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Performance assessment of Alccofine with silica fume,fly ash and slag for development of high strength mortar

Frontiers of Structural and Civil Engineering 2022年第5期16卷 576-588页

作者： Shivang D.JAYSWAL Mahesh MUNGULE Civil Engineering Department Institute of InfrastructureTechnologyResearch and Management(IITRAM)Ahmedabad 380026India

Previous studies on concrete have identified silica fume(SF)as the most effective supplementary material,whereas fly ash(FA)and slag have been identified as economical materials with long term strength *** of blended cement mortar referred to as blended mortar(BM)requires similar *** present study explores the application of Alccofine(AL)as supplementary material and compares its performance with conventional materials namely SF,FA and ground granulated blast furnace slag(GGBS).The mortar specimens with binder to fine-aggregates(b/f)ratio of 1:2 are prepared at water to binder(w/b)ratios of 0.4 and *** strength values and stress-strain curve for control and BM specimens are obtained at 7,28,56,and 90 d curing *** assessment based on strength activity index,k-value method and strength estimation model confirms that AL,despite lower pozzolanic activity,contributes to strength gain,due to reduced dilution *** of stress-strain curves suggests that the effect of w/b ratio is more dominant on the elastic modulus of BM specimens than on control *** observations from the study identify enhanced strength gain,improved elastic modulus and higher energy absorption as key contributions of AL making it a potential supplementary material.

关键词： Alccofine high strength mortar efficiency factor dilution effect

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RE-USE OF SPENT CATALYST FROM OIL-CRACKING REFINERIES AS SUPPLEMENTARY CEMENTING MATERIAL

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China Particuology 2006年第2期4卷 73-76页

作者： S. K. Antiohos E. Chouliara S. Tsimas School of Chemical Engineering National Technical University of Athens 9 Heroon Polytechniou Zografou Campus GR-157 73 Athens Greece

Advanced technological achievements and the continuous growth of economy have made the disposal, recycle and reuse of industrial by-products a severe challenge. The cement industry is considered one of the key sectors in this effort in successfully （in terms of not extenuating but improving some of the properties of the final product） absorbing large quantities of solid wastes, either as aggregates or as secondary cementitious materials. This not only contributes to the creation of an energy and CO2-emission depository （as commonly used raw materials are spared）, but also simultaneously alleviates the acute environmental burden caused by the irresponsible disposal of such by-products. In this study, the possibility of reusing spent fluid catalytic-cracking catalyst （FCC） as a supplementary cementing material （SCM） was examined. A series of tests were conducted, initially aiming at characterizing the material and thereafter evaluating its pozzolanic activity and its effect on the mechanical properties of blended cements. Major findings in this investigation revealed that the use of FCC as a mineral admixture in cement is feasible, strengthening the belief that siliceous glassy residues should represent a steady supply for the construction sector.

关键词： spent catalyst supplementary cementing material reactive silica efficiency factor blended cement

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Ant Colony Optimization for Task Allocation in Multi-Agent Systems

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China Communications 2013年第3期10卷 125-132页

作者：王鲁王志良胡四泉刘磊 School of Information Engineering University of Science and Technology Beijing

Task allocation is a key issue of agent cooperation mechanism in Multi-Agent Systems. The important features of an agent system such as the latency of the network infrastructure, dynamic topology, and node heterogeneity impose new challenges on the task allocation in Multi-Agent environments. Based on the traditional parallel computing task allocation method and Ant Colony Optimization (ACO), a novel task allocation method named Collection Path Ant Colony Optimization (CPACO) is proposed to achieve global optimization and reduce processing time. The existing problems of ACO are analyzed; CPACO overcomes such problems by modifying the heuristic function and the update strategy in the Ant-Cycle Model and establishing a threedimensional path pheromone storage space. The experimental results show that CPACO consumed only 10.3% of the time taken by the Global Search Algorithm and exhibited better performance than the Forward Optimal Heuristic Algorithm.

关键词： multi-agent systems task alloca- tion ant colony optimization efficiency factor

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efficiency IMPROVEMENT OF THE MOTOR USING CYLINDER-BENDING TRAVELLING WAVE

EFFICIENCY IMPROVEMENT OF THE MOTOR USING CYLINDER-BENDING T...

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第五届国际振动工程会议

作者： Zhao Xiangdong Liu Changqing and Zhao Chunsheng Shandong University of Science and Technology Taian China 271019Research Center of Ultrasonic Motor Nanjing University of Aeronautics & Astronautics Nanjing China 210016

＜正＞ A ultrasonic motor uses two orthogonalbending vibration modes of a cylinder excited bypiezoelectric ceramics to from the elliptical motion of *** motion is used to drive the *** is a typicaltraveling wave type ultrasonic *** paper givesthe exact theoretical demonstration of the traveling wavemotion of the stator and obtains the elliptical motionlocus equation and its tangential velocity of a certainparticle on the top surface of the *** on thesetheoretical analyses,we obtain a major factor influencingthe operating efficiency of the ***,a newultrasonic motor with higher efficiency has beenredesigned using cylinder-bending travelling wave and anew structural type.

关键词： ultrasonic motor cylinder-bending traveling wave efficiency factor

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