What is difference between GSB and WMM?

The prime work of GSB is drainage system and secondary to support the load transfer to the sub-grade. WMM is a part of designed road section, thickness arrived from design calculations to withstand design load and ultimate transfer to sub0grade.

What is WMM and GSB?

WMM = Wet Mix Macadam (40 mm down aggregates, mix design required) GSB = Granular Sub Base (63 - 40 mm aggregate or 70mm down aggregates) SR = Soil Replacement (preferably quary materials)

What is difference between GSB and wet mix?

The GSB is granular sub base and WBM is water bound macadum. The GSB is used as sub base course and it also works as filter media,as it contains coarse sand and shingle. The. WBM is used as base course and it contains stone metal mixed with binding material.

What is the use of GSB?

GSB or granular sub-base prevents capillary water from rising; its particle size is so designed that the capillary action stops and cant go beyond GSB layer. Secondly, it works like a drainage layer where water can pass without damaging other road layers.

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.

Warehouse Management System(WMS)

What is the ratio of GSB?

GSB material is a mix of sand & gravels, crushed stone & broken rock. GSB material typically contain crushed stone > 50%. Material having CBR > 30% & PI < 6%. Water absorption < 2% & Agg impact value (AIV) < 40%.

What is the size of GSB?

While the gradings in Table 400-1 are in respect of close-graded granular sub-base materials, one each for maximum particle size of 75 mm, 53mm and 26.5mm, the corresponding gradings for the coarse graded materials for each of the three maximum particle sizes are given at Table 400-2.

What is WMM material?

Wet Mix Macadam(WMM) work includes laying and compacting clean, crushed, graded aggregate and granular material, premixed with water, to a dense mass on a prepared GSB layer or existing pavement as per the requirement of the project.

How many types of GSB are there?

Out of six GSB grades Grade III, Grade IV, Grade V and Grade VI obtained permeability values are more than predicted values. AASHTO-57 Grade obtained permeability is around 17%less than predicted value, for Grade I & Grade II no flow of water is observed so values are less than predicted value.

What is difference between BM and DBM?

Bituminous Macadam (BM)

The void content is 20 to 25% higher than the dense graded bitumen (DBM). The DBM have a void content of 3 to 5%. The BM have high potential to attract water and moisture.

What is the meaning of GSB in road construction?

Get Latest Price. Granular-Sub-base is often the main load-bearing layer of the pavement. Its role is to spread the load evenly over the subgrade. The materials used may be either unbound granular, or cement-bound.

What is PQC in road construction?

Pavement Quality Concrete (PQC) is normally employed for providing a strong surface of rigid pavements. PQC is also used for construction of runways in airports in order to distribute the heavy impact load from wheel to sub- grade layers [1].

What is the thickness of WMM?

Wet Mixed Macadam (WMM) Base thickness of single compacted should not be less than 75 mm. WMM shall be laid in layers of 75mm or 100mm as per thickness.

What is the size of WMM?

The consumption of the water is less in case of the WMM roads. 6. 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.

What is GSB in crusher?

The site is far from any quarry and cost of transportation of crushed stone for GSB (Granular Sub-base) was huge. MB crusher bucket was an attractive proposal for the customer: crushing the stone directly at site. immediately re-using. save a huge amount of transportation costs.

What is the tolerance of GSB?

Specified tolerance in subbase GSB – (±) 6 mm. One measurement per 1000 m2 and minimum 6 per section. 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 the function of WMM?

WMM maintains the priority of audio, video and voice, over other applications which are less time critical. Using QoS (Quality of Service) Wi-Fi Multi-Media (WMM) ensures that the applications that require better throughput and performance,are inserted in queues with higher priority.

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.

What is the density of GSB material?

MDD of the GSB material is found to be 2.1 g/cc at an OMC of 3.3%.

What is the mix design of GSB?

The material to be used for the work shall be natural sand, crushed gravel, crushed stone, crushed slag, or combination thereof depending upon the grading required. Use of materials like brick metal, Kankar and crushed concrete shall be permitted in the lower sub-base.

What is GSB stone?

GSB ( Granular Sub Base ) Crushed Stone Aggregate.

What is wet mix?

Definition of wet mix

: the mixture obtained when water is added to cement, sand, and coarse aggregate.