A bp neural network model is designed to analyze and solve the problem , the relationship of operational life of concrete construction and environmental corrosion mediator 设计了一个bp神经网络网络模型来分析解决这一问题，研究处于硫酸盐侵蚀下混凝土结构使用寿命与环境侵蚀介质间的关系。
There is correspondence in evaluating sulfate resistance of cement paste by three test methods such as rapid boiling , gypsum mixing and wet - dry test . high strength grade cement can meliorate property of sulfate resistance 外掺石膏法、干湿交替法以及快速沸煮法三种实验方法对评价水泥砂浆的抗硫酸盐侵蚀性能有较好的一致性；高标号水泥品种对抗硫酸盐侵蚀性能有很好的改善作用。
This paper unfolds engineering disposition and theoretical research of negative temperature high performance concrete ( nthpc ) with the damage of many factors motivation , the project background based on qing - zang railway engineering , which is one of four - emphasized engineering during the tenth five - plan . due to the difference of environment of construction and service between nthpc and ordinary concrete , and therefore durability of nthpc is required to higher level . at a first , nthpc must avoid frozen damage at early age and possess anti - freezing property at later period , in order to meet engineering practicable application need , and this are two emphasized and difficult problems , as for nthpc ; by means of mechanism analysis about deicing - agent ingredient and anti - freezing at early period , adopting composite technique routine of mineral addition + anti - freezing element + water - reducer4 - air - entraining + anti - erosion of steel component etc , based on orthogonal experimental approach , fd - 1 composite functional admixtu re was manufactured , which has more property and orientation on qing - zang railway 负温混凝土由于和普通混凝土在施工环境及服役环境上存在的差异，因此表现为比普通混凝土更为较高的耐久性要求；负温混凝土首先要避免早期的冻害以及具备长期抗冻性能，才能够满足工程实际应用的要求，这也是负温混凝土必须解决的两大技术关键；通过对目前常用防冻剂组分作用机理的分析研究及混凝土早期防冻机理探讨，采用矿物外加剂+防冻组分+高效减水剂+引气+阻锈组分功能复合的技术路线，通过正交试验设计复配了适应青藏铁路工程要求的专用多功能复合型外加剂fd - 1 ；并在此基础上配制不同等级负温高性能混凝土，开展一系列包括硫酸盐侵蚀、氯离子渗透、抗冻融循环、收缩及耐磨性等耐久性能研究；通过对fd - 1组分和掺量的调整，优化负温混凝土在施工特性、力学指标和耐久性三个方面的兼容、协调性。
The liquid - gas method is improved based on the above methods , overcoming the defects of gbj82 - 85 . using the liquid - gas method , permeability condition of concrete can be tested and indicated quickly , efficiently , and the influences on concrete of alkali - aggregate reaction , sulfate attack , carbonization , steel rust , freeze and thaw can be inflected indirectly . it is significant on the research and monitor on the durability of concrete 溶液气压法是在上述方法之上进行改进提高的，克服了国标gbj82 - 85方法中的许多不足之处，能够多角度、快速、高效、真实、准确地再现现场混凝土的渗透情况，并且能间接反映碱-骨料反应、钢筋锈蚀、碳化、硫酸盐侵蚀及冻融破坏的影响，对混凝土耐久性的监测与研究具有重要意义。
For the background of our ten - five main scientific project , based upon the structure and compositions of expert system and their field characteristics and software development mode , the ideas and methods of expert system of concrete sulfate resistance project are discussed in this article , and a prototype of system integration is given 本文结合国家“十五“重点攻关项目(混凝土安全性专家系统)中的子系统?抗硫酸盐侵蚀专家系统，根据专家系统的组成结构和领域特点，结合知识结构的一种新的组织和表示模式，研究了专家系统开发的实现技术，并对其进行了最后的集成。
For concrete structure in the practical engineering , the non - mechanics damages , such as alkali - aggregate reaction , sulfate attack , carbonization , steel rust , freeze and thaw , and so on , are unavoidable due to the exist of erosive media . the deterioration form of mono or multi - factor influences on the concrete property of construction and durability greatly , and shortens the service life of the concrete to a large extent . permeability of concrete is the most important factor for these non - mechanics damages , so the permeability test of concrete is the normal and required item to study the durability of concrete 实际工程中的混凝土结构，因侵蚀性介质的存在而使非力学破坏行为无处不在，这些非力学破坏行为包括碱集料反应、硫酸盐侵蚀、碳化、钢筋锈蚀、冻融等，单一的破坏形式或多形式的复合破坏作用对混凝土结构性能及耐久性能均有着较为严重的影响，在很大程度上缩短了建筑物的服役年限，而这些非力学破坏在很大程度上取决于其渗透性，所以测试混凝土渗透性能是研究判断混凝土耐久性的常规必测项目。
The paper designs some teams of different mix proportion concrete according to the different replacement of the recycled aggregates and fly ash , and researches their working properties and mechanical properties , and analyses influence factors of the working properties and the mechanical properties of the recycled concrete such as the replacement rate of recycled aggregates , the replacement amount of fly ash , surface treatment of recycled aggregates , adding the high range water reducing agents and mineral admixture , etc . the paper researches the durability of recycled concrete as to the sulphate - corrosion resistance , the permeability resistance , the frost - resistance , etc . and analyzes some factors , as to the replacement of recycled aggregates , the replacement of fly ash , the surface treatment of recycled aggregates , adding high range water reducing agent and mineral admixture , bring the influence to the properties of recycled concrete , and analyzes the economic feasibility of the application of the recycled concrete 本文根据再生骨料和粉煤灰的不同取代率设计了几组不同配合比的再生混凝土，对其工作性能和力学性能进行了研究，分析了再生骨料的取代率、粉煤灰的取代量、表面处理再生骨料及掺加高效减水剂和矿物外加剂等因素对再生混凝土的工作性能和力学性能的影响。本文根据配制的再生混凝土对其抗硫酸盐侵蚀性能、抗渗性、抗冻性等耐久性进行了研究，分析了再生骨料的取代率、粉煤灰的取代量、表面处理再生骨料及掺加高效减水剂和矿物外加剂等因素对再生混凝土的这些性能的影响。并对再生混凝土的应用进行了经济可行性分析，为再生骨科和再生混凝土的应用提供了有利的支持。
At the same time fly ash and silica fume also can repress the anti - sulfate attack and the alkali - aggregate reaction ; in addition , the relation between air - entraining admi xture , cementitious materials quantity with freezing - thaw property of concrete were studied ; and according to the different affecting factors the durable life of concrete was estimated 同时粉煤灰、硅灰还可以抑制硫酸盐侵蚀及碱集料反应；此外，分析了混凝土中含气量、胶凝材总量等与混凝土抗冻性的关系。并且，根据相应影响因素对混凝土耐久性寿命进行了预测。
The research work about durability of high - performance self - compacting micro - expansive concrete show that the micro - expansive function and micro - bubble producing function of mineral admixture h can improve the impermeability , frost - resistance ability and sulfate eroding resistance ability etc of self - compacting concrete 研究了免振捣微膨胀高性能混凝土的各项耐久性能，结果表明：山于新型矿物添加剂h的微膨胀功能和微量发气功能，研制成功的免振捣微膨胀高性能混凝土具有优良的抗渗性、抗冻性、抗硫酸盐侵蚀等耐久性能。
