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原油流变学 1

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橡胶 1

波浪衰减 1

泥体输移 1

流变 1

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Effect of polyethylene glycol on the crystallization, rheology and foamability of poly(lactic acid) containing

《化学科学与工程前沿（英文）》 2023年 第17卷 第12期   页码 2074-2087 doi: 10.1007/s11705-023-2342-8

摘要： In this study, the rheological properties, crystallization and foaming behavior of poly(lactic acid) with polyamide 6 nanofibrils were examined with polyethylene glycol as a compatibilizer. Polyamide 6 particles were deformed into nanofibrils during drawing. For the 10% polyamide 6 case, polyethylene glycol addition reduced the polyamide 6 fibril diameter from 365.53 to 254.63 nm, owing to the smaller polyamide 6 particle size and enhanced interface adhesion. Rheological experiments revealed that the viscosity and storage modulus of the composites were increased, which was associated with the three-dimensional entangled network of polyamide 6 nanofibrils. The presence of higher aspect ratio polyamide 6 nanofibrils substantially enhanced the melt strength of the composites. The isothermal crystallization kinetics results suggested that the polyamide 6 nanofibrils and polyethylene glycol had a synergistic effect on accelerating poly(lactic acid) crystallization. With the polyethylene glycol, the crystallization half-time reduced from 103.6 to 62.2 s. Batch foaming results indicated that owing to higher cell nucleation efficiency, the existence of polyamide 6 nanofibrils led to a higher cell density and lower expansion ratio. Furthermore, the poly(lactic acid)/polyamide 6 foams exhibited a higher cell density and expansion ratio than that of the foams without polyethylene glycol.

关键词： poly(lactic acid)     foaming     microfibrillation     rheological property     crystallization    

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基于三参量流变模型的止水橡皮粘弹性研究

刘礼华,熊威,张宏志,张清江

《中国工程科学》 2007年 第9卷 第8期   页码 69-71

摘要：

给出了用三参量流变模型研究止水橡胶粘弹性的基本表达式。结合某高水头闸门 止水材料的粘弹性试验，得到了所采用橡胶材料的流变参数，并指出了其蠕变变形和应力松弛变化的规律，为工程设计提供参考依据。

关键词： 高水头闸门     橡胶     粘弹性     流变    

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Stability of three-dimensional printable foam concrete as function of surfactant characteristics

《结构与土木工程前沿（英文）》   页码 935-947 doi: 10.1007/s11709-023-0964-z

摘要： Extrudability is one of the most critical factors when designing three-dimensional printable foam concrete. The extrusion process likely affects the foam stability which necessitates the investigation into surfactant properties particularly for concrete mixes with high foam contents. Although many studies have been conducted on traditional foam concrete in this context, studies on three-dimensional printed foam concrete are scarce. To address this research gap, the effects of surfactant characteristics on the stability, extrudability, and buildability of three-dimensional printed foam concrete mixes with two design densities (1000 and 1300 kg/m3) using two different surfactants and stabilizers (synthetic-based sodium lauryl sulfate stabilized with carboxymethyl cellulose sodium salt, and natural-based hingot surfactant stabilized with xanthan gum) were investigated in this study. Fresh density tests were conducted before and after the extrusion to determine stability of the foam concrete. The results were then correlated with surfactant qualities, such as viscosity and surface tension, to understand the importance of key parameters in three-dimensional printing of foam concrete. Based on the experimental results, surfactant solu1tion with viscosity exceeding 5 mPa·s and surface tension lower than 31 mN/m was recommended to yield stable three-dimensional printable foam concrete mixes. Nevertheless, the volume of foam in the mix significantly affected the printability characteristics. Unlike traditional foam concrete, the variation in the stabilizer concentration and density of concrete were found to have insignificant effect on the fresh-state-characteristics (slump, slump flow, and static yield stress) and air void microstructure of the stable mixes.

关键词： foam concrete     3D printable concrete     stability     rheology     air void microstructure    

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Printability and hardening performance of three-dimensionally-printed geopolymer based on lunar regolith simulant for automated construction of lunar infrastructure

《结构与土木工程前沿（英文）》 doi: 10.1007/s11709-023-0003-0

摘要： Using an in situ lunar regolith as a construction material in combination with 3D printing not only reduces the weight of materials carried from the Earth but also improves the automation of lunar infrastructure construction. This study aims to improve the printability of a geopolymer based on a BH-1 lunar regolith simulant, including the extrudability, open time, and buildability, by controlling the temperature and adding admixtures. Rheological parameters were used to represent printability with different water-to-binder ratios, printing temperatures, and contents of additives. The mechanical properties of the hardening geopolymer with different filling paths and loading directions were tested. The results show that heating the printed filaments with a water-to-binder ratio of 0.32 at 80 °C can adjust the printability without adding any additive, which can reduce the construction cost of lunar infrastructure. The printability of the BH-1 geopolymer can also be improved by adding 0.3% Attagel-50 and 0.5% polypropylene fiber by mass at a temperature of 20 °C to cope with the changeable environmental conditions on the Moon. After curing under a simulated lunar environment, the 72-h flexural and compressive strengths of the geopolymer specimens reach 4.1 and 48.1 MPa, respectively, which are promising considering that the acceleration of gravity on the Moon is 1/6 of that on the Earth.

关键词： geopolymer     lunar regolith simulant     3D printing     rheology     printability    

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Investigation of effects of Cocamide Diethanolamide chemical on physical and rheological properties of bituminous binder

《结构与土木工程前沿（英文）》 2022年 第16卷 第1期   页码 99-116 doi: 10.1007/s11709-021-0799-4

摘要： In this study, bituminous binder was modified with Cocamide Diethanolamide chemical, a non-ionic surfactant, and the physical and rheological properties of modified binders were investigated. In addition, Cocamide Diethanolamide has been used for the first time to modify bituminous binder, and this situation makes the study distinctive. Bituminous binder was modified more than once with the chemical by changing modification parameters and using certain additive ratios (1%, 3%, and 5%). The effects of different modification parameters and chemical additive on modified samples were investigated with conventional bitumen tests (softening point, penetration, ductility) and Superpave tests (rotational viscometer, rolling thin film oven test, pressure aging vessel, dynamic shear rheometer, bending beam rheometer). In addition, the structural characteristics of the reference binder and modified samples were examined by X-ray diffraction, Fourier Transform Infrared Spectroscopy, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The examinations showed that Cocamide Diethanolamide softens bituminous binder and lowers processing temperatures. In addition, compared to reference binder, rutting resistances of modified bituminous binders decreased with the increase of additive ratio. However, modification with Cocamide Diethanolamide increased the resistance to fatigue cracks and thermal cracks.

关键词： Cocamide Diethanolamide     bitumen modification     rheology     Superpave tests    

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The investigation of fly ash based asphalt binders using atomic force microscope

Rajan SAHA, Kyle MALLOY, Emil BAUTISTA, Konstantin SOBOLEV

《结构与土木工程前沿（英文）》 2017年 第11卷 第4期   页码 380-387 doi: 10.1007/s11709-017-0437-3

摘要： Atomic Force Microscope (AFM) is a relatively new technique for investigation of construction materials. In this study AFM was used to investigate the interaction of asphalt binder with fly ash. Fly ash is a coal combustion byproduct of electric power utilities having pozzolanic properties and commonly used in Portland cement concrete. In this study, an investigation was made by using different types of fly ash with two types of asphalt binders such as PG 58-28 and PG 64-28. Asphalt microstructure is divided into four subgroups such as Saturates, Aromatics, Resins and Asphaltenes (SARA). These four phases can be distinguished by the atomic force microscope. The interaction of these phases affected by introducing fly-ash was investigated and correlation with rheological properties was observed.

关键词： AFM     fly ash     bee     rheology     asphalt    

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Influence of morphology on high-temperature rheological properties of bitumen modified with styrene-butadiene-styrene (SBS) copolymer

《结构与土木工程前沿（英文）》 2021年 第15卷 第3期   页码 806-819 doi: 10.1007/s11709-021-0731-y

摘要： Different microstructures of the same polymer-modified bitumen (PMB) were obtained by subjecting the bitumen modified with styrene-butadiene-styrene (SBS) copolymer to isothermal annealing at various temperatures. The effects of the morphology on the rheological properties of SBS-modified bitumen were investigated within the high-temperature range. The PMB microstructures were quantitatively evaluated using image analysis. A dynamic shear rheometer was used to measure the rheological parameters of the PMB samples and perform the multiple stress creep and recovery (MSCR) test. A quantitative basis could be established on which to discuss the relationship between the PMB morphology and rheology. The image analysis indicated that conditioning by isothermal annealing evidently led to a difference in the microstructure of the samples. Variation of the thermal history is demonstrated to be a practical way to vary the morphology of the PMB with the same raw materials and formulation. Compared with the two-phase morphology, the single-phase microstructure tended to have a narrower linear viscoelastic (LVE) region of the PMB. Within the LVE region, especially at low frequencies, the homogenous PMB can store more energy when experiencing loadings and is more elastic. Outside the LVE region, based on the MSCR test results, the homogenous morphology could assist in reaching a higher percentage of strain recovery after the creep period.

关键词： polymer     bitumen     microstructure     rheology     viscoelasticity    

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Adsorption properties of polycarboxylate ether-based superplasticizer on cement particles and their resultant dispersion

Jinyoung YOON; Byoung Il CHOI; Jae Hong KIM

《结构与土木工程前沿（英文）》 2022年 第16卷 第4期   页码 506-514 doi: 10.1007/s11709-022-0813-5

摘要： The cement dispersion performance of a polycarboxylate (PCE)-based superplasticizer is highly related to their adsorption behaviors as a function of time. This study evaluated effects of PCEs on rheological properties of cementitious materials. First, characteristics of PCEs were characterized via permeation chromatography (GPC) and Fourier-transform infrared spectrometry (FT-IR). The adsorption behavior of single and blended PCEs on cementitious composites was identified using total organic carbon analyzer (TOC). Based on the measurement of PCE adsorption, the changes of rheological properties of cementitious materials as well as the number of dispersed cement particles were characterized using a rheometer and laser spectroscopy, respectively. The experimental results support the systematic mechanism of PCE adsorption, cement dispersion, and the decrease in viscosity of cementitious materials.

关键词： adsorption     polycarboxylate     superplasticizer     rheology     dispersion    

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Rheological behavior of PMVE-MA aqueous solution with metallic cations

Xiaoping DONG, Li LI, Jun XU, Xuhong GUO

《化学科学与工程前沿（英文）》 2011年 第5卷 第1期   页码 126-130 doi: 10.1007/s11705-010-0548-z

摘要： The rheological properties of aqueous solutions of poly(methyl vinyl ether-co-maleic anhydride) (PMVE-MA) upon addition of metallic cations at different pH values were investigated. Sol-gel transition and shear-thickening phenomena at moderate shear rate were observed upon increasing the amount of metallic cations, especially for cupric cation. At certain molar ratio ( ) of added cupric cations to carboxyl groups in PMVE-MA, the system became gel-like, and the storage modulus (G′) and loss modulus (G′′) were parallel and exhibited a power-law dependence on the frequency, which is consistent with Winter’s hypothesis of determining the gel point of a crosslinking system. The shear-thickening behavior depends on , pH, metallic valence, and temperature.

关键词： poly(methyl vinyl ether-co-maleic anhydride)     shear-thickening     gel point     rheology    

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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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水波与淤泥质底床相互作用数值模拟——基于滞后回路特征的淤泥体流变模型

齐鹏,侯一筠

《中国工程科学》 2006年 第8卷 第4期   页码 39-45

摘要：

应用一个滞后回路特征的半经验的淤泥体流变模型描述表面水波作用下底床软泥层的振荡运动，建立了表面水波与淤泥质底床相互作用的垂向二维耦合模型。在数值处理上，为提高数值格式对水－泥界面附近流动的分辨力，较好地再现界面附近速度梯度大的流动特点，采用垂向对数网格处理技巧。模型验证是通过计算水波波高衰减率和底床软泥体输移速度，并与有关的实验测量数据进行比较。

关键词： 泥体输移     波浪衰减     淤泥质底床     流变模型    

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油气管道流动保障技术发展趋势

李莉,苗青,佟文强,宋飞,徐海红,梁静华

《中国工程科学》 2010年 第12卷 第2期   页码 47-51

摘要：

流动保障技术是通过综合研究影响油气管道流动安全各主要相关因素对所输介质流动特性的影响规律，进而提出保障和预防措施来实现油气管道的安全运行。对油气管道流动保障技术的历史、现状和未来趋势进行了论述，明确了所包含的原油流变学及其应用研究、油（气）管道流动改进剂研究与应用研究和多种油品顺序输送流动特性研究等三项主要研究内容，提出了这一研究领域的重点发展方向。

关键词： 管道流动保障技术     原油流变学     管道流动改进剂     顺序输送    

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基于BH-1模拟月壤的低碱高强地聚合物的制备与表征 Article

周思齐, 鲁乘鸿, 朱兴一, 李峰

《工程（英文）》 2021年 第7卷 第11期   页码 1631-1645 doi: 10.1016/j.eng.2020.10.016

摘要：

建设月球基地以支持月面科研任务和资源利用一直是各国研究人员的目标。使用月球材料进行原位资源利用制备建筑材料对于节省昂贵的太空运费具有重要意义。本文研制了一种新型模拟月壤，名为北航（BH）-1。通过X射线荧光光谱（XRF）、X射线衍射（XRD）、扫描电子显微镜（SEM）和反射光谱结果证实，BH-1 的化学矿物组成和微观结构与真实月壤非常相似。本研究还在模拟月球环境条件下合成了一种基于BH-1 模拟月壤的地聚合物，并研究了补充铝源对地聚合物强度的影响。测定了碱激发BH-1 浆体的流变性能。采用XRF、XRD、傅里叶红外光谱、SEM能谱分析和27Al 魔角旋转核磁共振分析对地聚合物进行表征。试验结果表明，BH-1 浆体的流变曲线符合Herschel-Bulkley 模型，表现为剪切变稀流体。添加铝源的BH-1 地聚合物与对照组相比，28 天抗压强度可提高100.8%。同时，产生单位强度所需的添加剂的质量降低，显著减少了从地球运输至月球用于地聚合物制备的材料质量，有望节约太空运输成本。微观实验分析表明，通过添加额外的铝源来改善BH-1 地聚合物的力学性能机理为：促进了硅氧基中铝原子基团对硅原子基团的取代作用，生成更致密的无定形凝胶结构。

关键词： 深空探测     月球基地     地聚合物     模拟月壤     流变学    

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标题 作者 时间 类型 操作

Effect of polyethylene glycol on the crystallization, rheology and foamability of poly(lactic acid) containing

期刊论文

基于三参量流变模型的止水橡皮粘弹性研究

刘礼华,熊威,张宏志,张清江

期刊论文

Stability of three-dimensional printable foam concrete as function of surfactant characteristics

期刊论文

Printability and hardening performance of three-dimensionally-printed geopolymer based on lunar regolith simulant for automated construction of lunar infrastructure

期刊论文

Investigation of effects of Cocamide Diethanolamide chemical on physical and rheological properties of bituminous binder

期刊论文

The investigation of fly ash based asphalt binders using atomic force microscope

Rajan SAHA, Kyle MALLOY, Emil BAUTISTA, Konstantin SOBOLEV

期刊论文

Influence of morphology on high-temperature rheological properties of bitumen modified with styrene-butadiene-styrene (SBS) copolymer

期刊论文

Adsorption properties of polycarboxylate ether-based superplasticizer on cement particles and their resultant dispersion

Jinyoung YOON; Byoung Il CHOI; Jae Hong KIM

期刊论文

Rheological behavior of PMVE-MA aqueous solution with metallic cations

Xiaoping DONG, Li LI, Jun XU, Xuhong GUO

期刊论文

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

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

期刊论文

水波与淤泥质底床相互作用数值模拟——基于滞后回路特征的淤泥体流变模型

齐鹏,侯一筠

期刊论文

油气管道流动保障技术发展趋势

李莉,苗青,佟文强,宋飞,徐海红,梁静华

期刊论文

基于BH-1模拟月壤的低碱高强地聚合物的制备与表征

周思齐, 鲁乘鸿, 朱兴一, 李峰

期刊论文