— This paper investigated the effect of different nano-silica (NS) dosages (0, 1 %, 2 % and 3 % of the cement mass) on the salt-frost scaling resistance of recycled aggregate concrete (RAC), aiming at enhancing the microstructures for improving the durability of RAC in cold region.

 — 1. The addition of high surface mineral particles into the cement mixtures requires a higher quantity of water or plasticizers to maintain the concrete workability. 2. …

tensile strength. Optimal nano‑silica content was 1% and steel microbers 2%, giving compressive strength 122.5 MPa, tensile strength 25.4 MPa, modulus of elasticity 42.7 …

 — About 20%–30% of cement content can be reduced by nano silica. Thus, nano silica can be an alternative material to cement. However, the disadvantage of nano silica is its price and availability in certain countries. Some countries have to import nano silica to be used in concrete industry [4].

 — Micro silica particles (Devi et al., 2016) Nano silica particles (Devi et al., 2016) 3 They believed that the energy absorption capacity of rubber concrete could be accurately reflected using the ...

 — The compression strength of Nano-silica-based concrete was enhanced in the scope of 3.79 % and 11.95 % at the curing of three days, but the strength raise extended from 4.82 % to 18.86 % 5.96 % to 25.67 % at 7 and 28 days of curing. Rashid et al. [84] Nano-silica concrete: Powder 16 Nano-meter

 — The incorporation of nanotechnology has led to significant strides in the concrete industry, ushering in innovative construction methodologies. Various nanomaterials, including nano-silica (NS), have …

Nano-silica (nano-SiO2) is a high purity amorphous silica powder with a particle size about 1000 times smaller than cement particles (Lavergne et al., 2019). ... Qing et al. (2007) demonstrated that nanosilica concrete gained early strength than silica-fume concrete. Moreover, nanosilica particles acted as ultrafiller for microvoids inside the ...

 — 2. Nano-material and cement composites. In the construction industry, extensive research is going on to improve the performance of various building materials and development of durable and sustainable concrete is one among them as is clear from Table 1.Among all the nano-materials, nano-silica is the most widely used material in the …

 — 3.3 Abrasion Resistance. The abrasion resistance of the specimens was tested after 56 (Figure 3a) and 90-days (Figure 3b) in the freeze-thaw and deicing brine environment, in accordance with ASTM C779/C779M, Procedure C.At both 56 and 90-days the concrete mixture with the colloidal silica (NEC) exhibited a greater resistance to the …

 — The main purpose of this literature learning is to enumerate the effect of GGBS, Silica Fume, and Nano Silica on strength of concrete. The GGBS, Silica Fume and Nano-silica is a restored substitute as compared to orthodox additives like CaCl 2 and SiO 2 because of their effectiveness with a lesser amount of consumption. It was found that the ...

 — Several review studies have been performed on nano-silica-modified concrete, but this study adopted a new method based on scientometric analysis for the keywords' assessment in the current research area. A scientometric analysis can deal with vast bibliometric data using a software tool to evaluate the diverse features of the …

 — This study focuses on determining water permeability, water absorption, chloride permeability, and compressive strength of nano-silica added concrete. Nano-silica was utilized as a cement replacement material (0–3 wt %) to design and cast two different grade concrete mixes. The microstructure development of concrete was studied using …

 — Section snippets Effect of nano-silica on properties of fresh concrete. The interaction of nS particles in fresh concrete shows their influence on different properties of fresh concrete, such as workability, setting time, consistency, etc. Zhang et al. [34], [41] reported that the use of 2% nS particles in high-volume fly ash (HVFA) and slag …

 — Although, its disadvantage of cost and scarcity in some parts of the world, is unconnected to its demand; as some countries have to import Nano silica to be used in concrete industry . 3.2 Nano alumina. …

 — Substituting cement with 2 % Nano-silica in concrete enhanced compression strength by 20 %, 37 %, and 44 % at the curing of 7 days, 28 days, and 90 days. Ali et …

 — This paper discussed the effects of modified metakaolin (MK) with nano-silica (NS) on the mechanical properties and durability of concrete. In the first phase, trial mixes of concrete were prepared for achieving the desired value of the 28 days compressive strength, and the charge passed in rapid chloride permeability test (RCPT). In the …

 — 1. Introduction. Globally, concrete continues to be the most popular building material, due to its high demand in the construction industry. However, the production of cement for concrete accounts for 5–7 % of the global carbon dioxide (CO 2) emissions that lead to adverse environmental impact [1].A recent study found that the production of 1 …

Nano Silica Hydrogels for Rejuvenating Deteriorated Concrete Jon S. Belkowitz, PhD, PE Chief Technical Officer Intelligent Concrete, LLC. Nano Silica Hydrogels for Rejuvenating Deteriorated Concrete What is a Hydrogel? Hydrogels can be defined as materials formed by a porous three-dimensional network

 — In this study, a 3D printable low-carbon concrete with nano-silica (NS) pretreated recycled fine aggregates with 28 d compressive strength higher than 30 MPa is developed. The RA was treated by soaking in 5% NS slurry for 18 h and air-drying at a temperature of 28 ± 2 ℃ and relative humidity of 85 ± 5% for at least 7 days. Afterwards, …

 — Nano-silica concrete: 0.40: 35 nm: Colloidal: With different doses of nano-silica, the overall performance of concrete was greatly improved. When nano-silica was …

 — 3.1 Workability. It has been agreed that concrete workability is reduced with the inclusion of Nano-Silica in concrete. Higher surface area and aggregation of the …

 — 1. Among all the nano-materials, nano-silica is the most widely used material in the cement and concrete to improve the performance because of its pozzolanic …

 — The compressive strength of both ternary blended-based geopolymer concrete with nano silica and without nano silica had increased with the length of time, the concrete had been in place. Figure 2 ...

The emission of carbon dioxide gas from the cement manufacturing industry has raised concerns about global warming. Geopolymer concrete (GC) is gaining attention as a sustainable and environmentally friendly alternative to traditional cement concrete. The current study focused on using local clay to synthesize and characterize metakaolin …

 — Colloidal silica refers to a universal dispersion of nano silica particles, with nano being defined as particles ranging from 1 to 100 nanometers in diameter. To put it into perspective, a single strand of human hair has a diameter of approximately 100,000 to 150,000 nanometers. ... Using Colloidal Silica in Concrete: Rules for Use in Ready-Mix ...

 — Semi-hydrophobic nano silica, whose water contact angle is about 90°, accumulated on the liquid film to improve the stability [[30], [31], [32]]. Hydrophobic nano silica, whose water contact angle is greater than 90°, could adsorb on the surface of the hydrophobic end of the ing agents leading to an increase in stability [33].

 — The E5® (E5® Nano Silica, Inc, USA) with a 30% solid content of CNS was used in this study. The particle size of the nano-silica ranged from 8 to 17 nm. ... Properties of concrete incorporating nano-silica. Construct. Build. Mater., 36 (2012), pp. 838-844. View PDF View article View in Scopus Google Scholar [36] G. Land, D. Stephan.

 — Jeon I.K. et al. reported that the incorporation of 1% and 2% nano-silica in underwater concrete improved its compressive strength and elevated the resistance to carbonation and chloride penetration after …

 — Sadrmomtazi and Barzegar [11] stated that nano-silica being finer material can easily fill the pores between cement particles and fly ash leading to enhancement in concrete's compressive strength, having fly ash in large volume as a replacement of cement. It also diminishes bleeding &segregation (a common problem in fresh concrete) …