What is maximum dry density of GSB?

The maximum dry density of Granular Sub Base used in Road Construction must be 2100 Kg/Cum. The maximum dry density of Wet Mix Macadam used in Road Construction must be 2230 Kg/Cum.

How do you find the loose density of a GSB?

Subtract the pail empty weight on the bucket from the filled pail weight to obtain the weight of the material in the pail. Multiply the weight of the material in the pail by 27. Divide the answer in #6 by the volume of the pail (recorded on the pail) to obtain the material density in lbs./cubic yard or kg/cubic meter.

What is the density of coarse aggregate?

The coarse aggregate density used for construction is generally between 1450 – 2082 kg/m3 The density of coarse aggregate varies depending on the source, nature, and condition like wet or dry.

What is MDD in GSB?

3.2 Optimum Moisture Content To know the OMC of the soil –aggregate mix to get the maximum dry density the test is conducted on the CBR mould itself to get the required OMC and Maximum Dry Density (MDD) for the different grading. 1.

What is compaction factor of GSB?

Specified compaction for GSB – 98 % of MDD (MDD by IS 2720 Part – 8). There is a possibility of getting a higher compaction which results normally upto 104% due to the presence of coarse crushed material.

What is GSB material?

Granular Sub Base(GSB) is natural or designed construction material, used for road construction as a sub-base layer. Granular Sub Base is a layer in road foundation just above the compacted sub-grade layer.

Is GSB a code?

Grading for Granular Sub-base Materials (GSB) (Grading – IV) IS:2386 (Part-I)

What does 95% compaction mean?

95% compaction means that the soil on the construction site has been compacted to 95% of the maximum density achieved in the lab. It means that when you conduct compaction test(in the laboratory) on a small soil sample of a particular site. You get some value of maximum dry unit weight at certain moisture content.

What is MDD test?

Compaction testing in the laboratory is conducted for various reasons, but generally is it to determine for a pavement or earthwork material sample the Optimum Moisture Content (OMC) and Maximum Dry Density (MDD) or Maximum Wet Density (MWD). These tests are generally referred to as Proctor tests.

How do you find MDD?

This can be measured by mainly two methods Standard Proctor Compaction Test and Modified Proctor Compaction Test. Both the tests help to determine the optimum moisture content that is required for soil to attain maximum compaction i.e maximum dry density for performing construction.

What is density of crush sand?

Their specific density is 2,857 kg/m3, and specific surface area 310 m2/kg.

What is density of coarse aggregate 20mm?

20 mm aggregate density:- density of 20 mm aggregate is 1550 kg/m3, it means 1 cubic metre of 20 mm aggregate weight is 1550 kg.

What is the weight of 20mm aggregate?

1 cft 20mm coarse ggregate weight in kg

And we know that 1 cubic metre is equal to 35.3147 cubic feet, it means 35.3 147 cubic feet of aggregate weight of 20 mm size is equal to 1550 kg, weight of 1 CFT (cubic feet) of 20mm size aggregate is 1550/35.3147= 43.89 kg.

What is minimum thickness of GSB?

➢The recommended minimum thickness of granular base is 225 mm for traffic upto 2 msa and 250 mm for traffic exceeding 2 msa.

What is the full form of GSB?

The Full Form GBS is Granular Sub-Base.

Granular Sub Base(GSB) is natural or designed construction material, used for road construction as a sub-base layer. Granular Sub Base is a layer in road foundation just above the compacted sub-grade layer.

How do I check my GSB compaction?

CBR TEST For the CBR test, Compaction was done in 5 layers with 56 blows for each layer as per the requirements. In case of combined layer composition (for type II, type III and type IV), GSB layer is compacted first for a corresponding volume before sub-grade soil. After compaction, the mould is reversed.