CURING EFFECTS OF LIGNIN AND TERRAZYME AS STABILIZERS IN PROBLEMATIC SOIL

A primary concern of lignin and terrazyme as soil stabilizers is the optimization of curing time, as there is considerable uncertainty in determining the ideal duration for different soil types and environmental conditions. There is limited understanding of the chemical interaction mechanisms between these stabilizers during the curing process, particularly when used in combination. The main aim of this study is to evaluate the effect of the number of curing days and the percentages of stabilizers. The laboratory tests, including compaction, Unconfined Compressive Strength (UCS), and California Bearing Ratio (CBR), were done for untreated and treated soils. According to the Unified Soil Classification System (USCS), both laterite and kaolin are high-plasticity clays. The moisture-density relationship from compaction shows insignificant changes after adding the stabilizers for all soils. From the UCS test results, laterite with 5% of terrazyme (LT5%) showed the highest improvement with 926 kPa at day 21. The highest CBR values came from LT5% samples, at 19.13% under unsoaked conditions and 16.27% for soaked conditions. Curing has been demonstrated to strongly influence the properties and performance of chemically stabilized soils. As additional analysis, two-factor analysis of variance (ANOVA) with replication was employed to investigate potential interactions between the number of curing days and the percentages of stabilizers. The interaction effects between terrazyme and laterite with p-value of 3.78E-08, indicates that their combined proportion and curing duration may determine terrazyme's effectiveness.