Evaluation of the Effect of Binary Fly Ash-Lime Mixture on the Bearing Capacity of Natural Soils: A Comparison with Two Conventional Stabilizers Lime and Portland Cement

Abstract

This study evaluates a binary mixture of fly ash and lime as a stabilizer for natural soils. A comparative analysis was performed on the effect on the bearing capacity of silty, sandy and clayey soils after the addition of lime and ordinary Portland cement as conventional stabilizers, and a non-conventional product of a binary mixture of fly ash and Ca(OH)2 called FLM. Laboratory tests were carried out to evaluate the effect of additions on the bearing capacity of stabilized soils by unconfined compressive strength (UCS). In addition, a mineralogical analysis to validate the presence of cementitious phases due to chemical reactions with FLM was performed. The highest UCS values were found in the soils that required the highest water demand for compaction. Thus, the silty soil added with FLM reached 10 MPa after 28 days of curing, which was in agreement with the analysis of the FLM pastes, where soil moistures higher than 20% showed the best mechanical characteristics. Furthermore, a 120 m long track was built with stabilized soil to evaluate its structural behavior for 10 months. An increase of 200% in the resilient modulus of the FLM-stabilized soils was identified, and a decrease of up to 50% in the roughness index of the FLM, lime (L) and Ordinary Portland Cement (OPC)-stabilized soils compared to the soil without addition, resulting in more functional surfaces.

Marble Powder as a Soil Stabilizer: An Experimental Investigation of the Geotechnical Properties and Unconfined Compressive Strength Analysis

“…As seen in Figure 13 , curing time stands out as the most influential parameter impacting UCS, with over 32% weighting. This aligns with Wang et al, who demonstrated enduring strength development in stabilized soils corresponding directly to progressive pozzolanic activity over months [ 70 ]. The second and third-ranked features—molding water content and marble powder percentage—exhibit comparable contributions of around 26% each.…”

Sustainable Hybrid Lightweight Aggregate Concrete Using Recycled Expanded Polystyrene

“…According to ASTM C 618:2019, FA can be classified as type F [48,49]. This FA type has an acidic composition since it contains mainly silica and a small amount of calcium, as shown in Figure 1.…”

Optimized Workflow Framework in Construction Projects to Control the Environmental Properties of Soil

“…For Ni, the results of estimated leaching look similar and in the same way as for As. Likewise, the regression equation was used from Figure 7 for modelling the data using a time span of 365 days to evaluate possible leaching of Ni per m 2 during one year by Equation (2). The computed data give an estimated amount of leaching of Ni as 2.8178 mg/m 2 per year.…”

“…Soil treatment is a challenging civil engineering task with many applications, such as soil stabilization [1][2][3][4], soil remediation [5][6][7], and increasing soil permeability [8][9][10]. These tasks aim at improving geotechnical and environmental properties of soil prior to construction works [11][12][13][14].…”