杨雷,刘卓,罗树琼,等. 萘系高效减水剂对赤泥基胶凝材料性能的影响机理[J].河南理工大学学报(自然科学版)，doi:10.16186/j.cnki.1673-9787.2024010056.

YANG L, LIU Z, LUO S Q, et al． Mechanism of the effect of naphthalene-based high efficient water reducing agent on the properties of red mud-based cementitious materials [J]. Journal of Henan Polytechnic University( Natural Science) ， doi: 10.16186/j.cnki.1673-9787.2024010056.

萘系高效减水剂对赤泥基胶凝材料性能的影响机理(网络首发)

杨雷^{1, 2}，刘卓^{1, 2}，罗树琼^{1, 2}，谢玉芬^1,2

1.河南理工大学 材料科学与工程学院,河南 焦作 454000；2.河南理工大学 河南省深地材料科学与技术重点实验室,河南 焦作 454000

摘要: 目的 由于赤泥存在颗粒细小、吸水率高等问题，掺入会明显降低水泥混凝土的流动性和力学性能，已有人将萘系高效减水剂（NSF）应用于赤泥基胶凝材料中，研究其影响规律，但其作用机理有待进一步明晰。 方法 本文以NSF作为外加剂，开展了NSF对不同赤泥掺量的赤泥-水泥浆体流变性能、硬化性能以及微观结构的影响实验，分析其对赤泥-水泥浆体物理、化学性能的影响规律。结果 结果表明：在NSF饱和掺量为0.5%的条件下，掺入NSF提高了浆体的流动度、有效降低了其30，60 min时的经时损失，同时，也降低了塑性粘度与剪切应力，提高了赤泥-水泥颗粒的分散性。当赤泥掺量为0%、25%，掺入NSF的赤泥-水泥浆体1，3，7，28 d强度比未掺NSF高，这是因为掺入的NSF对C₂S和C₃S的水化反应均有促进作用。未掺、掺入NSF的赤泥-水泥浆体中C-S-H分别为纤维状和网状，氢氧化钙（Ca(OH)₂）为片状，但掺入NSF的赤泥-水泥浆体的Ca(OH)₂分布更均匀；当赤泥掺量为50%时，会对浆体的强度产生负面影响，这可能是由于大掺量的赤泥会使浆体碱性过高，NSF作用于高碱性溶液时，其自身不稳定造成的。结论 本文结果将为赤泥基胶凝材料性能的提升提供一定理论指导。

关键词: 赤泥基胶凝材料；萘系高效减水剂；流变性能；作用机理

doi: 10.16186/j.cnki.1673-9787.2024010056

基金项目: 国家自然科学基金项目(52278256)；宁波市科技创新2025重大专项(2020Z040)；河南理工大学博士基金项目(B2021-15)；2023年河南理工大学创新型科研团队资助项目(T2023-5)

收稿日期：2024-01-24

修回日期：2024-02-29

网络首发日期：2025-12-11

Mechanism of the effect of naphthalene-based high efficient water reducing agent on the properties of red mud-based cementitious materials (Online)

YANG Lei^{1, 2}, LIU Zhuo^{1, 2}, LUO Shuqiong^{1, 2}, Xie Yufen^{1, 2}

1. School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China；2. Henan Key Laboratory of Materials on Deep-Earth Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China

Abstract: Objectives Red mud has the issue of high water absorption due to its fine particles, so its incorporation will significantly reduce the fluidity and mechanical properties of cement concrete. Some researchers have applied Naphthalene-based high-efficiency water reducing agent (NSF) to red mud based cementitious materials to study its influential rule, buts action mechanism requires to be further clarified. Methods NSF was used as an admixture, experiments on the effects of NSF on the rheological properties, hardening properties and microstructure of red mud-cement pastes with different dosages of red mud were carried out, and mechanism on the effects of NSF on the physical and chemical properties of red mud-cement pastes was revealed. Results Results show that, under the condition of 0.5% NSF saturated doping, the incorporation of NSF improved the fluidity of the slurry, effectively reduced its slump loss at 30 and 60 min, and at the same time, it also reduced the plastic viscosity and shear stress, and improved the dispersion of the red mud-cement particles. When the content of red mud was 0% and 25%,the compressive strength of red mud-cement slurry with NSF was higher than that of samples without NSF at 1, 3, 7 and 28 d, This is because the blending of NSF promotes the hydration reaction of both C₂S and C₃S. The C-S-H in all samples was fibrous and reticulated, and the calcium hydroxide (Ca(OH)₂) was in the form of flakes, . Comparatively, the distribution of Ca(OH)₂ was more homogeneous in the samples with NSF. When the content of red mud was 50%, it will have a negative impact on the strength of the slurry, which may be caused by the high alkalinity of the slurry due to the large dosage of red mud, and the instability of NSF when it acts on the highly alkaline solution. Conclusions These results will provide theoretical guidance for the improvement of the properties of red mud based cementitious materials.

Key words: red mud based cementitious material; naphthalene high efficient water reducing agent; rheological properties; action mechanism