Use of Bagasse Ash as a Concrete Additive for Road Pavement Application

Corresponding data set for Tran-SET Project No. 18CLSU03. Abstract of the final report is stated below for reference: "The objective of this study was to evaluate the use of sugarcane bagasse ash (SCBA) as a partial replacement of cement in concrete for road pavement application. The study explored the pozzolanic activity of SCBA produced from three different processing methodologies (i.e., raw SCBA, controlled SCBA and post-processed SCBA). The experimental results revealed that SCBA produced by the controlled burning of sugarcane bagasse fiber (SBF) at 650°C and grinding (C-650), presented the maximum pozzolanic activity. However, this SCBA production process was deemed challenging for large-scale industrial application due to low SCBA yield (i.e., 3 to 6%). On the other hand, post-processing of raw SCBA, by burning at 450°C and grinding (P-450), produced a similar pozzolanic activity to that of SCBA C-650. Moreover, since post-processing of raw SCBA produced a significantly higher SCBA yield (i.e., 85 to 90%) than that of controlled burning of SBF, SCBA P-450 was selected for further investigation in concrete mixtures. The effect of different dosages of P-450 (i.e., 20, 30, and 40% cement replacement by weight) on concrete properties was evaluated. It was determined that concrete mixtures utilizing substitutions of 10% and 20% of cement with SCBA exhibited a similar compressive strength to that of control after 90 days of curing for Class-A and Class-B concretes, respectively. At higher levels of cement replacement, the compressive strength of concrete mixtures decreased proportionally at both, 28 and 90 days of curing; yet, the relative strength gain from 28 to 90 days increased. Furthermore, at 90 days of curing, surface resistivity of SCBA admixed concrete mixtures was superior to that of control for all cases. Finally, a cost analysis showed that a 10% cement replacement with SCBA in concrete could yield a reduction of per lane-mile cost of 0.75%."本数据集为Tran-SET项目编号18CLSU03的配套数据集。以下为该项目最终报告的摘要以供参考：“本研究旨在评估甘蔗渣灰（sugarcane bagasse ash, SCBA）作为部分替代材料，用于道路路面用混凝土的水泥替代可行性。本研究针对三种不同制备工艺制备的SCBA展开火山灰活性探究，分别为原生SCBA、受控制备SCBA与后处理SCBA。实验结果表明，通过在650℃下受控燃烧甘蔗渣纤维（sugarcane bagasse fiber, SBF）并辅以粉磨工艺得到的SCBA（标记为C-650），其火山灰活性最高。但该SCBA制备工艺的得率仅为3%~6%，难以满足大规模工业应用需求。与之相比，将原生SCBA在450℃下煅烧并粉磨得到的后处理SCBA（标记为P-450），其火山灰活性与C-650相当。此外，后处理工艺所得SCBA的得率可达85%~90%，远高于受控燃烧SBF的工艺，因此后续混凝土配合比试验均采用P-450开展研究。本研究评估了不同掺量的P-450（按重量计分别替代20%、30%与40%的水泥）对混凝土性能的影响。结果显示，在A类与B类混凝土中，分别以10%和20%的比例用SCBA替代水泥时，养护90天后的混凝土抗压强度与基准组相当；当水泥替代率更高时，养护28天与90天的混凝土抗压强度均随替代率提升呈比例下降，但28天至90天的强度相对增长率有所提升。此外，养护90天后，掺加SCBA的混凝土混合料的表面电阻率均优于基准组。最后，成本分析结果表明，在混凝土中以10%比例使用SCBA替代水泥，可使每车道英里的建设成本降低0.75%。”