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  1. defg

    What are the merits and demerits of the Design and Built projects?

    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...
  2. defg

    Defferennt between 80/100 and 85/100 penetration grade bitumen

    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...
  3. defg

    Compaction of crushed stone base

    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...
  4. defg

    which type of roller required to compact crushed stone base

    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...
  5. defg

    Change of stabilised base course(C2)to crushed stone base(CRR)

    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...
  6. defg

    Effect of excessive cement in stabilised subbase

    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...
  7. defg

    Effect of excessive cement in stabilised subbase

    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...
  8. defg

    What is the effect of changing stabilised base course layer(C2) to cru

    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...
  9. defg

    What is the effect of stabilised subbase to crushed stone base?

    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...
  10. defg

    Flash point failure of 80/100 penetration grade

    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...
  11. defg

    Wich important tests are required on crushed stone base course?

    I'm currently supervising a road designed to a bitumen standard-surfacedressing.The pavement layers composes of stabilised subbase,crushed stone base(CRR)and surfacing.Now I'm at base course stage and in principle Ihave already analysing the most important tests required for the assessment of...
  12. defg

    Paving blocks for road shoulders.

    What is the required compressive strength for the paving blocks design for road shoulders?I'm currently making some paving blocks for road shoulders having the following dimmensions(220mmx110mmx70mm thick).These blocks when crushed they yeild compressive strenth of around (7 to 9)MPa. In the...
  13. defg

    Which important tests required on crushed stone base?

    I'm current supervising a road designed to a bitumen stard-surface dressing.The pavement layers composes of stabilised base,crushed stone base(CRR)and surfacing.Now I'm at base course stage and in principal I have already analysing the most important tests required for the assessment of the rock...
  14. defg

    Initial Consumption of Lime for stabilised subbase materials

    According to BS1924:Part2:1990 require the materials to be stabilised with a certain percent of cement to be assessed first by determining the initial consumption of lime/cement.Which in principle the minimu and the maximum required initial consumption of lime for tropical soils/gravel materials?
  15. defg

    Which compactive effort to use for stabilised layer?

    Dear Sir, I'm carrying out a stabilised layer of subbase materials(C1),the general specification states that it should be compacted at 95%,other books state that it is 97% and the revised one corresponding to the project staes that compaction shall be 98%.Please which compaction between the...
  16. defg

    Is it possible to use unconfined compressive strenth to determine the

    Dear Sir/Madam, In practice we usually determine the percentage of cement to use to produce a certain strength in MPa for different type of soil(stabilised layers).The test results are then plotted i.e compressive strenth against percentage of cement used.It is possible to plot the compressive...
  17. defg

    Bitume price indices

    Is there any one who knows the the website where I can view and download the price indices for bitumen.Our contract specifices that the source should be from "HSFO 180CST MEAN/Average PLATTS Quotations and the currency of index in US$"Please assist
  18. defg

    Which dry density to use?Density of cement or MDD of subbase materials

    I have got some arguments between my colleques.We are dealing with stabilization works for C1-stabilised subbase.After analyzing the laboratory trial tests revealed that 3%of cement is adequate. Now on my case I want to make field trial test of 100m length and my road is 9.8m wide and the...
  19. defg

    Which dry density to use?Density of cement or MDD of subbase materials

    Ihave got some urguments between my colleques.We are dealing with stabilzaton works for C1-stabilised subbase.After analysing the laboratory trial tests revaled that 3%of cement is adequate.Now on my case Iwant to make field trial test of 100m length and my road is 9.8m wide and the thickness of...
  20. defg

    Bitumen price indices

    Is there any one knows a free website where I can view and download the indices for bitumen materials.I have tried many website in vain

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