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.     

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.     

Regional partitioning of agricultural non-point source pollution in China using a projection pursuit cluster model

A projection pursuit cluster(PPC) model was used to analyze the regional partitioning of agricultural non-point source pollution in China.The environmental factors impacting the agricultural non-point source pollution were compiled into a projection index to set up the projection index function.A novel optimization algorithm called Free search(FS) was introduced to optimize the projection direction of the PPC model.By making the appropriate improvements as we explored the use of the algorithm,it became simpler,and developed better exploration abilities.Thus,the multi-factor problem was converted into a single-factor cluster,according to the projection,which successfully avoided subjective disturbance and produced objective results.The cluster results of the PPC model mirror the actual regional partitioning of the agricultural non-point source pollution in China,indicating that the PPC model is a powerful tool in multi-factor cluster analysis,and could be a new method for the regional partitioning of agricultural non-point source pollution.     

防腐剂及农村杨木建筑木结构防腐的应用研究

我国北方农村的建筑用材,多以杨、柳、榆等速生树种为主,但这些木材易发生腐朽与虫蛀。本课题对适合农村建筑中杨木等木结构的防腐、防虫剂和防腐涂料的物理化学性能,对菌、虫毒效等进行了一系列的室内外试验,提出了简易的防腐防虫处理方法。在试验基础上,选用效果较好的水溶性、油溶性防腐、防虫剂和防腐油漆,并进一步在北京大兴县农村进行了扩大应用试验。经两年多观察,尚未发现虫蛀与腐朽,但未防腐的檩条已发生虫蛀。     

MODELLING DESIGN OF THE CAIYAN TUNNEL IN CHONGQING

A modelling design approach for the preliminary dimensioningof underground opening supports is presented in this paper. The method is basedon the model test results under the condition of plane deformation, It is tobe used for the analysis and design of the primary support measures and theproper thickness of secondar linings as welt as appropriate construelion tech-niques adapted to the condition of the Caiyuan Tunnel in Chongqing.