What is it about?

Generally, the fine aggregate of the concrete mix facilitates a huge workable one. Currently, there is a demand in river sand supply to undertake construction work. Compared to the river sand, M-Sand works as an eco-friendly resource. Metakaolin, introduced to increase the compression and the bending nature of concrete. Steel fibre is used to measure the ductility of the concrete. The experimental work carried out by preparing five concrete mixtures varying 10% of M-Sand ranging 60–100 percent by weight of fine aggregate, 15% by weight of cement, and 1% by volume of steel fibre; the fraction kept constant based on previous studies. Various proportions of M30grade concrete were examined by conducting mechanical and flexural behaviour tests. The results obtained are satisfactory for 80% of the M-Sand replacement. Additional M-Sand replacement tends to reduce concrete strength.

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Why is it important?

Concrete is an artificial material made together by mixing cementitious materials with fine aggregates, coarse aggregates, and water in sufficient proportions. There is a need for the supply of river sand to carry out construction work. Due to the lack of an enormous reserve, M-Sand used as an alternative to river sand; it is made from granite, formed from igneous rock blasted to create small cubic particles with prepared edges and graded as a building material. M-Sand in concrete is said to be durable when it has the required strength in its efficiency. Thus, resolving the faults occurred in the domain of voids, capillary, honeycombing, and segregation.

Perspectives

Metakaolin minimizes concrete pores to achieve greater strength, gives stability to the mixture, and prevents acid and sulphate attack from the structure. The diffusion of fibres in concrete dramatically increases the mechanical properties of concrete, including fatigue behaviour. The mechanical properties of fibre integrated concrete tested a cumulative strength increase of 1.143% in SFRC 3 compared to the control mix proportion in the compression test and 1.65% in the split tensile strength test.

Dr Gobinath R
SR University, Warangal

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This page is a summary of: Mechanical and flexural behaviour study on fibrillated concrete as partial replacement of M-Sand and metakaolin, Materials Today Proceedings, January 2021, Elsevier,
DOI: 10.1016/j.matpr.2020.09.507.
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