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The Effect of Calcite in the Raw Clay on the Pozzolanic Activity of Calcined Illite and Smectite
The pozzolanic reactivity of four calcined natural clays (two being rich in illite and two being rich in smectite) was investigated by means of 28 days compressive strength of mortars and calcium hydroxide (CH) consumption in pastes of calcined clay and CH. The materials were characterized by XRD, XRF, BET, SEM and TG/DTG. Hydrated pastes of clay and CH were investigated by means of XRD, DTG and SEM. Besides clay minerals, two of the investigated raw clays contained 15 and 25% calcite, respectively. At optimum calcination temperature, calcined clays containing smectite and calcite, and illite and calcite in the raw clay had higher pozzolanic reactivity than clays containing smectite and illite alone. Results indicate that in clays containing high amounts of calcite, the formation of a glass phase upon calcination contributes to the pozzolanic reactivity.
The Effect of Calcite in the Raw Clay on the Pozzolanic Activity of Calcined Illite and Smectite
The pozzolanic reactivity of four calcined natural clays (two being rich in illite and two being rich in smectite) was investigated by means of 28 days compressive strength of mortars and calcium hydroxide (CH) consumption in pastes of calcined clay and CH. The materials were characterized by XRD, XRF, BET, SEM and TG/DTG. Hydrated pastes of clay and CH were investigated by means of XRD, DTG and SEM. Besides clay minerals, two of the investigated raw clays contained 15 and 25% calcite, respectively. At optimum calcination temperature, calcined clays containing smectite and calcite, and illite and calcite in the raw clay had higher pozzolanic reactivity than clays containing smectite and illite alone. Results indicate that in clays containing high amounts of calcite, the formation of a glass phase upon calcination contributes to the pozzolanic reactivity.
The Effect of Calcite in the Raw Clay on the Pozzolanic Activity of Calcined Illite and Smectite
RILEM Bookseries
Bishnoi, Shashank (editor) / Danner, Tobias (author) / Norden, Geir (author) / Justnes, Harald (author)
2020-04-14
8 pages
Article/Chapter (Book)
Electronic Resource
English
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