GRAPHene enhanced pre-CAST concrete (GRAPHcast)

GRAPHene 增强预制混凝土 (GRAPHcast)

• 批准号: 10081858
• 金额: $ 95.58万
• 依托单位: NATIONWIDE ENGINEERING RESEARCH AND DEVELOPMENT LTD
• 依托单位国家: 英国
• 项目类别: Collaborative R&D
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=10081858
• 关键词: GRAPHene; enhanced; pre; CAST; concrete

Pre-cast concrete is more affordable, controllable, quicker-to-install than onsite concrete-casting and aligns with UK Govt ambition to promote off-site manufacturing/modular construction.\[1\]However, today's pre-cast concrete mixes pose numerous challenges:1\. The production of cement (concrete's binding agent) is highly-carbon-intensive (860kgCO2e/tonne)\[2\].2\. The cement content required to reach design strength gives pre-cast concrete a high carbon footprint (256-329kgCO2e/cu.m), despite using cement replacements.3\. Cement replacements retard curing/strength-development (16-hour-demoulding, 14-day safe-transport), limiting productivity and risking damage during handling/storage.4\. Steel reinforcement enhances early-age-strength but increases product-cost and embodied-carbon.Nationwide-Engineering-Research-and-Development-Ltd(NERD)'s patented Graphene-Enhanced-Concrete(GEC) admixture, CONCRETENE, has been previously developed for the ready-mixed concrete sector, where the strength-enhancing effect of graphene enables reduced cement-content, or reduced concrete-volumes compared to traditional Ordinary-Portland-Cement(OPC), or replacement-material blends (e.g.CEM-III). These material-savings deliver a significantly reduced carbon-footprint (up to 30% reduction).In addition to decarbonisation, CONCRETENE accelerates strength-development/reduces curing time (e.g. 220-Tonne CONCRETENE slab reached 28-day design strength in just 24-hours in I-UK:99366). CONCRETENE is therefore ideally suited to address the major precast sector challenges, but first needs to be reformulated to meet the more complex-chemistries and production-demands of precast vs ready-mixed.The GRAPHcast project is a collaboration between CONCRETENE developers, NERD, and Roger-Bullivant-Ltd(RBL), part of the international Vinci-Group that incorporates Soletanche-Bachy, world-leader in building-foundations, with operations in 60 countries.Alongside iterative CONCRETENE reformulation by NERD, testing, scale-up, and site-trials by RBL will assess performance in precast piles and beams for residential-buildings and low-rise structures. Finally, by validating performance on a live-construction site, GRAPHcast will pave the way for rapid commercialisation of CONCRETENE. Although precast is a smaller market than ready-mixed concrete (and therefore less attractive to private-investors), it is easier to exploit in the short-term, since sales can leverage the well-established sales-network of RBL, in contrast to relying on NERD making direct-sales to individual companies.\[1\]Construction-Playbook:https://www.gov.uk/government/publications/the-construction-playbook\[2\] ICE: https://www.ice.org.uk/media/200i0yqd/2022-04-26-low-carbon-concrete-routemap-final\_rev.pdf

预制混凝土比现场混凝土浇筑更经济、更可控、安装更快，并且符合英国政府促进场外制造/模块化施工的雄心。\[1\]然而，当今的预制混凝土混合物提出了许多挑战：1\。水泥（混凝土的粘结剂）的生产属于高碳密集型（860kgCO2e/吨）\[2\].2\。尽管使用了水泥替代品，但达到设计强度所需的水泥含量使预制混凝土具有较高的碳足迹（256-329kgCO2e/cu.m）。3\。水泥替代品会延迟固化/强度发展（16 小时脱模，14 天安全运输），限制生产率并存在搬运/储存过程中损坏的风险。4\。钢筋增强了早期强度，但增加了产品成本和隐含碳。全国工程研究与开发有限公司 (NERD) 的专利石墨烯增强混凝土 (GEC) 外加剂 CONCRETENE 之前是为预拌混凝土领域开发的，石墨烯的强度增强效果可以降低水泥含量，或减少水泥用量。 与传统普通波特兰水泥 (OPC) 或替代材料混合物（例如 CEM-III）相比，混凝土体积更小。这些材料节省可显着减少碳足迹（减少高达 30%）。除了脱碳之外，CONCRETENE 还可以加速强度发展/缩短固化时间（例如，在 I-UK:99366 中，220 吨 CONCRETENE 板仅在 24 小时内就达到了 28 天的设计强度）。因此，CONCRETENE 非常适合应对预制行业的主要挑战，但首先需要重新配制，以满足预制件与预拌件相比更复杂的化学成分和生产需求。GRAPHcast 项目是 CONCRETENE 开发商、NERD 和 Roger-Bullivant-Ltd (RBL) 之间的合作，Roger-Bullivant-Ltd (RBL) 是国际 Vinci 集团的一部分，该集团包含了世界领先的 建筑基础，在 60 个国家开展业务。除了 NERD 迭代的 CONCRETENE 重新配制之外，RBL 还将进行测试、扩大规模和现场试验，评估住宅建筑和低层结构的预制桩和梁的性能。最后，通过在现场施工现场验证性能，GRAPHcast 将为 CONCRETENE 的快速商业化铺平道路。尽管预制件的市场比预拌混凝土小（因此对私人投资者的吸引力较小），但短期内更容易开发，因为销售可以利用 RBL 完善的销售网络，而不是依靠 NERD 直接向个人销售 \[1\]Construction-Playbook：https://www.gov.uk/government/publications/the-construction-playbook\[2\] ICE： https://www.ice.org.uk/media/200i0yqd/2022-04-26-low-carbon-concrete-routemap-final\_rev.pdf