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.

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 Experimental Study on the Mechanical Properties of Concrete using Micro Silica and Nano Silica - A Step Towards Sustainability

2016 ◽  
Vol V5 (11) ◽  
Author(s):  
Myriam Marie Delcasse ◽  
Nirmith .S. Kumar,Ashwith .S. ◽  
Nikethan .M.S. ◽  
Sunil Kumar .S. Nayak ◽  
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Nano Silica ◽  
Micro Silica

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 The Study of the Effect of Nano -Materials on the Mechanical Properties of Polymer Matrix Composite Materials

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Ibrahim A. Atiyah
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Polymer Matrix ◽  
Essential Role ◽  
Industrial Applications ◽  
Polymer Matrix Composite ◽  
Nano Materials ◽  
Nano Silica ◽  
Micro Silica ◽  
Micro Fillers

In a lot of industrial applications the Composite materials have an essential role. The manufacturing of the new composite materials is intended improve the materials applicability. In this work, the influence of silica Nano filler type-and compared that effect with that of silica micro fillers-on mechanical properties of polyester have been investigated. For this purpose, mechanical testing have been used. The addition of Nano  silica and micro silica was in different percentages 1%, 3%, and 5%, due to the fact that Polyester is one of matrix of polymer that is frequently used with strengthening fibers for sophisticated applications of composites because of its resistance to corrosion, cost that is low, smooth coping, and its ability to prevent the outbreak of flame.  

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 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.

Evaluation of the effects of nanomaterials on durability of engineered cementitious composites exposed to the aggressive environment

2019 ◽  
Vol 54 (14) ◽  
pp. 1807-1817 ◽  
Author(s):  
Alireza Mansoori ◽  
Kiachehr Behfarnia
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Carbon Nanotube ◽  
Nano Silica ◽  
Aggressive Environment ◽  
Freeze And Thaw ◽  
Micro Silica ◽  
Microscopy Images ◽  
Scanning Electron

The present study was aimed to evaluate the effect of micro silica, nano silica and carbon nanotube in the engineered cementitious composites made with polyvinyl alcohol fibers. Accordingly, the compressive strength and the modulus of the samples rupture were studied to evaluate the impact of micro silica, nano silica and carbon nanotube in engineered cementitious composite. In addition, different curing conditions were considered to investigate the durability of the mixes. In this regard, the mechanical properties of the samples cured in sulphuric acid and freeze and thaw cycling were compared to those cured in water. The results indicated that the mechanical properties were reduced upon exposure to acid and freeze and thaw cycling. It was also found that the application of micro silica and nano silica made the mixtures compacted and reduced the permeability. The module of rupture was increased significantly by the addition of carbon nanotube. Moreover, the evaluation of the samples cured in the aggressive environment showed that the role of carbon nanotube was significant in increasing the durability of the mixes. Further, the scanning electron microscopy images showed that the crack width was reduced by the addition of carbon nanotube. It was also revealed from the scanning electron microscopy images that the polyvinyl alcohol fibers were completely interacted and connected to the paste.

scholarly journals Performance evaluation of nano-silica concrete

2020 ◽  
Vol 184 ◽  
pp. 01076
Author(s):  
Kakara S J Kumar ◽  
M V Seshagiri Rao ◽  
V Srinivasa Reddy ◽  
S Shrihari
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Performance Evaluation ◽  
Nano Silica ◽  
Interface Zone ◽  
Nano Sio2 ◽  
Concrete Quality ◽  
Micro Silica ◽  
Non Destructive ◽  
Non Destructive Techniques

In this paper, the study of the influence of nano-silica (nano-SiO2) on the properties of the interface between CSH gel and cement particles and its effect on nano-mechanical properties of the products at the interface zone was examined. In this paper M50 grade SCC mixes were developed using 5% micro-silica and various percentages of 0.5%, 1.0% and 1.5% nano-SiO2. For 1.0% nano-SiO2 addition to M50 grade SCC mix, the compressive strength is maximum. Similarly concrete quality using non-destructive techniques, water absorbtion capacity and porosity are also assessed.

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