Research Progress on Carbon Nanotubes Reinforced Cement-Based Materials

2014 ◽  
Vol 629-630 ◽  
pp. 487-493
Author(s):  
Bao Min Wang ◽  
Shuai Liu ◽  
Yu Han
Keyword(s):  
Carbon Nanotubes ◽  
High Performance ◽  
Weight Fraction ◽  
Research Field ◽  
Research Progress ◽  
Cement Matrix ◽  
Cement Composites ◽  
Mechanical Stirring ◽  
Cement Based Materials ◽  
Reinforced Cement

For their remarkable properties, carbon nanotubes (CNTs) are considered as promising candidate for next generation of high performance and functional cement-based composites in 21st century. The paper focuses on the dispersibility, mechanical property, durability, conductivity and piezoresistivity properties of CNTs reinforced cement-based materials. A homogenous CNTs-suspension was obtained using the method which combined ultrasonic processing with mechanical stirring, electric-field introduction and surfactant decoration. The low weight fraction of CNTs improved the mechanical properties of CNTs/cement composites. The compressive strength and toughness were correspondingly improved. The added CNTs improved the sulfate attack resistance and impermeability properties of the prepared CNTs/cement mixes. Meanwhile, the added CNTs improved the pressure-sensitive, conductivity and electromagnetic absorption properties of the prepared mixes, which laid a foundation of multi-functional concrete and structure. It concludes that the key issue for CNTs/cement composites is the dispersibility and the compatibility of CNTs in cement matrix. The solving solutions are put forward. In the meantime, the further research prospects in this research field are forecasted.

Research Progress of Fiber Reinforced Cement Composites

2012 ◽  
Vol 457-458 ◽  
pp. 549-552
Author(s):  
Xue Jian Shi ◽  
Xiao Qing Wu
Keyword(s):  
Fiber Type ◽  
Research Progress ◽  
Cementitious Composites ◽  
Cement Composites ◽  
Fiber Reinforced ◽  
Cement Based Materials ◽  
Reinforced Cement ◽  
Fiber Reinforced Cementitious Composites

Based on the importantce of component of cement-based composites, introduced the fiber reinforced cementitious composites in fiber type and cement-based materials and the main types of filler, and their effect on the interface between the fiber and the cement.

Using Acoustic Emission to Quantify Damage in High-Performance Fiber-Reinforced Cement Composites under Cyclically Compressive Loading

2010 ◽  
Vol 163-167 ◽  
pp. 2549-2552
Author(s):  
Sang Hyun Nam ◽  
Young Jae Song ◽  
Sun Woo Kim ◽  
Hyun Do Yun
Keyword(s):  
Acoustic Emission ◽  
High Performance ◽  
Compressive Load ◽  
Cement Matrix ◽  
Multiple Cracks ◽  
Cement Composites ◽  
Fiber Reinforced ◽  
Kaiser Effect ◽  
High Performance Fiber ◽  
Reinforced Cement

High performance fiber-reinforced cement composites (HPFRCCs) show multiple cracks and a limited damage tolerance capability due to the debonding of the fibers of the cement matrix. For practical applications, it is necessary to investigate the fractural behavior of HPFRCCs to understand the mechanism of the microbehavior of a cement matrix containing reinforcing fibers. We have investigated the acoustic emission (AE) signals in HPFRCCs under monotonic and cyclic uniaxial compressive loads. Four types of specimen were tested. The experimental parameters studied were: the type of fiber (polyethylene or polyvinyl alcohol), the hybrid type (with steel cord), and the loading pattern. The data shows that the progress of the damage in HPFRCCs in the compressive mode is characteristic of the type of hybrid fiber and its volume fraction. From the AE data, the second and third compressive load cycles resulted in a successive decrease in the amplitude compared to the first compressive load cycle. In addition, an AE Kaiser effect was observed in HPFRCCs specimens up to 80% of their ultimate strength. These observations suggest that the AE Kaiser effect has potential for use as a new tool to monitor the loading history of HPFRCCs.

scholarly journals Electrical, Piezoresistive and Electromagnetic Properties of Graphene Reinforced Cement Composites: A Review

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3220
Author(s):  
Shengchang Mu ◽  
Jianguang Yue ◽  
Yu Wang ◽  
Chuang Feng
Keyword(s):  
Material Properties ◽  
High Performance ◽  
Cement Composite ◽  
Electromagnetic Properties ◽  
Cement Matrix ◽  
Future Research ◽  
Cement Composites ◽  
Preparation Methods ◽  
Reinforced Cement ◽  
Filler Dispersion

Due to their excellent combination of mechanical and physical properties, graphene and its derivatives as reinforcements have been drawing tremendous attention to the development of high-performance and multifunctional cement-based composites. This paper is mainly focused on reviewing existing studies on the three material properties (electrical, piezoresistive and electromagnetic) correlated to the multifunction of graphene reinforced cement composite materials (GRCCMs). Graphene fillers have demonstrated better reinforcing effects on the three material properties involved when compared to the other fillers, such as carbon fiber (CF), carbon nanotube (CNT) and glass fiber (GF). This can be attributed to the large specific surface area of graphene fillers, leading to improved hydration process, microstructures and interactions between the fillers and the cement matrix in the composites. Therefore, studies on using some widely adopted methods/techniques to characterize and investigate the hydration and microstructures of GRCCMs are reviewed and discussed. Since the types of graphene fillers and cement matrices and the preparation methods affect the filler dispersion and material properties, studies on these aspects are also briefly summarized and discussed. Based on the review, some challenges and research gaps for future research are identified. This review is envisaged to provide a comprehensive literature review and more insightful perspectives for research on developing multifunctional GRCCMs.

Preliminary Study on VGCF Reinforced Cement Composites

2010 ◽  
Vol 97-101 ◽  
pp. 1641-1644
Author(s):  
Jun Yu ◽  
Bing She Xu
Keyword(s):  
Compressive Strength ◽  
Chemical Vapor ◽  
Weight Fraction ◽  
Fiber Content ◽  
Cement Matrix ◽  
Cement Composites ◽  
Matrix Composites ◽  
Reinforced Cement ◽  
Preliminary Study ◽  
And Performance

Preliminary study on the preparation and performance of vapor grown carbon fibers (VGCF) reinforced cement composites was carried out. VGCF were prepared from de-oiled asphalt (DOA) by chemical vapor deposition (CVD). Results demonstrated that compressive strength and electrical conductivity of VGCF reinforced cement could be significantly enhanced with very low fiber content. The resistivity decreased and compressive strength increased of cement-matrix composites with weight fraction of VGCF increasing from 0 to 0.6% fiber in the paste. The fiber content of 0.4% by mass of cement was recommended, which yielded the resistivity of 1.49×103Ωcm. That was two orders of magnitude lower than that for the same paste without VGCF (3.25×105Ωcm). Furthermore, the compressive strength increased by 28.8% as the VGCF content increases from 0 to 0.4% by mass of cement.

scholarly journals Development of high performance fiber reinforced cement composites (HPFRCC) for application as a transition layer of reinforced beams

2014 ◽  
Vol 7 (6) ◽  
pp. 965-975 ◽  
Author(s):  
V. J. Ferrari ◽  
A. P. Arquez ◽  
J. B. de Hanai ◽  
R. A. de Souza
Keyword(s):  
Transition Layer ◽  
High Performance ◽  
Stress Transfer ◽  
Fiber Reinforced Polymers ◽  
Cement Matrix ◽  
Cement Composites ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Polymers ◽  
High Performance Fiber ◽  
Reinforced Cement

This study presents the development and behavior analysis of high performance fiber reinforced cement composites (HPFRCC). The describedmaterials were specifically developed for application as a transition layer: a repair layer that constitutes the stressed chord of reinforcedconcrete beams strengthened in flexure with carbon fiber reinforced polymers (CFRP). Nineteen different composites were produced by thehybridization process, varying the conventional short steel fiber and steel microfiber (manufactured exclusively for this research) contentsto modify the microstructure of the material, thus enhancing the stress transfer process from the cement matrix to the fibers. To analyze theresponse to flexural loading, the composites underwent three point bending tests in notched prism specimens. The response of the materialwas obtained considering strength and tenacity parameters (flexural and fracture). There was evidence of high performance by the composites with a pseudo-hardening behavior.

Seismic Behavior of Slender HPFRCC Coupling Beams with Limited Transverse Bars

2018 ◽  
Vol 34 (1) ◽  
pp. 77-98 ◽  
Author(s):  
Sang Whan Han ◽  
Jin Wook Kang ◽  
Chang Seok Lee
Keyword(s):  
Seismic Behavior ◽  
High Performance ◽  
American Concrete Institute ◽  
Transverse Reinforcement ◽  
Cement Composites ◽  
Coupling Beams ◽  
Conventional Concrete ◽  
Drift Capacity ◽  
High Performance Fiber ◽  
Reinforced Cement

The objective of this study was to investigate the seismic behavior of slender concrete diagonally-reinforced coupling beams (DRCBs) with an aspect ratio of 3.5 and to explore the possibility of alleviating the reinforcement detail for DRCBs using high-performance fiber-reinforced cement composites (HPFRCCs). For this purpose, slender HPFRCCs and conventional concrete DRCBs with transverse reinforcement spacing of 110 mm, 250 mm, and 500 mm were made and tested. One HPFRCC DRCB specimen was made without transverse reinforcement for comparison purposes. This experimental study shows that the slender HPFRRCC DRCBs with transverse reinforcement spacing of 250 mm have almost the same strength and drift capacity as those of the conventional concrete DRCB with transverse reinforcement spacing of 110 mm, satisfying the requirement of American Concrete Institute ACI 318-14 (2014) building code.

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