Ajay Stb. Mud Block Ppt2003

8/9/2019 Ajay Stb. Mud Block Ppt2003

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Submitted by:

AJAY KATNAURI

B.Arch. (8TH SEM.)

06608


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The stabilised mud block is a masonry unit of cuboidal shape.This may be solid or hollow or interlocking.

The shape and size of a block is defined by the equipment used

in its manufacture.

The soil, raw or stabilized, for a compressed earth block (CEB) is

slightly moistened, poured into a steel press and then

compressed either with a manual or motorized press.

Auram hollow interlocking block 295

Stabilised mud block:


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SOIL SUITABILITY AND STABILIZATION FOR CSEB

Not every soil is suitable for earth construction.

Topsoil and organic soils must not be used.

Soil used for CSEB has following proportions:


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TARA-Balram Machine: Dsigned in New

Delhi for the manufacture of stabilised mudbrick.


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Boulder Foundation Construction Stage of Mud Block House

Stabilised Mud Block House for KYDC

Club

Stabilised Mud Block House for HYS

Club


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76 mm

230 mm

109 mm

Stabilised Mud Blocks


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TARA-Balram Machine:

This machine manufactures SCEBs by compacting raw earth

mixed with a stabiliser such as cement or lime under a

pressure of 20-40 Kg/cm2 using a manual press.

This machine is a perfect profit making machine for small

entrepreneurs.

Specification:

Size of the machine : 1500 x 600 x 1200 mm

Weight of machine : 180 kg

Size of block : 230 x 109 x 76 mm

No. of blocks per cycle : 2 Nos.

Type : Portable

Manpower required : 5-8Energy source : Manual

Compaction by : Pressure.

Compressive strength : 20 30 Kg/cm2

Stabilisation : 5 10 % Cement.


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CEB can be compressed in many different shapes and sizes.

For example, the Auram press 3000 proposes 17 types of

blocks for producing about 75 different blocks.

Some of the shapes are given below:


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Process:

The production of SCEB is based on the principle ofdensification of raw earth mixed with stabiliser (cement or

lime) in small quantities ranging from 5 -10% by weight of the

mix.

The production process incorporates 3 main stages:Sieving : Filling the mould. humid and wet curing

Batching : Moulding final stage

Mixing : Block ejection, transportation and stacking.


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DIVERSITY AND SELECTION OF THE PRODUCTS :

Module of the block: It is the block size plus the mortar

thickness. Select also the module with the thinnest mortar

joint possible.

Possibilities of different wall thickness: According to the

thickness, one can know if a block can be load bearing or not.

Area of the block: The bigger it is, the weaker the block willbe. A large area will require great compaction

energy:

Plain, hollow or Interlocking blocks? Each of them has

different possibilities, plain ones will be laid with a thick mortar

(1 to 1.5 cm); hollow ones will be laid with a thin mortar (0.5 to1 cm); the interlocking blocks will require a thin mortar (0.5

cm).


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Soil identification:

The main points to examine are:

Grain size distribution, to know quantity of each grain

size

Plasticity characteristics, to know the quality and

properties of the binders (clays and silts)

Compressibility, to know the optimum moisture content,which will require the minimum of compaction energy

for the maximum density

Cohesion, to know how the binders bind the inert

grains

Humus content, to know if they are organic materialswhich might disturb the mix


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Soil stabilisation:

Cement and lime are the most common ones. Others,

like chemicals, resins or natural products can be usedas well.

Many stabilizers can be used.

The selection of a stabilizer will depend upon the soil

quality and the project requirements:Cement is used for sandy soils and to achieve quickly

a higher strength.

Lime is used for very clayey soil, but takes a long time

to harden and to give strong blocks.

The average stabilizer proportion:

Minimum Average Maximum

Cement stabilisation 3% 5% No tech. max.

Lime stabilisation 2% 6% 10%


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ENERGY EFFECTIVENESS:

The production of earth-based materials consumes

much less energy and pollutes much less than fired

bricks.

SEB earth are much more eco-friendly.

Advantages as compared to fired bricks:

Pollution emission (Kg of CO2

/m2)

Energy consumption (MJ)

2.4 times less than wire cut bricks 4.9 times less than wire cut bricks7.9 times less than country fired

bricks

15.1 times less than country fired

bricks


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COST EFFECTIVENESS :

CSEB are most the time cheaper than fired bricks.

This will vary from place to place and specially according to

the cement cost.

The strength of a block is related to the level of compression

and to the quantity of stabiliser.

It means reduce the quantity of cement but not the cost

of the labour.In the context of Auroville, a finished m3 of CSEB masonry is

always cheaper than fired bricks.

19.4% less than country fired bricks and 47.2 % less thanwire cut bricks.


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ADVANTAGES OF CSEB:

A local material

A bio-degradable material

Limiting deforestation

A transferable technology

A job creation opportunityMarket opportunity

Reducing imports

Flexible production scale

Energy efficiency and eco friendliness

Cost efficiencySocial acceptance


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LIMITATIONS OF CSEB:

Proper soil identification is required or lack of soil.

Wide spans, high & long building are difficult to do.

Low technical performances compared to concrete.

Untrained teams producing bad quality products.

Over-stabilization through fear or ignorance, implyingoutrageous costs.

Under-stabilization resulting in low quality products.


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THANK YOU

Documents

Ajay Stb. Mud Block Ppt2003