Process Engineering for Advanced Chemically Bonded Ceramics (CBC)

我们的目标是实现室内或近室T加工的低成本、低二氧化碳排放的化学结合陶瓷CBC，具有耐高温（> 1000 C）和目标离子封装（例如重 * 金属或核废料）性能。 (I)将利用室温或接近室温的处理，和（II）使用化学反应而不是烧结，以获得离子/共价键合的材料。适当处理 *CBC可导致在低T（<100 C）工艺中获得耐高T（> 1000 C）* 的陶瓷，因为化学反应CBC形成离子/共价键 * 并在升高的T下经历相变。这些过程的动力学将被研究以确定暴露于升高的T的这种CBC的耐火性增加的 * 速度。由于CBC工艺及其矿物/废物原料的上述两个基本要素 *（I，II），与OPC相比，其CO2足迹可小10倍。具体来说，我们提出了对先进的CBC进行研究，用于与环境保护广泛相关的（A）结构和（B）功能 * 应用，在两个主题1，2中：* 主题 *1：（1A）结构和（1 B）功能酸活化 * 磷硅酸盐水泥的基础和应用研究（PhD#1）。长期目标 * 是开发磷酸结合矿物衍生的低成本低碱（Na，K）钙铝硅酸盐（如钙长石）的工艺技术，作为（1A）结构OPC的可行替代品，和（1B）功能性高温（耐火）陶瓷。1A和1B之间的重叠允许 * 在简单的室温过程中获得大量耐高温 * 水泥，用于防火住宅，运输 *（例如隧道），工业（例如石化）或军事结构。主题 *2：碱活化（2A）结构和（2B）功能 * 地质聚合物GP（博士#2）的基础和应用研究。重点是低成本、* 室温处理碱活化的偏高岭石和废料 *，如铝硅酸盐粉煤灰，用于（2A）非晶、低CO2足迹GP的结构应用，目标是一般OPC替代品，和（2B）微结构工程、* 原位沸石结晶GP的功能应用，目标是吸收和保留Cs、Sr、*As或重金属Pb、Hg。

We aim to achieve room- or near-room T processed low-cost, low-CO2 emission Chemically Bonded Ceramics CBC with high-T (> 1000C) resistance and targeted ion encapsulation (e.g. heavy*metals or nuclear waste) properties. (I) room- or near-room-temperature*processing, and (II) use of chemical reactions, rather than sintering, to*achieve ionic/covalently bonded materials, will be utilized. Properly processed*CBC may lead to high-T (>1000C)*resistant ceramics obtained in a low-T (<100C) processes as the chemically reacting CBC form ionic/covalent bond*and undergo phase transformations at elevated T. The kinetics of these processes will be studied to determine the*speed of fire resistance increase of such CBCs exposed to elevated T. Because of the above two fundamentals*(I, II) of CBC processes and their mineral/waste raw materials, their CO2 footprint could be up to 10x smaller as compared to OPC. Specifically, we propose research into advanced CBCs for (A) structural and (B) functional*applications broadly related to environmental*protection, in two Themes 1,2:***Theme*1: Basic and Applied Studies on (1A) Structural and (1B) Functional Acid-Activated*Phospho-Silicate Cements (PhD#1). The long-term objective*is to develop process technology for phosphoric acid bonded mineral-derived,*low-cost low-alkali (Na, K) calcium alumino-silicates (such as anorthite) as (1A) viable replacement of structural OPC, and (1B) functional high-temperature (refractory) ceramics. An overlap between 1A and 1B allows to*obtain in a simple, room-temperature process large volumes of high-temperature*resistant cements for applications in fire-sensitive residential, transportation*(e.g. tunnels), industrial (e.g. petrochemical) or military structures.***Theme*2: Basic and Applied Studies on Alkali-Activated (2A) Structural and (2B) Functional*Geo-Polymers GP (PhD #2). The is focus on low-cost,*room-temperature processing of alkali-activated metakaolinite and waste*materials such as aluminosilicate fly-ash for (2A) structural applications of amorphous, low-CO2 footprint GP targeting general OPC replacement, and (2B) functional applications of microstructurally-engineered,*in-situ zeolite-crystallized GP targeting absorption and retention of Cs, Sr,*As, or heavy metals Pb, Hg.