Efeito da adição de cimento Portland e RAP na estabilização de solo argiloso da formação Guabirotuba

Abstract

The increasing use of alternative materials in engineering allows the use of materials that do not have adequate destination and also reduce costs. Road transport leads the brazilian transport matrix, impacting on a great flow of loads end people by road, Road maintenance programs have in their scope the service of milling the pavement layer instead of CBUQ, generating large amount of reclaimed asphalt pavement. Due to few routine procedures and projects for its use, the reclaimed asphalt pavement sometimes, is not used, being deposited along the edge of the road. In this aspect, the present work demonstrates as an alternative to the current problem the addition of reclaimed asphalt pavement in a sedimentary soil belonging to the Guabirotuba Formation, from the region of Curitiba for its use as a pavement layer. Percentages of 0%, 20%, 40%, 50%, 60% and 80% of reclaimed asphalt pavement, with and without cement, were used in the mixture. The 3% cement was used. After the characterization of the materials used in the mixture, the compaction curves of each mixture were elaborated, using the intermediate energy. The results of unconfined compressive strength and splitting tensile strength had increases in their values up to the amount of 60% of reclaimed asphalt pavement, increasing around 260 kPa with the addition of 60% of reclaimed asphalt pavement from the values of pure soil in the unconfined tensile strength without cement and around 770 kPa with the addition of 60% milled material and with the addition of 3% cement at 28 days curing. In the trials of splitting tensile strength without cement and with 60% of reclaimed asphalt pavement there was an increase around 38 kPa and with cement at 28 days curing there was an increase around 340 kPa of pure soil. The ISC tests had increases with the addition of reclaimed asphalt pavement, with the addition of 80% of reclaimed asphalt pavement the ISC value was 18.62% and with pure soil the value was 3.52%. Adding cement and with 80% addition of reclaimed asphalt pavement the value was 113.43 kPa. The RAP also proved beneficial with the expansion of the samples, reducing from 1.19% expansion in pure soil to 0.88% with the addition of 80% of RAP, and with the addition of cement the value found was 0.86%. The samples without cement are suitable for use as base and subgrade reinforcement considering expansion 1% and ISC > 2% and the samples with cement, from the addition of 40% are suitable for its use as sub-base layer, with expansion of 1% and ISC > 20%.