Abstract
The paper presents the findings of a research work performed on a real scale concrete pavement project where Rubblizing technology was used for its structural rehabilitation. Rubblizing may be defined as a fracture technique in which a concrete pavement slab is transformed in a granular base with a very high Modulus. This technique, fractures the concrete slab in angular pieces by using a concentrated dynamic load of low amplitude and high frequency. The research work was based on field study on the rehabilitation of 5 km motorway. The structural evaluations where made, before, during and after one year construction. Measurements and site evaluation where made by using DCP, Light Weight Deflectometer and FWD (on top of asphalt layer) and excavating inside pits. The structural capacity of the Rubblized layer was evaluated through theoretical analysis. Because of the anisotropic properties of the Rubblized layer the results are presented using AASHTO structural layer coefficient. The structural layer coefficients recommended are between the range of 0.25 and 0.30 for concrete slabs with thickness grater than 220 mm.
Highlights
In Chile, where concrete roads and streets are relatively common (25–30 % of the area paved with asphalt), considerable experience has been acquired in the design, construction and maintenance of concrete pavement
The structural rehabilitation of such pavement generally consists in direct reinforcement with hot mix asphalt (HMA) overlays (1) and no experimental research has been conducted on other construction techniques
Two alternative methods may be used to prevent reflective cracking: the first involves the use of an eight-cm intermediate layer of open-graded HMA and the second, the pouring of a 25-30-cm intermediate aggregate layer with a CBR of 80%
Summary
The paper presents the findings of a research work performed on a real scale concrete pavement project where Rubblizing technology was used for its structural rehabilitation. Rubblizing may be defined as a fracture technique in which a concrete pavement slab is transformed in a granular base with a very high Modulus. This technique, fractures the concrete slab in angular pieces by using a concentrated dynamic load of low amplitude and high frequency. The structural layer coefficients recommended are between the range of 0.25 and 0.30 for concrete slabs with thickness grater than 220 mm. (*) Escuela de Ingeniería, Pontificia Universidad Católica de Chile. (*) Escuela de Ingeniería, Pontificia Universidad Católica de Chile. (**) Centro de Ingeniería e Investigación Vial, DICTUC S.A
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