Exploration of novel additives to portland cement binder systems

在每年的基础上，水泥和石油勘探/生产行业加在一起几乎占到 占加拿大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 帮助减少他们的碳足迹的变化。碳更新循环技术(CUT)是 这一努力，探索混凝土外加剂的新机会，可能在以下方面产生重大影响 提高了耐用性和碳固存。Cut已经开发了一种生产羧化的工艺 利用水泥窑及上游废旧二氧化碳捕集氧化石墨胺纳米片的研究 石油燃烧/焚烧/排放作业。GO纳米片代表了一种令人兴奋的新技术 混凝土，据报道在抗压和抗拉强度方面有所改善。它们的高表面积 颗粒为结合硅酸钙水合物相的生长提供了丰富的成核点。 混凝土中的集合体。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的工作性。这项研究计划将调查围棋 纳米片与常用混凝土外加剂的相互作用，特别是引气和 减水剂，并确定克服任何与吸附有关的不相容的策略。剪裁是 还探索了一种基于两组分金属氧化物和磷酸钾(K-磷酸)的添加剂，该添加剂已经 证明可以提高混凝土的抗压强度，但也可能改善耐腐蚀性 镶嵌的钢材。研究计划将调查GO和GO与腐蚀相关的耐久性方面 纳米片状和磷酸钾添加剂在氯离子渗透/扩散和加速腐蚀方面的作用 测试。

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.