comparitive study of clay bricks and stabilised soil-cement ...

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International Journal of Civil Engineering and Technology (IJCIET) Volume 9, Issue 2, February 2018, pp. 926 933, Article ID: IJCIET_09_02_089 –Available online at http:// ttp://iaeme.com/Home/issue/IJCIET?Volume=9&Issue=2 hISSN Print: 0976-6308 and ISSN Online: 0976-6316

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COMPARITIVE STUDY OF CLAY BRICKS AND STABILISED SOIL-CEMENT BRICKS WITH

AND WITHOUT FOUNDRY SAND AS REPLACEMENT

S Soundharya.

Assistant Professor, Department of Civil Engineering, Vels Institute of Science, Technology and Advanced Studies (VISTAS),

Chennai, Tamil Nadu, India

K. Harish Kumar, A. Mahathir Mohamed, K. Manikandan Final Year student, B.E. Civil Engineering, Department of Civil Engineering,

Vels Institute of Science, Technology and Advanced Studies (VISTAS), Chennai, Tamil Nadu, India

ABSTRACT An adequate shelter is a basic human need, yet about 80% of the rural populations

in developing countries still live in spontaneous low quality settlements, as they cannot afford the high cost of building materials. One alternative for the expensive materials is to use natural soil stabilized bricks because they have been identified as low cost material with the potential of reducing the problem of living in sub-standard

houses. An upcoming and worldwide spoken concept is the development of green environment, where the use of natural building materials are encouraged in order to

reduce the environmental heat evolved from the man-made building materials. The above said technology uses the available soil on site, which is stabilized with a small amount of cement or/and lime depending on the characteristics of the soil so as to improve the engineering properties of the produced blocks. This project is also done to show the comparison between the clay bricks and stabilized soil cement bricks with and without foundry sand in terms of various structural properties like compressive strength, durability, etc., and also the cost comparison is being carried out.

Key words: soil-cement bricks, ecology, stabilization, binder material, foundry sand. Cite this Article: S. Soundharya, K. Harish Kumar, A. Mahathir Mohamed, K.

Manikandan, Comparitive Study of Clay Bricks and Stabilised Soil-Cement Bricks with and without Foundry Sand as Replacement. International Journal of Civil

Engineering and Technology, 9(2), 2018, pp. 926 933. -ttp://iaeme.com/Home/issue/IJCIET?Volume=9&Issue=2 h

Comparitive Study of Clay Bricks and Stabilised Soil-Cement Bricks with and without Foundry Sand as Replacement


1. INTRODUCTION Soil being the most vital raw material, is used widely in many developing countries and in

rural areas as an efficient means of housing for a larger number of people with minimal resources. Cement, steel, timber, plastics and glass are the commonly used construction

materials. A huge expenditure on non-renewable resources is required for manufacturing these raw materials and this is detrimental to the environment. For example, steel and cement factories emit toxic gases leading to air pollution. Excessive quarrying of limestone for lime

burning or cement manufacturing has disturbed the ecological balance. In addition, these conventional materials are usually transported over great distances thus contributing to the spending of fossil fuel energ y.

The ecological concerns can be addressed by adopting earth-based construction techniques. The use of earth in the form of burnt bricks is harmful to the environment. The burning of bricks in the vicinity of fields damages plant life while the extraction of soil

for brick making causes collection of water in pools creating unhygienic conditions and erosion of good agricultural soil.

The s a building material, has both pros and cons depending on soil’s characteristics a itsrequirements, applications and the context. Use of earthen materials is advantageous since it is

available in large quantities, at low price, easy to use and fire resistant etc., and the short comings are principally low mechanical characteristics, unsatisfactory resistance to

weathering and liability to volume changes especially in the case of clayey soils. The burnt brick walls consume significant amounts of fuel energy. Since there is energy crisis,

alternatives to wood such as coal, are not cheap either and in any case are desperately needed for other purposes including cooking. Hence there is a need for an alternative way of using soil wall construction.

2. STABILIZATION SOIL WITH CEMENT OFSoil stabilization in the broadest sense is the alteration of any property of a soil to improve its engineering performance. The chief factors affecting the quality of soil-cement are soil type, cement content, compaction and method of mixing. Of these the soil type is by far the most

important factor since, if it is unsuitable, little can be done to make the soil-cement satisfactory

3. COMPRESSED STABILIZE SOIL-CEMENT BRICKS D Soil cement blocks are cost effective and energy efficient alternative materials to the normal burnt clay bricks used for construction of buildings. Soil cement blocks are also known as stabilized mud blocks (SMB) or stabilized compressed earth block (SCEB).Ordinary Portland cement is the most usual stabilizer added 5 to 10% by weight to the soil. Other stabilizers like lime, pozzolana or a combination of cement and lime are also used. Building with earth is one of the ancient technologies which still remain alive in the space untouched by civilization. Interests on sustainable green building material has created compressed earth stabilized blocks

that attracts people for its low carbon content especially in the production stage. The properties and benefits of CSEB compared to conventional brick especially in strength and durability had already been demonstrated in past researches. The proper use of stabilizers with

right compressibility will improve the performance of CSEB. Results were found that compressed stabilized earth bricks are comparable with every respect of burnt clay brick.

CSEB are ultimately more advantageous compared to conventional clay bricks in terms such as green environment, eco-friendly, strength comparison, durability and thermal

S. Soundharya, K. Harish Kumar, A. Mahathir Mohamed, K. Manikandan


conductivity. The average density of CSEB is almost equivalent with the common brick (Fetra Venny Riza et al, 2011). CSEB promotes healthier building material and cost reducing

not only in production but also in service cost. This project is to show the percentage of reduction in rate on the usage of CSEB. Based on past review of experimental and field

investigation on clay bricks and CSEB, results showed that major usage in the world for construction is clay bricks. Past results showed that many researches showed that

environmentally friendly bricks are a major requirement and the manufacture of clay bricks also requires high energy to burn due to the emission of Co2 gas from this process. The

reduction in of transportation time, cost and attendant pollution can also make CSEB more environment friendly than other materials. This project is to show the comparison in quantity and overall rate of CSEB and conventional clay bricks (Sadek Deboucha et al, 2010).

4. FOUNDRY SAND The sand moulds that are used in metal castings are usually recyclable. When repeatedly used,

they lose their characteristics and become unsuitable for further use in the manufacturing process, which are then discarded as a waste. They are of two types as ulding sand and mocore sand. Molding sand is the sand which is compacted and shaped according to a pattern that is going to be produced.

The major components in foundry sand are Quartz sand / silica sand (70-80%) Clay (5-15%) Additives (25%) Water (up to 4%).

The dust particles obtained as a by-product are the dust particles which are cleaned sand and large lumps of fine sand. These used sands contain a variety of binders depending on the specific application for which they were used. A binder is defined as a material that gives binding action to the sand mixture. Clay is the most common binder used in moulds. Typical moulding sand contains approximately 4% to 10% clay. Hence this foundry sand is replaced partially and fully here, in order to achieve the properties of clay in binding.

5. MATERIALS METHODOLOGY ANDConventional soil-cement blocks have their compositions of the following two types. Type 1

Soil or raw earth OPC (3-6%) Water (10-11%) Sand + Crushed stone dust (optional)

Type 2 Soil or raw earth Water (10-11%) Sand + Crushed stone dust (or) Fine gravel Lime and Pozzolana Cement are the alternative soil stabilizing materials.

Optimum percentage of materials (Sand, Fine Gravel) = 75% Silt + Clay = 20% Cement = 5%



In this project type 2 materials for casting CSEB are used. Initially, the soil samples were tested for their suitability. The type of soil was found to be silty sand or poorly graded sand – silt mixture. The tests for Atterberg’s limits were done and the average water content was

found to be 41.1% and the specific gravity was found to be 2.685 for sand and 2.695 for fine gravel. The variation of shear strain was noted using UCC test. Totally, there were four sets of bricks that were cast. Each set was cast by varying the proportions of the materials as below.

There are four sets of bricks cast. 230 x 115 x 75 mm and Each brick mould was of size

compression was given to the bricks using hydraulic machine compress.After carrying out the tests for the sample, four sets of mix ratios were arrived for casting stabilized soil-cement bricks.

SET-1 (Varying silt + clay content) by Weight of Blocks

SET-2 (Varying Cement Content) by Weight of Blocks

SET-3 (Partial replacement of sand by foundry sand) by Weight of Blocks

SET-4 (Total replacement of sand by Foundry sand) by Weight of Blocks

In set-1, the clay and silt content was varied from 20% to 40% and cement content was fixed as 5%. In set-2, the silt and clay content was kept constant as 20% and cement content was varied from 4% to 6%. In set-3,the clay and silt content was varied from 20% to 40%and cement content was fixed as 5%. Here, the sand was replaced partially with foundry sand. In set-4, the silt and clay content was kept constant as 20% and cement content was varied from 4% to 6% and the sand was totally replaced by foundry sand. Each set had 15 numbers of bricks out of which every 3 bricks were subjected to different days of curing and testing. The

stabilized soil-cement bricks were cast in a fly ash brick making unit, by mixing the ingredients in required proportion and then placed in a hydraulic compress of capacity 26.3 kg/m2. Then after attaining full compaction, the denser bricks are removed from the mould through a belt conveyor. Each set was cast and the compressive strength values for 3, 7, 21 and 28 days respectively were determined and then a comparison on costs was arrived as a

percentage. This cost comparison was done by proposing a simple residential plan and arriving at their estimate of construction.

6. TEST RESULTS AND DISCUSSION

Figure 1 Chart showing variation in compressive strength for Set-1



Figure 5 Chart showing overall variation in compressive strength of all sets of bricks

It is found that the compressive strength values for set-1 gradually decreased as the percentage of clay increased and cement content was kept constant. In set-2, the compressive strength values decreased as the percentage of cement varied from 4% to 6% and the clay content being kept constant at 20% by weight of blocks. In set-3, where the sand was replaced partially with foundry sand, the brick containing 20% clay ad 5% cement exhibited a higher

compressive strength value than the other two mixes. The compressive strength kept escalating in set 4 for every mix, where sand was totally replaced with foundry sand. This is

because of the amount of clay that is present in the foundry sand. Foundry sand exhibits binding property by itself due to the silica-clay content present in it. In addition, when cement is used as stabilizer, the set-4 bricks exhibited excellent strength properties.

Figure 6(a) Compressed CSEB Casted CSEB samples Figure 6(b)

7. CONCLUSIONS It is found that the rate of CSEB is Rs.9.3 per brick which is higher than the rate of

conventional clay bricks, but the overall cost of construction of the building using CSEB has been reduced upto 67% by the cost of clay bricks.

The strength has been found to be very high of 11.23 N/mm2 for the blocks casted using total replacement by foundry sand.



For a given percentage of cement, there is a range of clay content in which the blocks satisfy the strength requirement. Above and below this range the strength will be less.

The soil cement blocks with 4% - 5% of cement satisfy the dry compressive strength requirement only with actual clay content of 20% at 41.1% of water content.

Due to the high clay content (15%) in foundry sand, the bricks replaced with foundry sand totally for sand, exhibited very high compressive strength.

Thus, the compressed stabilized soil-cement bricks are very economical and eco-friendly to the environment and could achieve a desirable compressive strength.

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