what is granular sub base material

What is the minimum CBR values for a subbase layer of …

CBR value of the Subgrade / Sub-Base is also a data needed to finalise the thickness of the pavement. When the strength of the subgrade is too low, other means like introducing Geotextiles, ground treatment / improvements also have to be thought of.

Paving Expert - AJ McCormack and Son - Sub-bases

Unbound Granular Materials DTp Type 1 Granular sub-base The name refers to Dept. of Transport specifications. The full title is "Type 1 granular sub-base to the Department of Transport Specification for Highway Works" It is still referred to as MOT1 (the old Ministry of Transport) or even the more inaccurate "40mm to dust".

Chapter Three - Granular Base and Subbase Construction ...

Washington, DC: The National Academies Press. doi: 10.17226/22469. × Save. Cancel. Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the ...

Densities for Use in - Iowa Department of Transportation

Base Course . 145 pcf 155 pcf : 150 pcf . Intermediate Course 147 pcf 155 pcf 150 pcf Surface Course 147 pcf 160 pcf 155 pcf . The following densities should be used for estimating quantities of granular material. Table 2: Granular Material Densities . Material English. Granular Subbase . 135 pcf Granular Backfill 125 pcf Granular Blanket 125 pcf Granular Shoulders 140 pcf Special Backfill ...

What materials are used for road construction? - Quora

The sub-grade material should be clean and free from organic matter and should be able to be compacted by roller, to form stable sub-base. The material should have the following characteristics: It is layer of granular material provided above sub-grade generally natural gravel. It is usually not

Material Definitions | Steed and Evans Limited

Granular material consisting of rounded, water-worn rock fragments 2 mm to 75 mm in diameter, usually found intermixed with sand. Or a mix of stone, sand and fine sized particles used as sub-base, base or surfacing on a gravel road. In some regions, it may be called aggregate.

Granular Bases and Subbases - Industrial Resources Council

Granular Base and Subbase : Introduction. Placement of tire shreds during road construction. In a pavement structure, the granular base and subbase are compacted aggregate layers between the asphalt concrete or the Portland cement concrete pavement layers and the underlying subgrade material. The base is the load bearing layer immediately below the pavement layers, and serves to …

MATERIAL SPECIFICATION FOR AGGREGATES - BASE, SUBBASE ...

This specification covers the material requirements for aggregates for use in base, subbase, select subgrade, granular surface, shouldering, and backfill material.

Type 1 subbase density - Materials Man - Construction ...

I can see the searches people put in to reach my site, and a recurring one is "density of type 1 subbase". So in my humble option you should use 2.1 / 2.2 t/M3 for aggregate that has a relative density of 2.7 / 2.8 t …

SECTION 3: SUB BASE AND BASE COURSES

A. Granular material for use in sub-base courses shall be a naturally occurring gravel, blended as necessary with fine or coarse material and screened to produce the specified gradation.

Walker Industries Inc

Also referred to as Granular "B", this is a minus 50mm (2″) well graded crushed material that can be compacted. 50mm (2″) crusher run acts as a sub-base material for roads and parking lots. 50mm (2″) crusher run acts as a sub-base material for roads and parking lots.

Subbase vs. Base (AASHTO Design Guide) - Road and …

2010-07-22· The granular Subbase is supposed to be a lower quality material than the granular base. If I refer to the "1993 AASHTO Guide for Design of Pavement Structures" to obtain the layer coefficients, I …

GENERAL SPECIFICATION FOR CIVIL ENGINEERING WORKS …

2006 Edition 9.3 SECTION 9 CARRIAGEWAYS: SUB-BASE MATERIAL AND BITUMINOUS MATERIALS GLOSSARY OF TERMS Nominal maximum aggregate size 9.01 Nominal maximum aggregate size is the smallest BS sieve size for which

Granular Sub Base - Newfoundland and Labrador

Granular sub base material to Section 31 05 16 - Aggregate Materials and following requirements: Crushed pit run or screened stone, gravel or sand. Granulations to be within limits specified when tested to ASTM C136 and ASTM C117 - sieve sizes to CAN/CGSB-8.1.

Granular A » WW Siegel Sand and Gravel

Granular A is a compactible material consisting of a mix of sand and stone. When should I use Granular A? You should use Granular A for sub-base, such as under patios and walkways, for mixing concrete, and for topdressing driveways.

Proper Subgrade Prep| Concrete Construction Magazine ...

Vibratory plates are good for compacting granular materials because they are fast and leave the surface flat. A flat, smooth surface is good for flatwork because the concrete can shrink as it cures without being restricted by the base material.

GRANULAR SUB BASE-GSB.docx - scribd.com

GRANULAR SUB-BASE. Description Granular sub-base is a graded mixture of different size of Aggregates, stone dust, silt, soil, and water. GSB work shall consist of …

Subbase (pavement) - Wikipedia

In highway engineering, subbase is the layer of aggregate material laid on the subgrade, on which the base course layer is located. It may be omitted when there will be only foot traffic on the pavement, but it is necessary for surfaces used by vehicles.

Subbase or Subgrade: Improving Soil Conditions

Subbase materials preferably might consist of naturally occurring, coarse-grained soils or blended and processed soils. When possible, avoid using materials which have more than 15 percent fines. Lift thickness is dependent on the type of material, the compaction …

Sub Base Material - YouTube

2010-07-07· Delivery of sub base material for the Interlocking pavement installation.

Application Description - Granular Base - User Guidelines ...

Aggregates used in granular base and subbase applications generally consist of sand and gravel, crushed stone or quarry rock, slag, or other hard, durable material of mineral origin. The gradation requirements vary with type (base or subbase).

MATERIAL SPECIFICATION FOR AGGREGATES - BASE, SUBBASE ...

Granular A means a set of requirements for dense graded aggregates intended for use as granular base within the pavement structure, granular shouldering, and backfill. Granular B means a set of requirements for well-graded aggregates intended for use as granular subbase

August 2015 No. 900 SPECIFICATIONS FOR AGGREGATE FOR ...

Supplementary granular material for use in Class "A" and Class "B" granular base course shall be stockpiled separately and added uniformly to the pit material by means of a belt type conveyor immediately prior to entering the crusher.

TB011P - Minnesota Department of Transportation

The material quality requirements for a subbase are not as strict as those for a base since, under concrete, the pressures imposed on this layer due to vehicle loadings are much lower than those under asphalt. Subbases may be constructed of granular materials, cement-treated materials, lean concrete, or open-graded, highly-permeable materials, which may be stabilized or unstabilized. For …

SECTION M.02 GRANULAR FILL SUBBASE GRANULAR BASE AND ...

M.02.03--Granular Base, Rolled Bank Gravel Surface and Traffic Bound Gravel Surface: The materials for the "Rolled Granular Base" shall consist of sound, …

Subgrades & Subbases for Concrete Slabs - The Concrete …

Base (or base course)—this is the layer of material on top of the subbase and directly under the slab A compacted subbase keeps workers out of the mud. Energy Efficient Building Network

Standard Specification for Materials for Soil-Aggregate ...

This specification covers the quality and grading of the following materials for use in the construction of subbase, base, and surface courses: sand-clay mixtures; gravel; stone or slag screenings; sand; crusher-run coarse aggregate consisting of gravel, crushed stone, or slag combined with soil

CW 3110 SUB-GRADE, SUB-BASE AND BASE COURSE …

.2 Sub-base – where required, the layer of material provided between the sub-grade and the base course. .3 Base course – the layer of base course material, greater than 50mm in depth, immediately