Mechanical properties and durability of self consolidating cementitious materials incorporating nano silica and silica fume

2014 ◽  
Vol 14 (2) ◽  
pp. 175-191 ◽  
Author(s):  
Mahdi Mahdikhani ◽  
Ali Akbar Ramezanianpour
Keyword(s):  
Mechanical Properties ◽  
Silica Fume ◽  
Cementitious Materials ◽  
Nano Silica

Utilization of Nano Silica as Cement Paste in Mortar and Porous Concrete Pavement

2015 ◽  
Vol 1113 ◽  
pp. 135-139 ◽  
Author(s):  
Mohd Yusak Mohd Ibrahim ◽  
Putra Jaya Ramadhansyah ◽  
Hainin Mohd Rosli ◽  
Mohd Haziman Wan Ibrahim ◽  
M.N. Fadzli
Keyword(s):  
Mechanical Properties ◽  
Cement Paste ◽  
Cementitious Materials ◽  
Concrete Pavement ◽  
Strengthening Effect ◽  
Nano Silica ◽  
Porous Concrete ◽  
The Right

The high percentage of porosity in porous concrete pavement tends to decrease its strength. In concrete industry, nano silica is one of the most popular materials that will improve the properties of cementitious materials. This paper, prepared to review the effect of nano silica in cement paste and mortar related to porous concrete pavement. It was found that, by incorporating nano silica with the right composition in cement paste and mortar, it will improve their mechanical properties. By incorporating nano silica in the mixture, it can be predicted that the strengthening effect of nano silica would be further enhanced in porous concrete because the nano silica improve not only the cement paste, but also the interface between paste and aggregate.

scholarly journals The effect of Vietnam’s nano-silica on mechanical properties of high-performance concrete

2021 ◽  
Vol 72 (1) ◽  
pp. 76-83
Author(s):  
Lam Le Hong ◽  
Lam Dao Duy ◽  
Huu Pham Duy
Keyword(s):  
Compressive Strength ◽  
Silica Fume ◽  
High Performance ◽  
High Performance Concrete ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Nano Silica ◽  
Nano Sio2 ◽  
Curing Period ◽  
Compressive Strength Test

The demand for High Performance Concrete (HPC) is steadily increasing with massive developments. Conventionally, it is possible to use industrial products such as silica fume (SF), fly ash, as supplementary cementitious materials (SCM), to enhance the attributes of HPC. In recent years, nano-silica (NS) is used as an additive in added mainly to fill up the deviation arises with the addition of SF for HPC. This study aims to optimize the proportion of NS (produced in Vietnam) in the mixture used for fabricating 70 MPa high-performance concrete. SiO2 powder with particle size from 10 to 15 nm were used for mixing. A series of compressive strength test of HPC with nano-SiO2 varied from 0 to 2.8 percent of total of all binders (0%, 1.2%, 2%, 2.8%), and the fixed percentage of silica fume at 8% were proposed. Results show compressive strength increases with the increase of nano-SiO2, but this increase stops after reaching 2%. And at day 28 of the curing period, only concrete mixture containing of 8% silica fume and 2% nano-SiO2, had the highest compressive strength.

scholarly journals Combined effects of nano-silica and silica fume on the mechanical behavior of recycled aggregate concrete

2021 ◽  
Vol 10 (1) ◽  
pp. 819-838
Author(s):  
Tang Yunchao ◽  
Chen Zheng ◽  
Feng Wanhui ◽  
Nong Yumei ◽  
Li Cong ◽  
...  
Keyword(s):  
Silica Fume ◽  
Structural Engineering ◽  
Tensile Tests ◽  
Cementitious Materials ◽  
Recycled Aggregate Concrete ◽  
Supplementary Cementitious Materials ◽  
Recycled Aggregate ◽  
Hydration Reaction ◽  
Nano Silica ◽  
Aggregate Concrete

Abstract Recycled aggregate concrete (RAC) is an environmentally friendly material. However, owing to inherent characteristics of the recycled aggregate (RA), it is difficult to promote and apply it in structural engineering. Silica fume (SF) and nano-silica (NS) have different characteristics as additives for RAC. It has been proven that adding SF only enhances the strength of RAC at a later stage, and NS can improve the early strength of RAC owing to its high pozzolanic activity. In this study, to further improve the properties of RAC, two types of additives were combined into RAC, which was named SF-NS-modified RAC (SSRAC). Compression and split tensile tests were conducted to analyze the mechanical properties of SSRAC at different curing ages. The results indicated that the combined addition of NS and SF improved the performance of RAC at early and later curing ages. Scanning electron microscopy and X-ray diffraction analyses were performed to explore the NS and SF mechanism. The results indicated that SF and NS in SSRAC had a good pozzolanic effect and underwent a secondary hydration reaction with calcium hydroxide to increase the production of calcium silicate hydrate, resulting in an increase in the properties of the interface transition zone. Finally, 6% SF and 2 or 3% NS are recommended as supplementary cementitious materials for RAC.

scholarly journals Effect of nano-silica as cementitious materials-reducing admixtures on the workability, mechanical properties and durability of concrete

2021 ◽  
Vol 10 (1) ◽  
pp. 1395-1409
Author(s):  
Changjiang Liu ◽  
Xin Su ◽  
Yuyou Wu ◽  
Zhoulian Zheng ◽  
Bo Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Building Materials ◽  
Setting Time ◽  
Microscopic Analysis ◽  
Chloride Ion ◽  
Cementitious Materials ◽  
Hydration Reaction ◽  
Ion Permeability ◽  
Nano Silica ◽  
Durability Of Concrete

Abstract Nano-silica (NS) is one of the most important nanomaterials in recent years. It is used as a new cement-based composite reinforcement in building materials because of its high volcanic ash activity. In order to achieve the goal of carbon peaking and carbon neutralization, combined with the research idea of cementitious materials-reducing admixture for concrete, under the condition of reducing the amount of cement in concrete by 20%, the influence of different dosages of NS on the setting time and mechanical properties of concrete was analyzed. In addition, the shrinkage performance, impermeability, and resistance to chloride-ion permeability of concrete were also studied. The results show that under the same curing conditions and ages, when the NS dosage is 2.5%, the compressive strength and splitting tensile strength of the specimen after 28 days of curing are the highest, reaching 40.87 and 3.8 MPa, which show an increase by 6.6 and 15.15%. The shrinkage performance of concrete increases with the increase in NS dosage. In addition, when the NS dosage is 2.0%, the durability of concrete has also been greatly improved. The impermeability of concrete increased by 18.7% and the resistance to chloride-ion permeability increased by 14.7%. Through microscopic analysis it was found that NS can promote the hydration reaction, generate more hydration products such as calcium silicate hydrate (C–S–H), enhance the interfacial adhesion between the matrix and the aggregate, and form a closer interfacial transition zone. Moreover, the addition of NS also reduces the cumulative pore volume in concrete, refines the pore size, and makes the internal structure of concrete denser.

scholarly journals Multi-Objective Optimization of Nano-Silica Modified Cement-Based Materials Mixed With Supplementary Cementitious Materials Based on Response Surface Method

2021 ◽  
Vol 8 ◽  
Author(s):  
Xiuzhi Zhang ◽  
Liming Lin ◽  
Mengdi Bi ◽  
Hailong Sun ◽  
Heng Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Response Surface ◽  
Cementitious Materials ◽  
Plastic Viscosity ◽  
Supplementary Cementitious Materials ◽  
Quadratic Term ◽  
Multi Objective Optimization ◽  
Nano Silica ◽  
Surface Method ◽  
Cement Based Materials

This paper investigates the effect of supplementary cementitious materials (SCMs) on the fresh and mechanical properties of nano-silica modified cement-based materials (NSMCBM) based on the response surface method (RSM). Fly ash (FA), ground granulated blast-furnace slag (GGBFS), and silica fume (SF) were selected and the Box-Behnken design (BBD) method was used to design mix proportion. Besides, the quadratic term model was used to describe the relationship between independent variables and responses including fluidity, yield stress, plastic viscosity, thixotropy, and 3, 7, 28, and 56 d compressive strength. Based on the quadratic term model, the response surface of each response was drawn to understand the influence of SCMs. Results showed that FA had significant effect on fluidity and thixotropy while three kinds of SCMs had extremely significant effect on plastic viscosity. Response surface plot showed that NS could increase the plastic viscosity of NSMCBM to 1.445 Pa•s (M16). However, the addition of FA and GGBFS decreased the plastic viscosity to 0.9 Pa•s, which was comparable with the reference sample (M17). Such value was 37.7% lower than that of M16. Meanwhile, NS complemented the reduction of compressive strength caused by SCMs. Thus, the synergy effect of SCMs and NS could improve both fresh and mechanical properties. At last, multi-objective optimization was utilized to optimize the proportion of SCMs considering the interaction between SCMs to achieve desirable parameters.

scholarly journals Propiedades reológicas y mecánicas de un hormigón autocompactante con adición de nano-sílice y micro-sílice

2016 ◽  
Vol 6 (1) ◽  
pp. 1-14
Author(s):  
E. Sánchez ◽  
J. Bernal ◽  
A. Moragues ◽  
N. León
Keyword(s):  
Mechanical Properties ◽  
Silica Fume ◽  
Binary Mixtures ◽  
High Performance ◽  
Durable Resistance ◽  
Nano Materials ◽  
Nano Silica ◽  
Self Compacting Concrete ◽  
Palabras Clave ◽  
Micro Silica

Propiedades reológicas y mecánicas de un hormigón autocompactante con adición de nano-sílice y micro-síliceRESUMENEl hormigón autocompactante es el resultado de diseñar mezclas de calidad con capacidad para asegurar su correcta colocación en estructuras fuertemente armadas en las cuales el proceso del vibrado resulta muy complicado y con riesgo de alterar la posición de las armaduras. Unido a las ventajas de este hormigón y debido a la mayor demanda de hormigones de altas prestaciones, se utiliza humo de sílice y, más recientemente, nanomateriales como adiciones. Principalmente nano-sílice. El objetivo de este trabajo es obtener hormigones autocompactantes con nano-sílice, humo de sílice y mezclas binarias de ambas adiciones que satisfagan la demanda de altas resistencias mecánicas y durables, determinando que la dosificación con mejores prestaciones es la que contiene 2.5% de nano y 2.5%.de humo de sílice. Palabras clave: Autocompactante; nanosílice; humo de sílice; reología; propiedades mecánicas. Rheological and mechanical properties of self-compacting concrete with the addition of nano-silica and microsilicaABSTRACTSelf-compacting concrete is the result of designing a quality concrete with the capacity to ensure placement of reinforcement in heavily reinforced structures in which the process of vibrating is very complicated and risky by altering the position of the reinforcement. Together with the advantages of this concrete and due to the increased demand for high-performance concretes, the silica fume, and more recently, the nano-materials are used as additions, but mainly the nano-silica. The objective of this work is to obtain self compacting concrete with nano-silica, silica fume and binary mixtures of the two additions to meet the demand for high mechanical and durable resistance. The mix with better performance is that with 2.5% of nano-sílica and 2.5% silica fume. Keywords: self-compacting concrete; nanosilica; silica fume; rheology; mechanical properties. Propriedades reológicas e mecânicas de um concreto auto adensável, com a adição de nano sílica e de micro sílica (sílica ativa)RESUMOO Concreto Auto-adensável é o resultado da concepção de um concreto de qualidade com a capacidade para assegurar a colocação de reforço em estruturas fortemente armados em que o processo de vibração é muito complicado e arriscado por alterar a posição da armadura . Juntamente com as vantagens deste concreto e devido ao aumento da procura de concretos de alto desempenho , o fumo de sílica e mais recentemente , os nano-materiais são usados como adições . Principalmente a nano- sílica. O objetivo deste trabalho é a obtenção de concreto auto- adensável com nano- sílica , sílica ativa e misturas binárias das duas adições para atender a demanda de alta resistência mecânica e durável. A mistura com melhores desempenhos é aquela que contém 2,5 % de nano - sílica e 2,5% de pó de sílica . Palavras-chave: Auto-compactável; nano-sílica; sílica activa; reologia; propriedades mecánicas. 

scholarly journals Mechanical and Rheological Properties of 3D Printable Cement Composites

2020 ◽  
Vol 2 (4) ◽  
Author(s):  
Maathar Al Qasimi ◽  
Dhafer Mana Al Zulayq ◽  
Mostafa Seifan ◽  
Keyword(s):  
Mechanical Properties ◽  
Complex Geometry ◽  
Failure Surface ◽  
Total Solid ◽  
Cementitious Materials ◽  
Cement Composites ◽  
Nano Silica ◽  
Solid Matter ◽  
Hardened Properties ◽  
Micro Silica

Additive manufacturing is a recent revolution in the construction field since cementitious materials became printable. This extrusion technique has enabled the construction of very complex geometry with a reduction in costs, time and labour interventions. This study aims to evaluate the possibility of reinforcing 3D printable cementitious composites with the use of nano and micro materials, particularly nano silica, micro silica and microfibrillated cellulose (MFC) which are known for their ability to enhance the fresh and hardened properties of cement-based composites. Rheology property test, flowability and mechanical properties are the types of tests performed to evaluate the fresh and hardened properties of mortar modified with the rested additives. The results show the addition of MFC of 0.4% (of total solid matter) can significantly enhance the mechanical property. In addition, the presence of MFC (at 0.4% of total solid matter) can reduce the pressure required to extrude the mortar, enabling a steady state extrusion. It was also found that 1% nano silica addition significantly improves the mechanical properties and minimizes segregation in the failure surface.

scholarly journals Mechanical Properties and Durability Performance of Concrete Containing Calcium Carbide Residue and Nano Silica

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6960
Author(s):  
Musa Adamu ◽  
Yasser E. Ibrahim ◽  
Mohamed E. Al-Atroush ◽  
Hani Alanazi
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Environmental Sustainability ◽  
Ph Value ◽  
Calcium Carbide ◽  
Cementitious Materials ◽  
Cement Matrix ◽  
Nano Silica ◽  
High Calcium ◽  
Calcium Carbide Residue

Calcium carbide residue (CCR) is the end-product of production of acetylene gas for the applications such as welding, lighting, ripening of fruits, and cutting of metals. Due to its high pH value, disposing of CCR as a landfill increases the alkalinity of the environment. Therefore, due to its high calcium content, CCR is mostly blended with other pozzolanic materials, together with activators as binders in the cement matrix. In this study, cement was partially substituted using CCR at 0%, 7.5%, 15%, 22.5% and 30% by weight replacement, and nano silica (NS) was utilized as an additive by weight of binder materials at 0%, 1%, 2%, 3% and 4%. The properties considered were the slump, the compressive strength, the flexural strength, the splitting tensile strength, the modulus of elasticity, and the water absorption capacity. The microstructural properties of the concrete were also examined through FESEM and XRD analysis. The results showed that both CCR and NS increase the concrete’s water demand, hence reducing its workability. Mixes containing up to 15% CCR only showed improved mechanical properties. The combination of CCR and NS significantly improved the mechanical properties and decreased the concrete’s water absorption through improved pozzolanic reactivity as verified by the FESEM and XRD results. Furthermore, the microstructure of the concrete was explored, and the pores were refined by the pozzolanic reaction products. The optimum mix combination was obtained by replacing 15% cement using CCR and the addition of 2% NS by weight of cementitious materials. Therefore, using a hybrid of CCR and NS in concrete will result in reduction of cement utilization in concrete, leading to improved environmental sustainability and economy.

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