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USE OF STABILIZED BLOCK IN HOUSING PROJECT

Submitted by,Aboobacker Siddique A M4al13cv004VII semester-A sectionAIET Mijar

Submitted to,

Asst.Prof.NithendraAIET Mijar

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CONTENT INTRODUCTION PROCEDURE FOR MAKING CSEB SOIL IDENTIFICATION SOIL STABILIZATION COST EFFECTIVENESS ADVANTAGES CONCLUSION REFERENCE

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INTRODUCTION

A compressed earth block (CEB), also known as a pressed earth block or a compressed soil block, is a building material made primarily from damp soil compressed at high pressure to form blocks.

Compressed earth blocks use a mechanical press to form blocks out of an appropriate mix of fairly dry inorganic subsoil, non-expansive clay and aggregate.

If the blocks are stabilized with a chemical binder such as Portland cement they are called compressed stabilized earth block(CSEB) stabilized earth block(SEB).

Typically, around 3,000 psi (21 MPa) is applied in compression, and the original soil volume is reduced by about half.

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Procedure for Making CSEB (Compressed Stabilized Earth Blocks) Collected the soil sample. Test for soil classification. Various mixing of ingredients/stabilizers with clay soil

and sand varies in percentage of mixing. The various mixes are placed in the proposed brick

mold. The mold is compressed in a process (manually

compress). Then it is dried for 28 days. Strength determination on UTM/CTM.

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Soil identification can be performed with sensitive analyses.The main points were examined as: Grain size distribution to know quality of each

grain size. Plasticity characteristics to know the quality and

propertiesof each of the binders.

Sample Details : Red Earth Plastic Limit =56% Liquid Limit=66% Plasticity Index = 10 =Slightly plastic LI= 1, hence the remoulded soil is at the liquid

limit and ithas un-drained shear strength of about 2KPa.

Soil Identification

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Clay soil being mixed with 7%-10% Lime

Sandy soil being mixed with 5%-7% cement

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LOCAL PRODUCTION OF CSEB MACHINES

Types of press Cost of press(Rs)

Local production potential

Time of manufacturing

Normal press 50000 Yes 10-15daysInterlocking press

60000 Yes 10-15days

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CSEB Production capacity per day

Types of SCEB

Sizes of SCEB No of SCEB/house

Daily output/machine

No of labour/machine

Compressive strength

Standard Block

12*6*6 2100 225 2 550 psi

Interlocking

12*8*6 1550 190 2 550 psi

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Soil stabilisation Many stabilizers can be used. Cement and lime

are the most common ones. The selection of a stabilizer will depend upon

the soil quality and the project requirements. Cement will be preferable for sandy soils

and to achieve quickly a higher strength. Lime will be rather used for very clayey

soil,but will take a longer timetoharden and to give strong blocksThe average stabilizer proportion is rather low:

These low percentages are part of the cost effectiveness of CSEB

MINIMUM AVERAGE MAXIMUMCement Stabilization

3% 5% No technical maximum

Lime Stabilization

2% 6% 10%

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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 cost break up of a 5 % stabilized block would depend

on the local context. It would be within these figures, for manual equipment with an AURAM press 3000:

Labour: 20 - 25 % Soil & sand: 20 - 25% Cement: 40 - 60 % Equipment: 3 - 5 % The strength of a block is related to the level of

compression and to the quantity of stabiliser

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This implies that to reduce the cost of a block one should try to reduce the quantity of cement but not the cost of the labour with unskilled people.

One should also not cut down the cost of the press with cheap quality machines, which would not last and would not give strong blocks.

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ADVANTAGES OF CSEB

A local material A bio-degradable material An adapted material A transferable technology Limiting deforestation Management of resources A job creation opportunity Market opportunity

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Cost efficiency Durable Non-Toxic Fire and pest resistant Reducing imports

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Conclusion CSEBs are eco-friendly and as these blocks are

un-burnt products, during production no coal or burningmaterial is needed. So, it does not produce any harmfulgases during production.

Without utilization of stabilizer, the strength of CSEBobtained is very less or negligible. So, mixing of stabilizerwith sand and clay in CSEB is must.

Easy and simple technology Creates employment opportunities Reduce dependency on import of bricks Making house affordable

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REFERENCE Wikipedia CSEB building construction Low cost housing projects

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