Enhanced early hydration and mechanical properties of cement-based materials with recycled concrete powder modified by nano-silica

Liu, Xiaoyan; Liu, Li; Lyu, Kai; Li, Tianyu; Zhao, Pingzhong; Liu, Ruidan; Zuo, Junqing; Fu, Feng; Shah, Surendra P.

doi:10.1016/j.jobe.2022.104175

Cited by 46 publications

(14 citation statements)

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“…NS is a nontoxic, tasteless, nonpolluting new inorganic chemical material that can improve the aging resistance and chemical resistance of other materials. − The addition of NS into cement can promote the formation of calcium silicate hydrate and improve the strength of the material. Because the carbon atoms in MWCNTs adopt sp 2 hybridization and have the characteristics of a high modulus and high strength, multiwalled carbon nanotubes have good tensile and compressive properties. − GO has the advantages of a large specific surface area, excellent surface chemical properties, and hydrophilicity and can improve the strength and toughness of composites by synergistic action with other materials. − In this experiment, MWCNTs with a particle size of 10,000 mesh NS, a sheet diameter of <30 μm, a sheet thickness of 1 nm, an outer diameter of 8–15 nm, an inner diameter of 3–5 nm, and a length of 3–12 μm were selected as the sealing modification material. In addition, the bulk density of MWCNTs is 0.15 g/cm 3 , and the actual density is 2.1 g/cm 3 .…”

Section: Experimental Studiesmentioning

confidence: 99%

“…Because the carbon atoms in MWCNTs adopt sp 2 hybridization and have the characteristics of a high modulus and high strength, multiwalled carbon nanotubes have good tensile and compressive properties. 27 − 29 GO has the advantages of a large specific surface area, excellent surface chemical properties, and hydrophilicity and can improve the strength and toughness of composites by synergistic action with other materials. 30 − 32 In this experiment, MWCNTs with a particle size of 10,000 mesh NS, a sheet diameter of <30 μm, a sheet thickness of 1 nm, an outer diameter of 8–15 nm, an inner diameter of 3–5 nm, and a length of 3–12 μm were selected as the sealing modification material.…”

Section: Experimental Studiesmentioning

confidence: 99%

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Study on the Mechanics and Pore Characteristics of Coal Seam Drilling Sealing Materials Based on Nanomaterial Optimization

Yu¹,

Xie

2022

ACS Omega

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In order to modify and optimize the performance of cement-based sealing materials and improve the gas drainage rate of boreholes. In this paper, nanosilica (NS), multiwalled carbon nanotubes (MWCNT), and graphene oxide (GO) were used to modify cement and optimize the pore structure. Uniaxial compression tests, X-ray diffraction (XRD), nuclear magnetic resonance (NMR), and combined fractal theory were used to analyze the mechanics and pore characteristics. The results show that the synergy of the three nanomaterials promotes the generation of hydration products such as calcium silicate hydrate (C–S–H) and ettringite (AFt), improves the total pore fractal dimension ( D w ) and seepage pore fractal dimension ( D s ), and optimizes the microscopic pore structure. However, when the content of NS increases from 2 to 4 wt %, the improvement in the mechanical properties is obviously weakened. The best ratio is where the SiO 2 content is 2 wt %, the MWCNT content is 0.1 wt %, and the GO content is 0.03 wt %. Compared with pure cement, the fractal dimension increases significantly, the mechanical properties are increased by 24.7%, and the total porosity is reduced by 23.9%. This paper is of great significance for improving the efficiency of gas mining.

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Section: Experimental Studiesmentioning

confidence: 99%

Section: Experimental Studiesmentioning

confidence: 99%

Study on the Mechanics and Pore Characteristics of Coal Seam Drilling Sealing Materials Based on Nanomaterial Optimization

Yu¹,

Xie

2022

ACS Omega

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“…In presence of RCP, the hydration products of cement-based materials decreased but on addition of NS, properties are improved. NS improves the properties by filling the press, increasing the nucleation of hydration products and increasing pozzolanic reaction [50]. The whole processes are given in Fig.…”

Section: Figure 15 Hydration Of Cement In Presence Of Ns [49]mentioning

confidence: 99%

Effect of Nanomaterials on the Properties of Binding Materials in the Construction Industry

Singh

2023

Emerging Nanomaterials and Their Impact on Society in the 21st Century

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The construction industry uses a lot of binding materials. One of the most important binders is cement and concrete. Most used cement in concrete is Portland cement (OPC). Its manufacture consumes lot of raw materials and energy and emits huge amounts of hazardous gases particularly CO2 into the atmosphere. Attempts are being made to overcome the above problems by using blended cements, geopolymer and LC3 cements. However, there are a number of limitations in using alternatives to OPC. In recent years researches are being carried out to use nanomaterials such as nano silica, nano titanium oxide, nano alumina, nano CaCO3, nano clay, nano carbons, etc. in cement and concrete to improve the properties. The basic objectives of using nanomaterials in binding materials are to increase mechanical properties and durability. Nanomaterials, if added in appropriate amounts, accelerate the hydration, increase mechanical properties and decrease the porosity. In addition to improving physical properties, nanomaterials particularly nano TiO2 acts as a cleaning agent. Nano embedded phase change materials perform better. Since it is a new field, little work has been done so far. In the present chapter the effect of different nanomaterials on the properties of OPC, concrete, geopolymer cement and LC3 cement have been discussed at length.

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“…Several researchers have found that NS particles can improve the mechanical performance and durability of concrete [ 38 , 39 ]. Liu et al and Mokhtar et al [ 40 , 41 ] investigated that the addition of NS particles had the best effect in improving the mechanical performances of concrete. However, when NS content was greater than 2%, NS became self-dry and aggregate, resulting in strength losses and microcracks of cementitious composites.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Nano-SiO2 Reinforced Geopolymer Concrete under the Coupling Effect of a Wet–Thermal and Chloride Salt Environment

Jin

Zhang

et al. 2022

Polymers

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In this study, the mechanical behaviors of nano-SiO2 reinforced geopolymer concrete (NS-GPC) under the coupling effect of a wet–thermal and chloride salt environment were investigated through a series of basic experiments, and a simulation on the coupling effect of a wet–thermal and chloride salt environment and SEM test were also included. During the experiments for the coupling effect of the wet–thermal and chloride salt environment, an environment simulation test chamber was utilized to simulate the wet–thermal and chloride salt environment, in which the parameters of relative humidity, temperature, mass fraction of NaCl solution and action time were set as 100%, 45 °C, 5% and 60 d, respectively. The content of nano-SiO2 (NS) particles added in geopolymer concrete (GPC) were 0, 0.5%, 1.0%, 1.5% and 2.0%. The result indicated that the mechanical properties of NS reinforced GPC decreased under the coupling effect of the wet–thermal and chloride salt environment compared to the control group in the natural environment. When the NS content was 1.5%, the cube and splitting tensile strength, elastic modulus and impact toughness of GPC under the coupling environment of wet–thermal and chloride salt were decreased by 9.7%, 9.8%, 19.2% and 44.4%, respectively, relative to that of the GPC under the natural environment. The addition of NS improved the mechanical properties of GPC under the coupling effect of the wet–thermal and chloride salt environment. Compared to the control group without NS, the maximum increment in cube compressive strength, splitting tensile strength and elastic modulus of NS–GPC under the coupling effect of the wet–thermal and chloride salt environment due to the incorporation of NS reached 25.8%, 9.6% and 17.2%, respectively. Specifically, 1.5% content of NS increased the impact toughness, impact numbers of initial crack and the ultimate failure of GPC by 122.3%, 109% and 109.5%, respectively.

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Enhanced early hydration and mechanical properties of cement-based materials with recycled concrete powder modified by nano-silica

Cited by 46 publications

References 46 publications

Study on the Mechanics and Pore Characteristics of Coal Seam Drilling Sealing Materials Based on Nanomaterial Optimization

Study on the Mechanics and Pore Characteristics of Coal Seam Drilling Sealing Materials Based on Nanomaterial Optimization

Effect of Nanomaterials on the Properties of Binding Materials in the Construction Industry

Mechanical Properties of Nano-SiO2 Reinforced Geopolymer Concrete under the Coupling Effect of a Wet–Thermal and Chloride Salt Environment

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