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prime coata prime coat is the application of a low viscosity binder usually a bituminous emulsion to a gravel wbm or wmm surface to enable the binder
bituminous coursestypes of bituminous coursesthe following are the various bituminous course commonly used a prime coatb tack coatc surface dressingd
wet mix macadamfor heavily trafficked highways the granular bases are constructed using wet mix macadam wmm the wmm is a specification in which well
stone solingone of the early practices in road construction was to provide a stone soling 150-225 mm in thickness the stones are laid by manual
brick pavementin regions where stone aggregates are not available within economical leads bricks provide a cheaper alternative flat-brick or
examples of stabilised pavement layersexamples sand-clay mixture sand-gravel mixture soil-aggregate mixture soil-soft aggregate
stabilised pavement layerssoil stabilisation is the process of treating a soil in such a manner as to alter and improve its properties for use as a
load distribution factorthe formula for deriving at the number of repetitions of the standard axle load during a design period of n years isn 365
design of flexible pavementsthe design of flexible pavements is done by the cbr method the cbr test described further gives an indication of the
construction of embankmentthe following steps describe embankment construction a the ground is cleared and grubbed and all vegetation grass roots etc
borrow pitsborrow pits are the locations from where the embankment soil is obtained the following guidelines govern the location of borrow pits a
desirable characteristics of a pavementin order to fulfill the above function the pavement has to have the following desirable properties a it should
functions and desirable characteristics of pavementsfunction of pavementa pavement is that part of a road on which vehicles travel the pavement has
road pavementspavements constitute an important part of road as they withstand the traffic loads and transmit them to the earthen embankment a study
basic things used in road constructionwater absorption the quantity of water absorbed by aggregatesaggregate impact value the percentage by weight
basic keywords related to road materialssub-grade the portion of road embankment immediately
emulsionan emulsion is a bituminous binder which is in a fluid form at atmospheric temperatures above ooc and requires no heating at all bitumen cab
cutbacks and emulsionscutbacksa cutback is a bitumen whose viscosity has been reduced by adding a diluent such as naphtha or kerosene the use of
tests on bitumenthe following tests are conducted on bitumen to find its suitability as a road binder a penetration testb softening point testc flash
desirable properties of bitumenfor performing as a good binder for road works bitumen should have the following desirable propertiesa when heated to
road binders bitumenbitumen is a viscous semi-solid material dark in color having adhesive properties and derived from the distillation of petroleum
tests on cementthe following tests are conducted on cement in a project sitesetting time initial setting time final setting timecompressive
grade of cementin india the following grades of cement are used for roads ordinary portland cement opc grade 33 grade 43 grade 53portland pozzolana
binders cementcement as a bindercement is one of the main ingredients of concrete when cement sets with the addition of water it forms a paste and
shape and soundness test - testing of aggregatesshapefor providing a good interlock and strength the aggregates should be cubical in shape elongated