No abstract

The combined impact of using banana fibres (BF) and nano-silica (NS) on the mechanical properties of hardened concrete is examined in this study. In order to partially replace cement, NS has been used in amounts of 0, 2, 2.5, 3, 3.5, 4, and 4.5% by weight, and BF has been used in amounts of 1, 2, 3, 4, and 6% by volume. Banana fibres measuring 40 mm in length were used in the current experiment. A variety of NS and BF combinations are used to calculate the test values for compression strength, split tensile strength, and pulse velocity. Due to its tiny particle size, nano-silica can change the properties of concrete by changing its microstructure. Because of NS's high pozzolanic activity, which supports the generation of more C-S-H gel in the presence of nanoparticles, a noticeable improvement in the strength qualities of concrete is shown when NS is utilised. The strength and longevity of the concrete will be greatly enhanced by the use of NS. On the other hand, the inclusion of banana fibres to the concrete gradually reduces permeability and improves crack resistance.

Concrete is most suitable construction material. And it will adapt very well with the situations in the site. This concrete is considered as a homogeneous material but it is mixture of cement and fine aggregate and coarse aggregate and water. There are various methods in-order for concrete to gain strength, replacing the contents of concrete is also a way but partially is considered optimum. Now main binding agent in the concrete is the cement content so by partially replacing the cement by various cementitious materials like GGBS and tio2 will give optimum results in raised strength values of concrete. In this study a small trial is done to modify the properties of concrete by partial replacement of cement with GGBS of a percentage 10%, 20%, 30% and 40% and TIO2 of percentages of 0.6%, 0.8%, 1.0% and 1.25%. Different tests are done to determine Compressive Strength and split tensile strength All the cubes are used for 7 & 28 days.

Currently, there is a significant demand for residential and commercial structures due to the population's fast increase. Concrete is essential for the construction of every building. To prepare concrete, several components are required. Owing to the ongoing development activity, these natural resources running out in an effort to preserve these assets, found marble dust here when researching for a substitute, why due to the fact that it is a byproduct of the marble industry .It has an impact on both the environment and people's health, therefore to reduce these damages and preserve our natural resources, intended to use this marble dust in place of fine aggregate .We intended to use banana fibre in order to improve the strength to the pavement. The percentages of substitution for marble dust are 0%, 5%, 10%, 15%, 20%, and 25%. Additionally, a proportion of 0%, 1.1%, 2.1%, 3.1%, 4.1%, and 5.1% of banana fibre is added. By using these percentages, we cast various cubes, and after evaluating them, we came to the conclusion that a 15% replacement provided the greatest results overall. And the tests we ran were the Compressive strength and Split Tensile Test. We utilised M20 concrete, which is a grade.

The world is rapidly changing, and building construction is becoming increasingly important. If we look at it closely, the use of concrete increases, resulting in a scarcity of natural resources. To save our natural resources, replace some of the concrete proportions with the following methods. Using equal quantities of fly ash and metakaolin, fly ash and GGBS as admixtures in geopolymer concrete (50-50%). The results of the compressive strength split tensile strength, for 28, 56 and day strength tests. The combination of two admixtures and a super plasticizer allowed the strength parameters to be increased.