Department of Civil Engineering
NWFP University of Engineering & Technology,
Peshawar, Pakistan

FIELD PRACTICING MANUAL
Prepared by:
Earthquake Engineering Center, Department of Civil
Engineering, NWFP, University of Engineering & Technology,
Peshawar, Pakistan

English Version
By:
Engr. Khan Shahzada*
July 2007
Copyright (C) All Rights Reserved* Lecturer, Department of Civil Engineering, NWFP, University of Engineering &Technology Peshawar, Pakistan. Graduate student of Earthquake Engineering, Building
Research Institute (BRI) and Graduate Institute for Policy Study (GRIPS) Japan.
www.nwfpuet.edu.pk

shah_civil@hotmail.com+92-91-9216775

ACKNOWLEDGEMENT
I am obliged to ALMIGHTY ALLAH who gave me the strength and ability to carry out thiswork and complete it successfully.
I

am

Civil

grateful

to

Prof.

Engineering,

Director,

Dr.

NWFP,

Earthquake

AkhtarUET,

Engineering

Naeem

Peshawar,

Khan,

Chairman,Pakistan

Center, Department

Department

of
Ali,

and

Dr.

Qaisarof

Civil

Engineering,

NWFP, UET, Peshawar, Pakistan for their permission, guidance and backup to prepare theEnglish version of Field Practicing Manual.
I would like to express thanks to my supervisor Dr. Tetsuro Goto of National Institute forLand Infrastructure and Management Tsukuba, Japan for his valuable advice andencouragement to work on the Field Practicing Manual which may also be helpful for otherdeveloping countries.
I am grateful to JICA participants from Pakistan Dr. Abdullah Yasar and Engr. Akhtar Ali
Kamboh for extending their cooperation and valuable suggestions.
I would like to thank the Government of Japan through Japan International Cooperation
Agency (JICA), Government of Pakistan and University of Engineering and Technology
Peshawar, Pakistan for giving me the opportunity to complete my master degree inEarthquake Engineering.

AND ALLAH SETTLED HOUSES A DWELLING PLACE FOR YOU (AL-QURAN)

GUIDELINES FOR STANDARD CONSTRUCTIONFirst Edition
February 2006

Prepared by:
Earthquake Engineering Center
Department of Civil Engineering
NWFP University of Engineering & Technology Peshawar

www.nwfpuet.edu.pk

drqaisarali@nwfpuet.edu.pk+92-91-9216396

WORKING GROUP ON FIELD PRACTICING MANUAL

Prof. Dr. Akhtar Naeem Khan

ChairmanDr. Qaisar Ali

Project Director

Engr. Muhammad Javed

MemberEngr. Zakir Hussain

MemberEngr. Amjad Naseer

MemberEngr. Syed Muhammad Ali

MemberEngr. Muhammad Ashraf

MemberEngr. Mansoor Khan

Member

www.nwfpuet.edu.pk

drqaisarali@nwfpuet.edu.pk+92-91-9216396

PREFACE
On October 8, 2005 a disastrous earthquake in the history of Pakistan having 7.6
Magnitude on Richter scale struck the northern parts of Pakistan and Kashmir. According to
the Government resources, almost 80,000 people died, thousands were injured and millions
became homeless.

Government of NWFP made a comprehensive plan for the resettlement of thesepeople. University of Engineering & Technology Peshawar was given a task to prepare amanual consisting of guidelines and recommendations for framing regulations to ensure
earthquake resistant construction. This Field Practicing Manual or Guidelines for standard
construction is reflection of the same. In this manual, efforts have been made to simplify
instructions for earthquake resistant construction and construction materials. This booklet
would almost be equally beneficial for the site Engineers, Contractors and masons
INSHALLAH.

CONTENTS
1. Construction Materials

Page Number

1.1 Cement1

1.2 Sand, Khaka and Gravel2

1.3 Water

2

1.4 Brick3

1.5 Concrete block5

1.6 Stone

6

1.7 Steel6

1.8 Mortar

7

1.9 Concrete

8

2. Wall Masonry
2.1 Brick Masonry

12

2.2 Block Masonry13

2.3 Stone Masonry13

3. Instructions for Earthquake Resistant Buildings
3.1 Brick, Block and Stone masonry Buildings

15

3.2 Reinforced Cement Concrete Buildings

18

4. Miscellaneous Instructions
4.1 Foundation

21

4.2 Framework

22

4.3 Steel mesh on the walls

22

4.4 Phase wise Construction of Concrete Buildings25

1. CONSTRUCTION MATERIALS
1.1 Cement:i.

Fresh cement is like a fine powder which is commonly available in sealed bags. On
opening the bag, cement starts absorbing moisture from the air and with the passage oftime, small and large lumps are formed Fig.1, which results in the decline of cement
strength. So the cement bag once opened should be used as soon as possible.

Lumps

Fig.1 Lumps in cementii.

The lumps in cement also appear if the sealed bags are placed for a longer time.
This is major indication of old cement and its use should be avoided.

iii.

Always use good quality cement. Avoid the use of poor quality cement.

iv.

Test can be carried out to assess the strength of the cement. This facility is available
in all the Engineering Universities and in most of the construction related
Government/non Government Institutions throughout Pakistan.

11.2 Sand, Khaka and Gravel:i.

Sand, Khaka and gravel should be free from dust and waste residuals. In the presenceof these, the strength of concrete and mortar decreases.

ii.

Always prefer machine crushed gravel. Fig.2

Fig.2 Machine Crushed Graveliii.

The gravel should be well graded containing fine and coarse aggregates. Concrete
prepared with same size of gravel is comparatively poor in strength.

iv.

The size of the gravel for concrete should be less than 3/4” (19mm).

v.

A material like coarse sand obtained from the crush machine during the process ofstone crushing is called khaka. A dust free khaka can be used safely in the wall
masonry.

1.3 Water:i.

Drinking water should be used in concrete and mortar. The use of contaminated water
reduces the strength significantly.

2

1.4 Bricks:
i.

Always use A-class bricks in wall masonry (Fig. 3)ii.

All the bricks should be of the same size.

iii.

The bricks should be properly burnt and there should be no damage or deformed
edges or sides.

Fig.3 First Class Bricksiv.

The quality of the bricks can be assessed by striking two bricks with each other. In
case of A-class bricks, ringing noise is produced. Moreover, if it is dropped from aheight of 4 feet on hard soil, it does not break. (Fig.4 and Fig.5).

3

Fig.4 Striking of two bricks with each otherFig.5 Dropping of brick from 4 feet height4

1.5 Concrete Block:i.

Ratio not more than 1:6:12 (1 part cement, 6 parts sand and 12 parts gravel) may be
used in the blocks for wall masonry. The block prepared with the ratio of sand andgravel more than aforementioned would be very weak the use of which can prove to
be dangerous (Fig.6).

Fig.6 Concrete Blockii.

The amount of water in the aforementioned concrete used for the blocks should notexceed 8 number measure of 5 Kg tin for each cement bag of 50 Kg (Fig.7).
Remember use of excess water in the concrete is very dangerous.

iii.

Cracked, deformed and broken edged blocks should not be used.

5

Fig.7 Five Kg oil tin to measure water for mortar and concrete

1.6 Stone:i.

If it is desired/specified to use stones in wall masonry then it should be in squareshape of appropriate size obtained from the mountains.

ii.

Use of boulders obtained from streams and rivers should be avoided as the walls ofthese stones causes huge loss during earthquake.

1.7 Steel:i.

Oil and rust free steel should be used. If a large quantity of steel is to be used, itsquality should be got tested from a recognized institute. All the Engineering
Universities and construction related most of Government and non Government
Institutions have this facility (Fig.8).

6

Fig.8 Material testing machine

1.8 Mortar:i.

Cement, sand and water for use in the mortar should be according to the instructions
described in the previous pages.

ii.

Constituents of the mortar i-e cement, sand or khaka should be mixed indry mode and after mixing two to three times, add water gradually and remix.

iii.

Water should not be added in one so that cement mixed water may not waste as runoff
during mixing.

iv.

Mortar should be prepared on a clean and metal led floor.

v.

Use of water in mortar should be appropriate so as to make its use easier. Rememberthat excess water reduces the strength of the mortar significantly.

vi.

After mixing of cement and sand, addition of water makes it glue like slurry which iscommonly known as mortar. As if glue is not used immediately, it is dried and turns
to waste. Likewise, if mortar is not used within almost one hour, will be dried likeglue and wasted. So the time limit of one hour is very much important. The use ofsuch mortar in the wall masonry proves harmful during earthquake.

7

vii.

Some masons get the mortar prepared in large quantity and use it for hours which is a
wrong way. The right thing is to prepare only that quantity of mortar which could be
used within an hour.

viii.

The mortar for the masonry should be of the ratio 1:6 (1 part cement and 6 parts
sand/Khaka). Mortar prepared with 1 part cement three parts sand and three parts
Khaka can also be used. It is notable that use of excess quantity of sand and khaka inthe mortar causes reduction in strength of the wall.

ix.

The ratio of mortar for plastering should be one part cement and three parts sand. The
wall should be wet at saturation level before plastering.

1.9 Concrete:i.

Cement, sand, gravel and water for concrete should be according to the above
mentioned instructions.

ii.

The constituents of the concrete should be mixed with the mixer machine (Fig.9). In
case of non availability of the machine, dry constituents should be mixed three to fourtimes with the help of shovels and after that gradually add water and remix properly.

Fig. 9 Concrete aggregates mixing machine

8

iii.

The concrete in columns, beams and slab should be of the ratio 1:2:4 (1 part cement,
2 parts sand and 4 parts gravel).

iv.

The optimum quantity of water may be used for making good quality concrete. The
quantity of water should not be more than 5 to 6 tin (5 kg empty oil tin) for one bag of
cement (50Kg) in the concrete prepared for columns, beams and slab. If gravel andsand is already wet, then reduce the amount of water. Remember the use of excesswater is extremely harmful for concrete strength.

v.

A simple way to assess the quantity of water in the concrete is that if it is taken in
hand and pressed, good quality concrete cement slurry does not flow out of the fingers(Fig.10).

Flow of cement
water out of thefingers

Fig.10 Pressing of concrete in hand

9

vi.

After properly mixing cement, sand and gravel when water is added, cement makeglue like slurry. Glue if not used immediately, dries and is wasted. Likewise concrete
if not used within an hour dries and is wasted. So it is important that concrete should
be used within an hour after water is added otherwise the beams, columns and slabs
made with this concrete will be weak in strength.

vii.

If the concrete has to be dropped from a height, it should not be more than 6 feetbecause it leads to segregation of concrete which causes reduction in strength.
(Fig.11).

Fig.11 Falling of concrete from a heightviii.

Concrete should be compacted with the help of vibrator after adding each layer of 6 to
12 inches (Fig.12). Remember that strength of vibrator compacted concrete is much
more than that of otherwise. If vibrator is not available, concrete should be compactedwith steel rod.

ix.

Keep continued curing of columns, beams and slabs made of concrete for 14 days.

10Fig.12 Vibrator

11

2. WALL MASONRY
2.1 Brick Masonry;i.

Always use A- class bricks for wall masonry.

ii.

Cement, sand or cement, sand and khaka mortar can be used for masonry work.

iii.

Thickness of mortar between two brick courses should not be more than 3/8” in any
case. Thicker the mortar layer, weaker the masonry work would be. (Fig.13).

Mortar thicknessiv.

Fig.13 Brick Masonry

Soak the bricks in water for 1 to 2 hours before their use. In this way, bricks do notabsorb moisture from mortar and the brick mortar adhesiveness increases (Fig.14).

v.

Use of old bricks should be avoided. If it is unavoidable, then those should be cleaned
properly. It should be free from any type of dust/mortar.

vi.

Minimum 7 days curing is required for masonry work. Use drinking water for curing.
Remember improper curing may reduce the strength of wall significantly.

vii.

Curing of plaster should also be carried out for 7 days.

12Fig.14 Soaking of bricks in water before use

2.2 Block Masonry:i.

Always use good quality blocks for the masonry.

ii.

Cement, sand or cement sand and khaka mortar can be used for the masonry work.

iii.

Maximum thickness of mortar between two courses should not be more than 3/8”.
Thicker the mortar layer, weaker the masonry work would be.

iv.

Minimum 7 days curing is required for masonry work. Use drinking water for curing.
Remember improper curing may reduce the strength of wall significantly.

2.3 Stone Masonry:i.

Well chiseled and well shaped squared stones should be used. Use of un- chiseledstones is extremely dangerous because strong grip does not develop with mortar.

ii.

In a 15 inch thick wall install 15 inch through stone after every three to four feet(Fig.15). This will provide a homogeneous bond with other stones and will strengthen
the wall. Always keep the length of the through stones equal to the thickness of the
wall.

13

Through stone

Through stoneFig.15 Stone Masonry14

3. INSTRUCTIONS FOR EARTHQUAKE RESISTANT
BUILDINGS
3.1 Brick, Block and Stone masonry Buildingsi.

The plan of the building should be square or rectangular.

ii.

For rectangular plan the length of building should be less than 4 times of its width.

iii.

Thickness of wall should not be less than 9” and 15” for brick masonry and stone
masonry respectively.

iv.

Keep number and size of windows, doors and ventilators in the building to aminimum. Remember more the doors and windows in the walls of building, more thedangerous it would be during earthquake.

v.

It is extremely important to provide concrete beams at different levels in the walls to
make the bricks, blocks or stones constructed buildings earthquake resistant. (Fig.16)
Roof Band
Minimum 9 inch

Lintel Band
Window

9 inchColumnMinimum 6 inch

Door
6 inchNo.4, 3/8 inch diameter steel bars
Plinth Band
1/4 inch diameter stirrups at 6 inch spacing

Fig. 16 Bands at different levels of a wallvi.

Three types of beams have been shown in Fig.16. The beam at the floor level is usuallycalled as Plinth Band or Plinth beam. The beam at the doors and windows level iscalled lintel band or lintel beam while the beam at the roof level is called roof band or
roof beam.

15

vii.

The beam at windows and doors level is very essential. It must be kept in mind thatbeam should not only cover the windows or doors but should also be provided
throughout the walls length as shown in Fig.16. Beam should also be provided on
those walls which don’t have windows or doors. The lintel beam on all the walls
should be connected as shown in Fig.17.

Roof Band
Lintel Band

ColumnPlinth Band

Fig.17 Columns at the corners of rooms of Buildingviii.

Severe damages to the corners of the buildings have been observed during earthquake.
Hence it is better to provide concrete columns on each corner of the room. In addition
to this, 1/4 inch diameter, 3 feet long two steel rods should be provided in the cornersof walls after each 2 feet height. The details of strengthening of corners have beenshown in Fig.18.

ix.

Roof slab should be properly tied with roof beam or roof band.

x.

It should be kept in mind that distance of doors and windows should not be less than 2feet from the corners of the walls.

16

6 inch spacing between 1/4 inch diameter stirrups
at
3 feet long 1/4 inch diameter steel bars
No.4, 3/8 inch diameter steel rods

No.4, 3/8 inch diameter steel bars

Plinth Band

Concrete Column
Fig.18 Column and steel rods at the corner of wall17

3.2. Reinforced Cement Concrete Buildingsi.

Hook of the steel stirrups in beams and columns should be at an angle of 1350 Fig.19.

ii.

Hooks of the consecutive stirrups should be at the opposite corners Fig.19.

iii.

Lap should be provided in the middle height of the column Fig.20.

iv.

Lap of the beam should be within the quarter length of the beam Fig.20.

v.

The distance between the two stirrups at the lap portion should be 3 to 4 inches.
Fig.20.

vi.

Distance between two stirrups near joints should be 3 to 4 inches. Fig.20

vii.

Hook must be given at the end of the beam Fig.20.

Hook on opposite
corners of stirrups
Hook of 135o

Fig.19 Hook on opposite corners of stirrups.

18

Stirrups spacing: 3 to 4 inch
Stirrups spacing:
3 to 4 inch
Place for lap in beam

Beam column
connection

Place for lap in column

Hook in beamStirrups spacing: 3 to 4 inch

Fig.20 Details of lap and beam column connection

19

viii.

Length of the Lap in slab, column and beam should be according to the following
table.

Diameter of Bar

Length of Lap in
Roof slab
Grade-40

Grade-40

Grade-60

16”
21”
26”
-

21”
28”
35”
42”
70”
80”

21”
28”
35”
42”
70”
80”

3/8”
1/2”
5/8”
3/4”
1”
9/8”
ix.

Length of Lap inColumn/Beam

Clear cover between steel and concrete on the outer side should be according to thefollowing table.

Roof Slab

3/4”

Beam/Column

1.5”Foundation

3”20

4. MISCELLANEOUS INSTRUCTIONS
4.1 Foundation:i.

Minimum foundation depth and width of one or two storey building should be 3 feetand 2.5 feet respectively.

ii.

Some people use stone up to the plinth level for wall masonry. As explained earlier, if
it is required to use stone in wall masonry, well chiseled and well square shaped
mountainous stones should be used. Use of un- chiseled stones obtained from streams
and rivers causes severe damage during earthquake. Thus use of these should be
avoided. It is better to use good quality bricks or blocks instead of stones.

iii.

Foundation details have been shown in Fig.21 which is satisfactory for one or two
storey house. However if the soil bearing capacity is very low then RCC should be
used in foundation as shown in Fig.22

Floor Level

Floor Level

DPC

Plinth Beam
Ground Level

Ground Level
Brick Masonry
Brick Masonry

Steel Rods

Concrete (1:3:6)
Concrete (1:4:8

Fig.22 RCC Foundation

Concrete (1:3:6)
Concrete (1:4:8)
Fig.21 PCC Foundation

21

4.2 Framework:i.

As far as possible shuttering/framework should be of steel. Fig.25-26.

ii.

There should be no hole in the shuttering so that cement slurry or concrete may not
flow out.

iii.

Surface of the shuttering should be clean and smooth.

iv.

Shuttering should be so strong that it could bear the weight of the fresh concrete.

v.

Shuttering beneath beam and roof slab should be provided for at least 14 days so that
concrete gains its strength. However column shuttering can be removed after twodays.

4.3 Steel mesh on the walls:i.

Collapsing of walls causes maximum causalities during earthquake. To protect thewall from collapsing, steel mesh should be fitted on the wall as shown in the figure.
Remember that the mesh should be firmly tied with the columns and beams provided
in the walls at different levels.

ii.

Use 18 gauge steel wire mesh with 3/4 to 2 inch spacing. Fig.23-26

Drill machine

18 gauge wire mesh of
1/2 inch size

Ravel plug

1.5 inch screw

Washer of 1
inch size

Fig.23 Accessories for wire mesh on the wall22

Fig.24 Drilling for fixing the mesh
Screw and washer(9 inch distance)

Mesh

Fig. 25 Steel wire mesh on wall

23

MortarMesh

Fig.26 Plastering on steel wire mesh24

4.4 Phase wise Construction of Concrete Buildings

1. Spread concrete 1:4:8 in foundation after excavation having thickness 4 inch and smooth surface.

2. Tie the ends of foundation and column steel bars. The length of the steel bars in thecolumn should be enough so that the lap comes in the middle of the height of thecolumn. Support the bars in the column to stand at its original position.

25

3. Spread concrete in the foundation after fixing the framework and then place 3-4 inch
thick starter of the column.

4. After fixing column framework, fill with concrete up to the lap level.

26

5. After placing the wall foundation, complete masonry to DPC level in between thecolumns.

6. Tie the column bars by giving suitable lap. The length of the steel bars in the column
should be enough so that the next lap comes in the middle of the height of 2nd floor.

27

7. After fixing framework, fill column with concrete up to 1st floor.

8. After fixing framework, tie the steel bars of beam and slab and try to fill with concrete
simultaneously.

28

9. Fill concrete in the columns up to the lap level of 2nd floor after fixing framework.

Position of Lap in column

10. Repeating the above steps, complete the remaining floors.

29

11. Complete wall masonry. Fix steel wire mesh on inner side of wall and plaster.

12. Fill concrete around the building to protect it from rain water.

30