Chen Shanshi, Yue Xinjian, Zhou Yongmin
College of Materials Science and Engineering, Nanjing Tech University, South Puzhu Road No. 30, Nanjing 211816, China.
Materials (Basel). 2025 May 23;18(11):2453. doi: 10.3390/ma18112453.
The particle size of raw materials is crucial for clinker formation, ultimately affecting cement performance. However, the specific effects of the fineness of individual raw materials on clinker burnability remain insufficiently understood. In this study, the fineness of limestone, shale, and iron-bearing materials was systematically varied to explore its influence on raw meal burnability and the resulting cement properties. Raw materials were prepared with controlled residue levels (5-20%) retained on an 80 μm sieve. Their impact was evaluated based on free lime content (f-CaO), clinker phase composition, cement strength development, and hydration behavior. Among the variables studied, limestone fineness was found to be the predominant factor affecting f-CaO levels, confirming its dominant role in governing clinker burnability. In contrast, fineness adjustments of aluminosilicate and iron-bearing components produced comparatively minor effects. Despite variations in raw meal fineness, clinkers produced with sieve residues between 10% and 15% exhibited consistent phase compositions, primarily comprising tricalcium silicate (CS), dicalcium silicate (CS), tricalcium aluminate (CA), and tetracalcium aluminoferrite (CAF). Furthermore, cement pastes derived from these clinkers demonstrated similar setting times, mechanical strengths, and hydration product assemblages. These results highlight the robustness of cement performance with respect to moderate variations in raw material fineness, particularly when limestone fineness is adequately controlled.
原材料的粒度对熟料形成至关重要，最终会影响水泥性能。然而，对于单个原材料的细度对熟料易烧性的具体影响，人们仍了解不足。在本研究中，系统地改变了石灰石、页岩和含铁材料的细度，以探究其对生料易烧性及最终水泥性能的影响。制备的原材料在80μm筛网上的残留量（5 - 20%）可控。基于游离氧化钙含量（f - CaO）、熟料相组成、水泥强度发展和水化行为对其影响进行了评估。在所研究的变量中，发现石灰石细度是影响f - CaO水平的主要因素，证实了其在控制熟料易烧性方面的主导作用。相比之下，铝硅酸盐和含铁组分细度的调整产生的影响相对较小。尽管生料细度有所变化，但筛余在10%至15%之间生产的熟料具有一致的相组成，主要包括硅酸三钙（CS）、硅酸二钙（CS）、铝酸三钙（CA）和铁铝酸四钙（CAF）。此外，由这些熟料制成的水泥浆体表现出相似的凝结时间、机械强度和水化产物组合。这些结果突出了水泥性能对于原材料细度适度变化的稳健性，特别是当石灰石细度得到充分控制时。
