Boulders are mainly used in compound wall work & seashore projects. They could be used for Erosion Control, Security, Storm Water Management, Gabion Baskets, Stream Restoration, Rip Rap (Class I–IV) and Imbricated Rip Rap Shoreline Protection.

40 mm Coarse Aggregates is also known as Blue metal, Jelly Stones or crushed stone. It is the fillers in concrete & acts as one of the load bearers. Coarse aggregates are available in different sizes ranging from 40 mm.

• Jelly 40mm provides strength to composite material.
• 40mm Coarse aggregate are also known as blue metal, jelly.
• 40mm jelly are used in PCC works after earth evacuation.
• 40mm act as filler along with cement and sand.

Jelly Coarse aggregate are an important material used in the production of concrete products, which provides strength to concrete. Coarse aggregate are uncrushed gravel or stone having hard, strong, durable particles, conforming to the specific requirements. Aggregate are upto certain standards for optimum engineering use: they are clean, hard, strong, durable particles free of absorbed chemicals, coatings of clay and other fine materials in amounts that will affect hydration and bonding of the cement and sand mixture.

• 20mm is used for plain cement concrete.
• 20mm is used for slab level.
• 20mm is also be used in PCC works.

20mm Blue Metal is a natural aggregate that is commonly used for drainage in many different fields. Its many uses include backfilling trenches, around PVC and Ag-Pipe, for drainage behind retaining walls and even as a base for concrete and deep garden beds to promote drainage.

20mm Blue Metal is often used for mixing concrete due to its high compressive strength, and can also be a cheaper alternative as a decorative dressing for footpaths and driveways.

• 12mm is used in PCC works.
• Quality protection.
• 12mm acts as filler.

Aggregate can be used in a number of ways in construction. In concrete the aggregate is used for economy, reduce shrinkage and crakes and to strengthen the structure. They are also used in water filtration and sewage treatment processes. The uses of aggregates can be summarized in to the following three categories

• As a Load Bearing Material
• As a Filling Material
• As an Infiltrating Material
• Due to the relatively high hydraulic conductivity value as compared to most soils, aggregates are widely used in drainage applications such as foundation and French drains, septic drain fields, retaining wall drains, and road side edge drains Aggregates are also used as base material under foundations, mainly used in road work for mix with Bituminous laying work & production of Solid & Hallow Blocks, Paving Blocks Etc.

Manufactured sand or M-sand is a substitute of river sand, used in construction industry mainly for concrete production and mortar mix. This is mainly crushed fine aggregate produced from a source material with suitable strength, durability and shape characteristics.

• General crushing of hard stones by using jaw and cone crushers produce poor, weak and flaky particles which are further crushed in Vertical Shaft Impact (VSI) crusher in a wet process to eliminate impurities and silt contents from the manufactured fine particles.

Advantages of M.Sand

• The artificial sand produced by proper machines can be a better substitute to riversand
• The cement quality required will be less and such sand will be more economical
• River sand in many parts of the country is not graded properly and has excessive silt and organic impurities and these can be detrimental to durability of steel in concrete whereas manufactured sand has no silt or organic impurities.
• Presence of other impurities such as coal, bones, shell, mica and silt etc., makes it inferior for use in cement concrete. The decay of these materials, due to weathering effect, shorten the life of the concrete.
• Removing sand from river bed impact the environment, as water tables goes deeper and ultimately dry.
• Using the manufactured sand to full extent as alternative, reduce the impacts on environment by not using river sand.

Key features

• Perennial source of aggregate and msand
• Position in 45 acres rich in mining deposit, with potential reserve of 20 million tones which can serve another 10 years in tindivanam and Pondicherry.
• Site located by a private road through a village to the national highway which is 7km from the site
• 24 hours (include Sunday) delivery system with its own fleet of vehicles
• Environmentally friendly
• Contemporary machinery produces quality aggregate making cement consumption lesser.
• Two crusher machinery of 4 stage jaw, Cone &VSI crusher and sand washing plant
• With aggregate production capacity of 450 ton per hour on an average production per month 1 lakh metric ton.
• Weighbridge available to ensure the quantitative perfection too

Aggregates used are of the smaller sizes, varies between the 4.75 mm to 20 mm sizes and the binders (stone dust or quarry dust having PI (Plasticity Index) not less than 6%) are premixed in a batching plant or in a mixing machine. Then they are brought to the site for overlaying and compaction.

The PI (plasticity Index) of the binding material is kept low because it should be a sound and non plastic material. If the plasticity index is more then there are the chances of the swelling and more water retention properties. So this value should be kept in mind.

Comparison of the WBM and WMM road construction: Although the cost of construction of the WMM is said to be more than that of the WBM sub-base and bases but the advantages given below will compensate for that. Here are the points of difference:

• The WMM roads are said to be more durable.
• The WMM roads gets dry sooner and can be opened for traffic with in less time as compare to the WBM roads which take about one month for getting dry.
• WMM roads are soon ready to be black topped with the bituminous layers.
• WMM roads are constructed at the faster rate.
• The consumption of the water is less in case of the WMM roads.
• Stone aggregates used in WBM is larger in size which varies from 90 mm to 20 mm depending upon the grade but in case of the WMM size varies from 4.75 mm to 20 mm.
• In case of WBM, stone aggregates, screenings and binders are laid one after another in layers while in WMM, aggregates and binders are pre-mixed in the batching plants and then brought to the site for overlaying and compacting.
• Materials used in the WBM are the stone aggregates, screenings and binder material (Stone dust with water) while in WMM material used are only stone aggregates and binders.
• Quantity of the WBM is generally measured in cubic meters while that of the WMM in square meters.

GSB - Granular Sub Base is the layer in road foundation just above the compacted soil layer (the compacted soil layer is called subgrade). SB is widely used in construction of roads. This is a layer granular material in the construction of a road. It acts as sub base for the roads. The suitable materials for this are available in two forms: natural GSB which is obtained from normal stone quarries and crusher run GSB in which stones are crushed in crushers to make GSB.