Department of Civil Engineering, Najran University, Najran, Saudi Arabia.
Department of Civil Engineering, Swedish College of Engineering and Technology, Wah Cantt, Pakistan.
PLoS One. 2023 Apr 20;18(4):e0282435. doi: 10.1371/journal.pone.0282435. eCollection 2023.
Because of the recent progress in materials properties, specifically high-strength concrete, further research is needed to evaluate its suitability, understanding, and performance in the modern-day world. This research aims to enhance the performance of ultra-high-strength geopolymer concrete (UHS-GPC) by adding nano-silica (NS) and polypropylene fibers (PPFs). Three 1%, 2%, and 3% different amounts of PPFs and three NS 5%, 10%, and 15% were utilized in the samples. Various performance parameters of UHS-GPC were evaluated, such as fresh property, compressive strength, modulus of elasticity split tensile, flexural and bonding strength, drying shrinkage, load-displacement test, fracture performance, and elevated temperature. The test outcomes showed that by raising the percentage of PPFs and NS to the allowable limit, the performance of UHS-GPC can be improved significantly. The most improved performance of UHS-GPC was obtained at 2% polypropylene fibers and 10% nano-silica, as the compressive, splitting tensile, flexural. Bond strength was improved by 17.07%, 47.1%, 36.52, and 37.58%, and the modulus of elasticity increased by 31.4% at 56 days. The study showed that the sample with 2% PPFs and 10% NS had excellent performance in the load-displacement test, drying shrinkage, fracture behavior, and elevated temperature. At 750°C elevated temperature, the samples' strength was reduced drastically, but at 250°C, the modified samples showed good resistance to heat by retaining their compressive strength to some degree. The present work showed the suitability of PPFs and NS to develop ultra-high-strength geopolymer concrete, which can be used as a possible alternate material for Portland cement-based concrete.
由于材料性能的最新进展，特别是高强度混凝土，需要进一步研究以评估其在现代世界中的适用性、理解和性能。本研究旨在通过添加纳米二氧化硅 (NS) 和聚丙烯纤维 (PPF) 来提高超高强度地聚合物混凝土 (UHS-GPC) 的性能。在样品中使用了三种不同量的 1%、2%和 3%的 PPF 和三种 NS 5%、10%和 15%。评估了 UHS-GPC 的各种性能参数，如新鲜性能、抗压强度、弹性模量劈裂拉伸、弯曲和粘结强度、干燥收缩、荷载-位移试验、断裂性能和高温。试验结果表明，通过将 PPF 和 NS 的百分比提高到允许的极限，可以显著提高 UHS-GPC 的性能。UHS-GPC 性能提高最显著的是在 2%聚丙烯纤维和 10%纳米二氧化硅时，抗压强度、劈裂拉伸强度、弯曲强度和粘结强度分别提高了 17.07%、47.1%、36.52%和 37.58%，弹性模量在 56 天时提高了 31.4%。研究表明，在荷载-位移试验、干燥收缩、断裂行为和高温下，含有 2% PPF 和 10% NS 的样品具有优异的性能。在 750°C 的高温下，样品的强度急剧下降，但在 250°C 时，改性样品表现出良好的耐热性，在一定程度上保留了其抗压强度。本工作表明 PPF 和 NS 适合开发超高强度地聚合物混凝土，可作为波特兰水泥基混凝土的替代材料。
