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Utilisation of calcined Palygorskite clay in cementitious system
Palygorskite (or Attapulgite) is a fibrous clay mineral and is known for its high surface area >400m2/g and low surface charge which makes it an ideal absorbent. A source of this clay from limestone quarries in the Middle East was calcined at various temperatures with changes to its mass and crystal structure determined by TGA and XRD. The calcined Palygorskite clay reacted when calcium hydroxide and water was introduced, with the calcium hydroxide being consumed to form strength producing hydrates. Typically, 1 MPa at 24hrs and 12MPa at 90days, for mortar samples containing 30% CH & 70% PG. Further increase in CH resulted in a reduction of strength. Increasing the curing temperature by +20°C had no effect on the strength. Due to the nature of this clay, the water demand during mixing was very high (0.6 -0.7 w/b), this too contributed to the lower strength. Hydration reactions were monitored by XRD and TGA. NMR was used to indicate the type of hydrates that were formed.
Utilisation of calcined Palygorskite clay in cementitious system
Palygorskite (or Attapulgite) is a fibrous clay mineral and is known for its high surface area >400m2/g and low surface charge which makes it an ideal absorbent. A source of this clay from limestone quarries in the Middle East was calcined at various temperatures with changes to its mass and crystal structure determined by TGA and XRD. The calcined Palygorskite clay reacted when calcium hydroxide and water was introduced, with the calcium hydroxide being consumed to form strength producing hydrates. Typically, 1 MPa at 24hrs and 12MPa at 90days, for mortar samples containing 30% CH & 70% PG. Further increase in CH resulted in a reduction of strength. Increasing the curing temperature by +20°C had no effect on the strength. Due to the nature of this clay, the water demand during mixing was very high (0.6 -0.7 w/b), this too contributed to the lower strength. Hydration reactions were monitored by XRD and TGA. NMR was used to indicate the type of hydrates that were formed.
Utilisation of calcined Palygorskite clay in cementitious system
Nanukuttan, Sree (Autor:in) / Little, Jonathan (Autor:in) / Davis, Geoff (Autor:in) / Russell, Mark (Autor:in)
13.09.2022
Nanukuttan , S , Little , J , Davis , G & Russell , M 2022 , ' Utilisation of calcined Palygorskite clay in cementitious system ' , Paper presented at Cement and Concrete Science , Leeds , United Kingdom , 12/09/2022 - 13/09/2022 .
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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