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The specification states that hot applied thermo-plastic materials shall be of such rthickness to uniformly coat the equivalent of 14mm single surface dressin g and having a minimum thickness of 3mm.But the manufacturer says that the road marking paint of 3mm thickeness is too thick.Please...

The concrete strngth of seven days must be 75percent of 30MPa minimemu required for 28days ie must be 22.5MPa.If it is different the mix design is improper or no enough cement in it.Please redesign again.

I'm currently working on asphalt concrete road(AC-14).The Contractor wants to change from AC-14 to AC-20 stating the 14mm aggregates are too small compared to the heavy traffic expected to pass on the road.I can I allow him to make such changs???

I'm currently carrying asphalt concrete works by the use of AC-14.The Contractor claims that the size of the stone 14mm diameter used as maximamum seems to be very small compared to the type of vehicle passing over it.The vehicles are very heavy.The Contractor proposes to used 2omm seze...

I,m currently involved in the design of drainage structure(lined ditches,unlined ditches,scour checks etc)In pricniple the major items to consider is the gradient of the ditch and type of soil.Unfortunately I don't have any literature on this with me.Please is there any on who know literature to...

I have took some water from the Contractor's purification plant and sent to reputable water testing laboratory.The tested parameters were pH,electrical conductivity,total dissolved solids,settable matter,turbidity,colour,phenohthalin alkalinity,total alkalinity,total hardness,corbonate...

In principle sand cone replacement is more accurate than troxler when carryout field density tests.However sand replacement method is slow as it involve more activities.In order to use troxler you are required to calibrate the troxler on site in line with the sand replacement method.First step...

Hi Ron,thanks you for your replied.In principal in the bill of quantity the unit of AC14 is given in cum.And the AC14 comproposed of different aggregate size including 5%bitumen of 60/70penetration grade.The unit given in the bill of quantity for the bitumen is tonne.Now the Contractor wants to...

I'm currently designing Asphalt concrete(AC14).The combination of the aggregate used are as follows:23%0f (10-14)mm,27% of (5-10)mm,48% of (0-5)mmm,3% 0f filler-crusher dust and 5% of 60/70 penetration grade bitumen.In the bill of quantity the bitumen 60/70 is to be paid in tonnes.The Contractor...

Thanks Zambo for the reply,I'm in Africa the country so called Tanzania.The bitumen I'm using is asphalt 80/100

I'm currently constructing an asphalt concrete road of 5cm thick.During the design the Contractor has added 2%cement as an active filler in the mix proprortions(different types of aggregate+5%bitumen and2%active filler(cement).However the supervidsion team carriedout some mix design and found...

Thanks Hokie66 for your reply.Well the term stirrups Imean a very small wire of 1.6mm or 1.25mm in diameter used to tie one piece of reinforcement end to another end by providing apropriate overlaps.

Currently I'm supervising a culverts structures of various diameter(pipe and box culverts)The Contractor would like to weld the overlaps of the steel reinforcement instead of using stirrups to bind the overlaps.He has proposed to used an overlap of 10cm and use spot or full weld to joint the...

Hi singkt,thanks you for your reply.In principle the soil material was sieved down on 0.45mm sieve and then the determination of the initial consumption of lime/cement started.The question is the ICL obtained was too high compared to other soils.This means that the soil is not economical for...

In addition to my previous question,Iforgot to mention the following as given in the bill of quantities:We have MC-30 Cut back bitumen and the another item we have curing membrane,anionoc bitumen emulsion 58% binder.Similarly we have an item tack coat of anionic bitumen emulsion,58%binder.Does...

Hi Zambo,I'm carrying out the surface dressing on primed base course composed of crushed stone base(CRR)

I'm currently carrying out double surface dressing work for dual carriageway in road construction.In the bill of quantity there is an item which require placement of curing membrane,anionic bitumen emulsion 58%binder for MC-30 and for 60/70 penetration grade.ISit necessary to use these emulsion...

I'm currently carrying out some test for determining the initial consumption of lime(ICL)for a certain soil materials taken from borrowpits.The soil laboratory where the test are carried out gave me a wonderful test results. They gave me 5 to 6%cement to cater for the initial consumption of...

Hi LJB1955,to answer your question regarding inaccurate of the nuclear desinty gauge,you are required to demonstrate it on site.Choose a road section where you are intending to carry the field density test say 1km stretch.Carry out both tests by the use of sand replacement method and by the use...

Thanks Ron for your technical advise.Principally we are using a full-cement design procedure for testing the ICL.