It has been customirized that all engineering projects has to be designed by the appointed Consultant and the nominated Contractor by the Consultant/Client has to construct or build.That is to say the Design is carriedout by the Consultant.Built has to be carried out by the Contractor.But now...
Hi BigH,
Thanks you for the post.The geographic location of the project is Africa(Tanzania).The project road is located in a moderate climatic zone.The bitumen materials(85/100)is expected to be brought from Saudi Arabia or Iran.
I'm currently supervising a road to be finished with a double surface dressing.The Contractor is now out of 80/100 penetration grade bitumen.He has requested from the Engineer to order 85/100 penetration grade bitumen as the previous supplier has run out of 80/100 penetration grade.Is there any...
In principle the crushed stone base after the compaction finish the section must be slushed by a pneumatic or tyred roller inorder to bring all fines to surface.All the fines must be broomed prior to primming.This will enable the primer to penetrate into the base for at least (3-10)mm.This will...
In fact six pasess for the use of 14tonnes vibratory roller is adequate to achieve 100%compaction effort required for the crushed stone base.What is to check and make followup are the followings:
a) are the roller operatory putting the roller in a high gear(vibrating gear)during this...
Which type of a roller is required to compact a crushed stone base(CRR)specified norminal degree of compaction is 104%by the use of BS-Heavy.Also Iwould like to know how many passes will be required to achieve the spcified degree of compaction?The maximum dry densities achieved from that crushed...
Which type of a roller is required to compact a crushed stone base(CRR)specified norminal degree of compaction is 104%by the use of BS-Heavy.Also Iwould like to know how many passes will be required to achieve the spcified degree of compaction?The maximum dry densities achieved from that crushed...
Which type of a roller is required to compact a crushed stone base(CRR)specified norminal degree of compaction is 104%by the use of BS-Heavy.Also Iwould like to know how many passes will be required to achieve the spcified degree of compaction?The maximum dry densities achieved from that crushed...
I'm currently supervison a road which formally was designed to be constructed with stabilised base course(C2).But due to unavailable suitable gravel materials to ssiut for this base course works prior to stabilisation,the Contractor requested to change the base course from stabilised layer to...
Universalkeith,
Thanks for good reply,let me give you a short history of the source of materials prior to stabilisation.In the project corridor no suitable borrowpits which comply to C1 materials requirements prior to stabilisation.This forced the Contractor to crush soil materials with some...
I have cariedout laboratory tests for subbase stabilisation trial test.According to the test results revealed that by using 2.5%cement is adequate to aquire a streght of more than 1MPa including the initial consumption of lime/cement.When the Contractor started to lay the stabilised materials on...
Ihave carried out laboratory test for subbase stabilisation trial test.According to the test results revealed that the use of 2.5%cement is adequate to aquire a strength of more than 1MPa including the initial consumption of lime/cement.But in practice when the Contractor has started to lay the...
Due to shortage of appropriate materials which comforms to C2 requirements prior to stabilisation,I was obliqued to request for a change.Instead of using stabilised base of 150mmthick to use 150mm thick of crushed stone base.Granite rocks are plenty in the project area.The design traffic class...
Curently I'm working with the Contractor to construct a road to bitumen standards-surface dressing.According to the design and drawings indicate that the subbase shall be of stabilised 200mm thick,and the base ccourse shall be ofstabilised(C2)of 150mm thick.Traffic class in that area is...
Dear all,
Ihave tested 80/100penetration grade bitumen materials for surface dressing according to AASHTO M20-70(1993)and the test results achieved are as follows:Ductility at 25C,cm=>100-passed,penetration value,mm=92-passed,FLASH POINT=312-failed,Solubility in...
