Twelve column specimens were tested using concrete of compressive strength 24 and 28 MPa mixed with 0.6 and 1 mm tyre rubber particles.
Results similar to those found for a tracked machine were also achieved by three passes of a 900 mm section width tyre at 5 t load and 0.5 bar inflation pressure.
The vehicle had tyres 190 mm wide and inflated to 3.2, 2.4, 1.6 and 0.8 bars, equivalent to 320, 240, 160, and 80 kPa, respectively.
Results showed that (a) the optimum machine settings, identified by the greatest production score (PS), were characterised by a tyre pressure of 138 kPa, a tyre speed of 440 rpm, and a 15 mm spacing between the surfaces of the tyre and the sieve; (b) the optimal betel nut fruit moisture content was 6.31% w.b.
This paper presents a study on compactness of four different fractions of scrap tyre rubber (A: 0.1 – 1 mm, B: 0.5 – 2 mm, C: 2 – 5 mm and D: 10 – 40 mm) in the standard Proctor test.
Coarser TDAs behave more like self-draining materials – they retain much less water and the maximum moisture content equals to about 18%, 23 % and 38 in case of tyre chips (D), 2 – 5 mm grains (C) and 0.5 – 2 mm grains (B) respectively.
The mean stud protrusion of tyres on the measurement vehicles before the test was 1.1 mm for the front tyres and 1.1 mm for the rear tyres and after the test 1.5 mm and 1.4 mm, respectively.
In this study, waste bladder tyres (RA) mechanically cut in 25, 50 and 75 mm lengths were used by volumetric replacement of coarse aggregates in self-compacting concretes (SCC).
Quasi-static tests show the maximum values of vertical rim displacement and lateral tyre deflection are in the range of 72.2 78.9 mm and 23.3 27.1 mm, respectively, for a severe excitation condition.
The solid tyre fitted to the wheel has an outside diameter of 200 mm and width of 50 mm.
