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Synthesis of Portland cement and calcium sulfoaluminate-belite cement for sustainable development and performance.

机译：合成波特兰水泥和硫铝铝酸钙-贝利特水泥以实现可持续发展和性能。

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摘要

Portland cement concrete, the most widely used manufactured material in the world, is made primarily from water, mineral aggregates, and portland cement. The production of portland cement is energy intensive, accounting for 2% of primary energy consumption and 5% of industrial energy consumption globally. Moreover, portland cement manufacturing contributes significantly to greenhouse gases and accounts for 5% of the global CO2 emissions resulting from human activity. The primary objective of this research was to explore methods of reducing the environmental impact of cement production while maintaining or improving current performance standards. Two approaches were taken, (1) incorporation of waste materials in portland cement synthesis, and (2) optimization of an alternative environmental friendly binder, calcium sulfoaluminate-belite cement. These approaches can lead to less energy consumption, less emission of CO2, and more reuse of industrial waste materials for cement manufacturing. In the portland cement part of the research, portland cement clinkers conforming to the compositional specifications in ASTM C 150 for Type I cement were successfully synthesized from reagent-grade chemicals with 0% to 40% fly ash and 0% to 60% slag incorporation (with 10% intervals), 72.5% limestone with 27.5% fly ash, and 65% limestone with 35% slag. The synthesized portland cements had similar early-age hydration behavior to commercial portland cement. However, waste materials significantly affected cement phase formation. The C3S--C2S ratio decreased with increasing amounts of waste materials incorporated. These differences could have implications on proportioning of raw materials for cement production when using waste materials. In the calcium sulfoaluminate-belite cement part of the research, three calcium sulfoaluminate-belite cement clinkers with a range of phase compositions were successfully synthesized from reagent-grade chemicals. The synthesized calcium sulfoaluminate-belite cement that contained medium C4A3 S¯ and C2S contents showed good dimensional stability, sulfate resistance, and compressive strength development and was considered the optimum phase composition for calcium sulfoaluminate-belite cement in terms of comparable performance characteristics to portland cement. Furthermore, two calcium sulfoaluminate-belite cement clinkers were successfully synthesized from natural and waste materials such as limestone, bauxite, flue gas desulfurization sludge, Class C fly ash, and fluidized bed ash proportioned to the optimum calcium sulfoaluminate-belite cement synthesized from reagent-grade chemicals. Waste materials composed 30% and 41% of the raw ingredients. The two calcium sulfoaluminate-belite cements synthesized from natural and waste materials showed good dimensional stability, sulfate resistance, and compressive strength development, comparable to commercial portland cement.
机译：波特兰水泥混凝土是世界上使用最广泛的人造材料，主要由水，矿物骨料和波特兰水泥制成。波特兰水泥的生产是能源密集型的，占全球一次能源消耗的2％和工业能源消耗的5％。此外，波特兰水泥生产对温室气体有重要贡献，占人类活动导致的全球二氧化碳排放量的5％。这项研究的主要目的是探索在保持或提高现行性能标准的同时减少水泥生产对环境的影响的方法。采取了两种方法：（1）将废料掺入硅酸盐水泥的合成中；（2）优化替代性环保粘结剂硫代铝酸钙-贝利特水泥。这些方法可以减少能源消耗，减少CO2排放以及将工业废料更多地用于水泥生产。在研究的波特兰水泥部分中，成功地从试剂级化学品，掺入0％至40％的粉煤灰和掺入0％至60％的矿渣的试剂级化学品中成功合成了符合ASTM C 150中用于I型水泥的成分规范的波特兰水泥熟料（间隔为10％），72.5％的石灰石和27.5％的粉煤灰以及65％的石灰石和35％的矿渣。合成的硅酸盐水泥具有与商业硅酸盐水泥相似的早期水合行为。但是，废料显着影响水泥相的形成。 C3S--C2S比率随着废料掺入量的增加而降低。这些差异可能会影响使用废料时用于水泥生产的原料配比。在研究的硫铝酸铝钙铝酸盐-水泥水泥熟料中，成功地从试剂级化学物质中合成了三种具有不同相组成的硫铝酸铝钙铝盐-水泥水泥熟料。合成的含有中等C4A3 S和C2S含量的硫代铝酸盐-钙钛矿-水泥显示出良好的尺寸稳定性，耐硫酸盐性和抗压强度，并被认为是与硅酸盐水泥具有可比性的最佳相组成。 。此外，成功地利用天然和废料（例如石灰石，铝土矿，烟道气脱硫污泥，C类粉煤灰和流化床灰）成功地合成了两种硫铝铝酸钙-贝利石水泥熟料，并与由试剂-合成的最佳硫铝铝酸钙-贝利石水泥成比例。等级的化学品。废料分别占原料的30％和41％。与天然硅酸盐水泥相比，由天然和废料合成的两种硫铝铝酸盐-贝利特钙水泥显示出良好的尺寸稳定性，耐硫酸盐性和抗压强度。

著录项

  • 作者

    Chen, Irvin Allen.;

  • 作者单位

    The University of Texas at Austin.;

  • 授予单位 The University of Texas at Austin.;
  • 学科 Engineering Civil.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 214 p.
  • 总页数 214
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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