Ijraset Journal For Research in Applied Science and Engineering Technology
Authors: Er. Shubham Sharma, Dr. Hemant Sood, Sh. Jasvir Singh Rattan
DOI Link: https://doi.org/10.22214/ijraset.2023.55797
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Self-curing concrete, a specialized solution, eliminates external curing for optimal performance in construction. It maintains internal moisture, reducing autogenous shrinkage and early-stage cracking. This innovative approach, promoting sustainable practices, is valuable for high-rise buildings and bridges. Self-Curing properties achieved in concrete through the incorporation of Sodium Polyacrylate and Formaldehyde. Extensive testing was conducted on diverse concrete samples to evaluate their properties, encompassing workability, compressive strength, tensile strength, and flexural strength. Sodium polyacrylate which is a super absorbent polymer is added to the concrete mix of M20 & M25 grade of concrete in variations (0%, 0.2%, 0.4%, 0.6%, 0.8%, 1.0%) by weight of cement. Formaldehyde added to concrete mix used as shrinkage reducing agent is added 1% with water. Light weight aggregate like brick chips replaced 10% of coarse aggregate are used because bricks absorb and holds a large amount so water. So pre-saturated brick chips are also used to provide internal curing. Sand is replaced by wood powder by 5%, as it also absorbs water. The compressive strength tests were carried out on M20 and M25 grade concretes with different water-cement ratios (for M20 w/c ratio is 0.50 & for M25 w/c ratio is 0.40), adhering to BIS: 516 – 1959 standards. The results indicated that the addition of sodium polyacrylate by weight of cement up to 0.6% led to optimal compressive strength values, beyond which further additions resulted in a decline in strength. Similarly, the split tensile strength tests for M20 and M25 grade concretes showcased the highest values at 0.6% addition of sodium polyacrylate by weight of cement. Subsequent increases in the additive led to a decrease in split tensile strength. Finally, the flexural strength tests for both M20 and M25 grade concretes yielded their highest values at 0.6% sodium polyacrylate by weight of cement, with diminishing flexural strength observed with higher additive percentages. These findings offer valuable insights into enhancing the self-curing properties of concrete and optimizing its characteristics by utilizing sodium polyacrylate as an additive.
I. INTRODUCTION
Self-curing is a process in which cement undergoes hydration with the assistance of additional internal water that is distinct from the mixing water. The conventional understanding of concrete curing involves creating conditions that prevent water from evaporating from the surface, essentially curing "from the outside to the inside." On the other hand, internal curing facilitates curing "from the inside to the outside" by utilizing internal reservoirs that have been incorporated into the concrete mixture. These reservoirs are formed with the help of superabsorbent polymers like sodium polyacrylate, saturated wood powder, or lightweight fine aggregates & lightweight coarse aggregate like brick chips. Another term commonly used interchangeably with "Self-Curing" is "Internal-Curing."
II. EXPERIMENTAL MATERIALS
A. Sodium Polyacrylate (SPA)
The use of sodium polyacrylate as a super absorbent polymer in concrete holds up its potential of improving a variety of concrete qualities, including concrete strength.
Properties: -
The addition of SPA to the concrete mix leads to several benefits: -
B. Shrinkage Reducing Admixture (FORMALDEHYDE)
When shrinkage-reducing admixtures are introduced during batching, both short- and long-term shrinkage can be greatly reduced. This is realized by addressing the underlying issue that's causing the cement paste's pores and capillaries to shrink as it dries. The specified amount of formaldehyde is added to the water during batching process to reduce shrinkage in concrete.
C. Saturated Light Weight Aggregate
When referring to a set of aggregates with a relative density lower than standard density aggregates (natural sand, gravel, and crushed stone), light weight aggregate is also known as low density aggregate. In M20 and M25 concrete, specified amount of coarse particles are substituted for light weight aggregate (brick-chips).
D. Saturated Wood Powder
A byproduct of furniture and timber manufacturers is wood powder. Also have high water absorption properties which can be used to provide internal water to concrete during the hydration process. A specified amount of fine aggregate is replaced by saturated wood powder. Wood powder is light weight & has the properties to hold water for a long period of time which makes it useful for self-curing.
E. Cement
Portland pozzolana cement (Fly ash based) of Ultratech, conforming to IS: 1489-1, was the cement used in the experimentation.
III. DESIGN MIX
The mix proportion of M20 & M25 grade of concrete by using Sodium Poly-Acrylate & Formaldehyde is given in Table 5 and Table 6 respectively. The design mix of M20 & M25 grade of concrete by using Sodium Poly-Acrylate & Formaldehyde is shown in Table 7 and Table 8 respectively. The Design mix prepared by IS: 10262-2019.
1) The strength of concrete increased linearly with the increase in addition of sodium poly-acrylate up to 0.6% by weight of cement. On further addition of sodium poly-acrylate the strength starts to decrease. 2) Workability of concrete increases gradually with the addition sodium poly-acrylate due to their large capacity to store water inside it. 3) Self-Curing Concrete shows nearly same strength when compared to the conventional concrete in results that had been drawn from testing. 4) Self-curing concrete is indeed a valuable alternative in regions where water scarcity is a significant concern. Traditional concrete curing methods often involve a substantial amount of water, which can be impractical and environmentally unsustainable in arid or water-scarce areas. Self-curing concrete offers a solution to this problem by reducing the need for external curing and relying on internal mechanisms to maintain adequate moisture levels for proper hydration of the cement. 5) The optimum dosage of sodium poly-acrylate for maximum strength (compressive strength, tensile strength and flexural strength) was found to be 0.6% for the M20 & M25 (with 10% brick-chips replacing coarse aggregate, 5% wood powder replacing fine aggregate, 1% formaldehyde addition to water and 0.6% sodium poly-acrylate added by weight of cement).
[1] M. R. Navaneethan, “SELF CURING CONCRETE SUPERVISOR,” 2017. [2] M. Ahmed, S. Alqadhi, S. Alsulamy, S. Islam, R. A. Khan, and M. Danish, “Development of self-cured sustainable concrete using local water-entrainment aggregates of vesicular basalt,” Sustainability (Switzerland), vol. 13, no. 12, Jun. 2021, doi: 10.3390/su13126756. [3] P. Manishkumar Dahyabhai and J. R. Pitroda, “Introducing the Self-Curing Concrete in Construction Industry.” [Online]. Available: www.ijert.org [4] M. I. Mousa, M. G. Mahdy, A. H. Abdel-Reheem, and A. Z. Yehia, “Self-curing concrete types; Water retention and durability,” Alexandria Engineering Journal, vol. 54, no. 3, pp. 565–575, Sep. 2015, doi: 10.1016/j.aej.2015.03.027. [5] D. O. Nduka, J. O. Ameh, O. Joshua, and R. Ojelabi, “Awareness and benefits of self-curing concrete in construction projects: Builders and civil engineers perceptions,” Buildings, vol. 8, no. 8, Aug. 2018, doi: 10.3390/buildings8080109. [6] M. kumarR, “Preliminary Studies Of Self Curing Concrete With The Addition Of Polyethylene Glycol 1-Assistant Professor, Department of Civil engineering.” [Online]. Available: www.ijert.org [7] M. J. Siddiqui, “Self-Curing Concrete with Shrinkage Reducing Admixture,” 2015. [Online]. Available: https://www.researchgate.net/publication/304855026 [8] S. Tyagi, “‘Comparison of Strength Characteristics of Self Cured Concrete,’” International Research Journal of Engineering and Technology, 2015, [Online]. Available: www.irjet.net [9] D. J. Sr AsstProfessor, “Compressive Strength and Durability of Self Curing Concrete,” International Research Journal of Engineering and Technology, 2016, [Online]. Available: www.irjet.net [10] M. Manoj Kumar and D. Maruthachalam, “Experimental Investigation on Self-curing Concrete,” International Journal of Advanced Scientific and Technical Research Issue, vol. 3. [11] P. P V, M. J. K, M. K. v S, and P. B. R, “Experimental Study On Self-Curing Concrete Using LECA And Sodium Acrylate,” International Journal of Civil Engineering, vol. 8, no. 4, pp. 1–4, Apr. 2021, doi: 10.14445/23488352/ijce-v8i4p101. [12] S. Satapathy, N. Patel, and P. G. Scholar, “An Experimental Investigation of Self Curing Concrete,” 2021, [Online]. Available: www.ijsdr.org [13] A. Viswam and A. Murali, “REVIEW ON THE STUDY OF SELF CURING CONCRETE,” 2018. [Online]. Available: www.ijariie.com [14] T. A. Sajana Khader and T. S. Shabana, “Engineering and Technology (A High Impact Factor,” International Journal of Innovative Research in Science, vol. 7, 2018, doi: 10.15680/IJIRSET.2018.0703105. [15] D. Allam, S. Rama Rao, B. Manideep, V. Hemanth, and Jl. Sudha, “Issue 4 www.jetir.org (ISSN-2349-5162) JETIRBG06008 Journal of Emerging Technologies and Innovative Research (JETIR) www.jetir,” 2019. [Online]. Available: www.jetir.org [16] V. Dixit, V. Viswakarma, and R. Chandak, “Study of self-curing concrete with LWPA: A Review,” 2020. [Online]. Available: www.ijrti.org [17] P. Manishkumar Dahyabhai and J. R. Pitroda, “Introducing the Self-Curing Concrete in Construction Industry.” [Online]. Available: www.ijert.org [18] G. Sudharson, M. Kalpana, D. Anburaja, and M. G. Prathap, “PEG 400 Effect on Properties of Self Curing Concrete,” IOP Conf Ser Mater Sci Eng, vol. 1026, no. 1, p. 012014, Jan. 2021, doi: 10.1088/1757-899x/1026/1/012014. [19] M. Abid, “A Literature Review on Experimental Studies on Properties of Self-Curing Concrete using Poly-Ethylene Glycol-400,” Int J Res Appl Sci Eng Technol, vol. 6, no. 5, pp. 1827–1830, May 2018, doi: 10.22214/ijraset.2018.5298. [20] Indirajith AJ and Vishnua, “Online) Available online at www,” 2016. [Online]. Available: www.ijartet.com [21] Bureau of Indian Standards Specification for Portland Pozzolana Cement (PPC), IS 1489-1 [22] Bureau of Indian Standards Specification for Methods of test for Aggregates for Concrete, BIS: 2386 – 2016. [23] Bureau of Indian Standards Specification for Specification for Coarse and Fine Aggregates from Natural sources for Concrete, BIS: 383 – 1970. [24] Bureau of Indian Standards Specification for Plain and Reinforced Concrete – Code of Practice, BIS: 456 – 2021. [25] Bureau of Indian Standards Specification for Plain and Reinforced Concrete – Code of Practice, BIS: 456 – 2000. [26] Bureau of Indian Standards Methods of Sampling, Testing and Analysis for fresh Self Compacting Concrete, BIS: 1199 (Part 6) – 2018. [27] Bureau of Indian Standards Method of Tests for Strength of Concrete, BIS: 516 – 1959. [28] Bureau of Indian Standards Guidelines for Concrete Mix Proportioning, BIS: 10262 – 2019.
Copyright © 2023 Er. Shubham Sharma, Dr. Hemant Sood, Sh. Jasvir Singh Rattan. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Paper Id : IJRASET55797
Publish Date : 2023-09-20
ISSN : 2321-9653
Publisher Name : IJRASET
DOI Link : Click Here