The Investigation into the Internal Temperature Evolution and Mechanical Performance of Early-Age Cemented Tailings Backfill Suffering Frost Damage

21 Pages Posted: 15 Jun 2022

See all articles by Yalun Zhang

Yalun Zhang

affiliation not provided to SSRN

Wenbin Xu

affiliation not provided to SSRN

Abstract

This research exhibits the tentative results of internal temperature, compressive strength, and pore structures during the service term of frost-damaged cemented tailings backfill (CTB) to study the degeneration of the service performance of early-age CTB at sub-zero temperature. The homologous tests were conducted by considering the freezing temperature, freezing duration, freezing onset time, and silica fume. The influences of these elements on the service performance of early-age CTB are discussed. The results illuminate that according to the internal temperature evolution inside early-age CTB, the freezing process of early-age CTB can be divided into three phases: cooling and ice nucleation phase, speedy ice crystallization phase, and crystallization finish phase. Compared with the compressive strength of early-age CTB without frost damage, the compressive strength of early-age CTB is severely damaged by sub-zero freezing temperature and the degeneration of compressive strength is aggravated with increasing of freezing duration and decreasing of freezing temperature. Moreover, the early-age CTB with pre-curing time at room temperature (20 ℃) improves the resistance to frost damage. In addition, the addition of silica fume has a positive effect on the compressive strength of early-age CTB specimens and can delay the freezing damage on early-age C This research exhibits the tentative results of internal temperature, compressive strength, and pore structures during the service term of frost-damaged cemented tailings backfill (CTB) to study the degeneration of the service performance of early-age CTB at sub-zero temperature. The homologous tests were conducted by considering the freezing temperature, freezing duration, freezing onset time, and silica fume. The influences of these elements on the service performance of early-age CTB are discussed. The results illuminate that according to the internal temperature evolution inside early-age CTB, the freezing process of early-age CTB can be divided into three phases: cooling and ice nucleation phase, speedy ice crystallization phase, and crystallization finish phase. Compared with the compressive strength of early-age CTB without frost damage, the compressive strength of early-age CTB is severely damaged by sub-zero freezing temperature and the degeneration of compressive strength is aggravated with increasing of freezing duration and decreasing of freezing temperature. Moreover, the early-age CTB with pre-curing time at room temperature (20 ℃) improves the resistance to frost damage. In addition, the addition of silica fume has a positive effect on the compressive strength of early-age CTB specimens and can delay the freezing damage on early-age CTB. However, the promoting effect of silica fume on the compressive strength of CTB samples decreases with the decrease of freezing temperature. The research offered a series of valuable and reliable data for the early-age CTB in antifreeze engineering project, which has momentous significance for exposing the frost damage mechanism on early-age CTB. TB. However, the promoting effect of silica fume on the compressive strength of CTB samples decreases with the decrease of freezing temperature. The research offered a series of valuable and reliable data for the early-age CTB in antifreeze engineering project, which has momentous significance for exposing the frost damage mechanism on early-age CTB.

Keywords: Cemented tailings backfill, Early age, Freezing environment, Silica fume, strength, Pore size

Suggested Citation

Zhang, Yalun and Xu, Wenbin, The Investigation into the Internal Temperature Evolution and Mechanical Performance of Early-Age Cemented Tailings Backfill Suffering Frost Damage. Available at SSRN: https://ssrn.com/abstract=4136990 or http://dx.doi.org/10.2139/ssrn.4136990

Yalun Zhang

affiliation not provided to SSRN ( email )

No Address Available

Wenbin Xu (Contact Author)

affiliation not provided to SSRN ( email )

No Address Available

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