Feasibility of Reusing Marine Dredged Clay Stabilized by a Combination of By-Products in Coastal Road Construction

Abstract

Road construction work on poor subgrade in coastal, port, and reclamation sites is a traditional challenge for geotechnical engineers because of the typically very weak clayey soil in these domains. This research investigates the effects of adding a new green binder (Fa-RmLG), in different proportions and initial water contents, on the engineering properties of marine dredged clay (MDC) collected from Yeosu port, South Korea. The new green binder used is a combination of fly ash (Fa), phosphogypsum (G), lime (L), and red mud (Rm). In this study, five binder mixtures using different proportions of Fa, G, L, and Rm were blended into MDC with different water contents varying in a range of 1.2 to 2.0 times the liquid limit (LL) value. Tests of unconfined compressive strength, California bearing ratio, swelling, and shrinkage were performed on the stabilized MDC mixtures. As a result, large increases in the strength and bearing capacity as well as significant reductions of the swelling and shrinkage values of the stabilized MDC mixtures were recorded compared with unstabilized MDC. Scanning electric microscope and X-ray diffraction analyses were performed to observe the formation and presence of gels inside the stabilized MDC mixtures. Regarding environmental impact, the pH of the stabilized MDC mixtures did not increase above the corrosive limit (pH = 12.5) by the measured pH value. These results indicate that the new green binder can be used as an effective stabilizer for the stabilization of MDC in coastal road construction.

Strength Performance of Alkali Activated Binder and Cement Stabilized Expansive Soil: A Field Study on Subgrade Layer

“…Additionally, the production of calcium silicate hydrate (C-S-H) gels in the clay pores was caused by the release of calcium ions from the cemented soil. When pozzolanic materials like fly ash and slag are activated using AAB, the reactions often result in the formation of cross-linking gels like ettringite (E), CSH, and calcium hydroxide (CH) [18][19]. These gels linked the soil particles together and raised the UCS, strengthening the soil.…”

Enhancing railway track stiffness and sustainability through flowable dredged soil backfill

“…In this research, the substructure layer was designed using the Drucker-Prager/Cap model with a friction angle of 45 o [5]. The remained materials properties used in the finite element design are summarized in Table 3 which ... literature on soil properties [9,10], material specifications [11], and Korean engineering standards [12]. In the FEM modeling, the horizontal axis of the model was completely fixed (2=0) while all displacements were constrained at the bottom (1=2=3 =0).…”

The Effect of Baghouse Dust from Secondary Aluminum Processing Waste on Cement Hydration and Mechanical Properties

“…It is unanimously reported that the demand for portland cement and concrete, which are the most critical construction materials, has been significantly accelerating due to the global urbanization taking place over the world [1][2][3][4][5]. In 2021, 92 million metric tons of portland cement were produced in the U.S. and a total of 4.4 billion tons were manufactured worldwide [6].…”