Exploration of novel additives to portland cement binder systems

每年水泥和石油勘探/生产行业的总和几乎占全球总产量的1 占加拿大绿色温室气体排放总量的四分之一。两个行业都在积极识别和实施 以帮助减少他们的碳足迹。碳升级循环技术（Carbon Upcycling Technologies，CUT）是 这一努力，探索混凝土添加剂的新机会，可能会产生重大影响， 增加耐久性和碳封存。CUT开发了一种生产羧化 通过捕获来自水泥窑和上游的废二氧化碳来制备氧化石墨（GO）纳米片 石油燃烧/焚化/排气作业。GO纳米片代表了一种令人兴奋的新技术， 混凝土，据报道，在压缩和拉伸强度的改善。这些的高表面积 颗粒为结合的硅酸钙水合物相的生长提供了丰富的成核位点 聚合成混凝土。同时，GO纳米片可以吸附水和其他有机物， 外加剂，并可能干扰新拌混凝土和易性。本研究计划将调查GO 纳米片与常用混凝土外加剂的相互作用，特别是加气和 减水剂，并确定克服任何吸附相关的不相容性的策略。切割 还开发了一种基于金属氧化物和磷酸钾（K-磷酸盐）的双组分添加剂， 证明，以提高混凝土的抗压强度，但也可以提高耐腐蚀性 嵌入式钢。该研究计划将调查与腐蚀相关的耐久性方面的两个GO 在氯化物渗透/扩散和加速腐蚀方面的纳米片和磷酸钾添加剂 试验.

On an annual basis the combined cement and oil exploration/production industries account for almost one quarter of Canada's total green house gas emissions. Both industries are actively identifying and implementing changes to help reduce their carbon footprint. Carbon Upcycling Technologies (CUT) is an important part of that effort, exploring new opportunities for concrete additives that could have a major impact in terms of increased durability and carbon sequestration. CUT has developed a process for the production of carboxylated graphine oxide (GO) nano-sheets by capturing waste carbon dioxide from cement kilns and upstream petroleum flaring/incinerating/venting operations. GO nano-sheets represent an exciting new technology for concrete, with reported improvements in compressive and tensile strength. The high surface area of these particles provide abundant nucleation sites for the growth of the calcium-silicate-hydrate phases that bind aggregates together in concrete. At the same time, GO nano-sheets can adsorb water and other organic admixtures, and may interfere with fresh concrete workability. This research program will investigate GO nano-sheet interactions with commonly used concrete admixtures, specifically air-entraining and water-reducing agents, and identify strategies to overcome any adsorption-related incompatibilities. CUT is also exploring a two-part metal-oxide and potassium phosphate (K-phosphate) based additive that has been demonstrated to enhance the compressive strength of concrete, but may also improve the corrosion resistance of embedded steel. The research program will investigate corrosion-related durability aspects of both the GO nano-sheet and K-phosphate additives in terms of chloride permeability/diffusion and accelerated corrosion testing.