Introduction
Cement is an essential construction material 1 since it is widely used as a binder in the making of mortar 2. Nevertheless, manufacturing of cement results in discharge of greenhouse gases in the environment 3. According to research conducted by Joseph Davidovit it was elaborated that while producing every ton of cement, about 1 ton of CO2 is released which is an immense amount contributing in 5% of total man-made CO2 emission 4 in which India, emits nearly 7% of the total emissions of carbon dioxide 5. The production of waste is inevitable in the industries 6 but, with the utilization of industrial waste material as a fractional substitution of cement, developing a low carbon footprint system having relatively lesser embodied energy of production is possible 7-9. Addition of substituent materials will help in sustainable and effective construction of the structures by lowering down the waste that is generated 10.
Kota stone is produced after the process of mining when stone sawed is given desired dimension and polish 11. Mining processes generates considerable waste in which the net Kota stone obtained is 30% 12. During the processing in gang saws, the chunks of stone create slurry with the Kota stone solid to produce Kota stone slurry 13. Kota stone is a fine-grained waste having non-slipping surface and amorphous texture so it is also known as flaggy limestone 14.Kota stone is available in many shades making it fit for the commercial and decorative purposes 15. The utilization of Kota stone waste in concrete will significantly reduce the environmental effluence by solving problems associated with the unmanageable disposal of fine slurry powder in the soil 16-17. The consumption of cement will also be reduced 18.
In last two decades the stone sector has increased rapidly with new technologies due to large infrastructural developments 19-20. In India the annual production of stone is very large occupying third position in the world 21 and Rajasthan shares about 50% of its productions. 22. Usage of Kota stone slurry has increased over the few years as it caters to need of sustainable and economic construction 23.Also, sources of sand have started getting exhausted which thereby creates a need of the stone waste to be utilized as a partial replacement of fine aggregate in the manufacturing of concrete 24. When used correctly the stone slurry have an undeniably positive impact on concrete by enhancing the mechanical and durability properties of the mix 25-27.
Impact of Kota stone slurry on the environment and humans
The mismanagement and improper planning of dumping waste produced during mining have led to several environmental issues by disturbing flora and fauna 28. Mining waste when discarded in dry streams are carried by surface runoff 29causing the contamination of water bodies by increasing the amount of total dissolved solids and sulphates 30 When the waste is dumped on land, it has a detrimental impact on the land as it makes the soil infertile 31 and causes an increase in alkalinity 32. Long-term deposition of waste on land causes the blocking of fine slurry particles while drifting water in aquifers 33 thereby, affecting the availability of ground water 34.Agglomeration of the stone slurry also spoils aesthetic appearance of the place where it is been disposed 35-36.Excessive dumping of the mining waste also causes a detrimental impact on the health of people 37-38. Also, from economic point of view, there are heavy operational costs involved in the management and treatment of generated waste which will thereby be reduced by including them in the concrete production 39.
Impact of stone slurry on the properties of concrete
When stone slurry is incorporated in concrete it helps in improving durability by reducing the size as well as volume of pores developed 40-41.Increment in strength was also noted by various researchers 42-43.Chouhan et al. 45 evaluated the performance of substituting sand with Kota stone slurry by conducting various tests. It was concluded that sand could be substituted by Kota stone slurry up to 40% of replacement. Jain et al. 46examined the performance of Kota stone slurry as partial replacement of cement in the ratio of 0% to 25%. Tests were conducted in order to ascertain the mechanical and durability properties of mixes. Results showed that with increment in Kota stone slurry in concrete there was a reduction in compressive and flexural strength but the mixes displayed better resistance to abrasion making them suitable to be used as flooring and pavement material. Al-Akhras et al. 47 analysed that with the enhancement of burnt stone slurry there was an improvement in the strength of mortar but the setting time as well as workability of mortar was reduced.
Almeida et al. 48 utilised stone slurry for replacing fine aggregates in the mixture of concrete. The level of sand substitution selected were 0%, 5%, 10%, 15%, 20%, 34%, 67%, 100%. Results showed that substitution of 5% stone slurry led to higher compressive strength, high modulus of elasticity and greater split tensile strength. Substitution level up to 20% was feasible without influencing the mechanical properties of concrete mixture. Gautam et al. 49 assessed the effect of replacing aggregates in the sub- base course by Kota stone slurry waste. The performance was evaluated by modified proctor test and optimum dry density. Results exhibited that Kota stone slurry could be utilized effectively as it satisfied all the requirements. Rana et al.[50] determined the appropriateness of Kota stone slurry as a replacement of river sand and it was concluded that by substituting sand with Kota stone, the resultant mixture had greater strength with lesser porosity and bleeding.
Omar et al. 51 supported various experiments in to determine the influence of replacing fine aggregates with stone slurry. The proportion of replacement selected were 25%, 50% and 75%. It was concluded that the strength of concrete mix was increased up to replacement level of 50%. Lakhani and Tomar 52 studied the consequence of replacing fine aggregates with the slurry of Kota stone for manufacturing the tiles of floor. Results indicated that stone waste could be replaced up to 25%. Basu et al. 53 assessed the feasibility of including stone slurry in self-compacting concrete. Mixes were prepared with 6 percentages as a fractional replacement of cement. It was observed that increase in the content of stone slurry led to better resistance against freeze and thaw and porosity of the concrete mix got reduced. The results showed that 15% replacement of stone slurry was suitable for concrete applications.
Many researchers have studied the mechanism of corrosion and also the preventions of controlling corrosion 54- 57.Various studies have implied that corrosion in concrete structure was mainly caused due the development of cracks and the rate of corrosion increased with an increase in the width of cracks 58- 61. By the assimilation of stone slurry in the concrete mix, microstructure of the concrete densified 62- 63 thereby, leading to a substantial reduction in the pore size and volume 64.
Li and Kwan 65 described that addition of stone slurry in concrete substantially primed to an increment in the strength of samples and helped in reducing the shrinkage and amount of heat that was generated. Kumar & Prasad 66 also reported that durability of the resultant concrete mix under the activity of HCl and H2SO4 at 5% concentration got improved with the integration of stone slurry. Both mechanical as well as durability properties of concrete were enhanced with the inclusion of stone slurry in concrete according to Dobiszewska 67and Shukla et al. 68 Devi et al. 69 stimated the consistency and compressive strength of the mortar having stone slurry as cement replacement in the ratio of 5%, 7.5% and 10%. Results concluded that the strength and consistency of the paste got increased. Almeida et al. 70 used the slurry of stone in order to investigate its feasibility in concrete of high performance as a substituent of fine aggregates. It was concluded that 16% was the optimum amount of replacement in the concrete mix. Alzboon and Mahasneh 71concluded that slurry sludge up to replacement of 25% obtained successful results in terms of strength and slump. Arif et al. 72 examined the performance of replacing fine and coarse aggregates with the slurry of stone in the ratio of 0%, 5%, 10%, 15%, 20%, 25% and 30%. It was reported that water penetration and risk of sulphate attack got reduced with the increment of stone slurry.
Physical Properties of Kota Stone Powder
Kota stone is predominantly a sedimentary rock which is obtained in various textures and colours. The deposits of stone are stratified and are spilt all along well-formed weak planes which facilitates well textured and smooth homogenous panels of stone of different thickness.
Kota stone is a soft stone having hardness between 3-4 (Mohr’s scale). It has lower porosity and great water-resistant attribute making it an ideal material to be used in the process of constructing concrete structures.
Table 1: Physical characteristics of Kota stone slurry
Authors
|
Water Absorption (%)
|
Colour
|
Specific Gravity
|
Chouhan et al [73]
|
7.23
|
White
|
2.59
|
Khatti et al [74]
|
15.6
|
Dirty Grey
|
2.35
|
Gautam et al [49]
|
23
|
White
|
2.81
|
Chemical Composition of Kota Stone Powder
Amount of by-product generated from the flaggy limestone industries during the processing of stones nearly reaches around 10-12 million tonnes per year. A major portion of flaggy limestone consists of water and nearly 10% of flaggy limestone powder. Thus, after looking at a huge amount of waste generation there is prodigious need of recycling the generated stone waste in order to facilitate sustainable and economic construction of structures.
Table 2: Chemical composition of Kota stone slurry
Authors
|
SiO2 (%)
|
Al2O3 (%)
|
Fe2O3 (%)
|
CaO (%)
|
Chouhan et al [73]
|
23.5
|
3.10
|
1.94
|
37.85
|
Lakhani & Tomar [52]
|
22.69
|
3.26
|
2.72
|
36.32
|
Hiren & Pitroda [75]
|
26.67
|
2.20
|
–
|
38.86
|
Properties of Fresh Concrete
Fresh concrete properties are mainly dependent on the workability as shown below:
Workability
Workability that is property of concrete by virtue of which it has tendency to flow is determined by various tests. Ashish [76]assessed the workability of M25 and M45 grade of concrete by fluctuating the percentage of slurry powder as a replacement of cement in the ratios of 0%, 2.5%, 5%, 7.5%, 10% and 15%. Findings suggested that with the proliferation in content of stone slurry, workability of the mixture got reduced. For M25 grade of concrete, the compaction factor diverged from 0.73 to 0.84 for the two mix proportions as shown in Fig. 1. While, the compaction factor for M45 grade diversified from 0.83 to 0.93 for the proportions as shown in Fig. 2.
Khandelwal et al. 77 also determined the workability of concrete mix prepared with 30% and 40% of cement replacement by blast furnace slag whereas, 10% and 15% of fine aggregate replacement by the slurry of Kota stone. Conclusions revealed that with an increase in blast furnace slag, workability got increased but, contrasting results were observed for Kota stone powder as it reduced the slump value with its increment. The outcomes are shown in Table 3.
Table 3: Variation of slump with blast furnace slag and Kota stone slurry 77
Sr.no.
|
Blast furnace slag
|
Kota stone powder
|
|
|
0%
|
10%
|
15%
|
1.
|
30%
|
66
|
63
|
62
|
2.
|
40%
|
69
|
65
|
64
|
Hardened Properties
The properties of hardened concrete are explained below on the basis of strength and performance under different loads. The main properties of hardened concrete are listed below:
Compressive Strength
It is explained as capacity of concrete structure to endure the cracks and deflection in compression. Strength in compression of the concrete mix incorporating stone slurry was examined by Patel and Pitroda [78] with 10%, 20%, 30%, 40% and 50% replacement levels. Conclusions were made that mix containing 20% substitution had the maximum strength and after 30% replacement the strength reduced eventually as shown in Table 4.
Table 4: Compressive strength test sequel of M25 grade 78
Concrete replacement (%)
|
Compressive strength at 7 days [N/mm2]
|
Compressive strength at 14 days [N/mm2]
|
Compressive strength at 28 days [N/mm2]
|
10%
|
25.48
|
32.89
|
34.67
|
20%
|
26.67
|
33.78
|
35.41
|
30%
|
16.22
|
29.19
|
29.78
|
40%
|
15.85
|
17.78
|
22.07
|
50%
|
11.41
|
16.44
|
16.59
|
Hiren and Pitroda 75 performed investigation for determining the compressive strength variation of concrete mix by the inclusion of stone slurry in the ratio of 0%, 20%, 40%, 60% and 80% as a substitute of grit respectively. It was revealed that compressive strength at 40% replacement level had the maximum strength which was around 7.75% greater than the normal mix. With further increase in the concentration of stone slurry beyond 40% the compressive strength of mix appeared to reduce as depicted in Fig. 3.
Table 5: Compressive strength test sequel of M30 grade 75
Concrete replacement (%)
|
Compressive strength at 7 days [N/mm2]
|
Compressive strength at 14 days [N/mm2]
|
Compressive strength at 28 days [N/mm2]
|
0%
|
6.25
|
8.76
|
14.57
|
20%
|
6.82
|
8.58
|
14.54
|
40%
|
7.34
|
9.35
|
15.7
|
60%
|
6.74
|
9.14
|
15.13
|
80%
|
5.95
|
8.16
|
13.97
|
|
|
|
|
Khodabakhshian et al. 79 performed an experimental study for determining the strength of concrete in compression by incorporating stone slurry. It was concluded that for M25 grade of concrete, the strength got improved up to 7.5% substitution and then after it reduced significantly. Whereas, for M45 the strength increment was up till 10% and after this there was a considerable reduction in strength. Fig. 4 and Fig. 5 represent the results of study.
Chouhan et al. 73 performed a test by using stone slurry as a partial substitution of cement in concrete mix. It was revealed that the samples containing Kota stone slurry exhibited an increment in the strength till 7.5% of substitution and after this level the strength got reduced dramatically as minimum strength was observed at 20% replacement level as shown in Fig. 6.
Split
Tensile Strength
Ability of concrete to withstand tensile stresses that are caused by the
application of load is termed as its tensile strength.
Chouhan et al. 73 deliberated the tensile strength of concrete by adding Kota stone slurry as a partial substitution of cement. Supreme strength of 0.437 MPa was observed at 5% and the lowest of 0.25MPa was observed at 20%. Results of their finding are represented in Fig. 7.
Khodabakhshian et al. 79 carried out studies for determining the tensile strength of M25 and M45 grade of concrete. It was concluded that the tensile strength of the mix was higher than the control mixes up to 10% after this there was a momentous decrease in the strength.
Kumar and Saini 80 inspected the mechanical properties of concrete mix comprising of stone slurry as a replacement of cement in partial amount. Cement was replaced in the proportion of 0%, 25%, 50%, 75% and 100%. Conclusions were made that the strength enhanced till 25% replacement whereas, at 100% replacement the strength became lower than control mix as shown in Fig. 8.
Electrical Resistivity
Ability of concrete to withstand transferring of the ions that are exposed
to electrical field is termed as electrical resistivity.
Singh et al. 25 carried out an investigation under different chemical exposure conditions for determining the electrical resistivity of concrete mix containing river sand been replaced by the stone slurry having substitution level of 25% and 50%. It was discovered that at 25% the electrical resistivity increased by 7.15% whereas at 50% substitution the increase was of 3.98%. Outcomes of their findings are in Table 5.
Table 6: Electrical resistivity test results under different chemical exposure 25
% Replacement
|
Electrical resistivity (kΩ-cm)
|
|
H2O
|
NaCl
|
Na2SO4
|
NaCl+Na2SO4
|
0%
|
125.10
|
127.10
|
129.20
|
128.54
|
25%
|
142.78
|
151.90
|
155.23
|
153.76
|
50%
|
149.98
|
152.99
|
159.56
|
156.43
|
Khodabakhshian et al. 79 experimented to assess the electrical resistivity of stone slurry that incorporated M25 and M45 concrete mix. It was concluded that by increasing the content of stone slurry, the value of electrical resistivity got increased. For M25 grade maximum increase in the percentage of resistivity was 34.72% as shown in Fig. 9 while for M45 the increase was of 31.10% as represented in Fig 10. The reason being, with the inclusion of stone slurry the porosity of the mix increased thereby causing the filling up of pores which resulted in a dense structure.
Water Absorption
It is referred as increase in the weight as a percentage of original weight.Chouhan et al. 73 partially substituted cement with the slurry of Kota stone. It was observed that maximum value of absorption was at 20% substitution level. This was because of the large water absorbing capacity of the slurry of stone. Though up to 10% substitution level slight variations of increment were observed. Fig. 11 depicts the test results.
Kumar and Saini 80 demonstrated an investigational experiment in order to determine durability of concrete mix containing slurry of Kota stone as a fragmentary substitution of fine aggregates in 0%, 25%, 50%, 75% and 100% replacement level. It was concluded that increase in the content of stone slurry, increased the percentage of water absorption with a considerable amount as given in Fig. 12.
Chouhan et al. 81 studied the behaviour of concrete incorporating stone slurry with 0%, 20%, 40% and 60% level of substitution. It was discovered that with an increment in the content of stone slurry, water absorption got increased and it was highest at maximum replacement level of 60% which was about 37.5% more than the normal control mix.
Mehta and Pitroda 82 analysed the effect of replacing marble brick with Kota stone powder in 0%, 20%, 40% 60% and 80% levels of replacement. It was noticed that water absorption decreased progressively after the substitution of 20 % and 40% Kota stone powder, further with an increment in the addition of Kota stone powder the percentage of water absorption increased eventually.
Concluding Remarks
By analysing the researcher’s works on the utilization of Kota stone in concrete production, the following observations could be drawn:
The workability of concrete decreases by increasing the content of Kota stone slurry. The decrease in workability is due to higher surface of particles of stone slurry.
There is an increment in the compressive strength by increasing the percentage of Kota stone slurry till 7.5% after this the strength gradually decreased. Here initial strength increment is because of the filling characteristics of stone slurry but, the reduction is due to loss of the cementitious particles.
Split tensile strength of concrete having Kota stone slurry increases on increasing the percentage of substitution of cement. At 10% replacement, the tensile strength is maximum.
Water absorption of the concrete mix increases by increasing the Kota stone slurry till 20%. The reason being, better water absorption capacity of the stone slurry.
Increase in substitution percentage of Kota stone slurry also led to an increment in the electrical resistivity of the concrete mix because increment of stone slurry, increases the porosity of mix.
With the replacement of constituents of concrete with slurry of Kota stone, the overall construction cost reduces and it also led to an increase in mechanical as well as durability properties of mix.
The biggest problem of waste disposal would be solved by incorporating waste produced in industries for making concrete thereby leading to sustainable construction as these materials like blast furnace slag and Kota stone slurry are already produced and will be discarded very less.
Competing Interests
Authors have detected that no competing interests exist.
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