湿喷混凝土流变模型及特性研究

IF 2.2 4区 化学 Q3 CHEMISTRY, PHYSICAL
Mingzhuang Wu, Fei Chen, Aimin Li, Nannan Wu
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引用次数: 0

摘要

随着人造砂和外加剂的广泛使用,人们发现随着剪切速率的增加,一些新拌湿喷混凝土材料的剪切速率-剪切应力曲线越来越偏离线性相关关系。由于使用宾汉模型描述混凝土会产生较大误差,因此有必要使用非线性模型来研究湿喷混凝土的流变特性。本研究使用 ICAR 流变仪测定了湿喷混凝土的扭矩-速度曲线。实验数据通过宾汉模型、赫歇尔-布克雷(H-B)模型和修正宾汉(M-B)模型进行拟合,从而确定了相关的流变参数。M-B 模型的拟合效果最佳,其次是 H-B 模型和宾汉模型。当剪切速率达到特定值时,与 H-B 模型相比,M-B 模型的线性偏离程度更高。此外,考虑到 H-B 模型包括不同尺寸参数的局限性,本研究根据 Larrard 等人(Mat Struct 31:494-498, 1998 年)的研究,改进了确定等效塑性粘度的计算方法。最终,通过范围法分析了混合参数对三种流变模型的屈服应力和塑性粘度的影响。这项研究有助于加深对湿喷混凝土流变特性的理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Study on rheological model and characteristics of wet shotcrete

Study on rheological model and characteristics of wet shotcrete

With the extensive use of manufactured sand and admixtures, it has been observed that as the shear rate increases, the shear rate–shear stress curve of some fresh wet shotcrete materials increasingly deviates from a linear correlation. It is necessary to study the rheological properties of wet shotcrete using a nonlinear model due to the large error when utilizing the Bingham model to describe the concrete. The torque-velocity curve of wet shotcrete was determined using an ICAR rheometer in this study. The experimental data was fitted using the Bingham model, Herschel-Bulkley (H-B) model, and modified Bingham (M-B) model, resulting in the determination of the associated rheological parameters. The M-B model exhibits the most optimal fitting effect, followed by the H-B model and the Bingham model. As the shear rate reaches a specific value, the M-B model consistently represents a higher degree of divergence from linearity compared to the H-B model. Furthermore, considering the limitations of the H-B model which includes varying dimension parameters, this study enhanced the calculation approach for determining the equivalent plastic viscosity based on Larrard et al.’s (Mat Struct 31:494–498, 1998) research. Ultimately, the impact of the mix parameters on the yield stress and plastic viscosity of the three rheological models was analyzed through the range approach. This study is beneficial for enhancing the comprehension of the rheological characteristics of wet shotcrete.

Graphical abstract

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来源期刊
Colloid and Polymer Science
Colloid and Polymer Science 化学-高分子科学
CiteScore
4.60
自引率
4.20%
发文量
111
审稿时长
2.2 months
期刊介绍: Colloid and Polymer Science - a leading international journal of longstanding tradition - is devoted to colloid and polymer science and its interdisciplinary interactions. As such, it responds to a demand which has lost none of its actuality as revealed in the trends of contemporary materials science.
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