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1. Hollow core interlocking BlocksHollow core interlocking Blocks
Part 1
Appropriate technologies
Ar. Manav Mahajan

2. BRICK- THE MOST FUNDAMENTAL BUILDING UNIT
THE MOST FUNDAMENTAL BUILDING UNIT
HAS BEEN GROSSLY MISUNDERSTOOD

3. NANAKSHAHI BRICKS
LAKHORI BRICKS
BRITISH BRICKS
MODULAR BRICKS

4. BRICK- THE MOST FUNDAMENTAL BUILDING UNIT
WHY DOES A WALLING MATERIAL
REQUIRE A CRUSHING STRENGTH OF 150
KG/SQ.CM?
UNIFORMLY DISTRIBUTED LOAD ON A
WALL IS LESS THAN 0.5 KG/SQ.CM
SOIL BEARING CAPACITY IS LESS
THAN 2 KG/SQ.CM

5. BRICK- THE MOST FUNDAMENTAL BUILDING UNIT
WHAT IS THE CRITERIA FOR AN APPROPRIATE WALLING MATERIAL?
CRUSHING OF THE BRICK IS A DIRECT CONSEQUENCE OF IT’S
SURFACE REQUIREMENTS
•NON-ERODABLE IMPERMEABLE DIAPHRAGM
•LEAN BACK-UP MATERIAL WITH APPROPRIATE LOAD BEARING
CAPACITY
•LOW THERMAL CONDUCTIVITY
•COLOUR AND TEXTURE

6. NON-ERODABLE IMPERMEABLE DIAPHRAGM
WATER FLOODED TO
FACILITATE CURING OF
MUD MORTAR USED
FOR APPLICATION OF
CLADDING.
ROPE WITH STONES
HANGING ON EITHER SIDE
TO ENSURE THAT THE
CLADDING MATERIAL
STAYS IN PLACE.
CLADDING MATERIAL
APPLIED
SIMULTANEOUSLY
WITH LAYING OF
RUBBLE MASONRY.
SECTION SHOWING TRADITIONAL METHODS
APPLICATION OF CLADDING
TODAY, CLADDING IS DONE AFTER COMPLETION OF MASONRY WORK.
DUE TO IMPROPER CURING OF MORTAR, CLADDING IS OFTEN FOUND TO DE-LINK FROM
THE WALL.
HORIZONTAL STONE
SLAB.
VERTICAL CLADDING
MATERIAL
SUPPORTED ON
HORIZONTAL SLAB.
Surya hotel,Delhi - CLADDING FALLING OFF WALLS DUE TO WRONG METHOD OF
APPLICATION

7. Solution to the problemSolution to the problem
HOLLOW CORE INTERLOCKING BLOCKS

8. LOCK PINS
M.S. HOLLOW
PIPE
GUDGEON PIN
M.S MOULD
INTERLOCKING BLOCK MOULD

9. STEPS OF CONSTRUCTION:STEPS OF CONSTRUCTION:
CASTING OF THE
BLOCKS:
1. Mixture of block is prepared
using cement, sand, aggregate and
other waste materials.
2. Coating of burnt oil on mould
so that that the concrete mix does
not stick.
3. Finishes laid on plastic sheet
inside mould.
1.1.
a.a.
1.b1.b
..
22
33

10. STEPS OF CONSTRUCTION:STEPS OF CONSTRUCTION:
CASTING OF THE
BLOCKS:
4. Rich cement slurry in the ratio
1:6 is poured over the finishes to
form the first impermeable
diaphragm.
5.The concrete mix is filled with
compaction done at regular
intervals.
6.Once the mould is half filled, a
hollow tube is passed through the
holes for creating the hollow
core.
4.b4.b
..
4.a4.a
..
5.a5.a
..
5.b5.b
..
6.a6.a
..
6.b6.b
..

11. STEPS OF CONSTRUCTION:STEPS OF CONSTRUCTION:
CASTING OF THE BLOCKS:
7.The remaining mould is
filled and the mixture
compacted.
8. Surface is smoothened and
a
layer of rich cement
slurry
with or without other
finishes
is poured.
9.After initial setting, the
moulds are carefully
removed from the diagonal
edges few minutes after
casting and left for drying for
about 48 hours to attain
strength.
7.b7.b
..
7.a7.a
..
8.a8.a
..
8.b8.b
..
8.c.8.c.
9.a9.a
..
9.b9.b
..

12. REMOVAL OF MOULDREMOVAL OF MOULD
9.c.9.c. 9.d9.d
..
9.e.9.e. 9.f.9.f.

13. NON-ERODABLE IMPERMEABLE DIAPHRAGM – HOLLOW CORE INTERLOCKING BLOCK
• INTEGRATED NON-ERODABLE
IMPERMEABLE DIAPHRAGM.
• IN THE HOLLOW CORE INTERLOCKING
BLOCKS, THE IMPERMEABLE NON-
ERODABLE DIAPHRAGM IS PROVIDED FOR
DURING THE TIME OF CASTING ITSELF.
• THE CLADDING MATERIAL WILL NEVER
DE-LINK.

14. turning trash into
cash
HOLLOW-CORE
INTERLOCKING
BLOCK
Canvas for the creativity of the
Artist and Artisan
Filling of waste polythene in
the hollows provides for
better thermal insulation.
Artwork with
Effective use of
Waste Materials
Thermal Lag of
Paper-mache block
is higher than brick

15. 2-HR FIRE
RATING
SAVES
TRANSPORTATIO
N COST
SPEEDY
PRODUCTION
INTERNAL/
EXTERNAL USE
LIGHT WEIGHT
GREEN PRODUCT COST EFFECTIVE EASY ASSEMBLY
STRONG & DURABLE SIX BEST PRODUCTS 2001

16. CROSS-STITCHING THE WALL
Diagonal
Transfer of Thrust
Electrical conduits and pipes
accommodated in the hollow
core

17. HOLLOW CORE INTERLOCKING BLOCKS
TYPES OF BONDS

20. Making Paper Mache
A mixture of cement,
aggregate and 50% paper
mache
Women making paper-mache
blocks
Acrylic cutouts embedded in the diaphragm helps the children
identify the various characters and the vibrant colors add cheer
to the building.
Creating the
pattern
Concretizing
the pattern
with white
cement
Lean backing of
paper mache and
concrete
BUILT OF PAPER-MACHE

21. HOLLOW-CORE INTERLOCKING BLOCK BEING MADE AT HANDS-
ON WORKSHOP AT Anangpur Building Centre

23. HOLLOW CORE INTERLOCKING BLOCKS
INTEGRATION OF THE ARCHITECT, ENGINEER, ARTIST AND THE ARTISAN.