玻璃纤维增强复合材料（Glass Fiber Reinforced Plastic，GFRP）凭借高强度、耐腐蚀和绝缘性好等优异性能，在建筑、交通、风电等领域被广泛应用，但在其生产和使用过程中产生大量的边角料和服役期满的GFRP废弃物，已成为亟待解决的环境与资源问题。GFRP再生料中的玻璃纤维粉体作为一种典型的硅铝质材料，具有潜在的反应活性，经过一定工艺处理后有望成为水泥的替代材料。为了提高再生玻璃纤维粉体的反应活性，从而提高其在混凝土的替代量。本文通过改变GFRP热处理回收工艺对再生玻璃纤维粉体的反应活性进行了调控，研究了热处理工艺对再生玻璃纤维粉体结构和反应活性的影响。选用活性较高的一种再生玻璃纤维粉体按不同量替代水泥制备了混凝土，并对该混凝土拌合物的坍落度与扩展度以及混凝土的抗压强度、耐磨性能、抗渗性能和抗冻性能等进行了系统而深入的研究。为GFRP废弃物的资源化利用提供了理论依据与技术路径，对推动绿色建材发展具有重要意义。本文主要结论如下：

（1）随着热处理温度的升高和热处理时间的延长，再生玻璃纤维的直径逐渐收缩，SiO₂的晶体结构发生了转变，结晶度逐渐变高；再生玻璃纤维粉体主要由O、Si、Ca、Mg、Al五种元素组成，且这五种元素在其表面均匀分布不存在成分差异，Al元素和Si元素主要以硅氧四面体[SiO₄]^4-和铝氧四面体[AlO₄]^5-的形式存在，少量以氧化物的形式存在。

（2）再生玻璃纤维粉体在碱溶液中Si元素和Al元素的溶出量与热处理温度和热处理时间以及碱溶液浓度有关。其随热处理温度升高和热处理时间延长呈现出逐渐降低的趋势，增加碱溶液浓度有助于提升Si元素和Al元素的溶出量。再生玻璃纤维粉体对砂浆强度的贡献不仅取决于其表面活性SiO₂和活性Al₂O₃的含量，还与再生纤维粉体的物理填充作用和短棒状再生玻璃纤维粉体的桥接作用有关。600 ℃下热处理1.0 h得到的再生玻璃纤维粉体对砂浆强度提升最大，相较于基准砂浆，其28 d抗折强度和抗压强度分别提升了20.90%、27.34%。

（3）再生玻璃纤维粉体替代量增加会导致混凝土拌合物的坍落度与扩展度出现下降的趋势，替代量为50 kg/m³时会出现上升的现象。替代量为30 kg/m³及以下时，混凝土各项性能明显改善；替代量在50 kg/m³及以上时，混凝土的各项性能开始明显下降；替代量为70 kg/m³时，除耐磨性能略高于基准混凝土外，其余性能均劣于基准混凝土。综合混凝土性能与环境因素考虑，再生玻璃纤维粉体的最大替代量为50 kg/m³。

Glass Fiber Reinforced Plastic (GFRP) is widely used in construction, transportation, wind power and other fields due to its excellent properties such as high strength, corrosion resistance, and good insulation. However, a large amount of scraps and end-of-life GFRP waste generated during its production and use has become an urgent environmental and resource issue. As a typical siliceous-aluminous material, the glass fiber powder in GFRP recycled materials has potential reactive activity and is expected to become a substitute for cement after certain process treatments. To enhance the reactive activity of recycled glass fiber powder and thereby increase its substitution ratio in concrete, this study regulated the reactive activity of recycled glass fiber powder by altering the heat treatment recycling process of GFRP, and investigated the effects of heat treatment processes on the structure and reactive activity of the powder. A highly active recycled glass fiber powder was selected to prepare concrete by replacing cement in different contents. Systematic and in-depth studies were conducted on the slump and spread of the concrete mixture, as well as the compressive strength, abrasion resistance, impermeability, and freeze-thaw resistance of the concrete. This provides a theoretical basis and technical path for the resource utilization of GFRP waste, and is of great significance for promoting the development of green building materials. The main conclusions of this paper are as follows:

(1) With the increase in heat treatment temperature and the prolongation of heat treatment time, the diameter of recycled glass fibers gradually shrinks, the crystal structure of SiO₂ transforms, and the crystallinity gradually increases. The recycled glass fiber powder is primarily composed of five elements: O, Si, Ca, Mg, and Al, which are uniformly distributed on its surface without compositional differences. Aluminum and silicon elements mainly exist in the form of silicate tetrahedrons [SiO₄]⁴⁻ and aluminate tetrahedrons [AlO₄]⁵⁻, with a small amount existing as oxides.

(2) The dissolution amount of Si and Al elements from recycled glass fiber powder in alkaline solution is related to heat treatment temperature, heat treatment time, and alkaline solution concentration. It shows a gradual decreasing trend with the increase in heat treatment temperature and time, while increasing the alkaline solution concentration helps to enhance the dissolution of Si and Al elements. The contribution of recycled glass fiber powder to mortar strength depends not only on the content of surface-active SiO₂ and active Al₂O₃ but also on the physical filling effect of the powder and the bridging effect of short rod-shaped recycled glass fibers. The recycled glass fiber powder obtained by heat treatment at 600 ℃ for 1.0 h has the greatest improvement on the mortar strength. Compared with the reference mortar, its 28-day flexural strength and compressive strength are increased by 20.90% and 27.34% respectively.

(3) An increase in the substitution amount of recycled glass fiber powder leads to a downward trend in the slump and spread of concrete, with an upward trend observed at a substitution amount of 50 kg/m³. When the substitution amount is 30 kg/m³ or lower, the various properties of the concrete are significantly improved; when it is 50 kg/m³ or higher, the properties begin to decline significantly. At 70 kg/m³, except for slightly higher wear resistance than the reference concrete, all other properties are inferior. Considering the comprehensive performance of concrete and environmental factors, the maximum substitution amount of recycled glass fiber powder is 50 kg/m³.

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