Modified phosphogypsum highway subgrade filler and preparation method thereof

Abstract

The invention discloses a modified phosphogypsum highway subgrade filler and a preparation method thereof. The method comprises the following steps: aging phosphogypsum for more than 5 days to obtain a material A; calcining the material A at 160-200 DEG C for 1.5-2.5 hours to obtain a material B, and naturally cooling the material B; uniformly mixing 91-93 wt% of the material A and 7-9 wt% of the material B to obtain a material C; and adding water, which accounts for 12-16 wt% of the material C, into the material C, and stirring uniformly to obtain the modified phosphogypsum highway subgrade filler. The phosphogypsum is calcined at controlled temperature for controlled time according to the chemical characteristics of the calcined phosphogypsum to obtain the modifier, thereby enhancing the gelation property in the phosphogypsum, improving the stability and water resistance of the internal structure and obtaining the subgrade filler satisfying the highway engineering requirements. The modified phosphogypsum highway subgrade filler effectively solves the problem that the existing phosphogypsum is restricted to the local doping materials and is low in consumption.

Description

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AI Technical Summary

Benefits of technology

This patented solution improves calcium sulfate hydration (CSH) efficiency during construction processes such as filling roads or creating new structures made from CSH filled concrete slabs. By adding excess quantities of gypsum into these compositions instead of just mixing it together at once, stronger cement blocks may also be formed without requiring expensive reinforcement measures like steel bars. Overall, this technology allows for efficient use of resources while reducing environmental concerns associated with traditional methods.

Problems solved by technology

This patented technical problem addressed in this patent relates to improving the performance of various types of hydraulically driven compositions used during drilling operations (such as concrete) without causing negative effects like increased costs due to excessive usage of landfills that have been discarded after their useful life has passed through them.

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