Keshta Mostafa M, Yousry Elshikh Mohamed M, Youssf Osama
Structural Engineering Department, Mansoura University, Mansoura, Egypt.
Sci Rep. 2025 Jul 1;15(1):20646. doi: 10.1038/s41598-025-06883-0.
In recent decades, concerns about the high cement consumption and its associated carbon footprint have prompted significant efforts in the construction sector to incorporate alternative materials into cementitious composites. This study focused on the development of a sustainable approach to produce high strength fiber reinforced cementitious mortar (HS-FRCM) and high strength fiber reinforced geopolymer mortar (HS-FRGM). The proposed mortars incorporate volcanic ash (VA) as partial replacements for conventional components, with substitution levels of up to 80%. Furthermore, magnetized water (MW) was utilized as the mixing water in producing both HS-FRCM and HS-FRGM, replacing tap water (TW) for sustainable mortars. Four different curing conditions were used; tap water, seawater, air, and sunlight. The slump values, mechanical performance, durability, and microstructural were conducted and analyzed. The results indicated that VA significantly enhanced HS-FRCM workability by up to 150%, while it had a less pronounced effect on HS-FRGM workability. When 20% VA was used, the 28-day compressive strength of HS-FRCM was not affected, but the compressive strength of HS-FRGM decreased by only 6%. The highest compressive strength was recorded for both HS-FRCM and HS-FRGM when cured in tap water, compared to other conditions of curing. Utilizing MW improved HS-FRCM and HS-FRGM workability by up to 100%, and the compressive strengths increased by as much as 15%. The microstructural analyses revealed that the use of MW resulted in a denser structure with a stronger bond between the fibers and the matrix, as well as fewer microcracks and pores, compared to mixtures prepared with TW. Fourier-transform infrared (FTIR) spectroscopy indicated the effectiveness of using VA and MW in enhancing hydration process.
近几十年来，对高水泥消耗量及其相关碳足迹的担忧促使建筑行业做出了巨大努力，将替代材料纳入水泥基复合材料中。本研究聚焦于开发一种可持续的方法来生产高强度纤维增强水泥砂浆（HS-FRCM）和高强度纤维增强地质聚合物砂浆（HS-FRGM）。所提出的砂浆采用火山灰（VA）作为传统组分的部分替代品，替代水平高达80%。此外，磁化水（MW）被用作生产HS-FRCM和HS-FRGM的拌合水，以替代自来水（TW）来制备可持续砂浆。使用了四种不同的养护条件：自来水、海水、空气和阳光。对坍落度值、力学性能、耐久性和微观结构进行了测试和分析。结果表明，VA显著提高了HS-FRCM的工作性，提高幅度高达150%，而对HS-FRGM工作性的影响则不太明显。当使用20%的VA时，HS-FRCM的28天抗压强度不受影响，但HS-FRGM的抗压强度仅下降了6%。与其他养护条件相比，在自来水中养护时，HS-FRCM和HS-FRGM的抗压强度均达到最高。使用MW使HS-FRCM和HS-FRGM的工作性提高了100%，抗压强度提高了15%。微观结构分析表明，与用TW制备的混合物相比，使用MW导致结构更致密，纤维与基体之间的粘结更强，微裂纹和孔隙更少。傅里叶变换红外（FTIR）光谱表明使用VA和MW对增强水化过程的有效性。
