检索结果-南通市图书馆

SHEAR CAPACITY OF REINFORCED RECYCLED AGGREGATE CONCRETE BEAMS WITHOUT WEB REINFORCEMENT

在线全文

学校读者我要写书评

暂无评论

SHEAR CAPACITY OF REINFORCED RECYCLED AGGREGATE CONCRETE BEA...

SULFATE RESISTANCE MECHANISM OF HIGH- PERFORMANCE CONCRETE CONTAINING NCI

2nd International Conference on Waste Engineering and Management

作者： Jiabin LI(1 2) Jianzhuang XIAO(2) and Jian HUANG(3) (1) Institute for Structural Concrete graz university of technology Austria (2) Department of Building Engineering Tongji university P.R China (3) Guangdong Institute of Building Science P.R China

＜正＞This paper deals with the shear capacity of reinforced recycled aggregate concrete（RAC） beam without web *** this end,related test data on this topic in the published literature were *** behaviour and failure mode of RAC beams without web reinforcements are *** influence of various factors,such as the recycled（coarse） aggregate replacement percentage,the shear span-to-depth ratio,as well as the longitudinal reinforcement ratio on the shear capacity is *** suitability of the equations used to determine the shear capacity of reinforced conventional（or natural aggregate） concrete beams in several codes,such as ACI 318,EC2 and MC2010 as well as GB50010,is evaluated through a comparison of the predicted value and the test data for RAC *** was found that the equations in existing codes are generally not conservative for RAC beams, especially for beams with large recycled aggregate *** recommendations for the design of reinforced RAC beams without web reinforcement are proposed.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Wuhan university of technology(Materials Science) 1999年第1期14卷 6-15页

作者： MA Baoguo Wuhan university of technology Wuhan university of technology China Coll. of Mat. Sci. and Engineering Wuhan University of Technology Wuhan 430070 China

It is found that the incorporation of Nitrite Corrosion Inhibitor (NCI) greatly weakens the resistance of mixtures to sulfate attack. To study the mechanism of this phenomenon, in this paper, the influence of NCI addition on the cement paste and microstructure change of high performance concrete specimens is studied by means of quantitative XRD, SEM tests. The results demonstrate that the incorporation of NCI accelerates the formation of calcium hydroxide and ettringite crystals, and weakens the pore refinement effect caused by the secondary hydration reaction of fly ash and microsilica. At the age up to one year, the relative crystal quantity in mixture containing NCI is always higher than that in control mixture. The reasons for the degradation in sulfate resistance of mixtures may be attributed to the increase and stability of the calcium hydroxide and ettringite crystals formed and the weakening of secondary hydration reaction. Based on the results, conclusion can be drawn that NCI should be used cautiously in practical engineering where high resistance to sulfate attack is required. (Author abstract) 7 Refs.

关键词： nitrite corrosion inhibitor high-performance concrete microstructure sulfate resistance

A NEW MODELING METHOD FOR MACHINE-FOUNDATION COUPLING SYSTEM AND ITS APPLICATION TO THE CONTROL OF POWER FLOW

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 1999年第2期12卷 44-50页

作者： Xiong Yeping Shandong university of technology Shandong Univ of technology China

A new concept, namely, the equivalent mobility matrix of coupling subsystem is proposed, and the corresponding threesubsystem coupling progressive approach is explored. With the new efficient approach presented, the complexity in dealing with a more complicated dynamic coupling system is greatly reduced. The new modeling method is then combined with the theory of power flow to investigate the dynamics of the overall non rigid isolation system from the viewpoint of energy. The interaction between the resilient machine of its main modes and the resonant behavior of the flexible foundation on power flow transmission is studied. Taking a machine tool mounted on a multi story working plant as an example, the dynamic characteristics of the machine foundation coupling system are analyzed, and their effects on power flow transmission are revealed under various service frequency bands. Some advisable control strategies and the design principle for machinery mounted on flexible structure are proposed.

关键词： Modeling method Power flow Resilient machine Flexible foundation Subsystem Vibration control

AN APPLICATION OF EXTENSION THEORY TO THE EVALUATION OF SLOPE STABILITY

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan university of technology(Materials Science) 1999年第4期14卷 57-62页

作者： LIU Muyu Wuhan university of technology Wuhan university of technology China Inst. of Civ. Eng. and Architecture Wuhan University of Technology Wuhan 430070 China

The slope stability is affected by multiple factors. Thecomprehensive evaluation of the slope stability is a complicateproblem. The principles of extension theory have been used in thispaper to establish the matter-element model for the evaluation ofslope stability. The quantitative evaluated results have been giventhrough the calculation of the matter-element dependent degree.

关键词： extension theory matter-element model slope stability

STUDY ON HIGH CONTENT OF BLENDS IN CEMENT

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan university of technology(Materials Science) 1999年第1期14卷 25-29页

作者： GUO Juncai Wuhan university of technology Wuhan university of technology China Editoral Dept. Journal of Wuhan University of Tech. Wuhan 430070 China

The technology of activation by adding few activators ( less than 1%) to increase the amount of blends in cement was investigated. The results show that outer activation has a remarkable effect on improving the physical properties of slag cement, flyash cement and volcanic cement. For example, the compressive strength was increased by 5-10 MPa. Morever, the application of activation is beneficial to grind-aiding, early strength and water-reducing etc. (Author abstract) 4 Refs.

关键词： blends grinding-aiding early strength water-reducing

SOLIDIFICATION PROCESSING AND FRACTURE MORPHOLOGY OF SiCp/ZL108 COMPOSITE

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 1998年第1期11卷 70-75页

作者： Zhao Yutao Jiangsu university of Science and technology Jiangsu Univ of Science and Technology Jiangsu China

The solidification processing of SiCp/ZL108 composite material developed by mechanical stirring molten matrix alloy containing flux treated SiC particles is studied. The criterion and model of particles well distributed in matrix are discussed. The bonding structure of interface between SiC particles and ZL108 matrix and the morphology of tensile fracture are analysed by using JXA-840A electron-probe. The mechanism of crack propagating is explored preliminarily.

关键词： Solidification Fracture Morphology Composite

林克明旧居修缮与活化利用,广州,广东,中国

在线全文

学校读者我要写书评

暂无评论

世界建筑 2024年第8期 64-69页

作者： Guangdong Architectural Design and Research Institute Group Co.,Ltd. Architectural Design and Research Institute of South China university of technology 广东省建筑设计研究院集团股份有限公司华南理工大学建筑设计研究院有限公司

街区断点更新林克明旧居(简称旧居)1935年由中国第一代著名建筑师林克明设计建造。旧居所在的越秀北路原为民国初年广州城墙拆除后的城基路,城外即东濠涌,前后高差达8m。林克明巧妙地利用地形组织功能与空间,并采用摩登建筑理念,使建筑... 详细信息

街区断点更新林克明旧居(简称旧居)1935年由中国第一代著名建筑师林克明设计建造。旧居所在的越秀北路原为民国初年广州城墙拆除后的城基路,城外即东濠涌,前后高差达8m。林克明巧妙地利用地形组织功能与空间,并采用摩登建筑理念,使建筑形体呈现出迷人的风采。

关键词：建筑形体建筑理念活化利用功能与空间著名建筑师林克明修缮城墙

RESEARCH ON BEHAVIORS OF ELECTRORHEOLOGICAL FLUID-BASED SEMIACTIVE ROBOT FINGERTIPS

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 1998年第2期11卷 17-22,29页

作者： Yue Hong Li Tiejun Department of Mechanical Engineering, Hebei university of technology Peng Yuqing Cai Hegao Hebei university of technology Harbin Institute of technology Hebei Univ of technology China

A new design of robot gripper with electrorheological fluid (ERF) semiactive tips is described. There are two remarkable properties using this fingertip. One is the higher lifting capability at little grasp force, which can realize stable grasp. Another is the damping controllable which can be used for controlling contact forces. A viscoelastic plastic model for normal direction of the fingertip is proposed to explore the contact behavior. The electric field strength is induced into the dynamic model of contact transition for simulations. The simulation results and conclusions are given.

关键词： Robot Semiactive fingertip Electrorheological fluid Dynamic model Simulation

Corrosion of titanium in supercritical water oxidation environments

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2002年第6期12卷 1054-1057页

作者：卢建树毛志远张九渊College of Chemical Engineering Zhejiang university of technology 马淳安College of Chemical Engineering Zhejiang university of technology 毛信表College of Chemical Engineering Zhejiang university of technology 李肖华College of Chemical Engineering Zhejiang university of technology College of Chemical Engineering Zhejiang University of Technology College of Materials and Chemical Engineering Zhejiang University

Supercritical water oxidation (SCWO) can effectively destroy many kinds of civilian and military wastes. The high temperature and high pressure SCWO operation conditions generate very corrosive environment that many engineering materials fail to withstand. Preliminary test shows that titanium may be a promising material in most of SCWO conditions. Commercially pure titanium is tested in four kinds of SCWO environments. Phenol, sodium dodecyl benzosulfonate, n amine phenol, and chlorpyrifos were chosen as typical target pollutants. The results show that titanium is only superficially attacked in the first three SCWO environments while in chlorpyrifos SCWO medium titanium is corroded. The corrosion is temperature dependent, with heavier corrosion occurring at near critical temperature. X ray diffraction analysis shows that the corrosion products consist of titanium oxy phosphates and titanium oxide, in which Ti 5O 4(PO 4) 4 is the main phase.

关键词：钛腐蚀超临界水氧化