Abstract
This research work represents updated results of cohesive soil strength improvement with mineral wool fly ash. In the investigations, these materials were used: Portland cement CEM I 42.5 R, fly ash obtained from a mineral wool production process, sand and clay. Mixtures were prepared as follows: dry mixing of Portland cement and fly ash; dry mixing of sand and clay; adding water into Portland cement and fly ash; adding sand and clay mixture into already prepared Portland cement and fly ash suspension. The content of fly ash replacing Portland cement varied from 0% to 40%, and the content of sand mixture varied from 20% to 60%. After 24 hours, investigated samples were taken out from cylinder forms and kept in a desiccator with a humidity of 90% and at 20 °C temperature. Uniaxial compressive strength of the samples was determined after 548 days and compared to previous research results obtained after 7, 28 and 183 days. The most predictable compressive strength is for samples, which composition is 100% cement and 0% fly ash. In these samples, the highest compressive strength was obtained, comparing them to the other investigated samples. Compressive strength change is minimal for samples with a 10–30% amount of fly ash. The most significant decrease in compressive strength was obtained for samples with a 40% fly ash after 183 days. Nonetheless, the compressive strength of these samples increased after 548 days and is almost the same as for samples with 100% Portland cement.
Highlights
Soil stabilisation is widely used in many road construction applications
Fly ash is used as an expansive soil stabiliser (Jalal et al, 2020; Sharman & Sivapullaiah, 2016), curing agent for man-made contaminated soil (Li et al, 2018), organic soil stabiliser (Nath et al, 2017), cohesive or non-cohesive soil stabiliser (Binal, 2016; Simatupang et al, 2020; Zakarka et al, 2019), or for other purposes (Elahi et al, 2020; Khajeh et al 2020; Luo et al, 2018; Phummiphan et al, 2016)
197-1:2011/P:2013 Cement – Part 1: Composition, specifications and conformity criteria for common cements; - fly ash (FA) obtained from a mineral wool factory in Vilnius (Lithuania) as mineral wool production waste, the chemical composition of which is presented in Table 1; - sand, which granulometric composition is presented in Figure 1, was used in previous research (Zakarka et al, 2019); - clay powder (CP), which chemical composition is presented in Table 1, and water
Summary
Soil stabilisation is widely used in many road construction applications. There is a possibility to apply such methods for soil stabilisation, which allow to reduce the costs of soil stabilisation and solve ecological problems. Like stabilisation using glass waste (Baldovino et al, 2021), shredded tire (Behnood, 2018), volcanic ash (Ghadir & Ranjbar, 2018), fly ash (Jalal et al, 2020; Riekstins et al, 2020), or ferric chloride solution as electronic industry waste for hardening of polymer resins by soil grouting (Mackevičius et al, 2019) are still being tested, and their applicability is relatively narrow. Fly ash (FA) has been used successfully in many projects as a low cost and environmentally friendly filler and its effect on the properties of mixed asphalt (Mirković et al, 2019; Woszuk et al, 2019). Fly ash improves strength characteristics of soils, stabilises bases or subgrades, stabilises backfill, reduces lateral earth pressures, and stabilises embankments to improve slope stability. Fly ash is used as an expansive soil stabiliser (Jalal et al, 2020; Sharman & Sivapullaiah, 2016), curing agent for man-made contaminated soil (Li et al, 2018), organic soil stabiliser (Nath et al, 2017), cohesive or non-cohesive soil stabiliser (Binal, 2016; Simatupang et al, 2020; Zakarka et al, 2019), or for other purposes (Elahi et al, 2020; Khajeh et al 2020; Luo et al, 2018; Phummiphan et al, 2016)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
