- •UNIT II
- •PREPARATORY WORKS DURING ROAD RECONSRUCTION
- •1. Arrangement of bypass parallel to the road under reconstruction.
- •2. Arrangement of profile subgrade with prefabricated surface laying along the whole road under reconstruction.
- •3. Motor cars passing along the half of the road
- •Replacement of reconstruction by new construction
- •At significant traffic intensity it is reasonable to observe the problem of new road construction instead of reconstruction. In this case the existing road at the period of new road construction will play the role of bypass.
- •Fig. 3.3. Order of operations at subgrade widening
- •UNIT IV
- •CORRECTION OF VERTICAL ALIGNMENT OF ROAD
- •In some cases simultaneously with excavation deepening for slop stability or snowdrift extant slop steepness is increased (slop flattening).
- •In fig. 4.3 there is a diagram for determination of geometrical parameters of cut deepening.
- •UNIT V
- •RECONSTRUCTION OF HEAVING AREAS
- •Fig. 5.7. Shallow laying drainage construction
- •UNIT VI
- •ROAD PAVEMENT WIDENING AND EDGES STRENGTHENING
- •Carriage way widening value
- •Operations technology
- •Technology.
- •7.1. Variants of road pavement reconstruction.
- •а) detour parallel to reconstructed road;
- •аdhesion – адгезия
- •аggloporite – аглопорит
- •аsphaltenes – асфальтены
- •Berm – банкет
- •Cement activity
b)combined method – due to technical parameters and characteristics of road performance;
c)consumers’ properties.
5. Additional operation at road reconstruction consists of:
а) removal of soil vegetation layer;
b)right of way clearance;
c)all kinds of communication carrying on and reorganization;
d)traffic management scheme.
6.During road reconstruction road – building organization should supply traffic speed not less than:
а) 20 km/h;
b)30 km/h;
c)40 km/h.
7.At unfavorable soil conditions and increased moisture there are constructed the following:
а) detour parallel to reconstructed road;
b)profiled subgrade along the whole reconstructed road with prefabricated blanket placement;
c)traffic movement along the half of the road.
8.What method of geometrical parameters does not refer to subgrade reconstruction:
а) slop leveling;
b)double sided or one sided widening;
c)change of old subgrade by new one.
9.To provide reliable trimming of added soil with existing subgrade there are cut berms in the following cases:
а) at embankment height up to 2 meters;
b)slop steepness from 1:3 up to 1:5;
c)at embankment more than 2-х meters and slop steepness up to 1:3.
10.In embankment from sandy soil berms slop is:
а) to road axis;
b)from rod axis;
c)perpendicularly to road axis.
11. At subgrade widening it is not allowed to use:
а) loamy soil;
b)sand;
c)silty soil.
12. At embankment height and excavation depth up to 4 meters slop is leveled by:
а) motor grader;
б) excavator – dragline or excavator with telescope jip; в) bulldozer with add on equipment.
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13.Which measures are necessary to be applied to escape frost heaps:
а) road base reinforcement;
b) road base water regime soil properties; c) change of existing road base by new one.
14.Soils according to the grade of heaving are devided into
а) four groups; b) five groups; c) six groups.
15. Into lower part of widening part it is recommended to place sandy soil with rate of filtration:
а) 1 m/day and height of capillary raising up to 35 cm;
b) less than 1 m/ day and height of capillary raising up to 45cm; c) more than 1 m/day and height of capillary raising up to 25 cm;
16. Value of compaction ratio at layerwise embankment widening should be:
а) 0,95; b) 1,0; c) 0,98.
17. Which component does not suitable for working mixture content for slop soling by the method of hydro sowing
а) perennial grass seed mixture;
b)fertilizer;
c)mulch material;
d)Portland cement;
e)film-forming material;
f)water.
18.Which factors influence on frost heaves?
а) presence of heaving soils;
b)intensive frost accumulation;
c)slow and deep frost penetration under road base more than 0,5 m;
d)simultaneous combination of factors a),b) and c).
19.For regulation of warm regime of subgrade:
а) increase embankment height;
b)arrange heat insulating interlayer or upper part of embankment;
c)arrange drainages;
d)arrange frost protection layers.
20. Trench drainage structure:
а) crushed stone - pipe;
b)without pipes;
c)without joints.
21. Cross drainages of shallow foundation on the sections with longitudinal
slops:
а) 20 - 40‰; b) 40 - 80‰;
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c) more than 80‰.
22. At widening of road base on 2,0m and more to the direction of road
side:
а) cut off the subgrade from widen side up to the bottom of existing road base;
b)make trench dig along the existing road base;
c)arrange dike dig along the existing road base.
23.What for leveling layer is constructed at one side widening of road
base?
а) for leveling of road surface; б) for road axis replacement;
в) for the same cross slops conservation.
24. Margin course can be:
а) from prefabricated slabs;
б) as the type of main road base; в) from monolithic concrete.
25. At the partial dismounting of road base, for removal of asphalt concrete blanket there is applied:
а) rippers;
б) excavators; в) cutters;
г) motor concrete crows.
26. Materials after removal of asphalt concrete blanket is called:
а) “phresan”;
б) asphatogranulyant (asphalt concrete chip); в) granulyat (chip);
г) kroshka (granulated material).
27. For hot regeneration there is used:
а) Remixer; б) cutter;
в) heater of ДЭ-234 type and , and heat mixer of ДЭ-232 type.
28. For cold regeneration there is used:
а) remixer; б) cutter;
в) heater of ДЭ-234 type and heat mixer of ДЭ-232 type.
29. Rehabilitation of road base with cement concrete blanket can be fulfilled by the following methods:
а) arrangement of reinforced layers from asphalt concrete mixtures over old cement concrete blanket without destruction of its integrity;
б) the same with preliminary crushing of old cement concrete blanket ad carefully compaction of received by the same way foundation material;
в) arrangement of reinforced layer from continuous reinforced concrete over cement concrete blanket.
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