Abstract The potential of using ashcrete to improve the microstructural, microspectral and shrinkage properties of expansive soils has been investigated under laboratory conditions. In addition to microstructural, three chemical modulus (TCM) and microspectral examinations, responses to linear shrinkage, volumetric shrinkage and crack width were also investigated using 30-day drying periods for expansive soil treated with ash cement. Moisture-related infrastructures such as the sub-floor of resilient pavements are prone to moisture by the rise and fall of the water table during seasonal changes. Therefore, the effect of soil improvement on soil morphology, chemical content and microspectral patterns was investigated. The soil was classified and characterized as (A-7-6) high plasticity soil and poor classification conditions. The hybrid sawdust ash (SDA) known as ashcrete, which has zero carbon footprint was obtained by activating SDA by mixing it with a reformulated activator material (a mixture of 8 M NaOH and a solution of NaSiO2 in a 1:1 ratio). The zero carbon cement was further used in percent-by-weight proportions of 3, 6, 9 and 12 for the soil improvement. X-ray fluorescence (XRF) and scanning electron microscopy (SEM) experiments were carried out to evaluate the pozzolanic resistance via the chemical composition of the oxide, TCM and the profile of the surface contour of the additives and the soil. XRF exposures revealed that the additives had lower pozzolanic resistance, which increased with the improved mixtures thus forming an improved soil mass. In addition, it showed that TCM silica moduli dominated soil stabilization with ashcrete. Scanning electron microscopy examination showed an increase in soil-ettringite and gel formation with the addition of ashcrete. Also, the microspectral studies of chemical oxide EDXRF and XRD have shown excellent results at 12 mass percent cement and soil cement, which has optimized aluminosilicate formation more than 70% and formation of calcite and quartz that has shown the potential of a zero carbon stabilization geomaterial ash cement as a good complementary binder.

中文翻译：

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干燥对灰混凝土 (HSDA) 处理的软土用作柔性路面基础的影响：零碳稳定剂方法

摘要 在实验室条件下，研究了使用灰混凝土改善膨胀土的微观结构、显微光谱和收缩特性的潜力。除了微观结构、三种化学模量 (TCM) 和显微光谱检查外，还使用灰水泥处理的膨胀土 30 天干燥期研究了对线性收缩、体积收缩和裂缝宽度的响应。与水分相关的基础设施，例如弹性路面的底层地板，在季节性变化期间容易因地下水位的上升和下降而受潮。因此，研究了土壤改良对土壤形态、化学成分和微光谱模式的影响。土壤被分类定性为（A-7-6）高塑性土壤，分类条件差。通过将 SDA 与重新配制的活化剂材料（8 M NaOH 和 NaSiO2 以 1:1 的比例混合）混合来活化 SDA，获得了被称为 ashcrete 的混合锯末灰 (SDA)，其碳足迹为零。零碳水泥以 3、6、9 和 12 的重量百分比进一步用于土壤改良。进行了 X 射线荧光 (XRF) 和扫描电子显微镜 (SEM) 实验，通过氧化物、TCM 的化学成分以及添加剂和土壤的表面轮廓轮廓来评估火山灰抗性。XRF 暴露表明添加剂具有较低的火山灰抗性，随着改进的混合物的增加而增加，从而形成了改进的土壤质量。此外，它表明中药二氧化硅模量在灰泥稳定土壤中起主导作用。扫描电子显微镜检查表明，随着灰烬混凝土的添加，土壤钙矾石和凝胶的形成增加。此外，化学氧化物 EDXRF 和 XRD 的显微光谱研究表明，在 12 质量百分比的水泥和土壤水泥下，铝硅酸盐的形成优化了 70% 以上，方解石和石英的形成已显示出零碳稳定地质材料的潜力。白蜡水泥作为良好的补充粘合剂。