Plastering work- Manpower calculation

1.Internal Wall plastering:

Manpower required per day for Internal wall plastering (8hrs/day):

Internal wall plastering- 10 sqm

1 manson

1 male mazdoor

1 female mazdoor

That means 1manson, 1 male mazdoor,1 female mazdoor complete the Internal wall plastering 10 sqm in 8hrs.

Example: Calculate the manpower required for to complete the 100 sqm Internal wall plastering in 2 days?

Solution: Qty=100sqm

Duration= 2 days

Per day productivity = 100/2 = 50 sqm

No of mason,male mazdoor,female mazdoor= 50/10=5 nos

No of mason=5(per day)

No of male mazdoor=5(per day)

No. of female mazdoor =5( per day)

To complete the Internal wall plastering work= 10 no of manson

=10 no of Male mazdoor

=10 no of female mazdoor

2.External and Ceiling wall plastering:

Manpower required per day for External wall and ceiling plastering (8hrs/day):

Internal wall plastering- 8 sqm

1 manson

1 male mazdoor

1 female mazdoor

That means 1manson, 1 male mazdoor,1 female mazdoor complete the External wall and ceiling plastering 8 sqm in 8hrs.

Example: Calculate the manpower required for to complete the 100 sqm External wall plastering and ceiling plastering in 2 days?

Solution: Qty=100sqm

Duration= 2 days

Per day productivity = 100/2 = 50 sqm

No of mason,male mazdoor,female mazdoor= 50/8=4 nos

No of mason=4(per day)

No of male mazdoor=4(per day)

No. of female mazdoor =4( per day)

To complete the Internal wall plastering work= 8 no of manson

=8 no of Male mazdoor

=8 no of female mazdoor

Labour Productivity- Block work and Brick work (Manpower calculation)

1.AAC BLOCK WORK (600X200X200)mm or (24X8X8) inch

Manpower required per day for block work (8hrs/day):

AAC BLOCK WORK -8inch- 10 sqm

1 manson

1 male mazdoor

1 female mazdoor

That means 1manson, 1 male mazdoor,1 female mazdoor complete the blockwork 10 sqm in 8hrs.

Example: Calculate the manpower required for to complete the 100 sqm block work (AAC BLOCK WORK (600X200X200)mm in 2 days?

Solution: Qty=100sqm

Duration= 2 days

Per day productivity = 100/2 = 50 sqm

No of mason,male mazdoor,female mazdoor= 50/10=5 nos

No of mason=5(per day)

No of male mazdoor=5(per day)

No. of female mazdoor =5( per day)

To complete the 100 sqm block work= 10 no of manson

=10 no of Male mazdoor

=10 no of female mazdoor

2.AAC BLOCK WORK (600X200X100)mm or (24X8X4) inch and (600X200X150)mm or (24X8X6) inch

Manpower required per day for block work (8hrs/day):

AAC BLOCK WORK -6 and 4inch- 8

1 male mazdoor

1 female mazdoor

That means 1manson, 1 male mazdoor,1 female mazdoor complete the blockwork 8 sqm in 8hrs.

Example: Calculate the manpower required for to complete the 50 sqm block work (AAC BLOCK WORK (600X200X150&100)mm in 2 days?

Solution: Qty=50sqm

Duration= 2 days

Per day productivity = 50/2 = 25 sqm

No of mason,male mazdoor,female mazdoor= 25/8=3.2=3.2 nos

No of mason=3.2(per day)

No of male mazdoor=3.2(per day)

No. of female mazdoor =3.2( per day)

To complete the 50 sqm block work= 6.4=7 no of manson

=6.4=7 no of Male mazdoor

=6.4=7 no of female mazdoor

3.BRICK WORK (190X90X90)mm

Manpower required per day for 9 inch brick work (8hrs/day):

Brick work-9inch- 1.25cum

1 manson

1 male mazdoor

1 female mazdoor

That means 1manson, 1 male mazdoor,1 female mazdoor complete the brickwork 9inch 1.25cum in 8hrs.

Example: Calculate the manpower required for to complete the 20 cum brick work 9inch in 2 days?

Solution: Qty=20cum

Duration= 2 days

Per day productivity = 20/2 = 10 cum

No of mason,male mazdoor,female mazdoor= 10/1.25=8 nos

No of mason=8(per day)

No of male mazdoor=8(per day)

No. of female mazdoor =8( per day)

To complete the 20cum brick work= 16 no of manson

=16 no of Male mazdoor

=16 no of female mazdoor

4.BRICK WORK (190X90X90)mm

Manpower required per day for 4.5 inch brick work (8hrs/day):

Brick work-4.5inch- 5 sqm

1 manson

1 male mazdoor

1 female mazdoor

That means 1manson, 1 male mazdoor,1 female mazdoor complete the brickwork 9inch 5sqm in 8hrs.

Example: Calculate the manpower required for to complete the 150sqm brick work 4.5inch in 2 days?

Solution: Qty=150 sqm

Duration= 2 days

Per day productivity = 150/2 = 75 sqm

No of mason,male mazdoor,female mazdoor= 75/5=15 nos

No of mason=15(per day)

No of male mazdoor=15(per day)

No. of female mazdoor =15( per day)

To complete the 150 sqm brick work= 30 no of manson

=30 no of Male mazdoor

=30 no of female mazdoor

Estimates/Quantity Surveying

What is Estimates?

The construction project's estimated cost was delivered in advance.

The estimation is made:

If there is enough money, to allocate a certain sum to the project, or to adjust the project's specifications to fit the available funds.

Types of projects:

Building

Roads

Airports

Bridges

Culverts

Rate Analysis of cement mortar

Rate Analysis of cement mortar:

Data required for rate analysis for cement mortar:

A. Material cost

B .Labour cost

A. Material required for cement mortar

1.Cement bag=350/-(APPROX)

2. Sand=1539/-(APPROX)

B.Labour required for 1CUM of cement mortar

1. Mazdoor= .75 per cum

2.Bhisti=.07 per cum

Mazdoor rate=500/- per day

Bhisti rate=400/- per day

1.Calculate cement content and sand content for 1 cum of cement mortar, CM:1:6

Dry Volume of cement mortar = (33%*1)+1

=.33+1= 1.33 cum

1.Cement content =1.33*((1/(1+6))

=1.33*.143

=.19 cum

Weight of cement= density of cement* volume

=1440 kg/m3* .19m3

=273.6 kg

1 cement bag = 50 kg

No. of cement bags required for cum mortar =273.6/50=5.5 bags=6 bags

2. Sand Content= 1.33*((6/(1+6))

=1.14 cum

Weight of sand= 1700 kg/m3*1.14 m3

= 1938 kg

= Cement content in cum x 6 times (CM Ratio 1:6)

=.19*6

=1.14cum

Rate Analysis

1. Material cost

a) Cement Bag= 6* 350/-

=2100

b) Sand= 1.14*1539/-

=1755/-

Total Material cost= 2100+1755

=3855/-

2. Labour Cost

a) Mazdoor=.75*500

=375

b) Bhisti= .007*400

=28/-

Total Labour cost=403/-

Material cost+Labour cost=3855+403=4258/-

Add Water charges on Total amt= 4258*(1.5)%

=64

Add 10% Contractors profit=4258*10%

=425/-

Total Rate per cum of cement mortar=4258+425+64

=4747/-

What is Fine Aggregate?

Fine Aggregate: The crucial component in the production of concrete, fine aggregate is made up of particles that can pass through a 4.75mm IS Sieve.

ex: Sand, River sand, crushed stone, M sand

Density of steel, Density of RCC, Density of PCC, Density of Fine aggregate, Density of coarese aggregate

Density of Construction materials:

As a Civil Engineer should have knowledge on density of construction materials and this question is commonly asking question in interview.

As per IS code

RCC=2500KG/M3

PCC=2400KG/M3

STEEL=7850KG/M3

CEMENT=1440KG/M3

BRICKS=1600 TO 1920 KG/M3

FINE AGGREGATE=1500 TO 1700 KG/M3

COARSE AGGREGATE=1300 TO 1500KG/M3

Common Interview questions on Quantity Surveying

1. What will you do if the site qty differ from drawing quantity?

This happens common in all sites. There will be executed qty not exactly match with drawing qty it will be there some variance. In this case if executed qty is more than drawing quantity then we have to check with site engineers and Quantity surveyor for what reason executed quantity exceeded or lessen than drawing quantity. If exceeded then we have to claim extra quantity which are executed at site more than drawing quantity with proper clarification.

2. Wastage % for Reinforcement Steel?

As per IS 1786

1. Up to 10 mm - (plus/minus: 7%)

2. 10 - 16 mm - (plus/minus 5%)

3. Over 16 mm - (plus/minus 3%)

3. Code for Structural steel and reinforced steel?

IS 800 for structural steel and for reinforced steel IS 1786

4. How you do the rate analysis?

In rate analysis, the cost of materials is estimated as a sum of the material's initial cost, transportation expenses, and taxes. The cost of labour is determined by the level of competence required, such as skilled, semi-skilled, and unskilled labour. Materials and labour prices differ from one location to another.

5. What is margin for OH & Profits in Rate analysis?

As per CPWD overheads and contractor's profit is 15%

What is Steel Reconciliation?

What is steel reconciliation?

It is the process of comparing real data with standard data after taking variance data into account.

E.g. Consider obtaining 50 MT of 15mm dia. TMT steel bars in the Fe-500 grade. Assume that the receiving bar weighs 2.63 kg/Rm.

What is material reconciliation report?

At the conclusion of a production process, you analyze and validate ingredients using material reconciliation. It enables you to make a comparison between the amount of stuff that really came in and the amount that was anticipated or produced.

In construction, what does reconciliation mean?

A reconciliation is a separate cost estimate that the end user can contrast with the contractor's cost estimate to reduce budget gaps and fix detected issues. It is possible to verify that any discrepancies between the two estimations are suitable and to be expected.

Why is reconciliation crucial in construction?

Why is it vital to reconcile cost and value? You can report on a contract's profitability over the course of its life with the use of cost value reconciliations. Without a CVR procedure in place, avoidable losses on projects of all kinds can sometimes go unnoticed, harming the bottom line of your construction company.

Why is it vital to reconcile cost and value?

You can report on a contract's profitability over the course of its life with the use of cost value reconciliations. Without a CVR procedure in place, avoidable losses on projects of all kinds can sometimes go unnoticed, harming the bottom line of your construction company.

How do you determine the steel rolling margin?

Actual Sectional Weight of Bars = Total Weight of Bars (Dia wise) / Total Running Metre of Bars Sectional weight should be compared to Standard IS Weight. Weight calculated using IS Standard = 162 divided by Dia. The discrepancy between steel's theoretical and actual weight is known as the rolling margin.

What is steel wastage?

Steel is said to be wasted if its length is less than 1000mm. Steel for structures. 12% to 15% Fabrication tasks include cutting and bending steel plate or section results in structural waste.

A CVR process is what?

Construction project budgets are monitored and measured against actual spending through the use of cost value reconciliations (CVR). When negotiating final accounts, they can also be used to present the project's financial situation to the management team.

What is the procedure of estimate reconciliation?

Estimate reconciliation is the process of updating a previously completed package in response to an estimate provided by a contractor for a policyholder.

What is the unit wt. of steel?

Steel's unit mass is calculated as the weight of steel divided by its volume. Typically, it is stated in pounds per cubic foot or kilograms per cubic meter. Steel has a unit mass of 7850 kg/m3 (kilograms per cubic meter)

If there is no reconciliation, what happens?

The clearing of invoices and the receipt of recoveries in accordance with contract terms will be delayed if there is no reconciliation. For materials that are not reconciled, certain organizations may specify recovering them at a penalty rate.

How are the completed work and the initial estimate reconciled?

Work completed must be reconciled with the BOQ or the base estimate, much like the accounting completed for the materials. The basic estimate could include impersonal numbers and rates.