This standard outlines a laboratory procedure to measure the content of bituminous stabilizers like bitumen or tar in stabilized soils. It is crucial for ensuring quality control in soil stabilization, particularly in civil engineering applications involving road construction and soil improvement. The method provides precise steps for solvent extraction and quantification of bituminous binder proportions.
Overview
This standard outlines a laboratory procedure to measure the content of bituminous stabilizers like bitumen or tar in stabilized soils. It is crucial for ensuring quality control in soil stabilization, particularly in civil engineering applications involving road construction and soil improvement. The method provides precise steps for solvent extraction and quantification of bituminous binder proportions.
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The standard recommends using dichloromethane (methylene chloride) as the solvent for extracting bituminous stabilizers from stabilized soils. This solvent effectively dissolves bituminous materials, allowing for accurate measurement of stabilizer content. The process involves mechanical shaking with dichloromethane followed by filtration to separate insoluble residues.
Sample size depends on soil classification determined by particle size passing certain IS sieves. Fine-grained soils require 150-200 g, medium-grained soils 1,000-1,500 g, and coarse-grained soils 5,000-6,000 g. The bulk sample is reduced by hand and quartered repeatedly, with slight warming permitted to facilitate breaking down, ensuring representative and sufficient sample weight.
The test requires a wide-mouth metal bottle for mixing, powdered silica gel to absorb moisture, steel balls (for fine soils) to aid mixing, a mechanical shaker for agitation, dichloromethane solvent for extraction, a rubber stopper to seal the bottle, and a vacuum reservoir for solvent recovery. This setup enables effective extraction and quantification of bituminous stabilizer content.
The standard accounts for insoluble components such as wax or mineral matter by dissolving a representative stabilizer sample in dichloromethane and filtering it through a Gooch or sintered silica crucible or filter paper. The insoluble residue is weighed, and the percentage of soluble stabilizer is calculated and used to correct the stabilizer content in the soil sample, ensuring accurate representation.
When ambient temperature is above 30°C, the test procedure adjusts vacuum pressure during solvent evaporation to reduce solvent loss and frothing. For bitumen emulsions or tars with equivalent viscous temperature above 42°C, pressure is decreased to 150 mm Hg over 1.5 minutes and held for 3.5 minutes. For petroleum oils or cut-back bitumens and tars below or equal to 42°C, pressure is raised to atmospheric then reduced to 450 mm Hg following the same timing. These modifications ensure accurate stabilizer content measurement under high temperature conditions.
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