期刊：
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY,2019年19(8):4465-4473 ISSN：1533-4880
通讯作者：
Shi, Xianming
作者机构：
[Gong, Jing; Li, Zhipeng; Zhang, Rongtang] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Hubei, Peoples R China.;[Gong, Jing] Wuchang Univ Technol, Coll Urban Construct, Wuhan 430223, Hubei, Peoples R China.;[Li, Jianfen] Wuhan Polytech Univ, Sch Chem Engn & Environm, Wuhan 430023, Hubei, Peoples R China.;[Shi, Xianming] Washington State Univ, Dept Civil & Environm Engn, Lab Adv & Sustainable Cementitious Mat, Pullman, WA 99164 USA.
通讯机构：
[Shi, Xianming] W;Washington State Univ, Dept Civil & Environm Engn, Lab Adv & Sustainable Cementitious Mat, Pullman, WA 99164 USA.
关键词：
High Volume Fly Ash;Polyethylene Microfiber;Nano-Montmorillonite;Interface;EDX;Microhardness
摘要：
Foamed cement-based materials have attracted much attention as a new type of thermal insulation materials (TIMs) that may offer a sustainable solution to the built environments. This laboratory study explores the combined use of nano-montmorillonite and polyethylene microfiber in foamed paste with high volume fly ash (HVFA) binder. A total of 16 foamed HVFA paste mixtures were fabricated which consisted of 70% Class F fly ash, 30% Portland cement, 2% sodium alpha-olefin sulfonate, 0.38% Na(3)PO(4), and 2% nano-montmorillonite. The dosage and type of polyethylene microfibers (90 mum in diameter) were explored in the present study, with six dosages (0, 0.1%, 0.2%, 0.3%, 0.4%, 0.5% by volume) and three lengths (3 mm, 6 mm, and 9 mm) tested. Based on the experimental results, the highest 28-day rupture strength (1.51 MPa) was achieved with the use of 3-mm long PE microfibers at 0.4 vol.%. Synergistic utilization of nMMT and microfibers exhibited a great influence on the dry density and water absorption of the foamed paste. The SEM micrographs illustrated the multiple mechanisms by which the microfibers serve to reduce shrinkage-induced cracking of the foamed paste. Energy-dispersive X-ray spectroscopy was employed to obtain the contents of Ca, Si, Al, S and mole ratios of Ca/Si, Ca/(Si + Al), S/Ca, and Al/Si in the hardened pastes, which reveal the difference in hydration products near or away from the nMMT-pretreated polyethylene microfibers. The results of microhardness test were also used to elucidate such nano-/micro-synergistic effects, which improved the bonding between microfibers and foamed paste matrix. A mechanism was proposed to explain the role of various admixtures and the balanced performance of such inorganic TIMs.
摘要：
Graphene oxide (GO) is increasingly used in various applications, and the implications of this nano-sized material entering the natural environment are of great interest. GO is highly soluble in water, and its accumulation in soil could significantly alter the physical and mechanical properties of the soil. In this laboratory study, we mixed GO with a soil (clayey sand, SC) to systematically study the engineering properties and microstructure of the modified soil. The experimental results reveal that the physical and mechanical properties and microstructure of clayey sand can be significantly changed by the addition of a minute quantity of GO. The liquid limit and plasticity index of the soil steadily increased (up to a GO concentration of 0.08 wt%), whereas the plastic limit did not change significantly. The addition of GO (up to 0.08 wt%) into the soil generally decreased the soil's void ratio under a given hydrostatic consolidation pressure, while increasing its undrained shear strength. Such remarkable modifications of soil by minute amounts of GO can be attributed to the extremely high specific surface area of GO and its stable dispersion in water.
摘要：
Controlling the water content in soil is crucial for the load bearing capacity of soil. In the past few decades, electroosmosis has been proved to be a versatile strategy to consolidate soil in situ. However, the efficiency of this electrochemical technique needs to be further improved for practical application. This study was designed to test the hypothesis that the incorporation of nanoparticles (NPs) during electroosmosis can significantly facilitate the migration of water molecules under an external electric field and thus improve the physical properties of the treated soil. In addition, the number of anodes per cathode was explored as another method to improve the efficiency of electroosmosis in dewatering and strengthening soil. The results from the designed laboratory experiments confirmed the benefits of increasing the number of anodes or adding positively charged SiO2@Al2O3 core–shell NPs, in increasing the dewatering rate and improving the cohesion, internal friction angle, and microstructure of the treated soil (Lake Silt). The finite element method based simulation results agreed well with the experimental observations and suggested that the NPs can promote the water migration under an electric field.
关键词：
Alternating pulse electric field;Calcium chloride;Electroosmosis;Reinforcement;Scanning electron microscopy;Weak soil
摘要：
Electroosmosis has been extensively employed as an effective method for the dewatering treatment of soils and thus the reinforcement of weak soils. At the microscopic level, this treatment process is inherently complex due to in situ chemical and electrochemical reactions, migration of ions and particles, and the dependence of zeta potential of various particles on the local pH value in the soil. This complexity has hindered further understanding of mechanisms underlying the electroosmosis technology. Here, we design an external electric field in which alternating pulse wave potentials were partially used to adjust the pH value of the soil and manipulate the dynamics of in situ formed nanoparticles and their interconnectivity. The experimental results reveal that the in situ formation of Ca-rich particles, instead of water drainage, may serve as the main mechanism underlying the observed soil reinforcement when using calcium chloride as the treatment electrolyte. The interconnectivity of such particles may be the key for the shear strength improvement without significant settlement of the soil.
摘要：
<jats:sec>
<jats:title content-type="abstract-heading">Purpose</jats:title>
<jats:p> – This paper aims to report the best practices of deicer corrosion control adopted by the Washington State Department of Transportation (WSDOT) to preserve the performance, reliability and value of its highway maintenance equipment assets. </jats:p>
</jats:sec>
<jats:sec>
<jats:title content-type="abstract-heading">Design/methodology/approach</jats:title>
<jats:p> – To enable quantitative analyses, data were collected from a site visit to WSDOT, as well as from a survey of maintenance practitioners from various transportation agencies. The direct costs related to equipment corrosion aggravated by the exposure to roadway deicers were analyzed, along with the direct benefits of mitigating such corrosion, using WSDOT as a case study. In addition, the same preliminary cost benefit analysis was conducted for an “average” Department of Transportation in a northern climate. </jats:p>
</jats:sec>
<jats:sec>
<jats:title content-type="abstract-heading">Findings</jats:title>
<jats:p> – Both cases show a highly favorable benefit-to-cost ratio for enhanced investment in controlling the risk of deicer corrosion. </jats:p>
</jats:sec>
<jats:sec>
<jats:title content-type="abstract-heading">Research limitations/implications</jats:title>
<jats:p> – It has not yet been possible to confirm this compelling argument because the analysis is partly based on assumptions instead of fully based on actual data. </jats:p>
</jats:sec>
<jats:sec>
<jats:title content-type="abstract-heading">Practical implications</jats:title>
<jats:p> – This work highlights the need to collect the relevant data such that future analysis and sensitivity analysis can be substantiated with actual data on costs and benefits. It concludes with a few suggestions for implementation. </jats:p>
</jats:sec>
<jats:sec>
<jats:title content-type="abstract-heading">Originality/value</jats:title>
<jats:p> – Many components in highway maintenance equipment fleet are at the risk of metallic corrosion, which is exacerbated in service environments where roadway deicers have been applied. This work lays the foundation for future research into this important issue.</jats:p>
</jats:sec>
期刊：
International Journal of Electrochemical Science,2016年11(7):6023-6042 ISSN：1452-3981
通讯作者：
Li, Yongxin;Shi, Xianming
作者机构：
[Wang, Dongmei; Xiao, Xiaoqing; Li, Yongxin] Anhui Normal Univ, Coll Chem & Mat Sci, Wuhu 241000, Peoples R China.;[Shi, Xianming] Washington State Univ, Dept Civil & Environm Engn, POB 642910, Pullman, WA 99164 USA.;[Shi, Xianming] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Peoples R China.;[Li, Yongxin; Shi, Xianming; Jackson, Emily; Xie, Ning; Zhang, Yan; Fang, Yida] Montana State Univ, Western Transportat Inst, Bozeman, MT 59717 USA.
通讯机构：
[Li, Yongxin] A;[Shi, Xianming] W;[Li, YX; Shi, XM] M;Anhui Normal Univ, Coll Chem & Mat Sci, Wuhu 241000, Peoples R China.;Washington State Univ, Dept Civil & Environm Engn, POB 642910, Pullman, WA 99164 USA.
摘要：
Anti-Corrosion coatings are extensively applied in maintenance and vehicles used by transportation agencies, which have been used to protect a substrate by providing a barrier between the metal and its environment outside, especially in a chloride-laden environments. In order to provide adequate corrosion protection, the coatings must be uniform, well adhered, pore free and self-healing for applications where physical damage to the coating may occur. The aim of this review is to examine the state of the corrosion coatings for the protection of various metals/alloys commonly used in maintenance equipment and vehicles, and to identify cost effective, high-performance corrosion inhibitors that may contribute to the preservation of equipment assets. The focus is placed on the metallic corrosion induced or aggravated by chlorides at ambient temperature and pressure, and near neutral pH (6-8).
摘要：
This laboratory study explores the development of plastering mortar modified by feather fibers, so as to lay the groundwork for utilizing poultry feathers in thermal- insulation materials and removing them from waste streams. The laboratory testing measured the consistency value, porosity, compressive strength and thermal conductivity of various cement mortar mixes as a function of feather fiber dosage. The experimental data were used to determine the appropriate weight fraction of feather fibers in the mortars for thermal insulation. The results indicate that the incorporation of feather fibers decreased the consistency value of fresh mortar and increased the surface roughness and porosity of hardened mortar. Under the investigated conditions, as the content of admixed fiber increased, both the compressive strength and thermal conductivity of hardened mortar decreased remarkably before leveling off. The desirable dosage of feather fibers falls in the range of 0.2-0.7% by mass of dry mixture.
关键词：
anti-icing;winter road maintenance;snow and ice control;fixed automated spray technology;evaluation;antigivrage;entretien des routes en hiver;contrôle de la neige et de la glace;technologie d’arrosage automatisé fixe;évaluation
摘要：
This paper synthesizes information obtained from a comprehensive literature review and agency surveys on the state of the practice of fixed automated spray technology (FAST) systems. Experience with FAST systems in North America and Europe has revealed a mixed picture. On the one hand, several studies have indicated reductions in mobile operation costs and significant reductions in crash frequency, resulting in favorable benefit-cost ratios. On the other hand, there have been a variety of problems related to activation frequency, system maintenance and training. Installing a FAST system is complex and the challenges are often site specific. However, the evaluations cited show that FAST systems can be cost-beneficial if their locations are carefully chosen and if the system is supported with reliable environmental sensors. Finally, it was found that application of FAST systems in North America have recently increased.
作者机构：
[Xianming Shi] School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, China;Western Transportation Institute, PO Box 174250, College of Engineering, Montana State University, Bozeman, MT 59717-4250, USA;Civil Engineering Department, 205 Cobleigh Hall, Montana State University, Bozeman, MT 59717-2220, USA. E-mail:;[Lisa Ballard] Current Transportation Solutions, Inc., 10 Sweetgrass Ave, Bozeman, MT 59718, USA. E-mail:;[Shaowei Wang; Enzhen Huang] Western Transportation Institute, PO Box 174250, College of Engineering, Montana State University, Bozeman, MT 59717-4250, USA. E-mail:
会议名称：
12th COTA International Conference of Transpoetation Professionals(CICTP2012)(第十二届COTA国际交通科技年会)
会议时间：
2012-08-03
会议地点：
北京
会议论文集名称：
12th COTA International Conference of Transpoetation Professionals(CICTP2012)(第十二届COTA国际交通科技年会)论文集
摘要：
Surface transportation in the U.S. is constantly threatened by the capricious character of weather. Improving the quality and accessibility of road and weather information may benefit a wide spectrum of weather data users. This paper presents a case study known as the proof-of-concept WeatherShare, an integrated, user-friendly surface transportation weather system for northern California. The goal of WeatherShare is to streamline and integrate currently available road weather data into one single source easily accessible by incident responders and potentially the traveling public, including those from Caltrans Road Weather Information Systems (RWIS), California Data Exchange Center, National Weather Service, among other providers in the region. To guide the system design and development, a Concept of Operations (ConOps) was developed to: 1) document the existing system; 2) identify the high-level needs to be addressed; 3) provide a conceptual overview of the desired system; 4) define users and operational scenarios of the proposed system; 5) present operational impacts of the proposed system; and 6) analyze advantages of the proposed system. This work demonstrates an innovative approach to developing a regional pilot weather information system, in which a systems engineering approach was used to incorporate stakeholder input and feedback throughout the iterative development process.
