Alkali-activated materials (AAMs) shows great potential to be a candidate of ordinary Portland cement (OPC) when considering the relative lower carbon emission of AAMs. In the present work, the authors investigated the influence of sodium sulfate (Na₂SO₄) content on the properties of lime (CaO) activated slag to overcome the slow strength evolution of CaO activated slag binders. Setting time, compressive strength, hydration products and microstructure were systemically studied. The research work has brought about a discovery that the properties of CaO activated slag was influenced significantly in the presence of Na₂SO₄. Adding 1% Na₂SO₄ enhanced the compressive strength of the binders at all curing ages with the pore structure refinement. The authors attributed the beneficial effects to the accelerated reaction of slag and the additional ettringite (AFt) formation, which was confirmed by the XRD, FTIR and TGA analysis. While increasing the Na₂SO₄ content, although the early compressive strength was enhanced, decreased the compressive strength at the later curing periods.

考虑到相对较低的碳排放量，碱活化材料（AAMs）有望成为普通波特兰水泥（OPC）的候选材料。在目前的工作中，作者研究了硫酸钠（Na ₂ SO ₄）含量对石灰（CaO）活性矿渣性能的影响，以克服CaO活性矿渣粘结剂的缓慢强度演变。系统地研究了凝固时间，抗压强度，水合产物和微观结构。研究工作带来了一个发现，即在Na ₂ SO ₄的存在下，CaO活化炉渣的性能受到显着影响。添加1％Na ₂ SO ₄通过细化孔结构，提高了在所有固化年龄下粘合剂的抗压强度。作者归因于炉渣的加速反应和附加钙矾石（AFt）形成的有益作用，这已通过XRD，FTIR和TGA分析得到证实。在增加Na ₂ SO ₄含量的同时，虽然提高了早期的抗压强度，但在后期的固化阶段却降低了其抗压强度。