Rheological and Mechanical Properties of Standard Concrete by using locally available Calcareous and Siliceous Material

Abstract

The investigates is basically on the Rheological and Mechanical properties of standard concrete by using Locally available Calcareous and Siliceous material and a comparative study is done for the rheological parameter for mixes with or without using superplasticizer. For rheological parameter, various mixes with water cement ratio of 0.45 and slump value of 120 mm were prepared for the experiment by replacing different percent as (0%,5%,10%,15%) of locally available material such as Metakaolin and tested with German based instrument ICAR Rheometer. Test on Rheometer is done to study flow property of concrete so that concrete mixes can be pumped to high rise building properly. As per the finding, as the metakaolin percentage were increased the static yield and dynamic yield stress decreases this indicate that it is easy to pump at higher blending. For mechanical properties, mixes were prepared and test Performed is compressive strength test. The findings of this experiment have important implication for construction industry basically in the high-rise structure.

Introduction

I. INTRODUCTION

Concrete is the most important component of any structure and is the most widely utilized material in the construction industry. A number of factors influence concrete selection, including environmental impact, energy usage, budget, and technical features. As a result, concrete technology has advanced in the production of alternative building materials that can match these specifications while remaining locally available, cutting construction costs. Standard concrete is a stronger concrete than common concrete. Its strength is achieved by using supplementary cementitious materials (SCMs) that is metakaolin, rice husk ash, fly ash, silica fume, granulated blast furnace slag etc. This material became popular in the construction industry because of its ability to enhance the mechanical and rheological properties of concrete.

A. Rheology of Concrete                           

Rheology is defined as the study of the behaviour of fluid flow and its deformation. In this case, material is taken as freshly prepared concrete. Study of rheology is important for understanding and managing concrete qualities like as workability, stability and ease of placement. Concrete's rheological properties affect everything from mixing, handling and transportation to the performance of structures. Our country is developing, so the consumption of concrete is increasing. Currently, high-rise structures or skyscrapers are preferred over low-rise buildings. To transport concrete from one place to another we need to modify properties of concrete as to make it pumpable and after pumping it can be workable.

1. The Bingham Model: The Bingham model is often used to represent concrete flow behaviour due to its simplicity and ability to represent the majority of concrete mixtures.

II. METHODOLOGY

A. Materials Properties

In the present experimental investigation, Portland slag cement (PSC) corresponding to Bureau of Indian Standard (BIS) IS:455:2015 [1]is used. The other cementitious materials included GGBS and AF was used in the densified form in this research. The GGBS  and AF sample satisfied the requirements of IS 15388-2003 [2] and IS 12089–1987 [3]. W/b ratio is taken as 045 for all mixes. As fine aggregate, common riverbed sand with a Fineness modulus of 2.60 was used. Specific gravity and water absorption were found to be 1.0% and 2.63, respectively. As coarse aggregate 20 mm-sized crushed Pakur stone that was readily available locally was used.

Specific gravity and Water absorption were found to be 0.78% and 2.74, respectively. Polycarboxylic ether-based water-reducing superplasticizer fosroc auramix 200  [4], [5]was used in preparing concrete mixes. Particle size distribution curve for coarse and fine aggregate is shown in Figure 1.

Conclusion

1) After comparing rheology of mix prepared with HRWRA gives better result than mix which are not prepared with HRWRA. 2) It is seen that as blending percentage of metakaolin increases, early gain of strength increases i.e. strength at 3 days and 7 days. 3) It is seen that compressive strength at 28 days decreases as the percentage of metakaolin increases. 4) It is seen that if there is an increase of Metakaolin (%) from 0% to 15% then there is decrease in both the yield stress and plastic viscosity. 5) For the blending greater than 15%, compressive strength decreases below target strength. It is recommended to blend metakaolin up to 15%. 6) Compressive strength at 3 days is approximately 65% of 28 days strength. 7) As the percentage of metakaolin increases, pumping force decreases. 8) After detailed analysis of rheological and physical strength parameter, it is seen that mix with 15% of metakaolin is best choice Conflict of Interest: The author declares that they have no conflict of interest

References

[1] R. K. Majhi and A. N. Nayak, “Properties of concrete incorporating coal fly ash and coal bottom ash,” J. Inst. Eng. Ser. A, vol. 100, no. 3, pp. 459–469, 2019. [2] S:15388-2003, “I Specification for Silica Fume.,” Bur. Indian Stand. New Delhi, India, pp. 1–13, 2003. [3] IS:12089-1987, “Specification for granulated slag for the manufacture of Portland slag cement,” Bur. Indian Stand. New Delhi, pp. 1–14, 1987. [4] M. T. S. Lakshmayya and G. Aditya, “Design of Rigid Pavement and its Cost-Benefit Analysis By Usage of Vitrified Polish Waste and Recron Polyester Fibre,” Int. J. Civ. Eng. Technol., vol. 8, no. 1, 2017. [5] S. M. Stacey, “Evaluation of ASTM C 494 procedures for polycarboxylate admixtures used in precast concrete elements.” 2016. [6] IS:516, “Method of Tests for Strength of Concrete,” Bur. Indian Stand. New Delhi,India, 2004. [7] ASTM C39-18, “Compressive Strength of Cylindrical Concrete Specimen.,” ASTM Stand., 2011, doi: DOI: 10.1520/C0150_C0150M-12.

Copyright

Copyright © 2024 Supriya ., Dr. Mirza Aamir Baig. 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.