View of STUDY THE PERFORMANCE EFFECT ON RC BEAMS BY USING FLY ASH AND SCC IN CONCRETE

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ACCENT JOURNAL OF ECONOMICS ECOLOGY & ENGINEERING

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Vol. 06, Issue 07,July 2021 IMPACT FACTOR: 7.98 (INTERNATIONAL JOURNAL) 25 STUDY THE PERFORMANCE EFFECT ON RC BEAMS BY USING FLY ASH AND SCC IN

CONCRETE

Triloki Nath Choubey¹, Amit Richariya²

1Research Scholar, Dept. of Civil Engineering, SVN University, Sagar (M.P)

2Assistant Professor, Dept. of Civil Engineering, SVN University, Sagar (M.P)

Abstract- In this paper we explores the effect of fly ash, recycled aggregate concrete (RAC), ultra-high strength concrete (UHSC) and self-compacting concrete (SCC) on the performance of reinforced concrete beams. The nonlinear finite element analysis using ANSYS software program was employed to model RC beams. A smeared crack approach was used for the concrete in all finite element models. The compressive and tensile strengths, modulus of elasticity, and poissons ratio for various cementitious materials required in the finite element analysis modeling were collected from the literature. The first validated RC beam was investigated for flexural response of concrete beams made with mixtures of 25% fly ash, ultra-high strength concrete, 50 and 100% recycled concrete aggregates, and normal strength self-compacting concrete. For the second validated high strength SCC beam, the effects of silica nano powder and silica fumes were also studied.

1 INTRODUCTION

Despite advances in technology and construction techniques for building structures the use of cement-based materials is believed to improve the sustainability of concrete mixtures. In general, the concrete material is a mixture of cement, and, water and aggregates. However, if the concrete materials used in this construction practices are not controlled, it would result in impacting the environment negatively and less durable building structures. Our major concern is about the negative global warming, reduction in amount of water usage and workability.

In recent years, different cement-like materials, such as concrete with fly ash, recycled concrete aggregates, ultra-high strength concrete and self-compacting concrete with different binder contents having silica and nano silica fumes, have gained significant importance due to their advantages in reducing negative impact on the environment, as well as their availability and mechanical properties.

In the following sections different types and characteristics of these cementitious materials are described.

2 CONSTRUCTION MATERIAL TYPES AND CHARACTERISTICS

2.1 Fly Ash

Fly ash is a by-product of coal power stations generated by combustion of coal.

It is mainly a mixture of oxides of calcium, iron, silica, alumina, magnesium and many other substances.

They are in a phase of glassy nature due to their production in higher temperatures. In the USA fly ash is usually produced in coal-fired power plants, but nowadays about 43% of fly ash has been recycled and used in the production of concrete with partial replacement of portland cement.

2.2 Ultra-high Strength Concrete For the benefits of the construction industry, there have been many materials developed. In this process, ultra-high strength concrete (UHSC), also known as reactive powder concrete which is composed of composite materials having higher compressive strengths, has been developed in the early 1990s. UHSC comprises of very fine powders of cement materials and super plasticizer.

2.3 Recycled Concrete Aggregates The use of recycled concrete aggregates in concrete structures has become a com- mon practice for many years. In the U.S.A alone 140 million tons of concrete are recycled each year (ReCrete Materials, Inc., 2008).

2.4 Self Compacting Concrete

The concept of self-compacting concrete is to produce concrete without the need for full compaction as proposed by professor Okamura (2003). The SCC materials have the capability of being placed anywhere without segregation, uniformity in struc-tural outline, proper filling, bond strength improvement and

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ACCENT JOURNAL OF ECONOMICS ECOLOGY & ENGINEERING

Vol. 06, Issue 07,July 2021 IMPACT FACTOR: 7.98 (INTERNATIONAL JOURNAL) 26 faster constructability.

Figure 1: Time-dependent phase development in OC and UHPC (Korpa et

al. (2009))

3 RESULTS OF FEA SCC BEAM WITH DIFFERENT ADMIXTURES

To ensure accuracy of results, FEA analysis of the high strength self- compacting concrete (SCC) beam was compared with the experiment model in previously published research. The concrete crushing and steel yieldings were plotted in these simulations using the ultimate strain, of concrete and steel, material values according to ACI 318-11.

Figure 2: Deflection plots for experimental SCC and FEA SCC

Figure 3: Mid-span Load deflection plot for FEA control beam and SCC450

Figure 3: Mid-span Load deflection plot for FEA control beam and

SCC450NS2%

4 CONCLUSIONS

Finally, the results of FEA models of RC beams using various cementitious materials and, high strength SCC beams with nano silica and silica fumes were compared to control beams. The following conclusions can be drawn:

1. The results of generated finite element analysis models of normal and high strengths RC beams were in good agreement with experimental results of two beams in the existing literature.

2. All the beams using various cementitious materials were having a similar value of cracking loads and shear strengths compared to the normal strength concrete beam.

The high strength concrete showed 100% higher first cracking load as compared to the normal strength RC beam.

3. The beam, with concrete mixtures of 25% fly ash and 50 and 100%

recycled concrete aggregates, and normal strength self-compacting concrete could provide similar ultimate load and displacement capacities as the control beam.

REFERENCES

1. ACI Committee 318. ACI Standard Building Code Requirements for Reinforced Concrete (ACI 318-14). ACI standard 318-14. American Concrete Institute.

2. Mahdi Arezoumandi et al. “An experimental study on flexural strength of reinforced concrete beams with 100% recycled concrete aggregate”. In: Engineering Structures 88 (2015), pp. 154–162.

3. Sergiu Baetu and Ioan-PetruCiongradi.

“Nonlinear finite element analysis of reinforced concrete slit walls with ANSYS (I)”. In: Buletinul Institutului Po- litehnic din lasi. Sectia Constructii, Arhitectura 57.1 (2011), p. 31.

(3)

ACCENT JOURNAL OF ECONOMICS ECOLOGY & ENGINEERING

Vol. 06, Issue 07,July 2021 IMPACT FACTOR: 7.98 (INTERNATIONAL JOURNAL) 27 4. MYH Bangash. Concrete and concrete

structures: Numerical modelling and ap- plications. 1989.

5. Antonio Barbosa, S Idelsohn, and E Dvorkin.

Analysis of reinforced concrete structures using ANSYS nonlinear concrete model.

Citeseer, 1998.

6. Evan C Bentz. “Sectional analysis of reinforced concrete members”. PhD thesis.

University of Toronto, 2000.

7. Alberto Carpinteri, Mauro Corrado, and Marco Paggi. “An integrated cohe- sive/overlapping crack model for the analysis of flexural cracking and crushing in RC beams”. In: International journal of fracture 161.2 (2010), pp. 161–173.

8. Cement and CED 2 Concrete Sectional Committee. Indian Standard Plain and reinforced concrete–code of practice (IS 456:

2000). Bureau of Indian Standards.

9. Ali Chahrour and Khaled Soudki. “Flexural response of reinforced concrete beams strengthened with end-anchored partially bonded carbon fiber-reinforced polymer strips”. In: Journal of Composites for Construction 9.2 (2005), pp. 170-177.

10. Wai-Fah Chen et al. “Constitutive models”.

In: Finite Element Analysis of Reinforced Concrete Structures II (1993), pp. 36 117.

11. S Collepardi et al. “Mechanical properties of modified reactive powder concrete”. In: ACI Special Publications 173 (1997), pp. 1–22.

12. Mauro Corrado, Erica Cadamuro, and Alberto Carpinteri. “Dimensional analysis approach to study snap back-to-softening-to-ductile transitions in lightly reinforced quasi-brittle materials”. In: International journal of fracture 172.1 (2011), pp. 53–63.

13. M Newtson Craig and Allena Srinivas.

“Materials Specification Needs for Fu- ture Development of Ultra High Performance Concrete”. In: Advances in Civil Engineering Materials 4.2 (2014), pp. 17–37.

14. L Dahmani, A Khennane, and S Kaci. “Crack identification in reinforced concrete beams using ANSYS software”. In: Strength of materials 42.2 (2010), pp. 232–240.

15. Richard Day. “ENVIRONMENTAL TOPICS- Technical Report 62 Self-compacting concrete–A review”. In: Concrete-Crowthorne 39.6 (2005), pp. 10–11.

16. Prakash Desayi and S Krishnan. “Equation for the stress-strain curve of concrete”. In:

Journal of the American Concrete Institute 61.3 (1964), pp. 345–350.

17. VS Dorofeev et al. “Modeling of the stress- deformed state and cracking in- reinforced concrete structures using ANSYS Mechanical”. In: Technical Sci- ences/

University of Warmia and Mazury in Olsztyn (2014).

18. P Fanning. “Nonlinear models of reinforced and post-tensioned concrete beams”. In:

Electronic Journal of Structural Engineering 1 (2001), pp. 111–119.

19. Xiuping Feng and Boyd Clark. “Evaluation of the physical and chemical properties of fly ash products for use in Portland cement concrete”. In: 2011 World of Coal Ash Conference, Denver, Colorado. May 2011.

20. Zoran Grdić, Iva Despotović, and GordanaTopliˇcić-C´ urˇcić. “Properties of self- compacting concrete with different types

of additives”. In: Facta universitatis- series:

Architecture and Civil Engineering 6.2 (2008), pp. 173–177.

21. WI Hamad, JS Owen, and MFM Hussein.

“Modelling the degradation of vibra- tion characteristics of reinforced concrete beams due to flexural damage”. In: Structural Control and Health Monitoring 22.6 (2015), pp. 939–967.

22. WI Hamad, JS Owen, and MFM Hussein.

“Modelling the nonlinear behaviour of a cracked reinforced concrete beam”. In:

Procedings of the International Con- ference Computing in Civil and Building Engineering.

Vol. 30. 2010.

23. Roszilah Hamid, ASMZ Hasan, and AK Ariffin.

“Sensitivity of model parameter on dynamic behavior simulation of HPC”. In: Journal of Materials in Civil Engineering 22.12 (2010), pp. 1244–1251.

24. Kh M Heiza, NN Meleka, and NY Elwkad.

“Behavior and analysis of self- consolidated reinforced concrete deep beams strengthened in shear”. In: ISRN Civil Engineering 2012 (2012).

25. Barry Peter Hughes. Limit state theory for reinforced concrete design. Mono- graph.

1976.

26. Haider M Abdul Hussein and Ahmed N Mohammed In. “Nonlinear finite element analysis of concrete filled steel tubes”. In:

Journal of Babylon Univer- sity/ Engineering Sciences N (2013).