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...
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...
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...
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...
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...
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...
I'm currently carrying out some test for deterimning 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 wonderfull terst results.They gave me 5 to 6%cement to cater for the initial consumption of...
