Early-Age Hydration Reaction and Strength Formation Mechanism of Solid Waste Silica Fume Modified Concrete

Luo, Tao; Chen, Hua; Sun, Qiang; Tang, Liyun; Yu, Yan; Pan, Xiaofeng

doi:10.3390/molecules26185663

Cited by 11 publications

(4 citation statements)

References 35 publications

(33 reference statements)

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“…The aim was to evaluate the influence of both CNTs and CMFs together with silica fume into the mortar specimens with respect to their mechanical and piezoresistive properties. Silica fume which was selected to be incorporated into the mortar specimens, improved the mechanical properties of the mortar due to the increase of the secondary hydrated reactions with Ca(OH)2 resulting to the formation of C-S-H gel [18,20,33]. The chosen concentration of CMF for the fabrication of CNT/CMFreinforced mortar specimens was 0.4% bwoc (Table 4) because the Mortar-0.4% CMF specimen demonstrated the best flexural strength value of all the CMF-reinforced mortar specimens (as it is discussed in detail in section 3.2.…”

Section: Synthesis Of Reinforced Mortarsmentioning

confidence: 99%

The Effect of Carbon Nanotubes and Carbon Micro Fibers on the Piezoresistive and Mechanical Properties of Mortar

Kanellopoulou,

Kartsonakis,

Karaxi

et al. 2024

Preprint

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In this study, the mechanical and piezoresistive properties of mortars reinforced with carbon nanotubes (CNTs) and carbon micro fibers (CMFs) are determined. Silica fume as well as a polymer with polyalkylene glycol graft chains were used as dispersant agents for the CNTs and CMFs incorporation into the cement paste. The mechanical properties of the mortar composites were investigated in respect to their flexural and compressive strength. A four-probe method was used for the estimation of their piezoresistive response. The test outcomes revealed that the combination of the dispersant agents along with a low content of CNTs and CMF by weight of cement (bwoc) result in the production of a stronger mortar with enhanced mechanical performance and durability. More specifically, there was an increase in flexural and compressive strength up to 38% and 88%, respectively. Moreover, the piezoresistive response of the reinforced cementitious materials was attributed to the variation of electrical resistivity due to tunneling transport of electrons stemming from two different mechanisms due to the incorporation of the conductive admixtures (CNTs and CMF). This work aims to contribute to the progress acceleration in the field of developing structural materials with self-sensing and electrical actuation related properties.

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Section: Synthesis Of Reinforced Mortarsmentioning

confidence: 99%

The Effect of Carbon Nanotubes and Carbon Micro Fibers on the Piezoresistive and Mechanical Properties of Mortar

Kanellopoulou,

Kartsonakis,

Karaxi

et al. 2024

Preprint

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“…Numerous oriented Ca(OH) 2 crystals exist in the aggregate-matrix interface, and the large Ca(OH) 2 crystals parallel to aggregate surface are prone to cracking, resulting in the formation of weak regions of strength. A hydration reaction is the premise of the pozzolanic reaction, moreover, the pozzolanic reaction eliminates the negative effect of the hydration reaction and provides a guarantee for the strength of concrete [61][62][63][64]. As GT dosage arrives at different values, the adhesion of cementitious material to aggregate will be affected.…”

Section: Analysis Of Reaction Mechanism Of Cementitious Materialsmentioning

confidence: 99%

“…At Stage 4 and Stage 5, C-S-H tended to fill the entire slurry and combined with the GT-sand system to form a concrete structure (Figure 23d,e). the premise of the pozzolanic reaction, moreover, the pozzolanic reaction eliminates the negative effect of the hydration reaction and provides a guarantee for the strength of concrete [61][62][63][64]. As GT dosage arrives at different values, the adhesion of cementitious material to aggregate will be affected.…”

Section: Analysis Of Reaction Mechanism Of Cementitious Materialsmentioning

confidence: 99%

Mechanical Properties and Mechanism Analysis of Graphite Tailings Environment-Friendly Concrete

Duan

Liu

et al. 2022

Materials

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The development of tailings in concrete technology is not only conducive to the realization of the goal of reducing carbon emissions, but also conducive to the inhibition the occurrence of shortages of sand and gravel supplies. In this study, graphite tailings were used to replace sand in the range of 0~100%, and the mechanical mechanism of graphite tailings concrete was examined through compressive and flexural tests. The mechanical experimental results were evaluated and verified based on concrete macroscopic failure appearance, mesoscopic failure appearance, and physical characteristics of graphite tailings. The results revealed that the concrete strength increases first and then decreases with the increase of the graphite tailings content. Compared to GT00 (GT00 is a specimen with a graphite tailings content of 0%, and so on), GT10~GT60 exhibited better mechanical properties, of which 30% was recommended as the optimal replacement rate. The mechanical properties of GT10 and GT20 had an upward trend, and GT30 had low spalling, with aggregate fragmentation found on the fracture surface. GT30 showed the best resistance to bending and deformation. The mechanical properties of GT40~GT60 had a downward trend. When the graphite tailings content was higher than 70%, the interface defects of the aggregate matrix increased, thus making it easier for cracks to propagate along the interface. Furthermore, the mechanism of graphite tailings replacing sand verified the test results from different perspectives, which provides new analysis ideas for other tailings in environment-friendly concrete.

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“…Physically bound water is water adsorbed at the surfaces of gel pores. In the hardening process of concrete, cement hydration consumes part of the physically bound water, thereby generating chemically bound water [3]. The dehydration temperature of free water and part of physically bound water is the same as the evaporation temperature of bulk water, so the amount of these water can be evaluated by comparing the mass before and after drying at 105 • C [4,5].…”

Section: Introductionmentioning

confidence: 99%

Nondestructive observation of state of water in concrete using dielectric spectroscopy

Sudo,

Sato,

Kurihara

et al. 2023

Meas. Sci. Technol.

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We present a method of observing the relaxation process reflecting the motion of water molecules masked by the contribution of electrical conduction. By using this method, we can observe the Cole−Cole-type relaxation process reflecting the motion of the bound water molecules in cement-based materials. The relaxation time and strength of this process increase with curing time, and both parameters saturate to a constant value. The curing time dependence of compressive strength can be described by a logarithmic function, and the change in compressive strength correlates strongly with the change in relaxation time. In the analysis using the τ-βCC diagram, the trajectory of the τ-βCC diagram shifts to the lower right as the curing progresses, and the feature of the trajectory of the τ-βCC diagram depends on the difference in the wetting environment. Our results indicate that the state of water retained in the pore structure can be used as a probe to obtain information on the curing progress of concrete.

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Early-Age Hydration Reaction and Strength Formation Mechanism of Solid Waste Silica Fume Modified Concrete

Cited by 11 publications

References 35 publications

The Effect of Carbon Nanotubes and Carbon Micro Fibers on the Piezoresistive and Mechanical Properties of Mortar

The Effect of Carbon Nanotubes and Carbon Micro Fibers on the Piezoresistive and Mechanical Properties of Mortar

Mechanical Properties and Mechanism Analysis of Graphite Tailings Environment-Friendly Concrete

Nondestructive observation of state of water in concrete using dielectric spectroscopy

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