View of IMPACT OF RICE HUSK ASH IN CONCRETE MIX DESIGN

(1)

Peer Reviewed and Refereed Journal

VOLUME: 07, Issue 07, Paper id-IJIERM-VII-VII, September 2020

⁶ IMPACT OF RICE HUSK ASH IN CONCRETE MIX DESIGN

1Vivek Singh Thakur, ²Prof. Anil Sanodiya, ³Prof. Charan Singh Thakur Department of Civil Engineering, SRGI, Jabalpur,

Madhya Pradesh, India

Abstract:- In this paper an attempt has been made to show the impact of Rice husk ash as a partial replacement of cement on concrete structures by performing an experimental study in the laboratory to improve the compressive strength of concrete structures.

Compressive strength of concrete cubes by mixing rice husk ash tested at 7, 14 and 28 days for M-20, M-25 and M-30 grade has been found to be Superior as compare to without Admixture. Rice husk ash as a partial replacement of cement is added in the concrete mix design and a detailed parametric study for 10%, 20% and 30%. The results shows that compressive strength of concrete cubes has been improved by adding Rice husk (as a partial replacement of cement) in the concrete Mix design.

1. INTRODUCTION

Concrete is a composite man-made material mostly used as building binding material in construction era. Now-a-days concrete is used with advanced and improved technologies such as R.C.C.

structures or F.R.C. structures to give extra ordinary strength and durability to the structures against sliding, cracking, buckling, overturning etc. Now-a-days in the field of Civil Engineering era a lot of work has been done related to the experimental study of compressive strength of concrete cubes in which only cement, sand, aggregates and water are used in the form of water-cement ratios with different grade of concrete with steel fiber concrete and silica fume and without Admixture.

But they did not use Super plasticizers as an Admixture. Admixture are the materials other than the three basic ingredients of cement-concrete- cement, aggregate and water added to the concrete mix before or during mixing to improve certain properties like setting time, workability, dispersion etc. To modify the mechanical properties Super plasticizer in the form of Admixture is used in this study. Construction industry is one of the fastest growing sectors in India.

Rapid construction activity and growing demand of houses has lead to the short fall of traditional building materials like bricks, cement, sand and wood.

Demand of good quality of building materials to replace the traditional materials and the need for cost effective and durable materials for low cost housing has necessitated the researchers

to develop variety of new and innovative building materials. Rice milling generates a byproduct known as husk and this husk is converted in to ash is known as rice husk ash.

According to the food and agricultural organization (1976), the worlds annual productivity of paddy is around 300 million tonnes. From this amount around 60 million tonnes of husks are produced. If undisposed of the husk will occupy of 600 million cubic metres of storage space. Due to their pozzolonaic character, low nutrition value, and high ash content majority of the percentage of husk is transpoted to field for disposal, usually for open field burning.

In India it is basically used in:- 1. Insecticide powders.

2. Ceramic applications (porosity control).

3. Sludge dewatering treatment.

4. Insulating /re-factory application.

In recent years, research work has been carried out in many countries including India have led to a result that rice husk if burnt properly can turn into a reactive ash which can be used as a partial replacement for cement for making concrete. This is because as high as 85%

to 95% of the ash by weight is silica (sio2) and most of it is reactive depending upon the burning process.

2. LITERATURE REVIEW

This paper deals with the effects and impacts of Admixture and Rice-husk on compressive strength of concrete cubes of M-20 grades and also makes a

(2)

VOLUME: 07, Issue 07, Paper id-IJIERM-VII-VII, September 2020

⁷ comparative study for compressive

strength of cubes with and without admixture and similarly with and without Rice husk ash by doing parametric analysis. Various research work have been carried out in the various parts of the world regarding RHA.

Conclusions of some of them are as follows:-

1. In 1982, yomamoto and lakho, studied the effect of the presence of carbon in RHA. He concluded that content of carbon can be minimized by further burning and grinding it into more finer form.

This process further improved the various properties of ash. They also told that rapid cooling also helps in improving the quality of RHA.

2. In feb 2014, Dr. Subha khatri carried out a research on the impact of RHA on partial replacement with cement in making concrete produced in the surrounding regions and concluded that RHA has shown superior results on various paramenters of concrete. The variation of cubic strength ranges

from 30% to 50% on above side depending upon various grades of concrete.

3. Mehta and pirtz made a considerable contribution regarding RHA. They developed a process of converting rice husk into energy and various valuable industrial products. It was shown by them that with 30%

replacement of OPC by RHA the temperature of concrete can be considerably brought down up to 20%. This may make use of concrete economical in two ways.

Firstly, cooling cost of concrete can be reduced or eliminated and secondly, cement content can be reduced both of which could lead to considerably bringing down the cost of concrete.

4. We in 1981 concluded that the compressive strength was reduced when it was mixed in a large proportion of the partial replacement of cement in lean mixes. But in heavy grades such as m20 m25 m30 it is found to be increasing with some definite cement water ratio.

3. OBSERVATIONAL - ARRANGEMENT

Table 1 No. of cubes made for laboratory experiment are as follows:

Grade Partial replacement of cement Sample size (no. of cube)

M20 10% 9

M20 20% 9

M20 30% 9

M25 10% 9

M25 20% 9

M25 30% 9

M30 10% 9

M30 20% 9

M30 30% 9

Compressive strength of different grades of concrete at 7 and 28 days

Grade of Concrete

Minimum compressive strength N/mm2 at 7 days

Specified characteristic compressive strength

(N/mm2) at 28 days

M15 10 15

M20 13.5 20

M25 17 25

M30 20 30

M35 23.5 35

M40 27 40

(3)

VOLUME: 07, Issue 07, Paper id-IJIERM-VII-VII, September 2020

⁸

M45 30 45

Table 2 Actual Reading of Cube in CTM Machine Grade Partial

replacement of cement

7 Days

(in N/mm2) 14 Days

(in N/mm2) 28 Days (in N/mm2) M20 10% 22.22, 23.44, 21 23.33, 22, 22.66 33.33, 31.66, 33 M20 20% 25, 22.9, 22.55 26, 25.65,22 32, 30.66, 29.33 M20 30% 14.33, 13, 33.33 7.5, 8, 8.55 8.66, 7.66, 9 M25 10% 21, 23.11, 22.66 22.67, 24, 24 28.9, 29.7, 28.4 M25 20% 21.33, 22, 26 26.66, 25.77, 24 30.66, 29.33, 30.22

M25 30% 7.11, 7, 7.22 9, 8.66, 9 12, 11.66, 11

M30 10% 26.66, 25.77,

27.11 28.44, 29.77,

30.22 33.33, 32.9, 35.55

M30 20% 26.22, 24.88,

27.55 30.22, 29.77,

30.22 34.66, 36.44, 37.33 M30 30% 10.55, 11, 10.44 11.77, 11.33,

11.55 13.11, 13.77, 13 Table 3 The table below gives the final tally of the compressive strength of cubes as

tested in the laboratory for M-20, M-25 and M-30 grade of concrete Grade of

concrete

% of RHA Comp.

Strength in 7 days

Comp.

M-20 10% 22.00 22.6 32.00

20% 23.55 25.55 30.66

30% 13.55 7.55 8.00

M-25 10% 22.25 23.55 29.01

20% 23.11 25.47 30.07

30% 6.66 7.66 12.54

M-30 10% 23.11 25.47 30.07

20% 26.21 30.07 36.14

30% 9.00 10.66 11.33

(4)

VOLUME: 07, Issue 07, Paper id-IJIERM-VII-VII, September 2020

⁹

(5)

VOLUME: 07, Issue 07, Paper id-IJIERM-VII-VII, September 2020

¹⁰ 4. RESULTS AND DISCUSSION OF

COMPRESSIVE STRENGTH

In the present study, a simplified experimental study has been proposed and carried out for showing the impact of Rice husk ash in concrete structure. The response of study has been presented in the form of compressive strength of cubes at 7,14 and 28 days. A comparison study has been carried out at M-20, M-25 and M-30 grades of concrete with and without RHA.

Based on this, the following generalized conclusions can be drawn:-

1. Any variation in cubic strength of concrete cubes with and without admixture has been found to be significantly influenced with respect to number of days. It increases about 40% at 7days 30%

at 14 days and 50% at 28 days by inclusion of 10% RHA as an Admixture (partial replacement with cement) as compared to

(6)

VOLUME: 07, Issue 07, Paper id-IJIERM-VII-VII, September 2020

¹¹ without Admixture for M-20 grade

of concrete.

2. An increment of about 65%, 55%

and 50% at 7,14 and 28 days has been observed respectively with 20% RHA as compared to without RHA for M-20 grade of concrete.

3. The compressive strength of concrete cubes has been found to be decreasing with 30% RHA as compared to without RHA for M-20 grade of concrete.

4. Similarly A comparison study has also been carried out to show the change in the compressive strength for M-25 and M-30 grade of concrete and the result thus obtained are shown in the above tables.

Hence, we conclude that the pozzolonaic property of RHA is very productive for economical and efficient concrete since it reuce the cost of concrete along with

producing superior strength as compared to the conventional concrete.

REFERENCES

1. M.L. Gambhir, Concrete technology, fifth edition.

2. Nelson Semaan, Mix design of rice husk ash concrete: an Australian University of Wollongong, 1986.Research online University of Wollongong Thesis Collection.

3. 1.Padma Rao, 2.Pradhan Kumar, 3.Bhaskar Singh, A Study on Use of Rice Husk Ash in Concrete. IJEAR Vol. issue spl 2 Dept. of Civil Engineering, Vignan University, Vadlamudi, Guntur, AP, India.

4. John Newman, Advance Concrete Technology, edition 2003.

5. IS code 1026-2009, IS code for mix design of concrete.

6. IS code 10262:2009, IS code for concrete mix proportioning.

7. Dr. Subha khatri ,Impact of admixture &

rice husk ash in concrete mix design IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-ISSN: 227g- 1684,p-ISSN: 2320-334X, Volume 11, Issue 1 Ver. IV (Feb. 2014), PP 13-17.