Steel slag (SS) is rarely used as a sole binder in wet-cast concrete production, which, however, is successfully realized in this study through early-age ambient-pressure carbonation activation without cement involvement. Standard mechanical, performance-based, and microstructural investigation methods including compressive strength test, sulfate attack test, thermogravimetric analysis (TGA), mercury instruction porosimetery (MIP), etc., were adopted to verify the performance of the product. First, the cement-free wet-cast SS concrete presented comparable carbon sequestration capacity as OPC concrete. Second, the superior strength gain was verified on full-scale concrete products, and carbonation-activated wet-cast SS concrete pipes demonstrated improved performance, attributed to the high carbonation degree for SS and the densified microstructure. Last, the environmental and economic assessments confirm that 100 % substitution of cement with SS can significantly reduce CO emissions, energy consumption, and total cost for carbonation-activated wet-cast SS concrete, which contributes to both environmental protection and sustainable development in the construction industry.

中文翻译：

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钢渣常压碳化活化湿浇无水泥混凝土的研制

钢渣（SS）很少用作湿浇混凝土生产中的唯一粘合剂，然而，在本研究中通过早期常压碳化活化而无需水泥参与，成功实现了这一点。采用标准的机械、性能和微观结构研究方法，包括抗压强度测试、硫酸盐侵蚀测试、热重分析（TGA）、汞指示孔隙率测定（MIP）等来验证产品的性能。首先，无水泥湿浇SS混凝土的碳封存能力与OPC混凝土相当。其次，在全尺寸混凝土产品上验证了优异的强度增益，并且碳化活化湿法浇注不锈钢混凝土管表现出改进的性能，这归因于不锈钢的高碳化度和致密的微观结构。最后，环境和经济评估证实，用SS 100%替代水泥可以显着降低碳化活化湿浇SS混凝土的CO排放、能源消耗和总成本，有助于环境保护和建筑的可持续发展。行业。