马川义, 于婷婷, 张宁, 李召峰, 张健. 拜耳赤泥基泡沫轻质土流变特性及其调控方法[J]. 工程科学学报, 2024, 46(10): 1912-1920. DOI: 10.13374/j.issn2095-9389.2023.02.04.003
引用本文: 马川义, 于婷婷, 张宁, 李召峰, 张健. 拜耳赤泥基泡沫轻质土流变特性及其调控方法[J]. 工程科学学报, 2024, 46(10): 1912-1920. DOI: 10.13374/j.issn2095-9389.2023.02.04.003
MA Chuanyi, YU Tingting, ZHANG Ning, LI Zhaofeng, ZHANG Jian. Study on rheological properties and regulation of Bayer red mud-based foamed lightweight soil[J]. Chinese Journal of Engineering, 2024, 46(10): 1912-1920. DOI: 10.13374/j.issn2095-9389.2023.02.04.003
Citation: MA Chuanyi, YU Tingting, ZHANG Ning, LI Zhaofeng, ZHANG Jian. Study on rheological properties and regulation of Bayer red mud-based foamed lightweight soil[J]. Chinese Journal of Engineering, 2024, 46(10): 1912-1920. DOI: 10.13374/j.issn2095-9389.2023.02.04.003

拜耳赤泥基泡沫轻质土流变特性及其调控方法

Study on rheological properties and regulation of Bayer red mud-based foamed lightweight soil

  • 摘要: 泡沫轻质土因其轻质、高强、流动性好、施工效率高的优点成为解决交通领域不均匀沉降等路基病害问题的有效材料. 拜耳赤泥替代水泥制备成为赤泥基泡沫轻质土并应用于交通工程建设中,可获得巨大的工程价值和生态效益. 本研究针对赤泥基泡沫轻质土工程适用性问题,开展了赤泥基泡沫轻质土流变性能调控方法研究,揭示了水胶比、减水剂对赤泥基泡沫轻质土流变特性、抗压强度的作用规律. 试验表明,萘系减水剂对改善新拌浆液流动性能最为显著,水胶比0.5~0.6的流动度介于165~212 mm有利于现场浇筑;掺杂质量分数0.3%的萘系减水剂在水胶比0.5时可将流动度由165 mm增加至176 mm. 水胶比的增加使抗压强度呈现先升高后降低的趋势,聚羧酸减水剂对抗压强度具有削弱作用,而萘系减水剂可提升抗压强度,最终确定了水胶比和减水剂的最佳设计值.

     

    Abstract: Foamed lightweight soil has become an effective material to solve subgrade problems such as uneven settlement in the traffic field because of its advantages of light weight, high strength, good fluidity, and high construction efficiency. The traditionally foamed lightweight soil is mainly made of cement prepared by foaming. With a strong transportation network, carbon peaking, and carbon neutrality, foamed lightweight soil prepared using industrial solid wastes instead of cement has gradually become a research hotspot. Bayer red mud is one of the industrial solid wastes that are most difficult to reuse. Guided by the resource utilization of industrial wastes and the demand for green construction of traffic engineering, this study proposes to use Bayer red mud instead of cement to prepare foamed lightweight soil, and its application in traffic engineering construction has huge engineering value and ecological benefits. Aiming at the problems in the engineering application of red mud-based foamed lightweight soil, this study examined the regulation methods of the rheological properties of red mud-based foamed lightweight soil and revealed the effects of the water–binder ratio and superplasticizers on rheological properties and compressive strength of red mud-based foamed lightweight soil. The optimal water–binder ratio and optimal type and dosage of superplasticizers were determined, and the dynamic control of the performance of red mud-based foamed lightweight soil was realized. In this study, naphthalene superplasticizers significantly improved the fluidity of fresh slurry. The fluidity of the slurry increased with the increase in the water–binder ratio; when the water–binder ratio is <0.5 or >0.6, the fluidity of the slurry is too thick or watery. When the water–binder ratio is 0.5–0.6, the fluidity is between 165 and 212 mm, which is beneficial for construction. Both polycarboxylate and naphthalene superplasticizers can increase the fluidity of slurry. Naphthalene superplasticizers can increase the fluidity of slurry more remarkably, and the fluidity of 0.3% naphthalene superplasticizers increased from 165 to 176 mm when the water–binder ratio was 0.5. If the water–binder ratio is increased, the compressive strength first increases and then decreases. Polycarboxylate superplasticizers can weaken the compressive strength, whereas naphthalene superplasticizers can improve the compressive strength. An infrared spectrogram analysis showed that geopolymer gel is the main hydration product of red mud-based foamed lightweight soil, naphthalene superplasticizers can promote geopolymerization and increase the amounts of hydration products, and the optimum design values of the water–binder ratio and superplasticizers are determined.

     

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