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Choosing the Right Driveway Base Material

Thickness Generally 4-8 inches of base material should be used for your sub-base (closer to 4in for well-draining soils and closer to 8in for poor-draining soils) Local contractors should know about how much base material will be needed for your specific area The Get price


Soil Compaction Handbook

create a downward force in addition to the machine's static weight The vibrating mechanism is usually a rotating eccentric weight or piston/spring combination (in rammers) The compactors deliver a rapid sequence of blows (impacts) to the surface thereby affecting the top layers as well as deeper layers Vibration moves throughGet price


Caltrans Specifications for Aggregate Base and Subbase

Please refer to the appropriate specification for the requirements the material must meet for use The following specifications can be found on the Caltrans Construction Contract Standards webpage 2010 Standard Specifications allowed up to 100 percent use of recycled aggregate for both base and subbase Get price


Technical Information Sheet CLASS 2 3 CRUSHED ROCK

Technical Information Sheet CLASS 2 3 CRUSHED ROCK Class 2 Crushed Rock Class 3 Crushed Rock Application Road base materials Road base/sub base material hard stand areas under concrete slabs bedding material and backfilling Available Dry wet mix or stabilised Dry wet mix or stabilised Loose Density (natural) (approx) 1 65 t/m3 1 65 t/m3Get price


Bases and Subbases for Concrete Pavement

Bases and Subbases for Concrete Pavements 0 10 20 30 40 Romans (200 AD) Telford (Early 1800s) Macadam (Early 1800s) Base/Subbase Thickness (in) Early 1900s Typical Base/Subbase Thickness (Early European Designs) Figure 2 Graph Base and subbase thickness for early roads Get price


Sub base stone mot and scalpings calculator

Sub Base Estimator This form will calculate the approximate metric tonnes of unconsolidated DTp1 required for the entered area Please enter the dimensions in the white fields below The calculations will be completed when you leave the last input field Get price



there is a very high degree of correlation between the densities obtained from the impact methods and the vibratory method where the subbase materials are vibrated at 0 030-in amplitude and a surcharge pressure of 1 psi is applied estimating equations are developed for predicting maximum density of subbase material from the vibratory test data Get price


Subbase (pavement)

Subbase (pavement) The thickness of subbase can range from 75 to 100 mm (3 to 4 in) for garden paths through 100 to 150 mm (4 to 6 in) for driveways and public footpaths to 150 to 225 mm (6 to 9 in) for heavy used roads and more for highways Low quality subbase material including large pieces of Get price


302 Section 300 BASES AND SUBBASES

Option A Subbase construction consisting of two (2) separate layers of Type 4 and Type 3 Subbase Course Option B Subbase construction consisting of a single layer of Type 1 Subbase Course Option C Subbase construction consisting of a single layer of Type 2 Subbase Course Get price



subbase material shall be processed in a central or travel mixing plant The subbase material together with any blended material shall be thoroughly mixed with the required amount of water After the mixing is complete the material shall be transported to and spread on the underlying course without undue loss of the moisture content 3 7 Get price


Reclaimed Asphalt Pavement

The unit weight of milled or processed RAP depends on the type of aggregate in the reclaimed pavement and the moisture content of the stockpiled material Although available literature on RAP contains limited data pertaining to unit weight the unit weight of milled or processed RAP has been found to range from 1940 to 2300 kg/m 3 (120 to 140 lb/ft 3 ) which is slightly lower than that of natural aggregates Get price


CW 3110 SUB

2 MATERIALS 2 1 Sub-Base Materials 1 Sub-base material of the type(s) shown on the Drawings or indicated in the Specifications will be supplied in accordance with the following requirements 1 Suitable site sub-base material will be of a type approved by the Contract Administrator Get price


Densities for Use in

Crushed HMA for use as Subbase 127 pcf — — 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 pcfGet price



The subgrade is the foundation of the pavement structure on which the subbase is laid down The load-bearing strength of subgrade is measured by California Bearing Ratio (CBR) test falling weight deflectometer backcalculations and other methods See also Subsoil Track bed ReferencesGet price



Section 208 02—Materials is replaced with the following (a) Subbase material may consist of any mixture of natural or crushed gravel crushed stone or slag crushed hydraulic cement concrete (CHCC) natural or crushed sand with or without soil mortar Subbase material may be Get price



Where the subgrade IBV was 3 or greater the control material was 12 inches of CLS CA-6 Type B Where the IBV was less than 3 the control material was PCR capped with CLS CA-6 where the total aggregate thickness corresponded to the recommendation in the Get price


Unit Weight of Materials Used at Construction Site

Following table shows unit weight of materials used at construction site Please note this is for reference purpose only and may vary from place and type of material Advertisements We are thankful to Engineer Ravi Verma for submitting this very useful information to us Get price



Jul 18 2019C Granular materials for sub-base shall meet the requirement of class A or B as shown in table 3 1 2 when tested in accordance with AASHTO T-27 after dry mixing and just before spreading and compacting The class of granular material to be used shall Get price



Discover with Our Concrete Asphalt and Aggregate Calculator Figure out how much material is needed for your project with our concrete flatwork concrete column asphalt and aggregate calculator Please note that these calculators should be used for estimates only Actual material requirements may differ based on job site specific conditions Get price


Soil and Rock

Soil and rock expansion - or swell - after mining Sponsored Links Soil or rock from the borrow expands when dropped on the lorry or the landfill - or stockpiled One cubic from the borrow does not translate to one cubic dump Bulking or swell factors for some materials 1 kg/m3 = 0 0624 lb/ft3 Get price


Subgrade and Subbase for Concrete Slabs

4 Subbase for Concrete Slab Subbase is a layer of gravel which is fairly cheap material placed on top of subgrade The subbase placement is optional and it serves as a work platform for construction of the slab and provide more uniform support for the slab As the thickness of subbase increases the ultimate load carrying capacity of slab Get price


Aggregate Base Course

The thickness of sub-base can range from 1 to 2 inches on light weight traffic areas like pathways and paver patios above the sub-grade when a ABC is not required ABCM Aggregate Base Coarse is a hard pack sub-base compaction material Contains a mix of crushed stone topsoil and dust Get price


CW 3110 SUB

2 MATERIALS 2 1 Sub-Base Materials 1 Sub-base material of the type(s) shown on the Drawings or indicated in the Specifications will be supplied in accordance with the following requirements 1 Suitable site sub-base material will be of a type approved by the Contract Administrator Get price



PART 2 - PRODUCTS 2 1 MATERIAL A Aggregate base course shall consist of crushed gravel or crushed stone conforming to the quality requirements of AASHTO M 147 The aggregate shall be free from lumps balls of clay or other objectionable matter and shall be durable and sound Get price


4 Aggregate Specifications and Requirements

AASHTO T 85 defines absorption as the increase in the weight of aggregate because of water in the pores of the material but not including water adhering to the outside surface of the particles Absorption is expressed as a percentage of the dry weight Absorption requirements are of concern onl y regarding aggregates used in hotGet price



1 1 1 3 Weight The tonnage of [subbase] [and] [select-material subbase] [or] [rigid pavement base] course material will be the number of metric tons tons of aggregate [placed and accepted in the completed course] [plus the amount] [placed in authorized Get price


Where do you need to use a subbase?

The need for a subbase - a layer of granular material placed on a prepared subgrade - depends on the frequency of heavy truck loadings While mandatory for major highways a subbase is seldom required for light-duty concrete pavements Performance studies and surveys have shown the conditions for which a subbase is or is not required Get price


Material Weight by Volume

The exception is the Metals table since there is seldom much variation in weight between different batches of the same metal I have given the weight per cubic metre reasonably accurately Weights in lbs/ft 3 have been calculated at 1/16 kg/m 3 and rounded out to the nearest pound which should be accurate enough for roleplaying purposes Get price



Hence where a specified material is not available at the time of construction or within the region it may be substituted by a higher Traffic Category material or a Subbase material may be substituted by a Base material However higher standard materials can be expected to be more expensive Get price



Base and subbase materials were sampled from three regions in that state and evaluated under the following performance tests permeability (falling and constant head conditions) triaxial shear strength cyclic triaxial loading California Bearing Ratio (CBR) andGet price


5 Aggregate Specifications and Requirements

Non-durable particles are divided into two types soft materials as determined by ITM 206 Scratch Hardness and structurally weak material as determined by visual inspection Coke and Iron Coke and iron are of concern only with the slag materials Coke is an ingredient in the iron making process Slag from these furnaces normallyGet price

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