Discussion: Freshness of cement: Conditions for syngenite CaK2(SO4)2 · H2O formation

S. Smillie; E. Moulin; D. E. Macphee; F. P. Glasser; J Bensted

doi:10.1680/adcr.1993.5.19.93

Discussion: Freshness of cement: Conditions for syngenite CaK₂(SO₄)₂ · H₂O formation

S. Smillie, E. Moulin, D. E. Macphee, F. P. Glasser, J Bensted

Research output: Contribution to journal › Comment/debate › peer-review

8 Citations (Scopus)

Abstract

Laboratory experiments disclose that syngenite CaK₂(S0₄)2·H₂0 forms rapidly from mixtures of gypsum and K₂SO₄ only at high relative humidities, ≥ 96% at 30°C. The concept of a critical humidity below which reaction essentially ceases is developed. The implications of syngenite formation for the freshness of stored cement are discussed: when syngenite is formed from gypsum, water is liberated which may cause prehydration of the cement phases.

Original language	English
Pages (from-to)	93-96
Number of pages	4
Journal	Advances in Cement Research
Volume	5
Issue number	19
DOIs	https://doi.org/10.1680/adcr.1993.5.19.93
Publication status	Published - 1 Jul 1993

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abstract = "Laboratory experiments disclose that syngenite CaK2(S04)2·H20 forms rapidly from mixtures of gypsum and K2SO4 only at high relative humidities, ≥ 96% at 30°C. The concept of a critical humidity below which reaction essentially ceases is developed. The implications of syngenite formation for the freshness of stored cement are discussed: when syngenite is formed from gypsum, water is liberated which may cause prehydration of the cement phases.",

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AU - Bensted, J

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AB - Laboratory experiments disclose that syngenite CaK2(S04)2·H20 forms rapidly from mixtures of gypsum and K2SO4 only at high relative humidities, ≥ 96% at 30°C. The concept of a critical humidity below which reaction essentially ceases is developed. The implications of syngenite formation for the freshness of stored cement are discussed: when syngenite is formed from gypsum, water is liberated which may cause prehydration of the cement phases.

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Discussion: Freshness of cement: Conditions for syngenite CaK₂(SO₄)₂ · H₂O formation

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