Tag: road construction

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Road Construction Safety

Safety Rules of Road Construction Project

These safety rules of road construction project should be taken as conditions of employment. Every effort ought to be designed to convince the men that they are for his or her personal protection. If this should fail the safety rules ought to be enforced.

  • The first  safety rule of road construction  is barriers and/or signs should be erected and safety comes and stop/go bats were designed as  set  out  in  the  “Provision  for  Traffic”  specification  to  avoid  injury  to  workers  by passing vehicles and also the traveling public.
  •  Substantial  safety  rails,  securely  bolted,  are  to  be  erected  in  all  cases  where  it  is considered  necessary  to  provide  protection  for men against contract with, proximity to, falling previously mentioned onto or into machinery or harmful substances, or injury because of height of fall.
  • The important safety rule for road construction work should be that approved  safety  guards  are  to  be  fitted  to  all  items  of  machinery  or  plant  where practicable.  Guards  so  fitted  are  to  be  removed  or  adjusted  by  authorized  persons  only and therefore are to become inspected at regular intervals to ensure they are serviceable and afford adequate protection.
  • Safety rule for Plant operators are to :–
    1.  Walk around their machines to ensure the significant area is apparent in men and obstructions before moving off.
    2.   Ground all buckets cutting edges and so on before leaving the guarana plant for job breaks, knock-off, etc.
  • Nobody apart from the operator or authorized persons (e.g. Driver Instructor) would be to ride on plant.
  • No  employee  will  be  permitted  to  operate  designated  plant  or  machinery  or  explosive- powered tools or be the dogman, hoist driver, rigger or scaffolder unless he’s the holder of the current “Certificate of Competence” or perhaps a “Permit like a Learner”. Within the latter case the person must work underneath the supervision of the certificated man.
  • Suitable safety gear is going to be worn or used all the time, including –
    1. Safety helmets if you find danger of damage from falling or flying objects.
    2. Safety jackets when workmen might be subjected to injury risk from passing vehicles and plant.
    3. Any other components of protective equipment for example gloves, goggles, ear muffs and also the like, particularly if handling dangerous substances.

You can  read the next part of the  safety rules for a road construction jobs  by visiting to next posts.

Categories
Road Construction Traffic Control

Traffic Control During Construction

In any situation of road construction works progress, in which the motorist may be denied the safe usage of the full carriageway, some provision for traffic is essential. This road  traffic control  applies in both construction and maintenance.

The safety of the motoring public and of the job employees, is the key consideration in making adequate provision for road traffic. Both groups are entitled to equal consideration. Road Traffic may be slowed down, halted and held or diverted according to the job circumstances. However when any such action are taken, in addition to safety, public relations must be taken into consideration.

Two Lane Road Traffic Control

The Construction managers job is to all times aim at keeping at least two traffic lanes open. At least two traffic lanes should always be available during the hours of darkness. There are a number of ways of doing this

• Side tracking – A side track is defined as a specially constructed road or track by-passing an obstacle, roughly parallel to the main route, i.e. side tracks and so called detours on rural roads.

• Detouring – A detour is defined as a diversion of traffic using existing roads or streets, as in an urban situation.

• Widening and/or compacting existing shoulders to create an additional temporary traffic lane.

• Completing work each day to a stage where the job can be opened to traffic at night and weekends. As a example paving work

One Lane Road Traffic Control

The one lane road traffic are considered Where it is not practicable to keep two traffic lanes open, flagmen will always be used to control the traffic of road on the approaches to and through the job site. The some of the key factors for the use of flagmen are-

• When traffic is restricted to the use of one lane, flagmen will ALWAYS be used.

• On single lanes not exceeding 30 m in length one flagmen may be used.

• On single lanes exceeding 30 m in length two flagmen will always be used, each to be visible to the other and one to be nominated as controller. In cases where visibility between flagmen is not possible, small radio transceivers should be used. Alternatively a third flagmen, with visibility to the other two, may be used.

One lane  road traffic  is to be converted to two lanes road traffic for the hours or darkness and at weekends, when the job is unattended, i.e. the lane under construction is to be opened up.

Categories
Bitumen Road Construction

Bitumen Used in Road Construction


Bitumen is used in road construction as a binder for the purpose of retaining the cover aggregate, and providing a waterproof seal to the pavement. It is a natural constituent of petroleum is refined to separate the various fractions (petrol, kerosene, distillate etc.) and recover the it.

There are also natural deposits of  bitumen . Often these deposits are mixed with variable quantities of mineral matter, water and other substances. Bitumen is a semi-solid material at normal temperatures and can be produced in a variety of classes.

One means of determining viscosity in the laboratory is to measure the time for a fixed of the bitumen to be drawn up through a capillary tube by means of a controlled vacuum
or accurately reproducible head.

Bitumen performs the functions of a binder because it possesses the following properties :-

(1)     it has a relatively strong cementing action,

(2)     it will readily adhere (under favorable conditions) to stone aggregate,

(3)     it is highly waterproof,

(4)     it is durable,

(5)     it is resistant to the action of most acids, alkali and salts,

(6)     it can be softened or liquified by –

(a)     the application of heat

(b)    the addition of kerosene or oil (i.e. “cutting” or “fluxing“)

(c)    emulsification with water.

Bitumen alone could be used as a binder in which case the only preparation necessary would be to raise its temperature just sufficiently to make it liquid enough to pump and spray. However, the usual practice is to use a  cutback bitumen binder.

Categories
Bitumen Road Construction

Bitumen as Road Construction Material

When we discuss bitumen as road construction material, first 
Bitumen, this residue in the distillation involving natural bituminous primarily based raw petroleum is one of common binder. Distilled black is sometimes used by unique purposes. When it’s from high temperature, bitumen is usually liquid and also provides a lubrication which usually makes it possible for your asphalt to get spread and also compacted. Should the temperatures comes significantly under in which specific with regard to installing along with compacting, this mixture will probably restrict, distributing will become tough and it will be unable to end up being
compressed to the specified density.

As soon as the asphalt has become compressed and possesses refrigerated to normal heat range, your bitumen supplies the cohesion which often adheres the get aggregate together (for this reason the use of the phrase binder). At normal temperature bitumen is a semi-plastic stable. If the temperature increases or the particular pavement can be transporting slow-moving perhaps stationery traffic (at the traffic lights) the bond between blend particle is going to be reduce along with the blend a smaller amount stable. A R90 grade bitumen (80-100) penetration) is generally utilized in Queensland, on the other hand some sort of harder grade, e.g. R65 or even R45 may possibly always be attractive where traffic are very high as well as slow (at the traffic lights) or maybe the place that the local weather can be hot.


The  actual percentage of bitumen  used has to be controlled within tight limits for suit bitumen as road construction material. Too much bitumen will minimize friction involving the stone particles and therefore can lessen balance. Not enough bitumen can lead to bad compaction and a a lesser amount of dense and fewer durable pavement. The films connected with bitumen degrade while encountered with air along with climate. As a result a real mix together with way too small bitumen can decline easily particularly if it really is poorly compressed possesses too much the air void content material.