GRANULAR SUB BASE CONSTRUCTION

2020-5-24 · If the thickness of the granular sub base layer is less than or equal to 200 mm. Both drainage and filter layers can not be provided separately ( considering the minimum thickness requirements as per 7.2.2). For such cases, a single drainage-cum-filter layer with GSB gradation Ⅴ or Ⅵ of MoRTH specification may be provided.

Granular sub base

2020-4-9 · Granular Sub Base is laid below the Base layer and above the Subgrade layer. The material used in sub-grade is Natural sand, moorum, Gravel, crushed stone, crushed slag. Use of materials like brick material, kankar and crushed concrete shall be permitted in the lower sub Base. Natural sand can not fulfill the grading requirement of granular sub ...

Granular Sub Base Construction And Quality Control ...

2021-10-1 · 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. GSB or granular sub-base prevents capillary water from rising; its particle size is so designed that the capillary action stops and cant go ...

What is the difference between Granular ...

2020-5-22 · Granular Sub Base (GSB) Agg are used below base coarse & above subgrade layer is known subbase layer, due to granular crushed agg its called granular subbase. Functions. GSB act as a load bearing & strengthing component of pavement. GSB reducing to stresses applied on subgrade layer. GSB providing drainage for pavement.

Granular Base

2020-4-9 · Granular Sub Base is laid below the Base layer and above the Subgrade layer. The material used in sub-grade is Natural sand, moorum, Gravel, crushed stone, crushed slag. Use of materials like brick material, kankar and crushed concrete shall be permitted in the lower sub Base. Natural sand can not fulfill the grading requirement of granular sub ...

Application Description

Granular sub base : Its function, requirements, its sources etc

Granular B Type II

Granular B Type II. Product Details. Size: Particles range from dust size to less than 106mm. Description: Well-graded product meeting provincial specifications (OPSS 1010). crushed quarried rock. Use. Granular sub-base material typically underlaying …

Granular Sub-base (GSB)-Specification ...

2020-8-18 · Granular Sub Base. Granular Sub-base (GSB) consists of laying and compacting well graded material on prepared sub-grade in accordance with the specifications.: GSB layer is intermediate layer in between Sub-grade and Wet mix macadam. GSB layer is laid in …

Repetitive triaxial compression of granular base course ...

2018-8-14 · University on the properties of granular base course material. The study is centered around two crushed limestones that are representative of the material currently used in the state for granular base con­ struction. Initial work has indicated that these have basically the same strength characteristics as determined by the conventional triaxial

MOT Type 1 Granular Sub Base

The perfect sub base for constructing roads, footpaths, driveways, carparks, laying paving or creating hard standing areas. MOT Type 1, also known as DOT Type 1, named after the Department of Transport (DOT) specification for granular sub base material, is the most widely used and approved sub base in the construction industry.

Estimation of resilient modulus of unbound granular ...

2016-1-9 · The resilient modulus of granular materials used in base layers is influenced by numerous factors, such as grain-size distribution and aggregate source properties. Resilient modulus tests were performed on three aggregate sources for five identical gradations in order to study their respective effects on the mechanical response of granular materials. To consider these effects, two new ...

Granular-Sub-Base (GSB), Concrete Materials ...

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. The quality of subbase is very important for the useful life …

OPSS 501.05 MATERIALS OPSS 501.05.01 Granular ...

2017-11-2 · granular base and subbase pavements, curbs, sidewalks, boulevards and utility cut restorations SPMDD . The frequency and locations of compaction testing for quality assurance are as follows: One test per 0.3 m of testing for each increment or fraction of 150 linear metres of backfill for

Laboratory Studies on Granular Sub Base

2019-7-1 · The Granular Sub Base (GSB) layers are used in the flexible pavements to provide a stress-transmitting medium to spread the surface wheel load to a large area so as to prevent the shear and consolidation deformations. Besides these layers are also acting as drainage layer so that capillary ...

Technical Specifications for Granular Sub Base …

 · Jan 27, 2018. #1. GRANULAR SUB-BASE. SCOPE. This work shall consist of laying and compacting well-graded material on prepared subgrade in accordance with the requirements of Specifications. The material shall be laid in one or more layers as …

Experimental and analytical ...

2019-1-1 · In particular, the dynamic behavior of granular base course materials used for China''s HSRs subjected to combined actions of cyclic loading and freeze-thaw (F-T) cycles has attracted much attention. In this study, a series of cyclic triaxial tests were performed to investigate the characteristics of granular base course materials.

Granular Base

Granular Base INTRODUCTION. Aggregates are used in granular base and subbase layers below the driving surface layer(s) in both asphalt concrete and Portland cement concrete pavement structures. The aggregate base layers serve a variety of purposes, …

Granular subbase and equipments used for its ...

2016-11-5 · Granular Sub-Base layer is watered to Optimum Moisture Content and then it is compacted by rolling. If the compacted thickness of the layer is 100mm or lesser, an ordinary smooth wheeled roller is used. For compacted thickness exceeding 100mm, compaction is done by Vibratory roller of static weight 10 tons or more. Rolling is done starting from ...

granular data

1-2.9 Lift Charge (Propellant) – Unpressed granular chemical composition, consisting of black powder or equivalent, which is used to propel one or more [...] visible or audible aerial effects into the air.

SECTION 9 – AGGREGATES AND GRANULAR MATERIAL …

2020-8-19 · (ASTM D1557) on all materials supplied to the project to be used for subgrade, sub-base and base course construction. (c) Field moisture content and compaction determined by a minimum of one field density test of sub-base, and granular base per 500 m

Material Layer Coefficients of Unbound Granular …

From the relatively large data base that was generated from the study, the following specific objectives were studied in the project: 1. To determine from laboratory resilient-modulus results, typical resilient-modulus relation­ of granular base and subbase materials used by test ships MSHA, 2.

Granular Material-Sub-Base Course Materials

The Materials shall consist of sand, gravel or a sand-grave mixture obtained from the source or sources, The sub-base material as finally graded and compacted to the correct profile on the subgrade shall comply with the following requirements:- Coarse Aggregate (that retained in 2mm (No. 10) sieve).

Application Description

2016-3-8 · Aggregates are used in granular base and subbase layers below the driving surface layer(s) in both asphalt concrete and Portland cement concrete pavement structures. The aggregate base layers serve a variety of purposes, including reducing the stress applied to the subgrade layer and providing drainage for the pavement structure.

Laboratory Studies on Granular Sub Base

2014-6-5 · The Granular Sub Base (GSB) layers are used in the flexible pavements to provide a stress-transmitting medium to spread the surface wheel load to a large area so as to prevent the shear and consolidation deformations. Besides these layers are also acting as drainage layer so that capillary water cannot rise above the GSB layer.

Determination of AASHTO Layer Coefficients for Granular ...

2021-8-19 · Eq. 4 can be used by the designer to approximate E b of granular material which is functioning either as a base under an asphalt layer or as a subbase under an asphalt surface layer and a bituminous base layer. If the latter is the case, E 1 should represent a combination of the two asphalt bound layers as follows: ( ) 0.333( ) 3 1a 1a 1b 1b eq ...

Grading for Granular Sub-base Materials (GSB) (Grading ...

A sieve analysis (or gradation test) is a practice or procedure used to assess the particle size distribution (also called gradation) of a granular material by allowing the material to pass through a series of sieves of progressively smaller mesh size and weighing the amount of material that is stopped by each sieve as a fraction of the whole mass.

Physical and Compaction Properties of Granular ...

Granular materials in geotechnical engineering is generally considered to be mixtures of clay, sand, and gravel that commonly appear in slopes, valleys, or river beds, and they are especially used for the construction of earth-rock-filled dams. The complexity of the constitution of granular materials leads to the complexity of their properties. Particle size distribution (PSD) has a great ...

Section 02721 GRANULAR BASE COURSE Page 1 of 4

2020-3-12 · Granular base course higher than the approved grades shall be cut to the required grades. Prior to hot mix applications a prime coat shall be placed on the finished final lift of base course in accordance with the requirements of Bituminous Prime and Fog Coat. Streets, roads, and lanes used for hauling material, that are damaged, shall

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