The chemical stabilization of soils by liquid route is the technology developed in Brazil by the INSTITUTE IDESA AMAZÔNIA, with the mark ECOLOPAVI registered in the BRAZILIAN INSTITUTE OF BRANDS AND PATENTS. It is the technology offered to our country and overseas countries to remedy the great difficulties of the construction of urban and road pavements without the necessary basic treatment, always for the ground to respond to the aggressions of the traffic with the capacity of acquired resistance.
EMPLOYMENT OF STABILIZER ECOLOPAVI
Any soil that visually withstands the action of commercial vehicle wheel loads when dry, without collapsing, is capable of being stabilized with ECOLOPAVI.
Starting from this premise, and since pavement design methods are based on the selection of materials according to their resistance to the penetration of a piston in a molded and saturated sample, as in the CBR Method, soils stabilized with ECOLOPAVI must be submitted to laboratory tests, to determine the possibility of their use in layers of pavements.
As the shear strength of a soil is the result of the sum of two factors, the intergranular friction and the cohesion, can be determined previously:
a) Sand-clayey soils with a great deal of intergranular friction can be stabilized with ECOLOPAVI in the ratio of 1: 1.00 by weight and neutralizing Aluminum Sulphate in a ratio of 1: 5.00 by weight. Its sand fraction guarantees great resistance due to intergranular friction, and its clay fraction, impermeabilized with ECOLOPAVI, adds more resistance due to cohesion, reaching high values of CBR.
(b) Thin clay-sand or clay-silt soils, with little or no intergranular friction, require the addition of hydrated lime-type binders or Portland cement to reach higher CBR values, in the ratio of 1% to 3% in weight, in addition to the addition of ECOLOPAVI in the proportion of 1: 1.50 by weight. The increase in strength is, in this case, directly proportional to the increase in the dosage of the binder.
Since soils are extremely variable in nature, it is necessary to research in the laboratory the most adequate dosages for their stabilization, taking into account also the economic aspects.