STRUCTURAL EVALUATION OF ROLLER COMPACTED CONCRETE PAVEMENTS BASED ON FWD DEFLECTION DATA . THIRD INTERNATIONAL CONFERENCE ON BEARING CAPACITY OF ROADS AND AIRFIELDS. PROCEEDINGS, NORWEGIAN INSTITUTE OF TECHNOLOGY, TRONDHEIM, NORWAY, JULY 3-5 1990. VOLUMES 1-2

This paper presents a method for evaluating the bearing capacity of a roller compacted concrete pavement (RCCP). Several pavement sections were constructed in Hokkaido, Japan, whose materials used various mixtures of cement, fine aggregate, coarse aggregate, admixture and water. Each test pavement was 120 m long and 13 m wide, and composed of 6 sections. A falling weight deflectometer (FWD) was used to estimate the in-situ elastic moduli of the RCCP slabs. The changes in time of the elastic moduli of the slabs were carefully determined, using the FWD data in conjunction with a specially developed backcalculation method. The following conclusions were reached: (1) a known RCCP structure can be evaluated reasonably well by using the layer moduli backcalculation system to analyse the elastic moduli of the layers; (2) the elastic moduli of the RCCP layers increase with time, and the moduli of the subgrade and base course also increase slightly; (3) the calculated elastic moduli agreed reasonably well with those evaluated by laboratory test, using test pieces cut out from the sites. (TRRL)