High-Strength, Waterproof, Corrosion-Resistant Nano-Silica Carbon Nanotube Cementitious Composites

Abstract

This study aims to prepare a nano-silica-carbon nanotube (NS-CNT) elastic composite using NS (nano-silica), CNTs (carbon nanotube), and (D3F) trifluoropropyltrimethoxysilane. The results show that the activated NS could promote the hydrolysis of D3F. Polymerization products of nano-silica and D3F are uniformly adhered onto the surfaces of CNTs, thereby forming a NS-CNT composite. The composite is composed of irregular ellipsoids of 3–12 μm in length and 2–10 μm in diameter. The activated NS-CNT composite material effectively promotes the further hydration of (CaOH)2 in the cement to form hydrated calcium silicate, and further dehydration–condensation between the surface hydroxyl group of the composite material and the inherent hydroxyl group of (CaOH)2. The cementitious composite-based composites containing the activated NS-CNT exhibit high mechanical strengths, high water resistances, and good durability and corrosion resistance. The chemical characterizations reveal the morphology, nucleation mode of the composite, and its influence on the hydration structure and products of cementitious composite.

Innovative approach for the protection of recycled concrete by biogenic silica biodeposition

“…The curves for the two samples then diverge with the rate of absorption for C-samples increasingly higher than that for D-samples which causes the absorption times of the D samples to increase. These results demonstrate that diatomaceous silica is an effective waterproofing treatment for concrete creating a similar hydrophobicity as observed for nano-Silica coatings [31].…”

“…Thus, diatom distribution throughout the biofilm is heterogeneous, with micro-scale variations [21] dependant on surface roughness and microtopography [23]. In addition, physical, chemical and biological changes in the environment also affect diatom communities causing temporal fluctuations in population numbers and distribution [21].To date, research into protective bio-treatments for concrete has considered the use of bacterial calcium carbonate biodeposition [25][26][27][28] or the direct application of laboratorysynthesised nano-silica [29][30][31][32].…”

A Review of Nanotechnology in Self-Healing of Ancient and Heritage Buildings

“…Nano-coating in architecture and building applications refers to the utilization of nanotechnology-based coatings to enhance the performance and functionality of various surfaces and materials employed in the construction industry [66][67][68][69][70][71][72]. These coatings are formulated to bestow unique properties and enhance the durability, aesthetics, energy efficiency, and sustainability of buildings.…”