# Civil Engineering - Estimating and Costing - Discussion

### Discussion :: Estimating and Costing - Section 1 (Q.No.22)

22.

For 12 mm thick cement plastering 1 : 6 on 100 sq.m new brick work, the quantity of cement required, is

 [A]. 0.200 m3 [B]. 0.247 m3 [C]. 0.274 m3 [D]. 0.295 m3

Explanation:

No answer description available for this question.

 P Takhe Lomdak said: (Oct 2, 2013) How it is calculated out please tell me the procedure?

 Mukund said: (Dec 13, 2013) Total volume = 100*.012 = 1.2cum. 30% more mortar required so 1.2+ (.3*1.20) = 1.56cum. Now also to get dry volume of mortar, wet wet volume may b further increase by 25%. So volume of dry mortar = 1.6+ (1.56*.25) = 1.95cum. Now proportion = 1:6. So volume of cement = (1/7) * 1.95 = 0.2785 (ans).

 Chandu said: (Jan 27, 2014) Given volume = 100*.012 = 1.2cum. Increase mortar by 30% = 1.56cum. For volume of dry mortar increase 25%= 1.56+ (1.56*.25) = 1.95cum. Now proportion = 1:6. k+6k=7k. So volume of cement = (1/7) * 1.95 = 0.2785. This is the correct answer.

 Ajay Saini said: (Apr 23, 2014) You can take 30% for uniform wall and 25% for dry volume i.e. total 55% Now 10x10x0.012 = 1.2 hence (1.2/1+6)+(1.2/1+6)x55/100 = 0.2785.

 Pritam said: (Jul 30, 2014) How could you take, extra 30% morter?

 Piyush Singh said: (Sep 9, 2014) Volume of plaster = area * thickness = 0.012*100 = 1.2 cum. Increase this by 30 % therefore = 1.2*1.3 = 1.56 cum. For volume of dry mortar = 1.25*1.56 = 1.95 cum. Now 1 part is of cement and 6 part is of sand so, Cement = (1/7) *1.95= 0.2785 volume of cement. Volume of one bag of cement = 0.035 cum. So no of bags required = 8 bags.

 Nivas said: (Sep 18, 2014) Is is possible go around 55% volume extra for dry & wet mortar?

 Abhijit Mandal said: (Jan 21, 2016) Volume of plaster = 0.012*100 = 1.2 m^3. Add 20% depression & wastages volume of plaster = 1.2+1.2*20% = 1.2+0.24 = 1.44. Add 1/3 dry volume = 1.44+1.44*1/3 = 1.44+0.48 = 1.92 m^3. Cement = 1.92*1/7 = 0.274 m^3.

 Adebola said: (Sep 13, 2016) I think answers may vary because one may decide to allow 10-20% for wastage& 30%-35% for shrinkage.

 Brijesh Vishwakarma said: (Sep 14, 2016) Volume of plaster = 0.012 * 100 = 1.2 m^3. Add 60% for new wall depression & wastages volume of plaster = 1.2 + 1.2 * 60% = 1.92 cum. Cement = 1.92 * 1/7 = 0.274 m^3.

 Puja Mandal said: (Nov 27, 2016) According to me, it is .012 * 100 = 1.2, dry wt = 1.54 * 1.2 = 1.848, 1.848 ÷ 7 = .264.

 Aaina said: (Feb 23, 2017) If it's 15mm thick then what is the answer?

 Arjun said: (Feb 25, 2017) As per my solution, it's 33 percent extra why you are taking 30 percent?

 Sufazo said: (Mar 28, 2017) According to this answer, they taking 60% extra => 1.2 * 60/100 = 0.274.

 Shahanshah Khan said: (Nov 14, 2017) I think dry value taken so large in solution maximum take extra 20% to 30%.

 Mohit said: (Dec 26, 2017) If it is 15 mm thick than answer is .345 cum.

 Salma said: (Jan 10, 2018) 1*100*. 012*1. 54/7 =. 274.

 Adhiyaman said: (Jan 10, 2018) Thanks to all.

 Mohit Motwani said: (Jan 30, 2018) Volume of mortar required= 100*.12 = 1.2. Total 60% of volume increases for dry mortar 1.2+ (.60* 1.2)= 1.92. Now volume of cement = 1/7 * 1.92= 0.2743.

 Muthu Nayak said: (Mar 7, 2018) dry vol=area*thckness*1.3*1.25. dry vol=100*0.012*1.3*1.25. =1.95cum, Cement=1.95/1+6, Cement=0.278cum,

 Sachin Das said: (Apr 23, 2018) For 1 m3, Dry volume = 1m3, Wet volume is 35% of dry volume, So we have to take. 1: 6 = 1.35 ( 1.35 m3 become 1m3 after adding water in mortor....and for concrete we take 55%....1.54m3 = 1m3). 1+ 6 = 7........1.35/7 = 0.193 cement required per m3, Volume = 12/1000 * 100 = 1.2 m3, Required cement volume= 1.2 * 0.193 =0.23.

 Naveen Srivastava said: (Sep 29, 2018) 0.278 is the incorrect answer. There is no need to add an extra 25%. It's Converted to wet volume to dry volume by 1.30. The Correct ans is 100 * 0.012 * 1.30 = 1.56 * (1/7) = 0.222cum.

 Deepak said: (Oct 4, 2018) Why to increase by its 30%?

 Matiur Rahaman said: (Nov 21, 2018) Given thickness of plaster = 12mm = 12/1000 m = 0.012m. Ratio (1:6). Since you have not given assume that 100 sq M of plaster is Done. Thus volume of plaster = 100 x 0.012 =1.2 cum. Add 60 % for unevenness of plaster surface and voids. Total volume of plaster work = 1.2 + 60/100 x 1.2 =1.92 cum. Volume of cement = 1.92/(1+6) =0.274 cum.

 Ramvir Singh said: (Dec 26, 2018) @All We will take 60% extra of total Volume for water and joint filling between the bricks. So, 1 for 15mm thick plasters the answer is 0.3428 m3 and For 12 mm thick plaster it is 0.2742 m3.

 Shree said: (Jun 5, 2019) Wet mix mortar for uniform layer =12/1000*100 = 1.2 cum. Adding 30% to fill up joints, uneven surface, Then, Quantity of Mortar =1.2 + 1.2*30% =1.56 cum. Increasing 25% the dry volume = 1.56+1.56*25%= 1.95 cum. Total parts (C:S) = 1+6 =7. Then, Cement = 1.95/7 = 0.278 Cum = 0.278/0.0347 = 8 Bags Cement required.

 Bharat said: (Jul 16, 2019) Thanks all.

 Govind said: (Sep 9, 2019) Thanks everyone for explaining the solution.

 Jigme said: (Sep 15, 2019) Thank you all for explaining the answer, clearly.

 Dinesh Sunar said: (Nov 24, 2019) Area to be plaster = 100m^2. Thickness of plaster = 12mm = 0.012m. The volume of plaster = 100x0.012 = 1.2m^3. Adding 20%of wet volume, = 1.2+1.2x20% = 1.44m^3. Increase the wet material by 1/3rd volume in order to get dry volume. The volume of dry material = 1.44+1.44x1/3. , ,, = 1.92 m^3. Now, volume of cement = 1/7x1.92 = 0.274.

 Hari said: (Aug 23, 2020) Why we take 30% extra? Please explain.

 Kaku said: (Sep 30, 2020) The correct answer is 0.2228m3.

 Jon said: (Dec 2, 2020) Why take 30% extra here? Please explain me.