Use of nano-SiO2 to develop a high performance green lightweight engineered cementitious composites containing fly ash cenospheres

Xi, Bin; Zhou, Yingwu; Yu, Kequan; Hu, Biao; Huang, Xiaoxu; Sui, Lili; Xing, Feng

doi:10.1016/j.jclepro.2020.121274

Cited by 79 publications

(9 citation statements)

References 41 publications

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“…The cumulative heat release results ( Figure 6 b) show that the cumulative heat release for specimens containing NS was substantially greater than that for Plain until 32 h of hydration. This is in agreement with the finding by Xi et al [ 65 ] that NS and SF particles accelerate hydration by acting as additional nucleation sites for cement hydrates during the initial stage of hydration. In particular, initial hydration was accelerated more strongly for NS05SF4 than for NS05 or NS15.…”

Section: Resultssupporting

confidence: 93%

“…As shown in Figure 7 , NS with nano-sized particles fills the pores between the cement particles during the initial hydration process, thereby causing the structural filler effect inside the cement. This can improve the density of the matrix by effectively refining capillary pores and decreasing the porosity of the matrix [ 65 ]. Pacheco-Torgal et al [ 67 ] reported that the addition of NS makes the internal structure of concrete mortar denser.…”

Section: Resultsmentioning

confidence: 99%

“…NS particles preferentially adsorb the C-S-H gels generated during hydration through their large specific surface area. The C-S-H gels adsorbed on the surface of NS particles act as crystal nuclei as they propagate between the cement particles [ 65 ]. This increases strength and promotes setting by further accelerating the cement hydration reaction and forming more C-S-H gels.…”

Section: Resultsmentioning

confidence: 99%

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Hydration and Mechanical Properties of High-Volume Fly Ash Concrete with Nano-Silica and Silica Fume

2022

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This study investigated the effects of nano-silica (NS) and silica fume (SF) on the hydration reaction of high-volume fly ash cement (HVFC) composites. In order to solve the dispersibility problem caused by the agglomeration of NS powder, NS and NSF solutions were prepared. NS content and SF content were used as main variables, and an HVFC paste was prepared in which 50% of the cement volume was replaced by fly ash (FA). The initial heat of hydration was measured using isothermal calorimetry to analyze the effects of NS and SF on the initial hydration properties of the HVFC. In addition, the compressive strength was analyzed by age. The refinement of the pore structure by the nanomaterial was analyzed using mercury intrusion porosimetry (MIP). The results show that the addition of NS and SF shortened the setting time and induction period by accelerating the initial hydration reaction of HVFC composites and improved the compressive strength during the initial stage of hydration. In addition, the micropore structure was improved by the pozzolanic reaction of NS and SF, thereby increasing the compressive strength during the middle stage of hydration.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Hydration and Mechanical Properties of High-Volume Fly Ash Concrete with Nano-Silica and Silica Fume

2022

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“…Shaikh et al [ 18 ] studied the addition of nano-silica on the performance of high-volume fly ash mortar, and the test results showed that the addition of 2% nano-silica was the optimal content in the high-volume fly ash mortar wherein it resulted in the highest compressive strength both at an early and later age. Xi et al [ 19 ] developed a high-performance cement-based material containing nano-silica and fly ash cenosphere and studied the physical and mechanical properties of this material. They found that the addition of nano-silica decreased the porosity and improved the compactness of the material system due to its high pozzolanic reactivity.…”

Section: Introductionmentioning

confidence: 99%

Multi-Response Optimization of Ultrafine Cement-Based Slurry Using the Taguchi-Grey Relational Analysis Method

Zhang

Qiao

et al. 2020

Materials

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The grouting technique is an important method in underground engineering that prevents water seepage and reinforces fractured rock mass. In this research, ultrafine cement-based grouting material, including ultrafine cement (UC), ultrafine fly ash (UFA), polycarboxylate superplasticizer (SP), colloidal nanosilica (CNS), sodium sulfate solution (SS) and water, was developed. The flow time, viscosity, bleeding, setting time and uniaxial compressive strength of the UC-based slurry were measured by orthogonal experiments, and the optimal mix proportion of the UC-based slurry was obtained based on the Taguchi-Grey relational analysis method. Microstructure analysis of the UC-based slurry was conducted using scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) tests. The results showed that the Bingham model could provide a satisfactory description of the rheological properties of the UC-based slurry. The addition of CNS and SS could promote the hydration of the UC-based slurry and improve the microstructure of the hardened slurry, thereby increasing the strength of the hardened slurry. The optimum ratio for the UC-based slurry was water/solid (W/S) ratio of 1.0, and the contents of UFA, SP, CNS and SS by mass of UC were 40%, 0.2%, 4% and 4%, respectively.

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“…In recent years, applying nanomaterials to cementbased composites has increasingly been a popular topic, and nanotechnology could modify the properties of cement-based composites, and also reduce CO2 emission and raw materials. Adding various types of nanomaterials, such as multi-walled carbon nanotubes (MWCNTs) (Xu et al 2019), graphene oxide (GO) (Lu et al 2016), nano-SiO2 (NS) (Li et al 2016;Xi et al 2020;Ding et al 2021;Zhou et al 2021), and nano-CaCO3 (NC) (Ding et al 2020), has been proved to be an effective method for improving the properties of ECC. These nanomaterials could act as nucleation sites and thus accelerate the hydration of cement particles, which would provide more hydration products, and fill the pores.…”

Section: Introductionmentioning

confidence: 99%

Nanofibrillated celluloses for the performance improvement of ultra-high ductility cementitious composites

Liang

Zhang

Liu

et al. 2021

Preprint

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This study explored the effect of nanofibrillated celluloses (CNF), namely 0%, 0.05%, 0.1%, and 0.15% of binders weight, on the hydration, rheology, pore structure, and mechanical properties of ultra-high ductility cementitious composites (UHDCC). The hydration kinetics were conducted with different CNF contents using isothermal calorimetry (IC), showing a retardation effect of CNF on the early hydration of UHDCC matrices at 70 h due to the absorption of CNF on the surface of cement particles. Then, thermogravimetric analysis (TGA) demonstrated that CNF improved the degree of hydration at 28 days due to the formation of the CNF transport of water into unhydrated cement cores. The two rheological parameters, namely the yield stress and plastic viscosity, of the fresh UHDCC matrices increased with the increasing CNF contents. Low-field nuclear magnetic resonance (LF-NMR) analysis, as a non-destructive method, proved that the addition of CNF could reduce the porosity of UHDCC and refine its pore size distribution, and the 8.9–46.1% enhancement in the compressive strength of corresponding specimens was found. Notably, CNF could increase the tensile initial cracking stress by 91.2% and tensile stress by 30.8% of UHDCC, and maintain or increase its over 8% of tensile strain-hardening capacity. The flexural tests also were found a 54.6% increase in the initial stress and a 14.8% increase in the peak stress. As a preliminary, CNF shows crucial promising as a greener nanomaterial to improve the strength and ductility of UHDCC.

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Use of nano-SiO2 to develop a high performance green lightweight engineered cementitious composites containing fly ash cenospheres

Cited by 79 publications

References 41 publications

Hydration and Mechanical Properties of High-Volume Fly Ash Concrete with Nano-Silica and Silica Fume

Hydration and Mechanical Properties of High-Volume Fly Ash Concrete with Nano-Silica and Silica Fume

Multi-Response Optimization of Ultrafine Cement-Based Slurry Using the Taguchi-Grey Relational Analysis Method

Nanofibrillated celluloses for the performance improvement of ultra-high ductility cementitious composites

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