紅土廣泛分布於熱帶、亞熱帶地區，是這些區域主要的土壤種類之一。隨著這些區域的快速發展，對於補強紅土的需求也日益增加 。目前主流的方法是使用水泥、石灰等添加劑改善紅土的力學特性，然而這些添加劑的使用卻會增加溫室氣體的排放量。為了實現環境永續發展，工程單位越來越關注使用再生材料來補強受損土壤的方法。為此，本研究旨在探討以製糖沃土 (以下稱沃土) 補強紅土的長期力學行為分析，以深入了解其補強機制並改善紅土的工程性質，提升紅土工程應用上的潛力。
本研究選取林口地區紅土與善化地區善化糖廠的沃土。首先對林口紅土進行基本物性試驗了解其工程性質，接著使用不同含量 (乾土重的4%、8%、12%、16%、20%) 的沃土作為紅土的添加劑進行一系列試驗，包含標準夯實試驗、無圍壓縮試驗、單向度壓密試驗、自由膨脹試驗與三維體積收縮試驗。本研究通過一系列試驗，探討經沃土補強前與補強後紅土的力學行為及穩定性。同時，對經沃土補強前後之紅土進行X射線繞射 (XRD) 和微觀結構分析 (SEM)，以了解沃土在土壤補強中的作用機制和潛力。
本研究試驗結果顯示，當沃土含量為4%且養置90天時，其抗壓強度增量為888.07%。然而，隨著沃土含量上升，其抗壓強度增量逐漸下降，唯經沃土補強後紅土抗壓強度仍舊高於未經沃土補強之紅土。同時，由XRD與SEM結果可以發現，隨著養置時間逐漸增加產生更多的水化產物，使結構更為緻密從而提高抗壓強度。除了提高抗壓強度外，沃土中也含有大量的纖維，可以與土壤有良好的相互作用從而抑制膨脹量與降低縮性限度。本研究中觀察到使用4%的沃土會使整體紅土工程性能得到顯著提升，儘管壓密量產生小幅提升，但抗壓強度得到顯著的提升，並且可以有效抑制膨脹與收縮性。

Laterite soil is widely distributed in tropical and subtropical regions, and its demand for stabilization has been increasing rapidly with the development of these areas. Currently, the mainstream method to improve the mechanical properties of laterite soil is the use of additives such as cement and lime. However, the use of these additives increases greenhouse gas emissions. In order to achieve environmental sustainability, people are increasingly focusing on the use of renewable materials to stabilize weak soils. Therefore, this study aims to investigate the long-term mechanical behavior of laterite soil stabilized with sugarcane pressmud (PM), to gain insights into its stabilization mechanism and enhance the engineering properties of laterite soil, thus improving its potential in engineering applications.

In this study, laterite soil from Linkou, New Taipei City, and pressmud from Shanhua Sugar Factory, Tainan City, were selected. Then, a series of tests were conducted using pressmud at different content levels (4%, 8%, 12%, 16%, 20% by dry soil weight) as an additive to laterite soil. Through these tests, the mechanical behavior and stability of laterite soil before and after pressmud stabilization were investigated. Additionally, X-ray diffraction (XRD) and scanning electron microscope (SEM) analyses were conducted on laterite soil samples before and after pressmud stabilization to understand the mechanism and potential of pressmud in soil stabilization.

Our result show the use of 4% pressmud significantly improved the overall engineering performance of laterite soil. Although the consolidation index showed a slight increase, the compressive strength showed a significant improvement. Additionally, the use of 4% pressmud effectively suppressed swelling and shrinkage tendencies in the soil.

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