00930580

Component

https://doi.org/10.3141/1787-06

http://scholar.google.com...ahan&publication_year=2002

The results of a laboratory study demonstrate the significant potential of electrogrouting, a new method for stabilizing soft soils with relatively low hydraulic conductivity. The experiments reported show that migration of stabilizing ions through soil pore fluid under applied direct current (dc) electric fields can be substantial. The method can achieve a more stable soil (i.e., less compressibility and higher shear strength, among other property improvements) without causing significant volume changes. In the experiments reported, the effect of stabilizing Boston Blue Clay (BBC) samples using phosphate ions was investigated. Initially, batch tests were conducted by mixing BBC samples with specific volumes of phosphoric acid solutions prepared at different concentrations. An increase of as much as 280% over the initial strength was achieved at the highest concentration of the acid used (10% of concentrated phosphoric acid solution). From the success of these batch tests, electrogrouting experiments were conducted by placing the soil in special treatment cells and applying a constant voltage gradient for 2 weeks. Electrogrouting the BBC under 1 V/cm dc is 15 times faster than is injection under a unit hydraulic gradient and produced increases in shear strength across the soil, with the greatest strength gain (160% of the initial shear strength) occurring in the soil section near the cathode (negatively charged probe). Additional results show the effects of electrogrouting on soil compressibility. A detailed review is given of the considerations necessary to implement the electrogrouting method in the field.

This paper appears in Transportation Research Record No. 1787, Geomaterials 2002.

English

p. 53-60

2002

Transportation Research Record

0309077125

Figures (7) ; References (18)

Clay soils; Compressibility; Direct current; Electric fields; Fine grained soils; Laboratory studies; Phosphoric acid; Shear strength; Soil stabilization

Electrogrouting

Geotechnology; Highways; I42: Soil Mechanics

TRIS, TRB, ATRI

Sep 19 2002 12:00AM

• COLD IN-PLACE RECYCLING AND FULL-DEPTH STRENGTHENING OF CLAY-TILL SUBGRADE SOILS: RESULTS WITH CEMENTITIOUS WASTE PRODUCTS IN NORTHERN CLIMATES
• EFFECT OF WET-DRY CYCLES ON RESILIENT MODULUS OF CLASS C COAL FLY ASH-STABILIZED AGGREGATE BASE
• EFFECTS OF GRADATION, COMPOSITION, AND DEGREE OF COMPACTION ON THE MECHANICAL CHARACTERISTICS OF RECYCLED UNBOUND MATERIALS
• EFFECTS OF PARTICLE AND MIX CHARACTERISTICS ON PERFORMANCE OF SOME GRANULAR MATERIALS
• FEASIBILITY OF GEOSYNTHETIC INCLUSION FOR REDUCING SWELLING OF EXPANSIVE SOILS
• INVESTIGATION OF RECYCLED CONCRETE MADE WITH LIMESTONE AGGREGATE FOR A BASE COURSE IN FLEXIBLE PAVEMENT
• LABORATORY TESTING OF SUCTION AND DEFORMATION PROPERTIES OF BASE COURSE AGGREGATES
• MEASURED EFFECTS OF LIQUID SOIL STABILIZERS ON ENGINEERING PROPERTIES OF CLAY
• PRECRACKING OF SOIL-CEMENT BASES TO REDUCE REFLECTION CRACKING: FIELD INVESTIGATION
• QUANTIFICATION OF COARSE AGGREGATE ANGULARITY BASED ON IMAGE ANALYSIS
• STABILIZATION OF SILTY SAND WITH NONTRADITIONAL ADDITIVES
• WAVELET-BASED THREE-DIMENSIONAL DESCRIPTORS OF AGGREGATE PARTICLES