Title

INORGANIC WASTE RECUPERATION FOR CONSTRUCTION

INORGANIC WASTE RECUPERATION FOR CONSTRUCTION

Authorship

MORENO, NICOLÁS; DAVALOS, PATRICIA; LEFTER, MARILENA GAMARRA

MORENO, NICOLÁS

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DAVALOS, PATRICIA

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LEFTER, MARILENA GAMARRA

I am this author

DOI

10.5151/2594-5327-2005-14550-0353

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Abstract

It is well known that boric acid and borates exhibits toxic effects on plants, animal and human being even at very low concentrations. The objective of this work was waste recuperation from borax industry to be used as concret agregate. B content in this residue permits mineralogical transformatin during firing the material and the formation of a vitreous fase where B is atraped as insoluble avoiding soil and ground water contamination. Results of tests on bricks manufactured from borax industry residue indicated that the residue proportion and the firing temperature were two key factors determining the brick quality. Increasing the residue content added to the bricks up to 60 % and the temperature up to 900-1000o C results in a decrease of brick shrinkage, water absoption, wight loss on ignition and the strength met the requirements of construction material. As concrete aggregate bricks particles are the inert suport wich fix the lime and cement in a solid resistent material with qualitative and quantitative caracteristics of a traditional concrete. Toxic caracteristics leaching procedure tests showed that the boron leaching level from bricks and from agregate- concrete is low. The overall results indicated a prospect for using the borax residue as a raw material in mixture with clay for the production of bricks. The use of bricks as concrete aggregate could be the Solidification and Stabilization tecnic of an hazardous waste.

It is well known that boric acid and borates exhibits toxic effects on plants, animal and human being even at very low concentrations. The objective of this work was waste recuperation from borax industry to be used as concret agregate. B content in this residue permits mineralogical transformatin during firing the material and the formation of a vitreous fase where B is atraped as insoluble avoiding soil and ground water contamination. Results of tests on bricks manufactured from borax industry residue indicated that the residue proportion and the firing temperature were two key factors determining the brick quality. Increasing the residue content added to the bricks up to 60 % and the temperature up to 900-1000o C results in a decrease of brick shrinkage, water absoption, wight loss on ignition and the strength met the requirements of construction material. As concrete aggregate bricks particles are the inert suport wich fix the lime and cement in a solid resistent material with qualitative and quantitative caracteristics of a traditional concrete. Toxic caracteristics leaching procedure tests showed that the boron leaching level from bricks and from agregate- concrete is low. The overall results indicated a prospect for using the borax residue as a raw material in mixture with clay for the production of bricks. The use of bricks as concrete aggregate could be the Solidification and Stabilization tecnic of an hazardous waste.

Keywords

Borax; Waste; Agrégate; Concrete.

Borax; Waste; Agrégate; Concrete.