected to chloride action |
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