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Phase transformations of water in hardened cement paste a low-temperature DSC investigation

✍ Scribed by R.E. Beddoe; M.J. Setzer

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 339 KB
Volume: 20
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(90)90076-a

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✦ Synopsis

Differential scanning calorimety (DSC) was used to investigate the properties of gel pore water in hardened cement paste (hop). By comparing heating and cooling thermograms using a step scanning procedure evidence was found for new phase transitions due to structured water. The new tran.~itions occur at -31 °C and -24 °C during cooling. On drying the transitions vanish near relative humidities of 70 % and 88 %, respectively. An approximately cylindrical shape was deduced for the gel pores. The sorption hysteresis was also investigated.

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