Reinforcing effects of carbon nanotubes on cement-based grouting materials under dynamic impact loading

Li, Guangzhi; Shi, Xinshuai; Gao, Yuan; Ning, Jianguo; Chen, Weiqiang; Wei, Xingchen; Wang, Jun; Shang, Yang

doi:10.1016/j.conbuildmat.2023.131083

Cited by 17 publications

(5 citation statements)

References 44 publications

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“…However, dynamic impact loads often occur in engineering, viscoelastic damping materials and concrete composed of constrained damping structure has a very good vibration damping effect, but this vibration damping method of construction requirements are high, so it is not suitable for large-scale application in construction projects, but the combination of viscoelastic damping materials and silica SF to form a filler, which can be used to improve the vibration damping performance of cementitious materials, and the research on the reinforcing effect of SF and PUU on cementitious composites in the dynamic impact loading is relatively small. [22]. In this study, heterogeneous stepwise addition polymerization (polymerization reactions carried out in non-homogeneous systems.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of silica fume@polyure-thane urea cement composites

Feng,

Xu,

Cheng

et al. 2024

Mater. Res. Express

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In this study, a new material was synthesized by compounding silica fume and polyurethane urea, which is used to evaculate the vibration reduction performance of concrete. The mechanical and damping properties of silica fume@ polyurethane urea (SF@PUU) reinforced cement paste were investigated. Also, FT-IR, XRD, TG analysis, and SEM are included.The results indicated that SF@PUU leads to the production of high damping ratio cement pastes. The damping capacities of SF@PUU cement composites, where the damping mechanism included internal, external, and multiphase friction within the cement matrix. Additionally, SF@PUU created a constrained-layer damping structure in cement paste to improve the damping properties. The review confirmed that SF@PUU subjected to proper treatments can be as the replacement to cement in concrete or as a damping filler. However, more investigation is required into the dimensional stability and durability of SF@PUU-based concrete.

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Section: Introductionmentioning

confidence: 99%

Preparation and properties of silica fume@polyure-thane urea cement composites

Feng,

Xu,

Cheng

et al. 2024

Mater. Res. Express

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“…(a) (b) With the aim of enhancing the toughness and durability of concrete, endeavors have been undertaken to augment concrete through the incorporation of unconventional materials, including fibers [13][14][15], rubber particles [16][17][18], carbon nanotubes [19][20][21][22], and ceramics [23][24][25]. Several studies have demonstrated that the addition of steel fibers can substantially enhance the strength and toughness of the concrete matrix [26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Research and Development of Steel Fiber Reinforced Concrete Filling Material and Its Application in Gob-Side Entry Retaining Technology in Deep Mines

Zhang,

Shi,

et al. 2024

Buildings

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Against the background of the prevailing green development paradigm, numerous coal mines have embraced the adoption of gob-side entry retaining mining technology. The most commonly employed form of gob-side entry retaining involves building an artificial wall along the edge of the goaf behind the working face to maintain the roadway. The pivotal challenge in gob-side entry retaining lies in the roadside support. Currently, commonplace concrete serves as the predominant material for the roadside filling body. Nevertheless, traditional concrete exhibits drawbacks, including inadequate tensile strength and poor toughness, leading to wall cracks or even collapses in the retaining wall. Steel fiber, a frequently employed reinforcement and toughening agent in concrete, has found widespread application in the construction sector and other fields. However, its use as a roadside filling material in underground coal mines remains infrequent. Therefore, in this paper, the flow and mechanical properties of steel fiber concrete were tested and analyzed, and field industrial tests were conducted. Results of indoor experiments show that steel fibers reduce the slump of concrete. The addition of steel fibers shifted the pore compacting stage, linear elasticity stage, and destabilization stage forward and improved the post-peak bearing capacity. The addition of steel fibers makes the concrete compressive and tensile strength show a “first increase and then decrease” trend; both peaked at 1.5%, and the increase in tensile strength is more pronounced. Steel fibers enhance the strength of compressive strength of concrete at an early age, weaker at a late age, and tensile strength inversely. The addition of steel fiber can change the concrete matrix from tensile damage to shear damage, and the toughness index shows the trend of “first increase and then decrease”, and reaches the peak value when the dosage is 1.5%. Industrial test results show that steel fiber concrete as a roadside filling body can reduce the surrounding rock surface displacement and bolt (cable) force.

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“…The addition of nanotubes to cement improves the barrier to formation gas migration through cemented annulus. In the article [13], studies were carried out to study the effect of CNTs on cement-based materials under dynamic shock loading. It has been established that the impact resistance of backfill materials based on cement with CNTs was more significant at high dynamic load, the dynamic properties increase up to 31.86%.…”

Section: Introductionmentioning

confidence: 99%

Study of properties of cements and concrete mixtures with carbon nanotubes

Kozlova,

Zemskova,

Skopova

et al. 2023

E3S Web Conf.

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The development of nanotechnology contributes to the production of a new generation of multifunctional building materials. Carbon nanotubes (CNTs) are one of the components that make it possible to obtain such materials. CNTs are so small that they are prone to aggregation. To exclude this phenomenon, it is necessary to subject the particles to ultrasonic dispersion and stabilization. The purpose of the study was determined, which is to stabilize CNT suspensions and study of the properties of cements and concrete mixtures containing stabilized CNT particles in their composition. During the research, we have established the optimal dispersion parameters (t = 25±2 °C, υ = 44 kHz, τ<30 min) and the stabilizer concentration (5 g/l). The tests on the compressive strength of modified cement samples showed that the complex additive, which includes polycarboxylates and CNTs, gives the maximum increase in strength in the first day by 60%, in 28 days - by 20%. The introduction of CNTs into the composition of the concrete mix increased the compressive strength by 32% on the 3rd day of hardening, and by 34-39% on the 28th day compared to the control composition without additives.

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Reinforcing effects of carbon nanotubes on cement-based grouting materials under dynamic impact loading

Cited by 17 publications

References 44 publications

Preparation and properties of silica fume@polyure-thane urea cement composites

Preparation and properties of silica fume@polyure-thane urea cement composites

Research and Development of Steel Fiber Reinforced Concrete Filling Material and Its Application in Gob-Side Entry Retaining Technology in Deep Mines

Study of properties of cements and concrete mixtures with carbon nanotubes

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