Marble Slurry
Transcript of Marble Slurry
Guided by;Asst. Prof. Soumya Kuriakose
Presented by;Jewelshah Suresh V.
Introduction Marble Industry in India. Environmental Impacts. Applications.
TileBrickConstruction of roads
Case study. Conclusion. Reference.
Marble : Most extensively used stone in construction
Marble - crystalline, compact variety of metamorphosed limestone
During processing, 30% of the stone goes to scrap and it produces almost 1 ton of slurry (70% water) from 1 ton of marble
It’s application includes Colour washes, tiles, bricks, gypsum based boards, cellular concrete, masonry cement, portland cement
Rajasthan accounts for almost 95% of the total marble produced in the country and can be considered as the world’s largest marble deposits.
Around 4000 marble mines and 1100 marble processing units spread over 16 districts of Rajasthan.
1.Cutting.2.Grinding3.Polishing
Marble slurry produced equals to 40% of final product.
Marble slurry production: 5.5 lakhs tones /annum in 2004.
At present : 5-6 million tones / annum. This slurry is a great threat to environmental
protection.
Unprocessed marble stones Cutting the marble stone
Slurry produced while grinding
Environmental Impacts of Marble Slurry Deposition
It occupies valuable land. ie. Waste dumped in open lands as big heaps and dumps.Slurry contains:
1. 40% particles< 75µm2. 30% particles< 25µm
This causes serious environmental problems.
When marble slurry dries, fine particles get entrained in atmosphere and it1. Reduces visibility2. Creates respiratory problems
In rainy seasons road surface becomes slippery which is dangerous for the traffic
Due to long term deposition on land,1. Finer particles block the flow regime of aquifers
which affects underground water availability.2. Also contaminates the surface and underground water
reserves. Creates necrotic ecological conditions for flora
and fauna.
In dry season, marble powder flies and deposits on vegetation and crop. It affects environmental and local eco system.
Marble powder deposited in riverbed and surroundings reduces porosity and permeability of soil results water logging
Fine particles result in poor fertility of soil due to increase in alkalinity
Marble slurry being dumped in a vacant plot
Marble slurry deposited in Gomti River, Rajasthan
Cleaning of Gomti River, Rajasthan
Gomti River after cleaning Marble slurry
1.Manufacture of Tiles containing marble Powder.2.Manufacture of Building Blocks using marble powder.3.Utilization of marble powder in the Construction of Roads
Is a manufactured piece of material such as ceramic, stone, metal, glass etc.
Also made from marble, granite, slate, and reformed ceramic slurry, which is cast in a mould and fired.
Effect of marble powder on flexural strength and creep behavior of tiles containing marble powder were tested.
Sample ID No. Mix proportions Water / Cement ratio
Cement Marble powder
S1 1.00 5.00 0.710
S2 1.00 6.00 0.710
S3 1.00 7.00 0.733
S4 1.00 8.00 0.833
72 specimens (18 for each mix) of size 250 mm x 250 mm x 25 mm were prepared.
These specimens were prepared by applying a pressure of 6.25 MPa.
The specimens were left for 24 hours in the air and then cured in water for 28 days. The tiles were tested for their flexural strength and creep.
The results indicate that the flexural strength decreases as the cement content decreases in the mix.
The tiles prepared with mix proportions 1:7 (1 cement: 7 marble powder) satisfied the flexural strength criteria for flooring tiles as per IS: 1237:1980
The tiles prepared with 1:8 (1cement: 8 marble powder) mix proportion failed to satisfy the requirement.
It suggests that the flooring tiles containing approximately 87% marble powder satisfy the flexural strength criteria.
Flexural strength testing apparatus
The mixes which satisfied the flexural strength requirement (specimens S1, S2 and S3) were chosen for creep test.
The specimens which were air dried for 7 days after curing were tested.
Specimen ID No. S1 S2 S3
Wet transverse strength (MPa) 3.700 3.480 3.050
Stress-strength ratio 0.750 0.750 0.750
Time of loading (days) 65 45 81
Instantaneous deflection (mm) 0.145 0.155 0.110
Creep deflection (mm) 0.080 0.055 0.045
Total deflection (mm) 0.225 0.210 0.155
Instantaneous recovery (mm) 0.152 0.142 0.125
Creep recovery (mm) 0.018 0.018 0.005
Residual deformation (mm) 0.055 0.050 0.025
The creep deflections were substantially smaller than the instantaneous deflections.
Magnitude of Instantaneous deflection, creep deflection are very small.
This account for the good performance of tiles under sustained loading.
Eco-blocks to be used in houses building from marble sludge
Result in building blocks of 15 cm with superior properties in terms of water absorption (7%).
compressive strength at 28 days: 195.8 kN or 7.8 N/mm2
15 cm building block
Kuncholi Road, Rajasthan. Soil – MSD mixes were prepared and tested. MSD completely passing through 75µm.
Kuncholi road, Rajasthan
Surfacing: to provide smooth, tough dust free, reasonable waterproof and strong layer.
Base: Medium through which stress imposed are distributed.
Sub base: Additional help in distributing load.
Sub grade: compacted natural earth, also known as formation level.
Engineering properties Soil Soil+
10%
MSD
Soil+
20%
MSD
Soil+
25%
MSD
Soil+
30%
MSD
MSD
Liquid limit, % 29 28.4 27.5 26.5 25.6 25
Plastic limit, % 22.5 21.8 20.8 19.7 18.6 17.8
Plasticity Index, % 6.5 6.6 6.7 6.8 7.0 7.2
Maximum dry density, g/cc 1.9 1.95 1.93 1.92 1.914 1.82
Optimum moisture content, % 11.0 11.6 11.9 12.1 12.1 12.5
CBR ratio,% 12.5 16.5 17.7 15.4 10.2 4.0
Saturated moisture content for
CBR test
13.3 11.5 11.2 11.1 15.6 18.7
Unconfined compressive
strength, kg/cm2
1.3 1.4 1.4 1.5 1.75 -
Use of MSD in sub-grade preparation for a double lane road- save Rs.1,50,000/- per km.
In multi lane roads and for high embankments, savings would increase many folds.
Saves soil and savings on difference in cost of natural soil.
Protection of environment.
Tiles having mix proportion of 1:7 satisfy the flexural strength requirement of flooring tiles.
Production of building blocks :safe for health and environment friendly. Blocks exhibit superior properties
Marble slurry dust finds bulk utilization in roads. 20-30% of soil replaced by MSD
reduces natural resource consumption reduces landfill occupation areas and saves ecosystems
and environment
Gupta, R.C., Misra, A. and Raisinghani, M. (2009), “Flexural Strength and Creep Characteristics of Tiles Containing Marble Powder”, ARPN Journal of Engineering and Applied Sciences, vol. 4, no. 2, pp. 53-57.
Fakher, J.Aukour (2009), “Incorporation of Marble Sludge in Industrial Building Eco-blocks or Cement Bricks Formulation”, Jordan Journal of Civil Engineering, vol. 3, no. 1, pp. 58-65.
Misra, A.K., Renu Mathur, Rao, Y.V., Singh, A.P. and Pankaj Goel (2010), “A New Technology of Marble Slurry Waste Utilisation in Roads”, Journal of Scientific & Industrial Research, vol. 69, pp. 67-72.
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