The increasing research endeavors on nanotechnology encompasses a number of disciplines including the aspects of sustainable construction in civil and environmental engineering. Tremendous achievements have been reported on nanotechnology adoption on sustainable construction, but there are so much more to …

Physical characteristics of Nano silica is introduced in Table 1. Table 1. Physical properties of Nano Silica Nano-SiO2 Phase Specific gravity Ave particles size (nm) pH Electrical conductivity (mS/cm) Clear liquid (colloid) 1.10 2.1 9-11 3.47 The properties of fine and coarse aggregate which is used in this study are shown in Table 2.

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). ... The results concluded that nanosilica had positive influence on mechanical properties and durability of concrete specimens. Additionally, mechanical properties and durability of ...

Observing the effects of the NS ratio on compressive strength in Fig. 3, it can appear that for various age groups, the compressive strength increases when the rate of NS used is less than or equal to 1.5%.As the NS ratio increases from 2 to 3%, the compressive strength increases marginally and has tended to decrease compared to NS's ratio using …

Some nano particles used in nano concrete have photocatalytic properties, which enable self-cleaning abilities by breaking down pollutants and organic matter when exposed to light. Nanotechnology offers …

Nowadays, the application of nanotechnology has gained increased attention in the concrete technology field. Several applications of concrete require light weight; one such concrete used is ed concrete (FC), which has more voids in the microstructure. In this study, nano-silica (NS) was utilized …

The overall effect of nano silica on the concrete mix can be attributed to its nano size which has a large effect in reinforcing the properties of the binder.

In this study, the mechanical properties of concrete composites containing waste PET (polyethylene terephthalate) and nano-silica were investigated to produce the lighter, more flexible and high-strength concrete. For this purpose, the different content of nano-silica was added to concrete containing 10 wt.% of waste PET aggregates. The …

In this context, the aim of the present research is to create a practical application method and a model to use newly developed nano-silica produced from olivine as well as commercial (available ...

The cement used was Type II/VI Portland cement, which meets ASTM C 150 (Standard Specification for Portland Cement). The main composition and properties of the cement used are presented in Table 1.Six mixtures were prepared and Class F fly ash, whose composition and properties are also shown in Table 1, was used in three …

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 …

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 …

Concrete Mixes • Used in Conjunction with Existing CMD • 3% Addition of Silica Fume • 30% Slag Replacements • Use 4 oz/cwt Internal Cure Nano Silica • Use NEW Mix Option 2 For Existing Construction Memorandums • Reduce Cement to 550-650 lbs/cyd • Incorporate 4 oz/cwt Internal Cure Nano Silica • Incorporate 8 oz/cwt Liquid Fly Ash

The damage of concrete is often caused by internal microstructural defects. Nano silica (NS) has excellent pozzolanic properties, and with an appropriate content of NS as auxiliary cementing material, it can promote the generation of C-S-H gels in addition to serve as internal filler, thus improves the micro-scale defects in concrete.

The mechanical and microstructural characteristics of the High-Strength Concrete (HSC) for M50 grade and 0.31 as the w/b ratio were evaluated experimentally. A total of 31 mixes were cast with various amounts of polycarboxylate ether (PCE) chemical admixture, 0.9% weight of cement, Bio-Admixture (BA) (10 ml, 20 ml, and 30 ml), and …

Nano-silica in the concrete mixtures has led to an improvement in the properties of concrete [11]. In SCC the essential properties and characteristics of concrete containing nano-silica particles, a huge piece of them base on the usage of nano-silica as an enemy of dying. [Quercia, et al. [7]].

Colloidal nano-silica was studied in concrete with and without fly ash. Two dosage levels of nano-silica in concrete mixtures were evaluated. Adding nano-silica …

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]. 6. Nano alumina

Colloidal Nano-Silica Defined. Small particles consisting of an amorphous SiO2 core with hydroxylated surface. Typically between 1 and 500 nm. Insoluble in water. Small enough …

Nano-silica (NS) may counteract the drawbacks of fly ash (FA), such as delayed setting and low early strength, by accelerating hydration and providing higher early strength in concrete. In this study, concrete mixtures having 4 different FA replacement ratios (0%, 20%, 35%, and 50% by vol.) and 3 different NS dosages (0%, 1.7%, and …

It was noted that the application of nano-silica in cement-based composites is beneficial when used up to an optimal dosage of 2–3% due to high pozzolanic reactivity and a filler effect, whereas ...

Structural Concrete is a structural engineering journal publishing research on all aspects of concrete structures, including design, construction, demolition, and sustainability. The effect of presoaking of recycled coarse aggregate (RCA) in nano silica (NS) solution on the properties of recycled aggregates concrete is compared with the …

1. Introduction. The bond behavior between the old concrete and repair material is one of the most important factors affecting the maintenance and reinforcement of existing concrete structures [1], [2], [3].Adding nanomaterials into cement-based repair materials can improve the performance of repair materials and enhance the repair effect …

This study presents experimentally the collective consequence of using nano silica (NS) on mechanical properties of tough concrete. NS is cast-off as partial cement substitution by 1,1.5,2 wt% . Mechanical properties of hardened concrete are assessed expending different mixtures between NS. Important enhancement in the mechanical …

The aim of this study is to evaluate the effects of inclusion nano-silica (also known as nano-SiO2) on the properties of pervious concrete containing fly ash (FA) as a partial replacement to cement.

The nano particle used in this study is nano silica which replaces cement about 1 and 2% by weight, and the micro steel fibers are added about 0.4% volume of concrete.

In this study, a nano-SiO2 modified waterborne polyurethane (WPU) adhesive with remarkably low VOC content and high adhesion performance was successfully synthesized via in situ polymerization. The influence of nano-silica concentration on different properties of the aqueous-based adhesive and the casted …

According to Chinese national standard GB175-2020 [23], the following materials were used in this experiment: type II portland cement (i.e., grade 52.5), whose chemical composition and physical properties are shown in Table 1, containing CaO and SiO2 mass fractions of 62.05% and 21.2%, respectively, 3580 cm 2 /g specific surface …

Mohammed et al. evaluated the influence on the properties of concrete due to the nano-silica inclusion. This nano-silica incorporation caused a reduction of 13% in the pore amount of the cementitious paste. They studied the relationships that improved the compression strength of the concrete. The workability was modified negatively, which …

Incorporating nano-silica into concrete mixtures reduces porosity and enhances the pozzolanic breakdown of nano-silica with calcium hydroxide, causing the …