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Tuesday, 20 August 2019
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Raw materials & technologies, Technologies

Influence of phosphate tailings on hydration and properties of Portland cement

Thursday, 10 September 2015

A study exhibits the feasibility to utilise phosphate tailings (PTS) as filler in Portland cement.

The use of phosphate tailings as filler in Portland cement is helpful to reduce the carbon footprint. Source: A. Dreher/pixelio.de

The use of phosphate tailings as filler in Portland cement is helpful to reduce the carbon footprint. Source: A. Dreher/pixelio.de

Phosphate tailings, which mainly consist of dolomite particles, are solid wastes produced from mining and beneficiating operations of phosphate rock. The use of phosphate tailings in Portland cement as filler is helpful to reduce the carbon emission and relieve other environmental problems caused by its large accumulation.

Dissolved phosphorus extends induction period

Influences of phosphate tailings on hydration, properties of Portland cement and volume stability due to possible dedolomitisation are investigated by Chinese researchers. Phosphate tailings affect setting time, strength and drying shrinkage mainly through the dilution effect. A small part of phosphorus dissolves from the tailings during the early stage of hydration, and the dissolved phosphorus extends the induction period, reduces the main heat peak by the precipitation mechanism. The dedolomitisation of phosphate tailings takes place with the presence of alkalis but causes no significant volume expansion and strength recession.

The study is published in: Construction and Building Materials, Volume 98, 15 November 2015, Pages 593-601.

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