Abstract
The amount of boron waste increases year by year. There is an urgent demand to manage it in order to reduce the environmental impact. In this paper, boron waste was reused as an additive in road base material. Lime and cement were employed to stabilize the waste mixture. Mechanical performances of stabilized mixture were evaluated by experimental methods. A compaction test, an unconfined compressive test, an indirect tensile test, a modulus test, a drying shrinkage test, and a frost resistance test were carried out. Results indicated that mechanical strengths of lime-stabilized boron waste mixture (LSB) satisfy the requirements of road base when lime content is greater than 8%. LSB can only be applied in non-frozen regions as a result of its poor frost resistance. The lime–cement-stabilized mixture can be used in frozen regions when lime and cement contents are 8% and 5%, respectively. Aggregate reduces the drying shrinkage coefficient effectively. Thus, aggregate is suggested for mixture stabilization properly. This work provides a proposal for the management of boron waste.
Highlights
Boron waste is discharged in the production of borax pentahydrate, borax decahydrate, anhydrous borax, etc., and its amount increases year by year
A better curing was required in order to avoid shrinkage lateritic soil inThe
Frost resistance of stabilized material cannot be ignored in these areas
Summary
Boron waste is discharged in the production of borax pentahydrate, borax decahydrate, anhydrous borax, etc., and its amount increases year by year. In China, its reserve has reached 35 million tons, and emission still grows at a rate of 1.6 million tons per year [1]. The waste containing boron oxide will pollute the earth and water because the hazardous materials will be transmitted to groundwater resource from where it is disposed [2]. The utilization of waste is helpful for environment protection and saving costs. To this end, it has been reused as building material in several countries.
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