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The role of the road foundation layer sometimes called sub base layer or unbound layer within the pavement is to act as a stable platform on which the upper layers of the pavement can be compacted and constructed. The unbound layer should also be permeable and non-frost susceptible and they should operate as a frost protection layer, insulating the sub grade against frost attach. Also an unbound layer should spread the traffic load to reduce stress on the underlying pavement layer and the sub grade, thus preventing overstress and rutting in the sub grade. The role of the road foundation layer sometimes called sub base layer or unbound layer within the

Figure 1 The role of the road foundation layer sometimes called sub base layer or unbound layer within the pavement is to act as a stable platform on which the upper layers of the pavement can be compacted and constructed. The unbound layer should also be permeable and non-frost susceptible and they should operate as a frost protection layer, insulating the sub grade against frost attach. Also an unbound layer should spread the traffic load to reduce stress on the underlying pavement layer and the sub grade, thus preventing overstress and rutting in the sub grade. The role of the road foundation layer sometimes called sub base layer or unbound layer within the

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Stancombe: Primary limestone aggregates used for road base materials in UK
Stancombe: Primary limestone aggregates used for road base materials in UK
Table 2. Conditioning stress levels — method B (BS EN 13286-7, 2004).
Table 2. Conditioning stress levels — method B (BS EN 13286-7, 2004).
Table 3. Stress levels for the resilient behaviour — method B (BS EN 13286-7, 2004).
Table 3. Stress levels for the resilient behaviour — method B (BS EN 13286-7, 2004).
Fig. 2 illustrates a schematic sketch of the triaxial cell containing a sample ready for test. Axial linear variable displacement transducers (LVDTs) have been mounted vertically on the sample prior to putting the sample into the cell. Radial LVDTs are already installed on the cell. Having the cell sealed, the LVDTs are connected to the computer and a software receives data and records them according to the BS EN 13286-7:2004 in a file.
Fig. 2 illustrates a schematic sketch of the triaxial cell containing a sample ready for test. Axial linear variable displacement transducers (LVDTs) have been mounted vertically on the sample prior to putting the sample into the cell. Radial LVDTs are already installed on the cell. Having the cell sealed, the LVDTs are connected to the computer and a software receives data and records them according to the BS EN 13286-7:2004 in a file.
Table 4 Deviator (N/mm”) stress and confining pressure. Adding GBS fine particles within the samples and in the presence of the water at the level of optimum moisture content to which each samples were made activates the fine particles of the limestone dust and SS dust and improve the hydration products which act as a binding agent/paste in the mixes. A closer look at these mixes suggested that they are concrete-like lightly bound road foundation. This has suggested that the limestone and SS dust has reacted with water in the present of the GBS dust which acted as an activator.
Table 4 Deviator (N/mm”) stress and confining pressure. Adding GBS fine particles within the samples and in the presence of the water at the level of optimum moisture content to which each samples were made activates the fine particles of the limestone dust and SS dust and improve the hydration products which act as a binding agent/paste in the mixes. A closer look at these mixes suggested that they are concrete-like lightly bound road foundation. This has suggested that the limestone and SS dust has reacted with water in the present of the GBS dust which acted as an activator.
Figure 3. Resilient modulus of control mixes compared with the mixes containing waste dust
Figure 3. Resilient modulus of control mixes compared with the mixes containing waste dust
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Materials ScienceGeotechnical Engineering
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