Volume Change and Compressive Strength of Compacted Lateritic Soil Under Drying-Wetting Cycle Repetition

Strength Characteristics of Compacted Fly Ash Treated Expansive Soil due to Wetting-Drying Cycles Repetition

“…Previous studies found no difference test results after the fifth drying-wetting cycle [20]- [23]. Table 1 and Figure 2 summarize the drying-wetting process model for all compacted samples, modified based on previous studies findings [7], [12].…”

“…The expansive clay in this study was obtained from Tabona, Ternate City, with the sampling point located at 0 o 46'33 "N and 127 o 43'21 "E, as shown in Figure 1. Following that, the clay was mixed with commercially available Bentonite to produce a moisture content of 198%, indicating that the mixed soil has high plasticity according to the unified soil classification system (USCS) [7]. Fly ash obtained from the Tidore power plant was added at a rate of 5% to 15%, depending on the weight ratio.…”

“…Natural clay has a maximum dry density of 1.2001 g/cc at an optimum moisture content of 28% and a suction value of 4500 kPa [7], whereas expansive soil mixed with 5% FA has a maximum dry density of 1.3 g/cc at an optimum moisture content of 28% and a suction value of 15,615.47 kPa. It also has a 15% FA of 1.32 gr/cc at 23.7% optimum water content and suction of 1046.08 kPa.…”

“…Several previous studies using different methods and soil types concluded that the decrease in soil compressive strength after the fourth cycle is negligible. Previous research has discovered that as the number of drying cycles increases, the bleach concentration decreases [7], [11], [12], [23]. The increased soil saturation (Sr) due to the cycle's repetition caused this decrease.…”

“…The soil in the tropics is constantly drying and wetting due to the alternating rainy and dry seasons. Repeated drying and wetting cycles will cause physical and mechanical properties to change [7]. Mixing fly ash with expansive clay is one method of chemical stabilization.…”