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流动保障 1

流变仪 1

相对黏度 1

连续油 1

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Effect of asphalt thin beams mixed with three nominal maximum aggregate sizes in the bending beam rheometer

Chun-Hsing HO,María Francisca Martínez GONZÁLEZ,Cristina Pilar Martín LINARES

《结构与土木工程前沿（英文）》 2017年第11卷第1期页码 1-7 doi: 10.1007/s11709-016-0367-5

摘要： The objective of this research is to evaluate an impact of asphalt mixture beams with varying sizes of aggregate in the Bending Beam Rheometer (BBR) for testing/predicting thermal cracking properties of asphalt pavements. The BBR test has following benefits: the equipment is cheaper, it uses smaller specimens, faster conditioning, easier availability for quality control, easier to manage, etc. However some concerns have been raised: some consider that the size of the aggregate may affect the test’s results; the other concern is that such small beams cannot represent the whole properties of the asphalt pavement. To address these criticisms, imaging techniques, statistical analysis, and viscoelastic modeling are used. Asphalt thin beams prepared with three different nominal maximum aggregate size (NMAS) (12.5mm, 9.5 mm, and 4.75 mm) were tested at three different temperatures (-18°C, -24°C, and -30°C). Based on results from statistical analyses and viscoelasticity, the ratio of asphalt binders and voids and stiffness differences among the three NMAS specimens are not significant, meaning that the impact of asphalt thin beams prepared with the three NMAS on the prediction of thermal cracking is minimal and can be neglected.

关键词： bending beam rheometer thin beams thermal cracking

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New approach to determine the plastic viscosity of self-compacting concrete

M. BENAICHA,X. ROGUIEZ,O. JALBAUD,Y. BURTSCHELL,A. Hafidi ALAOUI

《结构与土木工程前沿（英文）》 2016年第10卷第2期页码 198-208 doi: 10.1007/s11709-015-0327-5

摘要： The rheology of concrete is best measured with the use of a rheometer. The slump flow test gives a good indication of the flowability of the mixture and is therefore still used extensively to judge the workability of SCC mixtures. However, this test presents some defects. The objective of this paper is to develop a new methodology for measuring the workability of a SCC. In this article, we have proposed a correlation between the plastic viscosity of concrete, the time and the characteristics of the flow final profile from the V-funnel coupled to a Plexiglas horizontal channel. The proposed approach, verified by experimental results, represents a simple, economical and usable tool on building site, and it allows to characterize rheologically the SCC from its flow. The comparison between our approach and the experimental values of the plastic viscosity shows that, in a laboratory or on site, instead of using a rheometer we can use our approach to characterize the rheological behavior of a SCC.

关键词： rheology viscosity V-funnel flow profile rheometer behavior

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天然气水合物浆液流变学研究综述 Perspective

Ahmad A.A. Majid, David T. Wu, Carolyn A. Koh

《工程（英文）》 2018年第4卷第3期页码 321-329 doi: 10.1016/j.eng.2018.05.017

摘要：

天然气水合物是固体包裹化合物，由三维的氢键网络组成，可以用来捕获气体小分子，比如甲烷和二氧化碳。了解溶液中天然气水合物晶体的流变性能对于许多能源方面的应用至关重要，包括天然气在海底和陆地上的运输，以及气体分离、脱盐或封存等方面的技术应用。人们已经对水合物浆体流变学进行了多次实验和模型模拟；然而，理论与实验之间的联系并不明确。本文讲述了对高、低压流变仪的研究以及在高压流动环境下，一系列不同的过冷度(ΔTsub = Tequil – Texp)和流体条件的水合物浆体黏度测量技术的现状（包括水和油的连续系统）。本文介绍了天然气水合物泥浆相对黏度的理论模型，还讨论了实验和理论之间的联系。

关键词：相对黏度流动保障流变仪连续油