Colloidal Nanosilica Effect on the Properties and Durability of Coir Reinforced Cement Brick

Abstract

The impact of nanosilica on the properties and microstructure of cement-based products has lately attracted a lot of attention. The effects of colloidal nanosilica (CNS) at different concentrations on the hydration process and performance of cement-based composites reinforced with coconut coir were examined in this study. CNS was applied at concentrations of 0%, 2%, 4%, and 6% by weight of cement, respectively. The samples were evaluated in terms of flexural test, scanning electron microscopy (SEM), thermogravimetric analysis (TG-DTG), and X-ray Diffraction (XRD) after 7, 28, and 60 days of curing. Flexural strength improved by 13%, 11%, and 23% in the presence of CNS after 7, 28, and 60 days of hydration, respectively, as compared to the samples without CNS addition. The highest flexural strength was reported in samples containing 4% CNS. Beyond this, flexural strength decreases noticeably owing to the presence of too much nanosilica, which repressed the hydration process. The predominant causes of sample failure appear to be fiber breakage and fiber pull-out. In the sample containing 4% CNS, a dense structure was seen. The fibers had a strong bond with the matrix, showing that fiber/matrix bonding was improved. CNS served as a pozzolanic reaction promoter, converting CH to C-S-H, and a filler to improve cement microstructure. The CH content decreased when CNS was added, while the C-S-H gels increased.

Influence of nano silica on impact resistance and durability of fly ash concrete in structural buildings

“…Many features of concrete like flow ability, mechanical properties, and durability can be enhanced by incorporating nanoparticles due to their excellent properties. Several researchers have undertaken various studies based on adding low-dose nanomaterials to replace the binder in concrete mixes in order to improve the characteristics of concrete, with successful outcomes [3][4][5][6]. The inclusion of nano-silica (NS), nano CaCO 3 , or nano TiO 2 particles demonstrated a great increase in the physical characteristics and durability of concrete due to its nucleation and micro-aggregate filling effects.…”

Influence of Nano Silica On Properties of Cement Concrete

“…It provides a sustainable way to cut down on cement usage and increase the longevity of concrete, especially in coastal projects. [6] 2021 HishamShah.et.al., [7] 2022 concentrated on the various amounts of colloidal nanosilica (CNS) influenced the properties of cement composites reinforced with coconut coir. It was found that adding 4% CNS considerably improved the fibre/matrix bonding and pozzolanic methods, which in turn improved the flexural strength and microstructure of the samples.…”