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Calcium Carbonate Formation in the Presence of Biopolymeric Additives

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Published on: May 14, 2019

Sand consolidation with calcium phosphate-polyelectrolyte composites.

Iosif T Hafez¹, Christakis A Paraskeva, Pavlos G Klepetsanis

¹Department of Chemical Engineering, University of Patras, GR-26504 Patras, Greece.

Journal of Colloid and Interface Science

|August 20, 2011

Summary

A novel method consolidates loose sand using calcium phosphate-polyelectrolyte precipitation. Polyallylamine hydrochloride (PAH) effectively binds sand grains, unlike other tested polyelectrolytes, for improved soil stabilization.

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Area of Science:

Materials Science
Geotechnical Engineering
Chemical Engineering

Background:

Loose sand formations pose challenges in construction and environmental applications.
Developing effective in situ consolidation methods is crucial for soil stabilization.

Purpose of the Study:

To develop and evaluate a new method for consolidating loose sand formations.
To investigate the influence of different polyelectrolytes on calcium phosphate precipitation and sand consolidation.

Main Methods:

In situ precipitation of a composite calcium phosphate-polyelectrolyte salt.
Testing three polyelectrolytes: polyacrylic acid (PAA), polyallylamine hydrochloride (PAH), and polyethylenimine (PEI).
Investigating polyelectrolyte adsorption, calcium phosphate nucleation kinetics, and mechanical properties in sand packs.

Main Results:

Polyelectrolyte type significantly affects calcium phosphate crystallization rates and sand consolidation.
Polyallylamine hydrochloride (PAH) strongly favored the consolidation process.
Polyacrylic acid (PAA) and polyethylenimine (PEI) resulted in poorly consolidated agglomerates.

Conclusions:

A novel calcium phosphate-polyelectrolyte composite offers a promising approach for sand consolidation.
PAH demonstrates superior performance in binding sand grains compared to PAA and PEI.
The method's effectiveness is dependent on the specific polyelectrolyte used, highlighting the importance of material selection.