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<p>Compared with traditional cement and resin grouting materials, geopolymer grouting materials offer benefits, including environmental friendliness, rapid curing, and excellent bonding properties. Many studies have mainly focused on the effects of uniaxial compressive strength (UCS) of grouting materials on the anchorage performance of rockbolts; however, the impacts of grout expansion draw little attention. The indepth mechanism of the contributions of UCS and expansion of grouts to the anchorage performance has not been studied. Micro-expansive geopolymer is utilized as grouts. The effects of UCS and expansion of grouts with various expansion agent dosages and curing ages are investigated through laboratory tests and theoretical analysis. The results show that expansion agent dosage has a dual effect, the increase of expansion agent dosage enhances the expansion pressure of geopolymer, while the UCS initially increases, reaches the maximum at the 10% dosage, and then decreases. More critically, the study innovatively reveals the contribution law of UCS and expansion pressure to the anchorage performance of rockbolts at various curing ages. At the curing age of 3&#xa0;days, the expansion pressure is the predominant effect, and the 25% expansion agent has the optimal anchorage performance. At 7 and 28&#xa0;days, rockbolts with 10% expansion agent shows the best anchorage performance, which is mainly the increasing UCS of the geopolymer grout. The effect of UCS on anchorage performance gradually exceeds the expansion pressure as the curing age increases. It provides a theoretical basis for selecting the appropriate expansion agent dosage based on short-term or long-term loading requirements.</p>

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Impacts of Expansion and Strength of Geopolymer Grouts on the Anchorage Performance of Rockbolts

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Shuqi Ma,
  • Jiazheng Chen,
  • Zhenkun Hou,
  • Xiangchen Yao,
  • Xu Tang,
  • Chen Yang,
  • Ao Liu

摘要

Compared with traditional cement and resin grouting materials, geopolymer grouting materials offer benefits, including environmental friendliness, rapid curing, and excellent bonding properties. Many studies have mainly focused on the effects of uniaxial compressive strength (UCS) of grouting materials on the anchorage performance of rockbolts; however, the impacts of grout expansion draw little attention. The indepth mechanism of the contributions of UCS and expansion of grouts to the anchorage performance has not been studied. Micro-expansive geopolymer is utilized as grouts. The effects of UCS and expansion of grouts with various expansion agent dosages and curing ages are investigated through laboratory tests and theoretical analysis. The results show that expansion agent dosage has a dual effect, the increase of expansion agent dosage enhances the expansion pressure of geopolymer, while the UCS initially increases, reaches the maximum at the 10% dosage, and then decreases. More critically, the study innovatively reveals the contribution law of UCS and expansion pressure to the anchorage performance of rockbolts at various curing ages. At the curing age of 3 days, the expansion pressure is the predominant effect, and the 25% expansion agent has the optimal anchorage performance. At 7 and 28 days, rockbolts with 10% expansion agent shows the best anchorage performance, which is mainly the increasing UCS of the geopolymer grout. The effect of UCS on anchorage performance gradually exceeds the expansion pressure as the curing age increases. It provides a theoretical basis for selecting the appropriate expansion agent dosage based on short-term or long-term loading requirements.