Soil stabilized,geosynthetic &cement concrete prestressed

road

By :ANKIT KUMAR

soil stabilized roads Step1 Stabilization

Soil stabilization is the process whereby soil and related materials are made stronger and more durable by mixing with stabilizing agents. The common method to achieve soil stabilization are:a) Stabilization by compactionb) Mechanical stabilizationc) Stabilizing by the use of stabilizing additives like cement, lime, bitumen and many other stabilizers available in the market. Alternatively, you may use TopSeal-SoilStabilizer a Soil Stabilizer & Strengthener.

100% Environmentally safeNon-toxic, non-flammable non-corrosive, non-allergenicWater-based liquid form

Step 2 SeaIing

The stabilized soil surface is then sealed with TopSeal SOIL SEALANT, providing a waterproof layer to prevent rain water penetration into the soil and keep the road in condition at all times. A stabilized soil road in dry condition will perform in its best condition with TopSeal Soil Sealant covered on soil surface, making it dust free and mud free at all times.

Waterproof.No erosion by rainwater & trafficMaintain soil/gravel road strength even during rainy seasonsDust & mud freeMinimum maintenanceNot slippery, overcoming hilly road problemsSeal stabilized soil surface using Top Seal Soil Sealant

Step 3MaintenancePatching any pothole or depression by mixing

roadside soil with TopSeal-SoilStabilizer, followed by sealing a layer of TopSeal Soil Sealant on the affected area. Maintenance can be done as and when required for long-lasting road.Pothole & Depression Maintenance

Geo-synthetic RoadGeosynthetics are a class of building materials,

which differ in structure, technology, performance characteristics, composition of raw materials. They are united by a convenient form of delivery (rolls, blocks, tiles), the ability to ensure a high quality geosynthetic materials in factory-built, that is, the ability to create additional layers (strata) of assured quality at the lowest labor costs for job site and minimum relative transport costs.

Cement Concrete Pre-Stressed Road The advantages of prestressed concrete have

been known for some time. But the technique of prestressing concrete for highway use has presented problems. And although many authorities believe that a prestressed concrete highway should have many advantages over a conventional road, the problem has been to find economical method of building it.

PRESTRESSED CONCRETE Prestressed concrete, invented by Eugene

Frevssinet in 1928 is a method for overcoming concrete’’s natural weakness in tension . It can be used to produce beams , floors or bridges with a longer span than is practical with ordinary reinforced concrete.

It can be accomplished in three ways: pre-tensioned concrete, and bonded or unbonded.

Pre-tensioned concrete Pre-tensioned concrete is cast around already

tensioned tendons. This method produces a good bond between the

tendon and concrete, which both protects the tendon from corrosion and allows for direct transfer of tension.

The cured concrete adheres and bonds to the bars and when the tension is released it is transferred to the concrete as compression by static friction.

However, it requires stout anchoring points between which the tendon is to be stretched and the tendons are usually in a straight line.

Thus, most pretensioned concrete elements are prefabricated in a factory and must be transported to the construction site, which limits their size.

Pre-tensioned elements may be balcony elements, lintels , floor slabs, beams or foundation piles.

PRESTRESSED CONCRETE

PRINCIPLE – Using high tensile strength steel alloys producing permanent pre-compression in areas subjected to Tension.

A portion of tensile stress is counteracted thereby reducing the cross-sectional area of the steel reinforcement .

METHODS :- a) Pretensioning b)Post-tensioning

PRETENSIONING :- Placing of concrete around reinforcing tendons that have been stressed to the desired degree.

POST-TENSIONING :- Reinforcing tendons are stretched by jacks whilst keeping them in serted in voids left pre-hand during curing of concrete.

These spaces are then pumped full of grout to bond steel tightly to the concrete.

STEEL BARS BEING STRETCHED BY JACKS

THANK YOU ANKIT KUMAR CIVIL – 6B1