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The material design of soft environmental high performance cement for the purpose of the increase in the waste treatment quantity.

以增加垃圾处理量为目的的软质环保高性能水泥的材料设计。

基本信息

批准号：
15560393
负责人：
SAKAI Etsuo
金额：
$ 2.24万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

Increasing the interstitial phase or C_3A contents in cement and blended cement are an effective measure to enlarge the use of industrial waste or by-products. It is necessary to clarify the hydration and the formation of microstructures of cement in order to design the optimum cement matrix. In this study, material design of the cement in which increase of the waste treatment quantity and security of required performance are possible is proposed. High-performance application and heavy metal fixation of the calcium aluminate hydrated products for functionally utilizing the C_3A or Calcium aluminum phase have also been clarified. When waste disposals were utilized as blended cement, the CO_2 reduction is possible, and features in hydration and texture formation of various additives are arranged, and a basic knowledge for reflecting in the material design shown in the following has been arranged. In blended cement, it is equal to the replacement ratio, the CO_2 reduction is possible. How … More ever, hydration and texture formation of various types of blended cements were arranged, and a basic data for reflecting in the material design shown in the following was arranged.1)The reaction ratio of granulated blast furnace slag(BFS) reaches around 50% at 28d, reacted very slowly thereafter. The fineness and the basicity of BFS are influenced on the reaction ratio of BFS at early stage.2)Fly ash(FA) didn't react until 7d. Between 28d and 180d, the reaction ratio of FA is related to the basicity of glass phase in FA.3)The early hydration of alite was accelerated even in the case of additives.4)When BFS or FA is added in Blended cements, the reaction of belite is retarded at late stage.5)The early reaction of C_3A is retarded by adding of limestone powder(LSP) or slowly cooled blast furnace slag powder(CFS). In the case of LSP blended cement, C_3A hydration is retarded for the reaction of LSP and C_3A. When CFS is added, thiosulfate ion which is leached from CFS is retarded on the hydration of C_3A. leached to CFSIn addition, the new blended cement of which increase of the waste treatment quantity and improvement in the performance are possible is being proposed by using of BFS and CFS Less

增加水泥及混合水泥中的间隙相或C_3A含量是扩大工业废渣或副产物利用的有效措施。为了设计出最佳的水泥基质，有必要弄清水泥的水化过程和微观结构的形成。在本研究中，提出了既能提高垃圾处理量，又能保证所要求性能安全的水泥材料设计。阐明了功能利用C_3A或钙铝相的铝酸钙水化产品的高性能应用和重金属固定。将废渣用作掺和水泥时，可以降低CO_2，整理了各种外加剂的水化和织构形成的特点，并掌握了反映在以下材料设计中的基本知识。在混合水泥中，当取代率相等时，CO_2的降低是可能的。如何使用…此外，还对不同类型混合水泥的水化和织构形成进行了排序，并整理了反映在材料设计中的基本数据如下：1)矿渣颗粒的反应率在28d时达到50%左右，此后反应非常缓慢。矿渣的细度和碱度影响矿渣早期的反应速率。2)飞灰直到7d才发生反应。在28d~180d之间，FA的反应速率与FA中玻璃相的碱度有关。3)即使在外加剂的作用下，阿利特的早期水化也被加速。4)当掺入BFS或FA时，贝利特的反应在后期被抑制。5)掺入石灰石粉(LSP)或缓冷高炉矿渣粉(CFS)后，C3A的早期反应被延缓。在掺LSP水泥的情况下，由于LSP与C3A的反应，抑制了C3A的水化。加入CFS后，CFS中的硫代硫酸盐离子对C3A的水化有一定的抑制作用。此外，还提出了一种可以增加垃圾处理量和改善性能的新型混合水泥。