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- W604563811 abstract "Plain concrete pavements were tested using the Accelerated Loading Facility (ALF) at a site near Goulburn, New South Wales (NSW), between 1998 and 2000. The site chosen had a high diurnal temperature changes, in the order of 20 deg C, which produced significant interaction of loading and slab curl. This paper reports a summary of the Subbase (Erosion) ALF trial and the results of the analysis of the field data to date. The trial has consisted of an investigation of the influence of 3 subbase types (crushed rock, heavy-bound, and lean mix concrete) on the erosion performance of PCPs using ALF. It was found that there was no fatigue damage in all slabs tested with ALF 80 kN axle load in the Subbase (Erosion) trial. However, it was observed that under ALF loading fines from the crushed rock subbase pumped out along the longitudinal joints of dowelled and undowelled slabs with unbound crushed rock subbases. Very small quantities of subbases (or base) fines were pumped out for slabs with undowelled joints on a heavily bound subbase. Moreover, no evidence of subbase erosion was observed for slabs with dowelled joints on a heavily bound subbase or for slabs with undowelled joints on LMC subbases. Slab curl and loading defection of various slab types were recorded in the erosion trials for the purposes of quantifying the effects of dowels and subbase on erosion life. Analysis of slab curl and loading defection data indicates that: 1) unbound subbases are unsuitable under plain concrete pavements subject to heavy loading; 2) the benefits of dowels need to be retained in plain concrete pavements on highly erodible subbases; 3) the fact that the loading deflections are increasing at a faster rate for heavily-bound subbases, suggests some caution in their use without dowels on heavily trafficked roads; and 4) a minimum slab thickness to reduce curling and the effects of curling on pavement performance be specified for pavements subject to heavy loading. As with all accelerated trials, consideration must be given to long term environmental effects and the possibility of fines moving between the base and subbase which may change loading stresses arising with slab curl. Draining of this interface is considered essential." @default.
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- W604563811 date "2001-01-01" @default.
- W604563811 modified "2023-09-27" @default.
- W604563811 title "EROSION PERFORMANCE OF PLAIN CONCRETE PAVEMENTS UNDER ACCELERATED LOADING" @default.
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