Durable Low Carbon Reinforced Concrete for Challenging Environments (DULCET)

由于氯化物和碳酸盐引起的钢筋腐蚀/用常规水泥和低碳钢钢筋制成的混凝土结构的过早劣化，维修费用非常大。水泥生产对全球二氧化碳排放量的影响是巨大的（约为100万吨）。占全球排放量的8%）。因此，混凝土资产的所有者（例如环境署、公路管理局）强烈要求指定低碳混凝土，同时解决风险规避/保守的建筑行业的问题。碱激发水泥基材料（AACM）可以节省80%的二氧化碳，但对它们在腐蚀性服务环境（如海洋或高速公路）中对钢筋腐蚀的保护了解有限，限制了它们的市场增长。Cemfree（由一家雄心勃勃的中小企业制造）是英国领先的AACM。DULCET将开发/证明一种新的Cemfree钢筋混凝土系列，用于侵蚀性氯化物环境（来自沿海盐水和高速公路除冰），通过与非腐蚀性复合钢筋（基于玄武岩纤维）而不是钢材相结合，有效地“设计出”钢筋腐蚀。这将加速Cemfree AACM在恶劣环境和更广泛的钢筋混凝土市场中的采用，因为无需担心钢筋腐蚀（或者等到完成复杂的长期研究才制定AACM指南，以确保保护钢材免受腐蚀）。新的玄武岩纤维增强材料还比传统增强材料节省40%的碳，减轻重量，并且在使用寿命结束时可回收。DULCET将使玄武岩钢筋市场增长，解决障碍并为制造商带来规模经济，该项目将解决诸如Cemfree与创新钢筋的粘合等问题/担忧，开发通用混凝土构件设计，钢筋布局，评估建筑工地的可建造性，并证明钢筋构件的耐久性和工程性能。

The cost of repairs due to chloride and carbonation-induced reinforcement corrosion/premature deterioration of concrete structures made with conventional cements and mild steel reinforcement is very large. The impacts of cement manufacture on global CO2 emissions are significant (approx. 8% of global emission). There is thus a strong demand from owners of concrete assets (eg Environment Agency, Highways Authorities) to specify lower carbon concretes whilst addressing concerns a risk averse/conservative construction industry. Alkali Activated Cementitious Materials (AACMs) can offer 80% savings in embodied CO2 but limited understanding of the protection they offer to corrosion of steel reinforcement in aggressive service environments (such as marine or highways) is limiting their market growth. Cemfree (manufactured by an SME with strong ambitions to grow) is a leading UK AACM.DULCET will develop/prove a new Cemfree reinforced concrete range for use in aggressive chloride environments (from saline coastal water and highway de-icing) where reinforcement corrosion is effectively "designed-out" through combining with a non-corroding composite reinforcement (based on basalt fibre) instead of steel. This will accelerate adoption of Cemfree AACM in aggressive environments and wider markets for reinforced concrete as there is no need to worry about reinforcement corrosion (or to wait until completion of complicated long-duration research to develop guidance for AACMs to ensure protection of steel from corrosion). The new basalt fibre reinforcement also offers 40% carbon savings on conventional reinforcement, weight savings and is recyclable at end-of-life. DULCET will enable the basalt reinforcement market to grow, address barriers and bring economies of scale to manufacturers.The project will address issues/concerns such as the bond of Cemfree to the innovative reinforcement, develop generic concrete component designs, rebar layouts, assess buildability on construction sites and prove durability and engineering performance of the reinforced components.