Study on corrosion resistance and microstructure of modified sediment geopolymer materials

IF 7.1 3区材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY

Materials Today Sustainability Pub Date : 2024-11-15 DOI:10.1016/j.mtsust.2024.101048

Changming Li , Huilin Liu , Xiaoxiong Chai , Dongyang Jia , Yaozong Wang , Hui Liu , Xudong Yang , Guanfeng Liu , Wanjiao Li

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引用次数: 0

Abstract

Utilizing sediment to manufacture geopolymer materials by alkali-activated modification is an eco-friendly and economical strategy. Investigating its corrosion resistance properties is crucial for enhancing the durability and structural stability of the materials and is the key to promoting their widespread application. In this paper, the combined effects of modifiers, mineral admixtures, and corrosion conditions on the corrosion resistance, mechanical strength, and microstructure of modified sediment geopolymer materials were thoroughly investigated. The mechanical properties of materials were evaluated by universal press, and the mineral composition and microstructure of the materials were analyzed by XRD, SEM and TG. The results reveal that the strength of the modified sediment material are significantly improved. The highest compressive strength of the modified sediment samples reached 15.84 MPa, which was much higher than that of the modified sediment samples without additives. The optimum softening coefficient of the sample is 0.79, and its water resistance is exceptional. The highest compressive strength reaches 15.04 MPa and 14.43 MPa respectively in acid and alkali environment, and its corrosion resistance is better than that of sediment materials without additives. The microstructure analyzed clearly indicated that the C–S–H gels, as the main hydration products, effectively promoted the close bonding of the sediment particles and filled the pores and microcracks inside the specimens, which significantly enhanced the strength and corrosion resistance of the material.

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改性沉积土工聚合物材料的耐腐蚀性和微观结构研究

利用沉积物通过碱活化改性来制造土工聚合物材料是一种既环保又经济的策略。研究其耐腐蚀性能对于提高材料的耐久性和结构稳定性至关重要，也是促进其广泛应用的关键。本文深入研究了改性剂、矿物掺合料和腐蚀条件对改性沉积土工聚合物材料的耐腐蚀性、机械强度和微观结构的综合影响。采用万能压机对材料的力学性能进行了评价，并通过 XRD、SEM 和 TG 分析了材料的矿物成分和微观结构。结果表明，改性沉积物材料的强度明显提高。改性沉积物样品的最高抗压强度达到 15.84 兆帕，远高于未添加添加剂的改性沉积物样品。样品的最佳软化系数为 0.79，耐水性能优异。在酸碱环境中的最高抗压强度分别达到 15.04 兆帕和 14.43 兆帕，其耐腐蚀性能优于不含添加剂的沉积物材料。微观结构分析表明，C-S-H 凝胶作为主要的水化产物，有效地促进了沉积物颗粒的紧密结合，填充了试样内部的孔隙和微裂缝，显著提高了材料的强度和耐腐蚀性能。

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来源期刊

Materials Today Sustainability Multiple-

CiteScore

5.80

自引率

6.40%

发文量

174

审稿时长

32 days

期刊介绍： Materials Today Sustainability is a multi-disciplinary journal covering all aspects of sustainability through materials science. With a rapidly increasing population with growing demands, materials science has emerged as a critical discipline toward protecting of the environment and ensuring the long term survival of future generations.