Abstract

The environmental impact of ordinary Portland cement (OPC) can be decreased by using alternative precursors, such as non-ferrous metallurgy slags (NFMS), which can be alkali-activated to form an inorganic polymer binder (IP). However, an IP demands the use of a high molarity alkali-solution, which is expensive, has a relative high environmental footprint and limits the use of superplasticizers. In order to tackle these challenges, hybrid binders are proposed, which consist mainly of NFMS, a minor amount of OPC and are activated with a low molarity NaOH solution, in which the superplasticizers can be used effectively. A self-compacting hybrid paste with high early-age strength was developed step-by-step by investigating the effect of different amounts of raw materials on the reactivity, identified by semi-adiabatic calorimetry, and strength development. The obtained optimal hybrid binder formulation was (in wt%) 70 NFMS, 10 ground granulated blast furnace slag, 10 OPC, 8 limestone, 0.9 NaOH, 0.8 plasticizer and 0.3 bassanite; for a water-powder ratio of 0.19, the compressive strength was 20, 41 and 61 MPa at 1, 7 and 28 days, respectively. This study demonstrated that a hybrid binder can be produced from mainly NFMS, which can increase their valorisation potential.

Graphical Abstract

中文翻译：

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从有色冶金矿渣到混合水泥胶结料的调价：混合料设计和性能

摘要

普通硅酸盐水泥（OPC）的环境影响可以通过使用其他前体来降低，例如非铁冶金渣（NFMS），可以将其碱活化以形成无机聚合物粘结剂（IP）。然而，IP要求使用高摩尔浓度的碱溶液，这是昂贵的，具有相对较高的环境足迹并且限制了超塑化剂的使用。为了应对这些挑战，提出了杂化粘合剂，其主要由NFMS，少量的OPC组成并用低摩尔浓度的NaOH溶液活化，在其中可以有效地使用高效减水剂。通过研究不同数量的原料对反应活性的影响（通过半绝热量热法确定），逐步开发了具有高早期强度的自密实混合浆料。和力量发展。所获得的最佳混合粘合剂配方为（以重量％计）70 NFMS，10粒颗粒状高炉矿渣，10 OPC，8石灰石，0.9 NaOH，0.8增塑剂和0.3堇青石；水粉比为0.19时，在1、7和28天的抗压强度分别为20、41和61 MPa。这项研究表明，杂化粘合剂可以主要由NFMS生产，这可以增加其增值潜力。

图形概要