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Evaluating the impact of nano-silica on characteristics of self-compacting geopolymer concrete with waste tire steel fiber
Archives of Civil and Mechanical Engineering ( IF 4.4 ) Pub Date : 2022-12-20 , DOI: 10.1007/s43452-022-00587-2
Fadi Althoey , Osama Zaid , Fahad Alsharari , Ahmed. M. Yosri , Haytham F. Isleem

The demand for cement-free concrete is increasing worldwide to make the construction industry closer to being sustainable. The current research’s main objective was to develop self-compacting fiber-reinforced geopolymer concrete using waste/recycled materials. Steel wire from an old discarded tire was cut to make steel fibers. Wheat straw ash, an agricultural waste material, was utilized as the primary binder, and alkali-activated solutions were used as the precursors. Further, nano-silica (NS) was added from 0.5 to 3.0%, and waste tire steel fibers (WTSF) were added from 1 to 3.5% by binder content in different mixes. To evaluate the characteristics of different concrete, tests were performed, such as compressive, split tensile, and flexural strength for mechanical properties and sorptivity, rapid chloride penetration (RCP), and drying shrinkage tests for durability properties. It was noted that at 2.5% NS and 3.0% WTSF, the strength increases as 71.5, 6.5, and 8.2 MPa strength was achieved at 90 days for compressive, split tensile and flexural strength. For the RCP test, all samples were categorized as “low” in electrical conductance, micro-strains for drying shrinkage all came in an acceptable range for all samples, and sorptivity values were higher in earlier curing phases than in later phases of concrete. To understand the phase analysis of concrete, x-ray diffraction (XRD) analysis was performed, and it was revealed that the M5 mix (2.5% NS + 3.0% WTSF) had the highest peaks of C-S-H, N-A-S-H, and C-A-S-H, which demonstrates the densified microstructure of concrete with addition of nano-silica.



中文翻译:

评价纳米二氧化硅对废轮胎钢纤维自密实地聚物混凝土特性的影响

全球对无水泥混凝土的需求不断增加,使建筑行业更接近可持续发展。当前研究的主要目标是使用废料/回收材料开发自密实纤维增强地质聚合物混凝土。将废弃旧轮胎上的钢丝切割成钢纤维。小麦秸秆灰是一种农业废料,被用作主要粘合剂,碱激活溶液被用作前体。此外,纳米二氧化硅 (NS) 的添加量为 0.5% 至 3.0%,废轮胎钢纤维 (WTSF) 的添加量为 1% 至 3.5%(按不同混合物中的粘合剂含量计)。为了评估不同混凝土的特性,进行了抗压、劈裂抗拉和弯曲强度等机械性能和吸水性、快速氯化物渗透 (RCP)、耐久性的干燥收缩试验。值得注意的是,在 2.5% NS 和 3.0% WTSF 的情况下,在 90 天时的压缩强度、劈裂拉伸强度和弯曲强度分别达到 71.5、6.5 和 8.2 MPa。对于 RCP 测试,所有样品的电导率都被归类为“低”,所有样品的干燥收缩微应变都在可接受的范围内,并且混凝土早期养护阶段的吸附率值高于混凝土后期阶段。为了了解混凝土的相分析,进行了 X 射线衍射 (XRD) 分析,结果表明 M5 混合物(2.5% NS + 3.0% WTSF)具有最高的 CSH、NASH 和 CASH 峰,这表明添加纳米二氧化硅的混凝土的致密微观结构。0% WTSF,强度增加,在 90 天时达到 71.5、6.5 和 8.2 MPa 的压缩强度、劈裂拉伸强度和弯曲强度。对于 RCP 测试,所有样品的电导率都被归类为“低”,所有样品的干燥收缩微应变都在可接受的范围内,并且混凝土早期养护阶段的吸附率值高于混凝土后期阶段。为了了解混凝土的相分析,进行了 X 射线衍射 (XRD) 分析,结果表明 M5 混合物(2.5% NS + 3.0% WTSF)具有最高的 CSH、NASH 和 CASH 峰,这表明添加纳米二氧化硅的混凝土的致密微观结构。0% WTSF,强度增加,在 90 天时达到 71.5、6.5 和 8.2 MPa 的压缩强度、劈裂拉伸强度和弯曲强度。对于 RCP 测试,所有样品的电导率都被归类为“低”,所有样品的干燥收缩微应变都在可接受的范围内,并且混凝土早期养护阶段的吸附率值高于混凝土后期阶段。为了了解混凝土的相分析,进行了 X 射线衍射 (XRD) 分析,结果表明 M5 混合物(2.5% NS + 3.0% WTSF)具有最高的 CSH、NASH 和 CASH 峰,这表明添加纳米二氧化硅的混凝土的致密微观结构。对于 RCP 测试,所有样品的电导率都被归类为“低”,所有样品的干燥收缩微应变都在可接受的范围内,并且混凝土早期养护阶段的吸附率值高于混凝土后期阶段。为了了解混凝土的相分析,进行了 X 射线衍射 (XRD) 分析,结果表明 M5 混合物(2.5% NS + 3.0% WTSF)具有最高的 CSH、NASH 和 CASH 峰,这表明添加纳米二氧化硅的混凝土的致密微观结构。对于 RCP 测试,所有样品的电导率都被归类为“低”,所有样品的干燥收缩微应变都在可接受的范围内,并且混凝土早期养护阶段的吸附率值高于混凝土后期阶段。为了了解混凝土的相分析,进行了 X 射线衍射 (XRD) 分析,结果表明 M5 混合物(2.5% NS + 3.0% WTSF)具有最高的 CSH、NASH 和 CASH 峰,这表明添加纳米二氧化硅的混凝土的致密微观结构。

更新日期:2022-12-20
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