# For civil engineers

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#### man dunga

##### Senior Member
Joined Oct 13, 2013
195 107 60
How to calculate the quantities of ingredients of concrete(i.e cement,sand and aggregate) of known grade
e.g grade c 20 (1:2:4) ,for 1cubic.m of concrete.

Karibu kwa mchango wowote wa ki engineer.

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#### METAL

##### JF-Expert Member
Joined Aug 21, 2013
297 2 0
How to calculate the quantities of ingredients of concrete(i.e cement,sand and aggregate) of known grade
e.g grade c 20 (1:2:4) ,for 1cubic.m of concrete.

Karibu kwa mchango wowote wa ki engineer.
upo chuo gani,swali lenyewe hata mtoto wa form five anaweza calculate hapo,nina wasiwasi na chuo chako unachosoma academically kiko chini sana

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#### NIMEKIMBIA CCM

##### Senior Member
Joined Oct 4, 2011
193 1 0
twende kazi kijana(japo swali lako nahisi halijaka vizuri)
SOLUTION
1.the total volume of cement is 1cubic.m
so yield of concrete proportional(1:2:4)
=2/3(1+2(1)+4(1))
=4.667cubic m
2.by absolute volumes
here we have to assume the following(sababu swali lako halijakamilika)
cement:sp.gr.3.15 an wt in each bag 0.50kN
sand;sp.gr.2.65 and unit wt 15kN/cubic m(this is when dry)
coarse aggregate;sp;gr.2.80 and unit wt 15kN/cubic m
water cement ratio:0.60
unit wt of water 10KN/cubic m

haya sasa tuanze
volume of cement=0.50/3.15*10=
volume of sand=2*1*16/2.65*10=
aggregate=4*1*15/2.80*10=

malizia majibu yake hapo
noteswali lako halijakamilika kabisa hata hivyo imenilazimu nitumie baadhi ya assumption,,next time uje na swali lililo kamili

mwaka wa pili (joseph university in tanzania),,,huo ni mchango wangu nilipokosea unaweza kurekebisha kwa mchangiaji

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#### man dunga

##### Senior Member
Joined Oct 13, 2013
195 107 60
upo chuo gani,swali lenyewe hata mtoto wa form five anaweza calculate hapo,nina wasiwasi na chuo chako unachosoma academically kiko chini sana
Umenijibu hivi halafu utajiita great thinker! nina uhakika asilimia 100 wewe sio civil engineer na hii post ni kwa civil engineers.Halafu kuwa member wa jukwaa hili lazima uwe mwanafunzi? mchango unaotakiwa hapa ni wa ki engineer ,nakuhakikishia hakuna hata mwanafunzi mmoja wa A level au hata mtu yeyote ambaye siyo engineer anaweza kufanya calculation hii.

Civil engineering professors,doctors,students etc ndo wanatakiwa watoe contributions sio wewe wa BA in sociology.
Kwa mtindo huu vyuo vyetu vina kazi ngumu kuwaelimisha watu kama ww maana mtu anapost kitu ambacho kina apply katika civil engineering field ww unaleta kejeli.

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#### man dunga

##### Senior Member
Joined Oct 13, 2013
195 107 60
twende kazi kijana(japo swali lako nahisi halijaka vizuri)
SOLUTION
1.the total volume of cement is 1cubic.m
so yield of concrete proportional(1:2:4)
=2/3(1+2(1)+4(1))
=4.667cubic m
2.by absolute volumes
here we have to assume the following(sababu swali lako halijakamilika)
cement:sp.gr.3.15 an wt in each bag 0.50kN
sand;sp.gr.2.65 and unit wt 15kN/cubic m(this is when dry)
coarse aggregate;sp;gr.2.80 and unit wt 15kN/cubic m
water cement ratio:0.60
unit wt of water 10KN/cubic m

haya sasa tuanze
volume of cement=0.50/3.15*10=
volume of sand=2*1*16/2.65*10=
aggregate=4*1*15/2.80*10=

malizia majibu yake hapo
noteswali lako halijakamilika kabisa hata hivyo imenilazimu nitumie baadhi ya assumption,,next time uje na swali lililo kamili

mwaka wa pili (joseph university in tanzania),,,huo ni mchango wangu nilipokosea unaweza kurekebisha kwa mchangiaji
kijana una concept ila hapo kwenye solution 1 hauko sahihi.Huwezi sema volume of cement ni 1cubic.m kwa sababu kama unafikiri imetoka kwenye 1:2:4 umekosea kwa sababu 1:2:4 haimaniishi volume of ingredients bali inamaanisha 1part of cement ,2part of sand and 4part of aggregate na inaweza ikawa ina represent volumetric relation or weight relation depending on the mix design,code,material etc

But thank u for your contributions and mix design is required in order to determine the qty of these ingredients in which there are so many factors,steps to be considered.