scholarly journals Enhancing the Hardened Properties of Recycled Concrete (RC) through Synergistic Incorporation of Fiber Reinforcement and Silica Fume

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4112 ◽  
Author(s):  
Babar Ali ◽  
Hawreen Ahmed ◽  
Liaqat Ali Qureshi ◽  
Rawaz Kurda ◽  
Hisham Hafez ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Silica Fume ◽  
High Performance ◽  
Synergistic Effects ◽  
Fiber Reinforcement ◽  
Recycled Concrete ◽  
Mineral Admixture ◽  
Portland Cement Concrete ◽  
Positive Role ◽  
Hardened Properties

Portland cement concrete is fragile in tension and it has numerous negative impacts on the environment. To deal with these issues, both fiber reinforcement and recycled materials can be utilized to manufacture sustainable and ductile concrete. In this study, the synergistic effects of high-performance mineral admixture silica fume and glass fiber reinforcement were investigated on the hardened properties of RC. For this purpose, two concrete mix families, namely, NC and RC were prepared. To understand the benefits of synergistic utilization of glass fiber and silica fume, in both NC and RC, 0.5% glass fiber was incorporated with three different levels of silica fume. i.e., 0%, 5%, and 10%. Both strength and permeability-related durability properties were investigated. Results revealed that combined incorporation of 0.5% fiber and 10% silica fume can help in the production of RC having better mechanical and durability performance compared to reference “NC”. Simultaneous incorporation of silica fume and glass fiber produces a combined effect greater than their individual effects on both mechanical and permeability properties of concrete. Silica fume plays a very dominant and positive role in the development of CS, WA, and CIPR of RC, whereas glass fiber plays a vital role in upgrading STS and FS of RC and whereas, with the addition of 0.5% glass fiber, RC can yield 8–9 times higher flexural toughness than that of the plain NC.

Influence of Mixing Method of Mineral Admixture on Performance of Recycled Concrete

2012 ◽  
Vol 598 ◽  
pp. 612-617 ◽  
Author(s):  
Ying Li ◽  
Da Hu Dai
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
Recycled Concrete ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Mixing Method

In order to improve the microstructure of recycled concrete, the mineral admixtures were mixed into recycled concrete by different mixing method in this paper. It is demonstrated that the early compressive strength of recycled concrete decreased when mixed by fly ash only, but its later strength increasing rate is higher than recycled concrete without fly ash. When mixed fly ash and silica fume in the recycled concrete, the compressive strength of recycled concrete with fly ash and silica fume is higher than the strength of recycled concrete with fly ash only, and its microstructure tend to be dense.

Literature Review: Mechanical Properties of Hardened Silica Fume Concrete

2014 ◽  
Vol 1008-1009 ◽  
pp. 1357-1362
Author(s):  
Xi Xi He ◽  
Qing Wang
Keyword(s):  
Silica Fume ◽  
High Performance ◽  
High Performance Concrete ◽  
Chloride Ion ◽  
High Strength ◽  
Penetration Resistance ◽  
Pozzolanic Reaction ◽  
Mineral Admixture ◽  
Chemical Attack ◽  
Chloride Ion Penetration

Silica fume (SF) has become an environmental mineral admixture in the production of high-strength and high-performance concrete in modern concrete engineering. Through compacting all components and pozzolanic reaction, obvious mechanical enhancement of concrete is observed in the aspects of compressive strength tensile strength, elastic modulus as well as fracture toughness. Further more, durability improvement of silica fume concrete such as chloride-ion penetration resistance and chemical attack resistance are reported accordingly.

Experimental Study on Frost Resistance Durability of Concrete with Intensified Recycled Aggregates

2011 ◽  
Vol 280 ◽  
pp. 152-158 ◽  
Author(s):  
Wen Ge Chai ◽  
Wen Li Li ◽  
Wen Xia Gao
Keyword(s):  
High Performance ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Recycled Concrete ◽  
Mineral Admixture ◽  
Recycled Aggregates ◽  
High Quality ◽  
Freeze Thaw ◽  
High Efficient ◽  
Resistance Durability

In order to study high performance recycled concrete, the recycled concrete is prepared through the double admixing technology, i.e. mixing of high-quality mineral admixture and high-efficient water reducer. It is modified with the recycled aggregates soaked in and intensified by chemical grouts. The mass loss rate and relative dynamic elastic modulus of the recycled concrete are measured through fast freeze-thaw test, and a model for predicting the life of the recycled concrete under freeze-thaw conditions is built. The experiment results show that it is an efficient way to intensify recycled aggregates through being soaked in chemical grouts. The recycled concrete prepared with recycled aggregates intensified by chemical grouts, high-quality mineral admixture and the high-efficient water reducer feature favorable frost-resistance.

Strength Studies of High Performance Concrete with Fly-Ash and Gangue

2012 ◽  
Vol 446-449 ◽  
pp. 3544-3553
Author(s):  
Yun Fang Meng ◽  
Ya Yun Tan ◽  
Rui Li
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Silica Fume ◽  
High Performance ◽  
High Performance Concrete ◽  
Supplementary Cementitious Materials ◽  
Optimum Level ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
And Performance

The main purpose of this research was to enhance the strength and durability of concrete in both design and construction of high performance concrete. Particularly, the strength in high performance concrete is achieved by optimising the gangue, fly ash and silica fume replacement for cement. The gangue has been used as a cementitious material. Using data from tests on laboratory studies, comparisons are made of the properties and performance of the gangue, fly ash and silica fume concrete with conventional Portland cement concrete of similar and same mixture proportions. The many technical benefits available to high performance concrete user, such as reduced heat evolution, lower permeability and higher strength at later ages, at the same time, in order to increase resistance to sulphate attack and alkali silica reaction. A number of recommendations are given for the effective use of gangue and fly ash in high performance concrete. The results show that 10% gangue, 15% slag, 15% fly ash, 10% silica fume of replacement was found to be an optimum level and demonstrated excellent performance in strength. Literature review on the use of different supplementary cementitious materials in concrete to enhance strength was also reported. The paper is intended to provide guidance for those concerned with the design, application and performance of high properties concrete in practice where gangue and fly ash can also help to reduce costs and energy demands in the production of concrete compared with conventional Portland cement concrete.

Impact of Composite Mineral Admixture on Carbonization Resistance of High Performance Concrete

2015 ◽  
Vol 1095 ◽  
pp. 248-253 ◽  
Author(s):  
Yuan Gang Wang ◽  
Peng Ma ◽  
Kai Jian Huang ◽  
Gao Qin Zhang ◽  
Ya Feng Hu
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
High Performance ◽  
High Performance Concrete ◽  
Steel Slag ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Test Results ◽  
Ternary Composite ◽  
Resistance Property

Fly ash, silica fume and ground steel slag are chosen to make up composite mineral admixtures. Through the orthogonal test, carbonization resistance property of High Performance Concrete (HPC) mixed with composite mineral admixtures is studied. Test results show that the carbonization resistance property of HPC can be improved with defined amount of composite mineral admixture mixed, in addition, the effect of ternary composite admixture of ground steel slag, fly ash and silica fume is more obvious than that of binary composite admixture.

Effect of Fiber-Reinforcement Material on the Leakage Failure in Polymer Composite Pressure Piping

2008 ◽  
Author(s):  
Pierre Mertiny ◽  
Kulvinder Juss
Keyword(s):  
Glass Fiber ◽  
Polymer Composite ◽  
High Performance ◽  
Low Cost ◽  
Fiber Reinforcement ◽  
Fiber Material ◽  
Reinforced Polymer ◽  
Wide Availability ◽  
Fiber Materials ◽  
Leakage Failure

Fiber-reinforced polymer composite piping has traditionally been produced using E-glass fiber materials. E-glass has been the preferred reinforcement phase due to its good corrosion resistance, low cost and wide availability. However, in recent years other materials have emerged on the market, or are becoming competitive in price. Mineral based basalt fibers and high-performance S-glass are examples of such materials. In the present study the performance of basalt and S-glass reinforcements was investigated in comparison to a commonly used advanced E-glass fiber material. Employing the same epoxy matrix phase, specimens from the various fiber materials were produced, and their leakage behavior was assessed using experimental means. It was observed that the type of fiber reinforcement had limited effect on leakage behavior of pressure-retaining pipe structures.

scholarly journals Rheological Behavior of High-Performance Shotcrete Mixtures Containing Colloidal Silica and Silica Fume Using the Bingham Model

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 428
Author(s):  
Kyong Ku Yun ◽  
Jong Beom Kim ◽  
Chang Seok Song ◽  
Mohammad Shakhawat Hossain ◽  
Seungyeon Han
Keyword(s):  
Silica Fume ◽  
High Performance ◽  
Colloidal Silica ◽  
Graphical Analysis ◽  
Mineral Admixture ◽  
Rheological Parameters ◽  
Bingham Model ◽  
New Material ◽  
The Cost ◽  
Strength And Durability

There have been numerous studies on shotcrete based on strength and durability. However, few studies have been conducted on rheological characteristics, which are very important parameters for evaluating the pumpability and shootability of shotcrete. In those studies, silica fume has been generally used as a mineral admixture to simultaneously enhance the strength, durability, pumpability, and shootability of shotcrete. Silica fume is well-known to significantly increase the viscosity of a mixture and to prevent material sliding at the receiving surface when used in shotcrete mixtures. However, the use of silica fume in shotcrete increases the possibility of plastic shrinkage cracking owing to its very high fineness, and further, silica fume increases the cost of manufacturing the shotcrete mixture because of its cost and handling. Colloidal silica is a new material in which nano-silica is dispersed in water, and it could solve the above-mentioned problems. The purpose of this research is to develop high-performance shotcrete with appropriate levels of strength and workability as well as use colloidal silica for normal structures without a tunnel structure. Thereafter, the workability of shotcrete with colloidal silica (2, 3, and 4%) was evaluated with a particle size of 10 nm and silica fume replacement (4 and 7%) of cement. In this study, an air-entraining agent for producing high-performance shotcrete was also used. The rheological properties of fresh shotcrete mixtures were estimated using an ICAR rheometer and the measured rheological parameters such as flow resistance and torque viscosity were correlated with the workability and shootability. More appropriate results will be focusing on the Bingham model properties such that the main focus here is to compare all data using the Bingham model and its performance. The pumpability, shootability, and build-up thickness characteristics were also evaluated for the performance of the shotcrete. This research mainly focuses on the Bingham model for absolute value because it creates an exact linear line in a graphical analysis, which provides more appropriate results for measuring the shotcrete performance rather than ICAR rheometer relative data.

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