Effect of container geometry induced slippage on rheological measurement of fresh cement-based materials using coaxial cylinder rheometer

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-03-13 DOI:10.1016/j.conbuildmat.2025.140790

Zhisong Xu , Wen Sun , Shenglong Miao , Shuchen Li , Jiaping Liu

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引用次数: 0

Abstract

Rheological properties are critical for evaluating the workability of fresh cement-based materials (CBM), determined through the relationship between shear stress and shear rate. However, boundary slippage during testing can lead to errors in shear rate calculations, reducing measurement accuracy. This study aims to investigate the impact of container geometry, specifically wall type (smooth, rough, ribbed) and radius (50 mm, 40 mm, 30 mm, 20 mm), on slippage and its effect on rheological measurements. Using a coaxial cylinder rheometer, tests were conducted on fresh CBM pastes of different fluidities. Rheological curves obtained using different sample containers were compared. The results show that slippage significantly underestimates rheological parameters, such as yield stress and consistency index, particularly in smooth and smaller-radius containers. Ribbed containers effectively reduced slippage, improving measurement accuracy by up to 26.4 % for yield stress and 17.9 % for consistency index. However, ribbed walls introduced secondary flow near the boundary, which affected shear rate distribution, especially in smaller containers with large rib-to-radius ratios. Furthermore, the shear rate range was found to play a critical role in measured rheological characteristics. Higher shear rate results in more non-linear flow behavior. The study highlights the need for selecting appropriate container geometry to optimize measurement accuracy, balancing the trade-offs between slippage reduction and other potential flow disturbances.

查看原文本刊更多论文

容器几何诱导滑移对用同轴圆柱形流变仪测量新鲜水泥基材料流变学的影响

流变特性是评价新水泥基材料（CBM）可加工性的关键，它是通过剪切应力和剪切速率之间的关系来确定的。然而，测试过程中的边界滑移会导致剪切速率计算错误，降低测量精度。本研究旨在研究容器几何形状，特别是壁型（光滑、粗糙、肋形）和半径（50 mm、40 mm、30 mm、20 mm）对滑移的影响及其对流变测量的影响。采用同轴圆筒流变仪对不同流动性的新鲜煤层气膏体进行了试验。比较了不同样品容器的流变曲线。结果表明，滑移严重低估了流变参数，如屈服应力和一致性指数，特别是在光滑和小半径容器中。带肋容器有效地减少了滑移，提高了26.4 %的屈服应力测量精度和17.9 %的一致性指数。然而，肋壁在边界附近引入了二次流，影响了剪切速率分布，特别是在肋半径比较大的小型容器中。此外，发现剪切速率范围在测量的流变特性中起关键作用。更高的剪切速率会导致更多的非线性流动行为。该研究强调，需要选择合适的容器几何形状来优化测量精度，平衡减少滑移和其他潜在流动干扰之间的权衡。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.