Impact of high-magnesium limestone combined with ion doping on the mineralogical characteristics and properties of cement clinker

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-05-08 DOI:10.1016/j.conbuildmat.2025.141606

Zhuqing Yu , Chao Zhu , Tao Lu , Tianyu Meng , Yinuo Liu , Liwu Mo

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引用次数: 0

Abstract

The scarcity of high-grade raw materials in conventional cement manufacturing has necessitated the utilization of alternative sources, such as low-grade minerals and industrial by products. This study systematically investigates the production of portland cement (PC) clinker and calcium sulfoaluminate cement (CSA) clinker through incorporation of high-magnesium limestone (HMLS) and industrial wastes (iron ore tailings, fly ash, etc.). Ion doping techniques were applied to optimize clinker performance, aiming to establish a sustainable pathway for low-value feedstock utilization. Some experiments were carried out, such as burnability, mineralogical composition, hydration heat, chemical shrinkage, hydration products, and compressive strength. For PC clinker synthesis, blending 25 wt% HMLS1 with 2.5 wt% IOT achieved clinker meeting industrial standards (MgO < 5 wt%). Fluorine and sulfur additives further suppressed MgO crystallization while enhancing clinker performance. Notably, IOT1 demonstrated superior compatibility with HMLS1 compared to IOT2, with calcium fluoride proving critical in facilitating calcination when paired with IOT2. In CSA clinker production, formulations containing 30 wt% HMLS2 and 1 wt% FA yielded qualified clinker. Additional incorporation broax (0.5 % of raw meal mass) effectively mitigates MgO-induced hydration instability by promoting ye'elimite (C₄A₃$) crystallization and stabilizing dicalcium silicate (C₂S), thereby increasing compressive strength by 30 % compared to undoped controls in 7 days. Phase evolution analysis revealed borax-mediated transitions from C₄A₃$-C to C₄A₃$-O and β-C₂S to α-C₂S. These findings offer technical insights for eco-efficient cement production.

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高镁石灰石复合离子掺杂对水泥熟料矿物学特征和性能的影响

由于传统水泥制造中缺乏高级原料，因此必须利用其他来源，例如低等级矿物和工业副产品。本研究系统考察了高镁石灰石（HMLS）与工业废渣（铁矿尾矿、粉煤灰等）掺入生产硅酸盐水泥（PC）熟料和硫铝酸钙水泥（CSA）熟料的工艺。采用离子掺杂技术优化熟料性能，建立低价值原料可持续利用途径。进行了可燃性、矿物组成、水化热、化学收缩率、水化产物、抗压强度等试验。对于PC熟料的合成，将25 wt% HMLS1与2.5 wt% IOT混合，获得了符合工业标准的熟料(MgO <；5 wt %)。氟和硫添加剂进一步抑制了MgO结晶，提高了熟料性能。值得注意的是，与IOT2相比，IOT1与HMLS1表现出更好的相容性，氟化钙与IOT2配对时对促进煅烧至关重要。在CSA熟料生产中，含有30 wt% HMLS2和1 wt% FA的配方生产出合格的熟料。添加硼砂（生料质量的0.5% %）通过促进极限（C4A3$）结晶和稳定硅酸二钙（C2S），有效减轻了氧化镁引起的水化不稳定性，从而在7天内比未添加的对照提高了30% %的抗压强度。相演化分析显示硼砂介导的从C4A3$-C到C4A3$-O和从β-C2S到α-C2S的转变。这些发现为生态高效水泥生产提供了技术见解。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.