减缩材料对含氟无碱速凝剂喷射混凝土体积稳定性的影响研究,Langmuir

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减缩材料对含氟无碱速凝剂喷射混凝土体积稳定性的影响研究
Langmuir ( IF 3.7 ) Pub Date : 2023-10-25 , DOI: 10.1021/acs.langmuir.3c01666
Zhenmin Wan ₁ , Tingshu He ₁ , Qing Zhao ₁

Affiliation

与普通混凝土相比，喷射混凝土表现出更大的收缩变形。氟化铝无碱促进剂（AF）因其经济性和快速凝结硬化的特点而在隧道工程中得到广泛应用。目前，对氟化铝速凝剂体积稳定性的研究还比较缺乏，也没有对氟化铝速凝剂减缩材料在喷射混凝土中的应用进行相关研究。使用氟化铝促进剂会降低喷射混凝土的早期强度，添加减缩剂（SRA）和高吸水性聚合物（SAP）也会导致混凝土早期强度的进一步降低。因此，本研究旨在研究这两种减缩材料（SRA和SAP）对喷射混凝土的和易性和力学性能的影响。本研究的主要重点是确定两种减缩材料的更好补偿效果。为了实现这一目标，该研究重点评估使用 SRA 和 SAP 与氟化铝促进剂混合的喷射混凝土的凝结时间、抗压强度和体积稳定性。此外，我们还旨在通过微观测试分析来探索这些减缩材料在喷射混凝土上的水合作用和收缩补偿机制。

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Study on the Influence of Shrinkage-Reducing Materials on the Volume Stability of Shotcrete with a Fluorine-Containing Alkali-Free Accelerator

In contrast to ordinary concrete, shotcrete exhibits greater shrinkage deformation. The utilization of an aluminum fluoride alkali-free accelerator (AF) is prevalent in tunnel engineering, attributed to its economical nature and fast setting and hardening. Currently, there is a dearth of research on the volume stability of aluminum fluoride accelerators, and no relevant studies have been conducted on the application of shrinkage-reducing materials in shotcrete using an aluminum fluoride accelerator. With the use of an aluminum fluoride accelerator, the early strength of shotcrete is reduced, and the addition of a shrinkage-reducing agent (SRA) and super-absorbent polymer (SAP) can also lead to a further reduction in the early strength of concrete. Therefore, this study aims to investigate the influence of these two shrinkage-reducing materials (SRA and SAP) on the workability and mechanical properties of shotcrete. The primary focus of this research is to determine the better compensation effect of the two shrinkage-reducing materials. To accomplish this, the study focuses on assessing the setting time, compressive strength, and volume stability of shotcrete that has been mixed with an aluminum fluoride accelerator using SRA and SAP. Additionally, we also aim to explore the hydration and shrinkage compensation mechanism of these shrinkage-reducing materials on shotcrete by conducting a microscopic test analysis.

更新日期：2023-10-25

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