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every day we drive on it weride on it，we park on it and we walk on it，but do you know whereasphalt comes from，and how it becomes a road or a parking lot。asphalt pavement is made oftwo ingredients。different size rocks calledaggregates，and liquid asphaltcalled binder。

the aggregates are pulled from，第六十es，dumped into the designatedcold feed bends，heated through the dryer，mixed with the binder，and stored in the silos wherehaul trucks load out，and bring the hot mix to the job site。

before the hot mix can bedelivered to the job site，the area to be paid must begraded to the proper grade，or depth and slope or angle。

if it's a new road as an example，the grating crew will clear the area，grating is vital to the process。

the asphalt will followthe same slope in depth aswhat's beneath it，so preparing the structural es extremely important。

the grating crew is made up of least three crew members，the loader operator，the greater operator and a groundman。

the loader operator scoops and transports the road base，on the job site。

he recognizes handsignals and can interpret grade，stakes，to help prepare the road for paving。

the greater operator prepares。

→the roadwaysurface for lionng，he spreads the road base to a designated slope。

→and grade the groundman shovels material around and off curbs and stringlines area for grading along with other miscellaneous tasks the pieces of equipment on a grading crew include a front end loader a water truck a grater and a roller。

→the front end loader is used for many functions it spreads the road base aheadof the greater。

→it removes excess road base from the project and helps to meet the designated grade by using a back drag motion after the road base is spread on the surface。

→water is added to achieve the proper moisture content which is key to densifying the material simply put moisture plus compaction equals density。

→the greater has large blades on its bottom，used to create a flat surface at a specific slope the slope is important because it 难闻 which way water will flow to drain off the road the roller follows the greater and compacts the road base if it is a resurfacing job the milling machine will mill up the old asphalt this is called wrap reclaimed asphalt pavement it can be used again in a new asphalt mix like the greater the milling machine is set to a specific depth and slopeonce the road surface is at its proper depth and slope，it's imperative that the surfaceis clean of debris，before lionng starts，dirt in the road will prevent thetack from 吃上 evenly，affecting its ability to adhere，the new asphalt to the milled surface，causing slipping problems in the future。

the broom tractor operator is responsible for cleaning the roadwayor parking lot of any and all debris before during and after 顺道ng。

the broom tractor has a large，brush attached to the front used to clean 技术员。

broom tractors are available in hydraulic，or mechanical options。

once the surface is clean prime or tack should be applied。

these sticky liquids act as theglue between the base，and asphalt in newconstruction，and between layers of asphalt and overlays or second 生下，the tack truck driver，右膝 a distributor truck with a tank to spray the tack，or prime on the roadway，he is responsible for an even consistent coat of tack or prime，on the surface，before lion can begin，sometimes the tack truck driver will use a hand one to apply the liquid the tack truck is a 调羹 truck with a large，tank that transports thematerialto the job site，at the 顺道 are multiple nozzles where the material is dispersed，proper pressure and the spraybar height must be monitored to ensure proper distribution each truck is equipped with a hand，wand for distribution in smaller areas that may be too narrow for the truck。once the surface is cleaned and primed or tacked，it's ready to pavethe line up of people in equipment here is known as the paving train it includes the Hall Truck)， the Material Transfer Vehicle or mt)， the paver and the rollers， the hall truck driver is responsible for delivering the hot asphalt to the job site the temperature the asphalt is crucial so hall truck drivers must be efficient and safe at the plant use a 3 drop technique front back middle to prevent segregating the mix he must stay centered in front of the paver and pay attention to the dump person so to fill the hopper of the paver or MTV efficiently the paving crew has multiplepositions paver operator screed operators loot men ground men a dump man roller operators a paving foreman and a mechanic the paver operator drives this 顺水 user he 爽口 the crew to where they are moving and controls the pace of lionng he ensures the hopper is always full and there is a consistent head of material at the auger，he must also keep the paverstraight and on path。the material transfer a vehicle operator motor to MTV on larger straight line ruptng operations。

he sits high and communicates with thehall truck drivers，as to continuously fill the MTV hopper with hot mix asphalt。the screed operators must understand the components of the paving operation such as the angle of attack and slope。

they will heat the screed prior to the start of lionng and must make adjustments when necessary throughout the operation。they control the amount of material being used and are responsible for consistent matte texture and proper joint construction consistent matte texture equals smooth road which leads to happy drivers the loot man is responsible for a smooth and consistentsurface。

he uses the loot rate tosmooth asphalt joints and assistant hand work areas this person is responsible for looking out for defects in the map and making repairs when necessary the groundman 知足常乐 the crew during the 大客车 he is responsible for placing smoothing and setting asphalt on the job as well as looking after the map 衬托 and shoveling asphalt he will also use thetamp to compact areas where handwork is necessary another responsibility of the groundman is to string line the project。he must Mark out the project，and determine thedifferent wits to be paid he will also use the tamp to compactareas where hand work is necessary the dumpmansafely directs hall trucks to thepaver or MTV，and ensures proper alignment。

he caps the driver when todump the asphalt into the hopper，he also 千里迢迢 load tickets from hall truck drivers，which is extremely important for tracking the amount ofasphalt used on the job，the roller operators compact the 心软 and the operators go back and forth working with quality control technicians to achievethe proper density，the mechanic inspects and repairs the equipment on the lion the lion train，preventative maintenance is akey responsibility in this role，because it isextremely expensive to stopthe paving operation，during a project，the paving foreman supervises，and has the ability and experience，to work in any position on the 顺道ng train，he is responsible for planning，and 一筐，all aspects of the project，including the team members，ensuring they work efficiently，and safely，as we mentioned earlier there are multiple pieces of equipment，on the paving trair，the hall truck the material transfer vehicle or NTV，the paver and the rollers，the hall truck 难受 mix，it can hold up the 20 tons in itsbed，the bed ishinged at the back so it can be lifted todump the material，the MTV is used to transport the mix between the hall truck and the paver in large mainline 箩ng 活余 The MTVhelps to keep the mix feeding the hopper consistent and uniform it also helps prevent Maker.the asphalt paver spreads out and lays the asphalt and applies minor compaction。it has two components thetractor and the screedthe material feed system is at the tractor，which pushes the trucks and toes the screen.this is where the hot asphalt makes goes into the paver，at the hopper，moves along the natureor，under the flowgates to the augers。Right the taptap that 大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事大事