The differences between self - compacting concrete and ordinary concrete are notable , to assure the safety of reinforcing self - compacting concrete structures , it is necessary to discuss the bond behavior between self - compacting concrete and reinforcing bar ( 2 )自密实高性能混凝土与钢筋的粘结锚固性能研究。自密实混凝土与钢筋可靠的粘结锚固性能是自密实混凝土配筋结构安全性的重要保证。
Due to the diversity and complexity of the scc ingredients which influence each other , it is difficult to describe the relationship between the workability of fresh concrete and a single mixing effect factor , so as the mechanical properties of hardened concrete 由于自密实混凝土组分复杂多样，各组分间又相互影响，故其拌合物的工作性和硬化后的力学性能很难用单因素的回归关系加以描述。
Our country begeinged to research for self - compacting concrete from the early of the 90th . beijing 、 shanghai and shenzhen applied self - compacting concrete about 50000 litres until 1995 , mainly in sites for underground - dipping 、 complex reinforcing steel and no - vibyating 我国从90年代初开始其研究, 1995年上海、北京、深圳等城市应用自密实混凝土5万余立方米,主要应用于地下暗挖、配筋形状复杂等无法浇筑和振捣的部位。
Japanese architecture science institute has putout manual for mixture proportioning , production and placement of self - compacting concrete , and recommendation for self - compacting concrete . it ’ s known that japanese have been actuly applied research ages for self - compacting concrete 日本自1987年开始致力于自密实混凝土的研究,至今使用已有120万立方米以上。日本建筑学会在1997年1月出版了高流动性混凝土材料、配比、制造、施工指引及解说。
Using processed march cylinder , tapered circular mould , u - shaped instrument , l - shaped concrete fluidity instrument and some other testing instruments , and after research and study to physical and chemical property of various raw material . systematic tests have been carried out in respect of consistency between cement and additive , concrete fluidity , concrete filling - up - space and penetration capability and concrete anti - segregation property , basing on prudent and careful analysis to results of 34 - time tests a nd more than 500 data , and with utilization of combined additive , we finally conclude the proper mix design range for the self - densifying high performance concrete with ideal working performance at all respects 通过加工的march筒、截锥形圆模、 u型仪、 l型混凝土流动仪等实验仪器以及对各种原材料的物理及化学性能展开详尽的调查研究，进行了多种材料下的水泥与外加剂相容性、混凝土的流动性、混凝土的填充性和钢筋通过性、混凝土的抗离析性等系统试验，在对34组试验、 500多个数据的详细认真分析的基础上，利用复合后的外加剂，得出各项工作性能均较佳的自密实混凝土所用原材料比例范围。
In this paper , the so preparing self - compacting concrete with low and middle strength using super fine mountain sand artifical sand and phosphorus slag is studied systemically . through the study the influence of the shape , the proportion of the dust and the grade of sand to the workability and the mechanical property of self - compacting concrete , it is found that super fine mountain sand artifical sand are not suit to prepare low and middle strength self - compacting concrete , but when they are combined and the additive and assistant band material are used , c20 - c40 high performance self - compacting concrete is prepared ; the corresponding additive is developed to solve the delamination caused by the low proportion of banding material ; the evaluating system for the workability of low and middle strength self - compacting concrete is built ; the controlling method for production , construction and curing was set up . and the result of the research is applied into several projects 通过分析特细山砂和机制砂的颗粒形态、粉末含量、颗粒级配等特性对自密实混凝土的工作性能和力学性能的影响，发现特细山砂、机制砂不宜单独用于配制中低强度等级自密实混凝土，宜将特细山砂和机制砂进行合理复配，并选择合适的外加剂和矿物掺合料，优化配合比设计，可生产c20 c40中低强度等级自密实高性能混凝土；研制开发出了具有高效减水、保塑、抗离析功能的外加剂，有效解决了中低强度等级自密实混凝土由于胶凝材料用量少而出现的离析、泌水问题；应用正交设计方法，对因素和水平进行合理选择，确定了生产中低等级自密实混凝土的最优配合比；建立了中低强度等级自密实混凝土的工作性评价体系；提出了生产、施工及养护的质量控制技术方法。
It is high performance concrete of low water - binder ratio . with its own gravity and without any vibration , it can fill up the space automatically . with high adding quantity of fly ash and slag , high quality water reducing agent and other compound admixture is the most important technology of this kind of high performance concrete . scc focus on high workability at the same time on high strength and high durability through choosing the composite of aggregate , additives , content of cementions material , admixture reasonably and the optimum design of mix proportion 本文研究了采用吉林省本地原材料和常规生产工艺配制c40自密实混凝土的制作技术,采用水胶比、粉煤灰掺量、砂率、胶凝材料总量四个因素进行配合比的正交设计,试验分析了自密实混凝土拌合物的工作性以及硬化后的力学性能、耐久性和生产与施工注意事项,并对其经济性做出了客观评价,本次试验为吉林地区自密实混凝土的推广应用提供了数据基础。
The scc has the following advantages : remarkably reducing the noisy pollution and the worker s labor intensity in construction , deducing the rough surface or segregation because of missing - vibration or excessive - vibration in conventional construction , resolving the quality - defect problems resulting from lacking - vibration in the section of complex shapes and densely - packed reinforcement area . at the same time , large of industrial solid waste such as fly ash and blast furnace slag is utilized in the proportioning of scc . it is helpful in comprehensive utilization of resource and environment protection , so the scc belongs to " green concrete " , it is a branch of hpc which will be developed in the future 这种混凝土可以显著降低混凝土施工中的噪音污染；大幅度减轻工人的劳动强度；减少传统混凝土施工中因漏振或过振造成的麻面或离析；解决了配筋密集、结构复杂部位因振捣不足而造成的质量缺陷问题；同时，由于自密实混凝土在配制中，大量利用粉煤灰、高炉矿渣等工业固体废弃物，有利于资源的综合利用和生态环境的保护；从而被誉为“绿色混凝土” ，是未来混凝土向高性能发展的方向之一。
The pore of schsc is smaller and more homogeneous than that of nhsc . fourth , the contribution to concrete microstructure of the expanding agent is very little at early ages ; however it is obvious at late ages to a certain extent . fifth , for the contribution of the mixing content of fly ash is that the contribution to the degree of early age concrete hydration is obvious to some extent , and that the contribution to the shape of hydrate of concrete is obvious 实验研究表明:自密实混凝土由于粉煤灰的掺量较高，其早期的水化程度较低，但后期其细观结构较普通混凝土好；自密实混凝土的骨料界面过渡区与水泥石的差别始终较普通混凝土小，其孔隙较普通混凝土小而均匀；膨胀剂对自密实混凝土早期的细观结构影响不大，但对后期的细观结构有一定影响；粉煤灰掺量对自密实混凝土的早期水化程度有一定影响，且其对自密实混凝土水化物的形态影响较大。
