sule4:
I appreciate the knowledge you're letting out.

mufutau55:
Good work.. I dey class oh! Learning as usual.

Hajji M.

Fhemmmy:

You're no more my brother oh..... how come you didn't holla @me to come and learn? Diaris God oh

abdulwastecx:
job progress

emmadejust:




I wish you more speed and strength to meet up with the targeted time .....

mufutau55:


My brother.. I beg make you no vex o. I think say you busy for the other side...
I dey follow this guy well, well because the guy knows his onions.
With the new Govt I hope that tariff no go dey implemented o, because that is what they promised o.

Hajji M.

abdulwastecx:


for the columns
the height of 6'' block is = 225m
15 courses = 15 x 225 = 3375mm
assuming a thickness of mortar of 2omm = 20 x 15 = 300mm
total height of column = 3375 + 300 = 3.675m

column reinforcement length = main height ( 3.675) + bottom anchorage ( 0.15) + top anchorage (0.15) = 3.975m
y12 length is 12.3m, No of bars = 12.3/4 = 3bars

Bar required per column = 4
total Number = 4 x 15 = 60
No of bars required = 60/3 = 20bars for the longitudinal reinforcement

for the rings using Y8 and spacing of 300mm c/c
length of links for a rectangular column of 225 x 150 ( due to the 6'' side) and allowing for cover of 20mm
L= 900mm
Number of links in a column with 3000mm spacing = 13 links
No of L in one length of bar = 12.3/0.9 = 13links
Total number of Y8 required for the link = 15Y8



for the concrete
volume of concrete = 0.225 x 0.15 x 4 =0.135m3/column
total volume of all the 15 columns = 0.135 x 15 =2.025m3
using a mix ratio of 1:2:4
part of cement = 2.025 x 1/7 x 1506/50 =9bags of cement ( use 12 bags allowance for shrinkage and wastage)
part of sand = 2.025 x 2/7 x 1.6 =1tonnes of sharp sand
part of gravel = 2.025 x4/7 x 2.4 = 3tonnes of gravel

summary for the column reinforcement
s/n Descriptions Quantity unit rate amount
1. Y12 20 Nr N1,200 N24,000
2. Y8 15 Nr N800 N12,000
3. Dangote cement 12 bag N2,000 N24,000
4. sharp sand 1 tonne N 3,00 N3,000
5. Gravel 3 tonne N 8,000 N24,000 ( port Harcourt price)


6. workmanship N36,000
Total = N123k ( minus the cost of formwork)

abdulwastecx:
more pics

snakebeat:

I can see another reinforcement on top d bld height, was is it for?

snakebeat:

Thank u for d explanation sir. But as regards
part of cement = 2.025 x 1/7 x 1506/50, how did u come abt 1/7?

Bar required per column = 4, how also did u come abt this 4? Or it's standard?

abdulwastecx:



1/7 is the ratio of cement in the mix 1:2:4 ( where cement = 1, sand =2, gravel =4, sum of all ratio = 7)

4 number of reinforcement is the number specified by the design engineer. structurally, one can only have even number of column eg. 4, 6, 8, 10 etc

abdulwastecx:


the reinforcement is for the head course to receive the steel truss roof

snakebeat:

But why steel? Are d spaces that big?

abdulwastecx:


it is rivers state school and they have their specifications... the spans in the chapel is very big

snakebeat:

Thanks a lot sir....
U're good... Don't knw if u can stretch ur kindness by doing justice to d following questions, how many headpan or wheelbarrow can one get from one tonne of sharp sand and granite?
If one is to get 35blocks from one bag of cement, what would be the mix ratio?

Hapy sunday....

abdulwastecx:


let me give you a small breakdown sir.
gravel are sold in tonnes,
1 tonne = 1000kg
we all know the relationship between mass and volume, you headpan, bucket or any other working materials has volume, such relationship is density = mass/volume
all you need to do is get the volume of the head pan or bucket, get the density of such aggregates ( e.g gravel with density of about 2400kg/m3. sharp sand with density of 1600kg)

from the above, simply make volume = mass/density
and then divide the result by volume of your head pan or bucket to get the number of head pan in it.

Note that:
1. a trip of any material is subject and depends on the carriage capacity of the tipper, we have 30tonnes trip of gravel, we have 15tonne trip of gravel.

2. for sand, we buy in bucket, we have 3 bucket equivalent to 15 tonnes

snakebeat:

U're bless... Where do u reside?

princechigzy:
I know i came late but i am seated and have learned a great deal. Please who can give me his note so i can copy. My engineer, weldone.