This study investigates the influence of wood pellet fly ash blended binder (WABB) on the mechanical properties of typical weathered granite soils (WS) under a field and laboratory tests. WABB, composed of 50 % wood pellet fly ash (WA), 30 % ground granulated blast furnace slag (GGBS), and 20% cement by dry mass, was applied at dosages of 200-400 kg/m3 to four soil columns were constructed at a field site deposited with WS. After 28 days, field tests, including coring, standard penetration tests (SPT), and permeability tests, revealed enhanced soil cementation and reduced permeability, indicating a denser soil matrix. Unconfined compressive tests (UCT) and free-free resonant column (FFRC) tests on field cores at 28 and 56 days, compared with laboratory specimens and previously published data, demonstrated strength gains 1.2-2.1 times higher due to field-induced stress. The presence of clay minerals influenced the WABB's interaction and microstructure development. Correlations between seismic waves, small-strain moduli, and strength were developed to monitor in-situ static and dynamic stiffness gain of WABB-stabilized weathered granite soils.

Recovery of field samples provides unique information about the strength and the long-term functionality of deep stabilized soil in actual transportation infrastructures. This paper presents the results of uniaxial compressive tests for the stabilized field samples of two railway sites and one street site located in Finland. Based on the research findings, there is considerable variation in the shear strength of the field samples, with coefficients of variation (COV) ranging from 0.12 to 0.61. However, the average strengths across all sites achieved their target values set during design. The results demonstrate a significant increase in strength over time, especially at the older research sites. In a railway site where deep stabilization was performed 3.5 years ago, the average shear strength of the stabilization was 797 kPa, which is more than seven times greater than the target strength for the stabilized columns. The relationships between shear strength and deformation ratios for the columns and soil surrounding the columns exceed the assumed ratio values presented in the guidelines of Finnish Transport Infrastructure Agency (FTIA), which present a value of less than 20 for completed stabilization. Based on the results of all sites, the deformation ratio between columns and clay was found to be as much as 101. This result implies that the stress concentrates more on the columns than assumed in the FTIA's guidelines. Nevertheless, the structures have performed well without any visible differences in settlement or other damages.

In this paper we present experimental investigation of the frequency dependence of nonlinear elastic (Murnaghan) moduli of polystyrene samples by the ultrasonic method based on the acousto-elastic effect. Measurements were performed in a wide frequency range, from 250 kHz to 2.5 MHz. The absolute values of the Murnaghan moduli demonstrated considerably nonlinear dependencies on the ultrasound frequency. While at higher frequencies above similar to 600 kHz no significant variations of the moduli occurred, at lower frequencies a drastic rise of absolute values in several orders of magnitude has been observed. The values obtained at lower frequencies were utilized for theoretical estimation of parameters of a strain solitary wave in this material. The data obtained correlated well with the parameters obtained experimentally and allowed for explaining the long-lasting discrepancy between theoretical estimations and experimental results.