A STUDY ON HYDRATE AND CARBONATE RESISTANCE OF CONCRETE WITH GANGUE CEMENT

This paper studies the hydrates and the characteristicsof micro-structure of concrete with gangue cement before and after carbonation under different curing conditions.It is compared with Portlandcement concrete,and the carbonate resistance of concrete with ganguecement is studied too.     

A STUDY ON THE STEEL PROTECTION PROPERTY OF GANGUE CONCRETE

In this paper,the effects of quality of gangue amount ofCaO added and w/c ratio upon the weight loss rate and potential of steelas well as pH value and structure of concrete cover of gangue concreteare analysed by means of mercury intrusion porosimetry,scanning electronmicroscopy,pH value measurement and soak-dry cycling.The results ofthis study confirm that the gangue concrete with appropriate proportiongives a good protection for steel.     

RESEARCH ON THE HYDRATION HARDENING OF THE GYPSUM FLUIDIZED FURNACE SLAG CEMENT

The hydration and hardening of the gypsum fluidized furnace slag cement is analysed by XRD and mercury pressure porosous meter combining with macroscopic experimental results. The additive, curing system affect material properties and why the water-tolerance is improved.     

STUDY ON THE LOW TEMPERATURE CALCINATION AND THE BEHAVIOUR OF STEEL SLAG COLOUR CLINKER CEMENT

The colourcd clinker cement which fired directly from kiln has the advantages of low cost,bright colour and good colour durability.This paper studies the possibility of using calcium flouridc and gypsum combined mineralizer to calcine the col-outed clindcr cement at low temperature.Different methods such as X-ray diffraction ana ysis,scanning electron microscopy,infrared spectra analysis,combined water content chemical asysis,compressive strength test and so on arc used to study the clinder minerals,the colour,the physical and mechanics properties and behaviour of the coloured clinker cement which made both with high quality raw materials and with electric furnace reduced slag additive.     

EFFECT OF CALCINED SHALE ON TNE PORE STRUCTURE OF CEMENT PASTE

By means of the test the pore strticture of cement pastes incorporating calcinedshale,the results show the effect of calcined shale on the pore sturcture of cement pastes.and the ef-fect of calcined shale on the strength of cement pastes with the changing of pore structure. The workprovides an experimental and theoretical basis for the usage of pozzolanic admixture.     

小麦温光发育模型的研究

1981～1984年,选用代表不同生态类型的25个小麦品种,在大田进行分期播种.通过分析温光等主要生态因子与小麦生长发育的关系,建立了各品种主要发育阶段的温光模型:播种至出苗为G=104.4751/(T-1.1032),出苗至二棱、出苗至拔节为V=a+bG+cP_(t1),二棱至抽穗、拔节至抽穗为V=a+bT+cL.文中认为,播种至出苗的日数(G)既能反映当时的温度条件,又可表示萌发时的“田间春化效应”;温光积(Ptl)则给“温度与光照之间存在明显的互补作用”找到了量的表达基础;因此,建模时采用这两个变量,是很有意义的.     

A STUDY ON REINFORCED BEAMS OF HIGH STRENGTH ALKALI-SLAG CONCRETE

In This paper,the characteristics and mechanical prop-erties of high strength and super-high strength concrete(60-120MPa)based on slags and alkaline components are presented.This type ofconcrete can be produced as rapid hardening or super rapid hardeningwith high durability,energy saving and low cost.Based on experimentswith reinforced beams of this type of concrete,its deformation properties,process and characteristics of disruption are described.     

THE ORGANIZED DEVELOPMENT TREND OF CEMENT CONCRETE

Cement concrete is the building material which is widely and lar-gely used.Congenital deficiency of cement concrete is brittleness.Adding a little polymer into cement concrete can improve its brittleness and function and even provide concrete with new function.This is an organized development trend of cement concrete.     

THE X-RAY DIFRACTION ANALYSIS FOR COLOURED CEMENT AND ITS HYDRATE MINERAL

This paper studies the nineral composition,mineral phase transformation mech-anism and properties of hydration and hardening of the coloured cement by using x-ray diffractionanalysis and the x-ray diffraction analysis reliability is checked by using scanning electron mi-croscopy and infrared spectral analysis and other physical and chemical analysis methods.     

A THEORETICAL BASIS OF EQUATION OF CORRELATION BETWEEN STRENGTH AND ELASTIC MODULUS OF CONCRETE

The equation of correlation between compressive strength and elastic modulus of concrete is derived on the basis of modified Burger's model. The result shows that the derived equation is similar to the empirical equation of correlation between compressive strength and elastic moulus of concrete. So this empirical equation is confirmed by rheology theory of concrete.     

THE EVALUATION OF SHEAR STRENGTH TAKING ACCOUNT OF SPAN-TO-HEIGHT RATIO OF SIMPLE BEAMS UNDER UNIFORM LOADS

By introducing the span-to-height ratio,this paper deduces wo evaluating equations of shear strength of simple reinforced concrete beamwith stirrups and under uniform loads.This makes the shear stressing concept consistent with the evaluating equations,thus improves the evaluating equationsof shear strength of the New Code.Two equations are provided with auto-regulating function on shear strength for a cross section of beam.They aresimple and convenient in evaluation.The working time used for design is not increased and 10% of stirrups is economized in frequent conditions of span-to-height ratio.     

新型高效低毒药剂粮仓杀虫灵的开发与应用研究

以两种菊酯类杀虫剂为主要成分开发研制出新型高效低毒药剂粮仓杀虫灵并用于实仓试验。试验结果表明，新药具有高效、低毒、低残留、击倒快、效果好、残效期长、价格便宜等优点，不仅完全适合空仓消毒，而且可望替代防虫磷等用作实仓防护剂。     

THE INVESTIGATION AND DEVELOPMENT OF CONTROLLED TEMPERATURE SYSTEM WITH MICROCOMPUTER

This paper introduces a controlled temperature system in which the silicon controlled rectifier is controlled by a TP-801 microcomputer. A common-used PID expression is usually applied to control temperature, but it is necessary to adjust three parameters, making the operation quite inconvenient. This system adopts the measurement of a simplified expanded-critical proportion, only one parameter is necessarily adjusted. In addition, the method of digital triggering is applied so that the D/A transfer and silicon adjuster are omitted, thus decreasing the cost and increasing the reliability of operation. This system has higher precision of control and better degree of linearity of temperature increment or decrement.     

THE "EXPERIMENTAL STUDY OF THE RELATION BETWEEN THE MAGROMOLECIJLAR STRUCTURE OF COAL AND ITS RANK

In this paper, by Using Traube's Law, we presented a method with which the macromolecular structure of coal can be studied through the relation between the true density of coal and its chemical constitution Then we researched the law of the variation of the macromolecular struclure of coal with its. rank. At the same time, we discuss the rank of coal which is classified in the constitution and macromolecular structure of coal     

THE RELATIONS BETWEEN THE HYDRATES AND PROPERTIES OF LIME-SAND MATERIALS

This paper summarized the previous research results of the physical-mechanical properties of the hydrated calcium silicate crystals and the relations between the hydrates and mechanical properties and durability of lime-sand materials. The key topicals of the relations between the hydrates and properties of lime-sand materials are discussed.     

小麦与偃麦草远缘杂交的研究

本文是作者从事小麦与偃麦草远缘杂交三十余年的研究总结.介绍了亲本选配原则、花期调节、交配方法等远缘杂交技术,用回交与重复授粉、筛选结实率高的组合与单株、延长生育期等方法克服远缘杂种F_1的不育性.介绍了小偃麦远缘杂种的培育和选择的方法,八倍体小偃麦、异附加系、异代换系和六倍体小偃麦(小麦新品种)的创制、鉴定和应用等.     

A MODEL SYSTEM OF A LONG-TERM PROGRAM OF EDUSATION DEVELOPMENT AND ITS APPLICATION

This paper studies a long-term program of education development in the light of the theory and method of system engineering.A complete mathematical-Simulant model system is used to describe the internal regularity of an edu-cation system inside a social-economic tystem,and to put forward a set of efficient method for education development programming.The mathematical-simulant model system dis-cussed in the paper is put to practical use in a regional education programming.     

STUDY ON YINCHUAN, A FAMOUS CITY WITH BEAUTIFUL SCENERY AND CHARACTERISTICS IN THE NORTH OF THE GREAT WALL

This paper presents the style and features of Yinchuan with a long history and culture,and analyses the relations between protection of the city and the modernization of the city.