Stabilization of clay using slag and fly ash with reference to UCT value (Case study: Jalan Kadusentar, Pandeglang District-Banten)

Abstract

Expansive soils have low soil bearing capacity so that’s causes often problems in buildings. One ways to repair soil bearing capacity is improve the strength of original soil with chemical stabilization methods using slag and fly ash. The research goals were to find out the effect of adding slag and fly ash with reference to unconfined compressive strength value and physical properties of the soil before and after stabilizing with slag (10%, 20% and 30%) and fly ash (20%) and to know classification soil on jalan Kadusentar, Pandeglang District - Banten based on USCS classification. The results of this study obtained original soil types including the MH category is non-organic clay with high plasticity. The UCT value of original soil was 1, 407 kg/cm2. Addition of slag and fly ash increased the value of unconfined compressive strength and can improve the physical properties of the soil by decreasing the value soil plasticity index. The maximum UCT value is the percentage of 20% fly ash and 10% slag of 8, 393 kg/cm2 including hard consistency with unconfined compressive strength values greater than 4 kg/cm2 with curing time for 14 days.

Comparative analysis of increasing CBR value of soil with adding bamboo leaf ash

“…The table shows the CBR value of the original soil and CBR for each variation. In [5], the CBR value at the optimum percentage was 13.1%, while in the Olugbenga and Adetuberu study, the CBR value at the optimum percentage was 38.21% (sample). A) and 34.99% (sample B) show an increase in the CBR value after stabilization.…”

“…Based on Table 2, the results of the physical properties of the original soil. The research sample of [5], also samples A and B, from research by [9], had a plasticity index > 17%, including the PI in the high category, So that the original soil needs to be stabilized because it has a low bearing capacity value and a fairly high PI. Research [5] and [9] used bamboo leaf ash as a subgrade stabilizer.…”

“…Figure 2 shows that the value of the soil plasticity index reduced, although not dramatically, with the addition of bamboo leaf ash. Research [5] calculated a PI value of 16.94% for the optimal CBR values, including the moderate plasticity group. In comparison, at the optimal proportion of CBR values corresponding to the category of high plasticity, samples A and B from [9] generated a PI value of 39.30 percent and 17.77 percent, respectively.…”

“…Road infrastructure development is growing rapidly with the times, so that in its construction, it is necessary to consider the condition of the subgrade. One of the efforts that can be done to improve the condition of the subgrade, which has a low bearing capacity, is stabilization with ash materials such as fly ash, husk ash, and bamboo leaf ash [1][2][3][4][5][6][7][8][9][10][11]. Ash material contains silica, iron oxide, aluminum oxide, calcium oxide, magnesium oxide, and sulfate [12][13].…”

Sustainable soil stabilization using marble dust waste on high plasticity soils: Physical and mechanical properties study

“…This shows that the soil in that location has weak strength, and it is necessary to take action so that the road can be used safely, one of which is by improving the soil, namely soil stabilization. Murmu et al (2020) and Kumar and Harika (2021) researched soil stabilization using fly ash to improve the mechanical properties of the soil, such as its strength and durability, through the addition of certain materials, such as a combination of fly ash and slag by Fathonah et al (2020), cement slag by Fathonah et al (2019), Kusuma et al (2020), Rind et al (2020), gypsum by Kusuma et al (2018) and Latifi et al (2018), lime by Negi et al (2013), Barbero et al (2021), soil stabilization using cement, bitumen and other additives with the ability to bind soil particles by Rashidi et al (2018). The abundant waste materials from the marble industry are one of the additives usually used for soil stabilization.…”