Experimental Study of Industrial Waste in CSCE Block

Author Name(s): Vaishali Rajurkar, Dr. Anil Chitade
Author Email: rajurkarvj@rknec.edu

Abstract

In recent years innovations in technology and increasing demand of materials in construction industry have led to the exploitation of natural resources. Also due to rapid industrialization a huge amount of waste is generated which creates several problem on environment, the safe disposal and reuse of such waste is a major concerned. In this study, the effective and optimum use of such waste to replace natural sand is studied. On the other hand day by day increase in temperature to climate change increases the operational cost of a building to overcome such situation natural soil can be use as an ideal construction material, which has potential to reduce carbon footprint. In this study locally available non swelling soil is selected for investigation. Cement stabilised compressed earth (CSCE) blocks are prepared at varying percentage of demolishing waste (DW) to replace natural sand and Fly Ash (FA) to improve strength property of block. The optimum percentage of DW with soil is investigated. Optimum combination obtained further studied for effect of FA. The cube compressive strength and secant modules is varying with fly ash content and curing period, there is negligible deviation in dry density mostly within 10% of FA. Due to pozolonic effect cube compressive strength increases with increase of FA up to 10%. Further increase in fly ash reduces density of material and ultimately strength of CSCE blocks.

Introduction

In recent year, rapid urbanisation and infrastructural development all over the world which required energy in their manufacturing and transportation process. The construction material like cement, steel etc. requires huge amount of energy and produce high level of greenhouse gas. Especially the modern infrastructures are energy intensive and produce massive carbon dioxide [20]. To fulfil the day by demand of construction industry, large amount of material like sand and aggregate are required, cause exploitation of natural resources results to scarcity of building materials. Therefore the replacement of such courser material by the material which can be waste product of different industries such as granulated blast furnace slag, mine tailings, demolishing waste etc is required. Recycling and reuse is the another important key concerned for sustainable development. As it is well known, Thermal power plants produces ample quantity of fly ash which is in suspended form due to its low density, in atmosphere causing irreversible environmental harm. Construction industry is the biggest industry which utilises fly ash as a replacement of cement by supplementary cementing material has to be utilized in construction industry.

Conclusion

A laboratory experimental study was performed on compressed earth blocks consisting of local non swelling soil, Demolishing waste fly ash, and cement. From the study, the following conclusions are drawn.  In the trail experimental studies wet strength is obtained just by taking the different percentage of local soil and demolishing waste stabilised with 8 % of cement of total weight of mix. The best results are obtained at 45 and 40 % of soil (M4 & M5 group). Further these groups are added with 5, 10 and 15 % of FA just curtail the cement by 1% as a partial replacement of cement.  As addition of FA increases the density up to certain extent further increase of FA reduces the density of mix and it more heterogeneous and ultimately its strength. The addition of FA up to 10-15% may suggest using in the blocks for sustainable construction.  Demolishing waste can be effectively used in such construction as a replacement of natural sand to restrict the mining of natural material. Also recycling and reuse of such material provides the ideal solution of waste management.  On 7 days curing, the rammed earth material can attain the wet compressive strength up to 25%–52% higher than those uncured material whereas on 7 to28 days of curing the rammed earth material can gain 51% – 73% of strength when blended with cement.  The cube compressive strength values are in the range of 160 to 406 kPa for 7 days curing and 200 to 435 kPa for 28 days curing when blended with cement and FA.  Higher compressive strength and stiffness is observed with increasing fly ash and DW and also with curing period and cement and the stress-strain curve changes from a ductile to a brittle behaviour.  As non availability of red lateritic soil in central India, The surrounding soil can provide better solution for rammed earth construction, and can be used for load bearing structure. Earth material shows better thermal performance therefore suggested to use for low cost housing or in hot aired region which reduces the operational construction of building for entire life span of the structure.  Use of local material reduces the cost of transportation, the manufacturing of construction material is energy intensive whereas unprocessed material save energy and also reduce carbon footprint.

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