article · Alfa Mühendislik ve Uygulamalı Bilimler Dergisi
Treating tropical lateritic soil with calcium chloride salt modifies its engineering characteristics for potential use in road pavement construction. Testing soil samples with chemical concentrations between 4% and 16% reveals that the additive increases soil coarseness. Maximum dry density drops initially from 1.63 megagrams per cubic metre in untreated soil to 1.45 at 4% concentration, but rises to 1.97 megagrams per cubic metre at 16% concentration. Concurrently, optimum moisture content peaks at 19.47% at a 4% additive level before declining as more chemical is introduced. Statistical evaluation via regression and analysis of variance confirms meaningful changes across most compaction measures, though the plasticity index remains constant. Chemical treatment enhances the structural properties of tropical soil, supporting low-traffic road pavement design when additive levels and liquid limits are closely monitored.
Tropical soils frequently require chemical stabilisation to carry traffic loads reliably. Demonstrating that calcium chloride salt improves soil density and compaction behaviour provides a clear basis for strengthening local subgrades. This enables the construction of more durable low-traffic roads using locally available earth, potentially reducing reliance on costly imported aggregate materials.
The findings apply to civil engineering contractors and transport authorities designing low-traffic or rural road pavements. At present, the work represents applied, laboratory-tested research based on standard compaction protocols. Moving towards commercial deployment would require field trials to validate how the chemically treated soil performs under continuous vehicular traffic, varying moisture conditions, and real-world environmental weathering.
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This study investigated the regression analysis of tropical soil (TS) stabilised with calcium chloride salt (CCS) using the Standard Proctor Method (SPM) to assess its suitability as a pavement construction material. Laboratory tests, including Atterberg limits (liquid limit, plastic limit, and plasticity index) and compaction parameters (maximum dry density, MDD; optimum moisture content, OMC), were conducted on both natural and stabilised soils in accordance with British Standard Light specifications. CCS was applied at concentrations ranging from 4% to 16%. Results were evaluated using analysis of variance (ANOVA) and regression analysis. Findings indicated that increasing CCS content increased the coarseness of the lateritic soil. MDD initially decreased from 1.63 Mg/m³ (untreated) to 1.45 Mg/m³ at 4% CCS, then increased to 1.97 Mg/m³ at 16% CCS, while OMC rose from 19.47% at 4% CCS and declined progressively at higher CCS. Regression analyses confirmed significant differences across most test parameters, except for the plasticity index, which showed no variation. High coefficient values were recorded across treatments. The study concludes that CCS effectively improves the engineering properties of tropical soils and recommends close monitoring of CCS content and liquid limit parameters during pavement design for low-traffic road applications.
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DOI: 10.70988/ajeas.1936384
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