Research on Mechanical Properties of Nano-Concrete

2012 ◽  
Vol 628 ◽  
pp. 50-54 ◽  
Author(s):  
Yi Zhi Yan ◽  
Zhi Min Su ◽  
Liang Wu
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
High Performance ◽  
High Performance Concrete ◽  
Fiber Reinforced Concrete ◽  
Nano Materials ◽  
Green Concrete ◽  
Nano Sio2 ◽  
Strength And Durability

This paper describes some of the characteristics of nano-materials are discussed nano SiO2, silica fume and nano-scale carbon-fiber reinforced concrete to improve strength and durability of the role of nano-SiO2, silica and carbon nano-fibers can be prepared as an admixture of high performance concrete, nano materials can also be used as a preparation mixed with Division of concrete with special features, such as metal oxides can be prepared by adding nano smart concrete and green concrete, metal powder can be prepared by adding nano electromagnetic shielding concrete.

Influences of Interfacial Properties on High-Performance Concrete Composites

1994 ◽  
Vol 370 ◽  
Author(s):  
D.M. Roy ◽  
W. Jiang
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Interfacial Properties ◽  
Fiber Reinforced Concrete ◽  
Interfacial Region ◽  
Rock Aggregate ◽  
Strong Motivation ◽  
Strength And Durability ◽  
Composite Interfaces

AbstractThere is a strong motivation to study the interfacial properties of concrete composites because the interfacial region is often the phase where fracture first develops. The aim of this study is to understand phenomena which are unique at high-performance concrete composite interfaces, and how these influence the bulk properties of a concrete composite. Since processes at interfaces must be considered over a range of scales varying from the atomic to the macroscopic, multidisciplinary research approaches are desirable. Model cement/rock (aggregate) and matrix/fiber interaction experiments were carried out. Morphology and microstructure of interfacial regions among mortar/rock, and fiber/matrix were examined utilizing SEM. Computer image analysis performed along a perpendicular to the interface revealed compositional and physical irregularities. The variations in the volume of pores adjacent to interface zones are documented and supported by microscopic observation. The influences of interfacial properties on concrete composite strength and durability are discussed, and influences of fibers on the fracture and fracture resistance behavior are also discussed. Analyses of debonding along interfaces are used to define the role of debonding in fiber-reinforced concrete composites.

Influences of Interfacial Properties on High-Performance Concrete Composites

1994 ◽  
Vol 370 ◽  
Author(s):  
D.M. Roy ◽  
W. Jiang
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Interfacial Properties ◽  
Fiber Reinforced Concrete ◽  
Interfacial Region ◽  
Rock Aggregate ◽  
Strong Motivation ◽  
Strength And Durability ◽  
Composite Interfaces

AbstractThere is a strong motivation to study the interfacial properties of concrete composites because the interfacial region is often the phase where fracture first develops. The aim of this study is to understand phenomena which are unique at high-performance concrete composite interfaces, and how these influence the bulk properties of a concrete composite. Since processes at interfaces must be considered over a range of scales varying from the atomic to the macroscopic, multidisciplinary research approaches are desirable. Model cement/rock (aggregate) and matrix/fiber interaction experiments were carried out. Morphology and microstructure of interfacial regions among mortar/rock, and fiber/matrix were examined utilizing SEM. Computer image analysis performed along a perpendicular to the interface revealed compositional and physical irregularities. The variations in the volume of pores adjacent to interface zones are documented and supported by microscopic observation. The influences of interfacial properties on concrete composite strength and durability are discussed, and influences of fibers on the fracture and fracture resistance behavior are also discussed. Analyses of debonding along interfaces are used to define the role of debonding in fiber-reinforced concrete composites.

Research and Applying Evolution of High Efficient Water-Reducing Agent for High Performance Concrete

2012 ◽  
Vol 610-613 ◽  
pp. 573-576
Author(s):  
Zheng Jun Wang ◽  
Jia Bin Liang
Keyword(s):  
High Performance ◽  
Lightweight Concrete ◽  
High Performance Concrete ◽  
Concrete Strength ◽  
High Strength ◽  
Reducing Agent ◽  
Mass Concrete ◽  
Green Concrete ◽  
High Efficient ◽  
Strength And Durability

This paper discusses the development of water-reducing agent and the present situation of the application of high performance concrete. The traditional concrete will be substituted by high performance concrete, green concrete. In the course of appearance of high performance and green, concrete admixtures plays an extremely important role. Concrete water-reducing agent is admixture of the main part. In the case of keeping liquidity, it can make water consumption reduce, so the concrete strength and durability can be improved. It is applicable to all kinds of industrial and civil construction engineering, and it can be applied to different strength grade of concrete. It has important significance for mass concrete engineering, marine building facilities, and component and product of high strength lightweight concrete.

scholarly journals Characteristics of Recycled Polypropylene Fibers as an Addition to Concrete Fabrication Based on Portland Cement

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1827 ◽  
Author(s):  
Marcin Małek ◽  
Mateusz Jackowski ◽  
Waldemar Łasica ◽  
Marta Kadela
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
High Performance ◽  
High Performance Concrete ◽  
Polypropylene Fiber ◽  
Fiber Reinforced Concrete ◽  
Polypropylene Fibers ◽  
Split Tensile Strength ◽  
Recycled Polypropylene ◽  
Recycled Fibers

High-performance concrete has low tensile strength and brittle failure. In order to improve these properties of unreinforced concrete, the effects of adding recycled polypropylene fibers on the mechanical properties of concrete were investigated. The polypropylene fibers used were made from recycled plastic packaging for environmental reasons (long degradation time). The compressive, flexural and split tensile strengths after 1, 7, 14 and 28 days were tested. Moreover, the initial and final binding times were determined. This experimental work has included three different contents (0.5, 1.0 and 1.5 wt.% of cement) for two types of recycled polypropylene fibers. The addition of fibers improves the properties of concrete. The highest values of mechanical properties were obtained for concrete with 1.0% of polypropylene fibers for each type of fiber. The obtained effect of an increase in mechanical properties with the addition of recycled fibers compared to unreinforced concrete is unexpected and unparalleled for polypropylene fiber-reinforced concrete (69.7% and 39.4% increase in compressive strength for green polypropylene fiber (PPG) and white polypropylene fiber (PPW) respectively, 276.0% and 162.4% increase in flexural strength for PPG and PPW respectively, and 269.4% and 254.2% increase in split tensile strength for PPG and PPW respectively).

Influence of Different Mechanical Properties to the Concrete Penetration Resistance

2014 ◽  
Vol 982 ◽  
pp. 119-124 ◽  
Author(s):  
Tomáš Vavřiník ◽  
Jan Zatloukal
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
High Speed ◽  
High Performance ◽  
High Performance Concrete ◽  
Penetration Resistance ◽  
Fiber Reinforced Concrete ◽  
Experimental Program ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete

This paper describes influence of different mechanical properties to the concrete penetration resistance. The resistance is evaluated on the basis of the presented experimental program. In the experiment, non-deformable ogive-nose projectiles with diameter of 7.92 mm and mass of 8 g with impact velocity of about 700 m/s were hitting center of the specimens. Determination of the concrete penetration resistance was than based on projectile residual velocity obtained from high-speed camera record. The specimens were made from high strength concrete, steel fiber-reinforced concrete, ultra-high performance concrete and ultra-high performance fiber-reinforced concrete with different fiber content. The concrete penetration resistance was evaluated on total 32 specimens. Influence of mechanical properties, addition of coarse aggregate and steel fibers were discussed. Mechanical properties of the tested materials were investigated on total 125 specimens. Data from the measurements were used for creation of new RHT concrete models in Autodyn. In order to confirm experiment's setup and results, numerical analysis was performed in Autodyn. Results of the numerical simulations were compared to the experimental program.

Development of Green High Performance Concrete

2013 ◽  
Vol 634-638 ◽  
pp. 2672-2675
Author(s):  
Zhen Rong Lin ◽  
Tao Zhang ◽  
Yun Yun Xu
Keyword(s):  
Mechanical Properties ◽  
High Strength Concrete ◽  
High Performance ◽  
Building Materials ◽  
High Performance Concrete ◽  
High Strength ◽  
Current Development ◽  
Green Concrete ◽  
The Past ◽  
Concrete Production

As the world's largest building materials production, the mechanical properties of concrete prominent and construction is simple, inexpensive features. Concrete production and construction sectors also exists a very serious problem of environmental pollution, people have to consider how to enhance the environmental protection of concrete, namely, the production and use of "green concrete". Since the past one-sided pursuit of high strength concrete, while ignoring the the durability issues brought a series of questions, allowing people to put forward the concept of a high-performance concrete. The paper by exploring the current development of high-performance green concrete, summary of the proposed method to achieve green high performance concrete.

scholarly journals Use of Waste from Granite Gang Saws to Manufacture Ultra-High Performance Concrete Reinforced with Steel Fibers

2021 ◽  
Vol 11 (4) ◽  
pp. 1764
Author(s):  
Fernando López Gayarre ◽  
Jesús Suárez González ◽  
Iñigo Lopez Boadella ◽  
Carlos López-Colina Pérez ◽  
Miguel Serrano López
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Elasticity Modulus ◽  
Steel Fiber ◽  
High Performance Concrete ◽  
Fiber Reinforced Concrete ◽  
Final Conclusion ◽  
Quartz Powder ◽  
Steel Fiber Reinforced Concrete ◽  
Ultra High Performance Concrete

The purpose of this study is to analyze the feasibility of using the ultra-fine waste coming from the granite cutting waste gang saws (GCW-GS) to manufacture ultra-high performance, steel-fiber reinforced concrete (UHPFRC). These machines cut granite blocks by abrasion using a steel blade and slurry containing fine steel grit. The waste generated by gang saws (GCW-GS) contains up to 15% Fe2O3 and up to 5% CaO. This is the main difference from the waste produced by diamond saws (GCW-D). Although this waste is available in large quantities, there are very few studies focused on recycling it to manufacture any kind of concrete. In this study, the replaced material was the micronized quartz powder of natural origin used in the manufacture of UHPRFC. The properties tested include workability, density, compressive strength, elasticity modulus, flexural strength, and tensile strength. The final conclusion is that this waste can be used to manufacture UHPFRC with a better performance than that from diamond saws given that there is an improvement of their mechanical properties up to a replacement of 35%. Even for higher percentages, the mechanical properties are within values close to those of control concrete with small decreases.

scholarly journals Mechanical Properties of Nano SiO2 and Carbon Fiber Reinforced Concrete after Exposure to High Temperatures

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3773 ◽  
Author(s):  
Linsong Wu ◽  
Zhenhui Lu ◽  
Chenglong Zhuang ◽  
Yu Chen ◽  
Ruihua Hu
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
High Temperature ◽  
Carbon Fiber ◽  
Fiber Reinforced Concrete ◽  
Experimental Result ◽  
Fiber Reinforced ◽  
Nano Sio2 ◽  
Residual Properties ◽  
Carbon Fiber Reinforced

This study presents the key mechanical and residual properties after high-temperature of different Nano SiO2 carbon fiber-reinforced concrete (NSCFRC) mixtures. A total of seven NSCFRC mixtures incorporating 0%–0.35% of carbon fiber by volume of concrete and 0%–2% Nano SiO2 by weight of the binder were studied. The key mechanical properties such as compressive strength, tensile strength, and flexural strength of NSCFRC with 0.25% carbon fiber and 1% NS were 6.8%, 20.3%, and 11.7% higher than PC (0% CFs, 0% NS), respectively. Scanning Electron Microscopy (SEM) shows that Nano SiO2 reduced the internal porosity and increased the compactness of the concrete matrix. Furthermore, the experimental result demonstrates that NSCFRC can improve the mechanical properties of concrete after high-temperature and equations were obtained to describe the evolution of residual properties at elevated temperatures. Results suggested that the effect of carbon fibers on the residual properties of concrete after high-temperature is less than steel fiber and polypropylene fiber. It was also indicated that adding appropriate Nano SiO2 to concrete is an effective means to improve the residual performance after high-temperature.

scholarly journals Influence of Nanoparticles from Waste Materials on Mechanical Properties, Durability and Microstructure of UHPC

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4530 ◽  
Author(s):  
Sahar A. Mostafa ◽  
Ahmed S. Faried ◽  
Ahmed A. Farghali ◽  
Mohamed M. EL-Deeb ◽  
Taher A. Tawfik ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rice Husk ◽  
High Performance ◽  
Rice Husk Ash ◽  
High Performance Concrete ◽  
Waste Materials ◽  
Nano Silica ◽  
Ultra High Performance Concrete ◽  
X Ray

This investigation presents the influence of various types of nanoparticles on the performance of ultra high performance concrete (UHPC). Three nanoparticles from waste materials include nano-crushed glass, nano-metakaolin, nano-rice husk ash were prepared using the milling technique. In addition, nano-silica prepared using chemical method at the laboratory is implemented to compare the performance. Several UHPC mixes incorporating different dosages of nanoparticles up to 5% are prepared and tested. Mechanical properties, durability as well as the microstructure of UHPC mixes have been evaluated in order to study the influence of nanoparticles on the hardened characteristics of UHPC. The experimental results showed that early strength is increased by the incorporation of nanomaterials, as compared to the reference UHPC mix. The incorporation of 3% nano-rice husk ash produced the highest compressive strength at 91 day. Microstructural measurements using Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDX), and Thermogravimetric Analysis (TGA) confirm the role of nanomaterials in densifying the microstructure, reducing calcium hydroxide content as well as producing more C-S-H, which improves the strength and reduces the absorption of UHPC. Nanoparticles prepared from waste materials by the milling technique are comparable to chemically prepared nanosilica in improving mechanical properties, refining the microstructure and reducing the absorption of UHPC.

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