Ahıskalı Adem, Bayrak Barış, Toklu Kenan, Bayraktar Oğuzhan Yavuz, Kaplan Gökhan, Aydın Abdulkadir Cüneyt
Department of Civil Engineering, Kastamonu University, 37150 Kastamonu, Turkey.
Department of Civil Engineering, Kafkas University, 36100 Kars, Turkey.
ACS Omega. 2025 May 14;10(20):20193-20212. doi: 10.1021/acsomega.4c10738. eCollection 2025 May 27.
This study aims to investigate the mechanical, physical, durability and microstructure of slag-based and environmentally friendly foam geopolymer concrete with glass and polypropylene fiber hybridization using sustainable materials such as waste marble dust, silica fume (SF) and sodium metasilicate. One of the most critical advantages of geopolymer concrete compared to traditional Portland cement is its low carbon emissions. In the study, foam geopolymer concrete was produced using glass fiber (GF) and polypropylene fiber (PPF) additives and three different silica fume ratios (0%, 7.5%, 15%) and the effects of these additives on the workability (flow diameter), transfer performance (sorptivity), compressive strength, flexural strength, thermal conductivity, high-temperature performance and freeze-thaw resistance were investigated. The experimental results showed that the hybridization of GF and PPF significantly increased the compressive strength and flexural strength of samples without silica fume. However, high silica fume content negatively affected the mechanical properties by creating voids in the matrix. The flexural performance of geopolymer foams was significantly improved by fiber reinforcement. Mainly, improvements were observed in both peak load and displacement values of hybrid fiber geopolymer foams. In addition, GF and PPF admixtures increased the strength of concrete, especially after high temperatures of 200 and 400 °C. However, the compressive strength of samples exposed to high temperatures of 600 °C decreased. It was determined that the hybridization of GF and PPF increased the thermal insulation performance of foam geopolymer concrete. SEM analyses revealed that silica fume and fiber additives significantly affected the microstructure and mechanical strength of geopolymer foams. This study highlights that waste marble powder has the potential to be utilized in environmentally friendly geopolymer concrete and that the use of SF, GF and PPF additives at optimum rates is essential for the performance of foam geopolymer concrete.
本研究旨在利用废弃大理石粉、硅灰（SF）和偏硅酸钠等可持续材料，研究玻璃纤维和聚丙烯纤维混杂的矿渣基环保泡沫地质聚合物混凝土的力学性能、物理性能、耐久性和微观结构。与传统波特兰水泥相比，地质聚合物混凝土最关键的优势之一是其低碳排放量。在本研究中，使用玻璃纤维（GF）和聚丙烯纤维（PPF）添加剂以及三种不同的硅灰比例（0%、7.5%、15%）制备了泡沫地质聚合物混凝土，并研究了这些添加剂对工作性（流动直径）、传输性能（吸水性）、抗压强度、抗弯强度、导热系数、高温性能和抗冻融性的影响。实验结果表明，GF和PPF的混杂显著提高了无硅灰样品的抗压强度和抗弯强度。然而，高硅灰含量会在基体中产生孔隙，对力学性能产生负面影响。纤维增强显著改善了地质聚合物泡沫的抗弯性能。主要体现在混杂纤维地质聚合物泡沫的峰值荷载和位移值均有所提高。此外，GF和PPF外加剂提高了混凝土的强度，尤其是在200和400℃高温后。然而，暴露在600℃高温下的样品抗压强度下降。研究确定，GF和PPF的混杂提高了泡沫地质聚合物混凝土的保温性能。扫描电子显微镜分析表明，硅灰和纤维添加剂显著影响了地质聚合物泡沫的微观结构和力学强度。本研究强调，废弃大理石粉有潜力用于环保型地质聚合物混凝土，并且以最佳比例使用SF、GF和PPF添加剂对泡沫地质聚合物混凝土的性能至关重要。
