Effect of nanosilica on the compressive strength development and water absorption properties of cement paste and concrete containing Fly Ash

Ehsani, Ahmad; Nili, Mahmoud; Shaabani, Keyvan

doi:10.1007/s12205-016-0853-2

Cited by 52 publications

(12 citation statements)

References 44 publications

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“…Thus the capillary absorption coefficient of concrete can be reduced only when the appropriate amount of FA is added. The test results in the current study are compatible with the results in Ehsani et al and Benli et al…”

Section: Resultssupporting

confidence: 93%

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Zhao

Ding

Huang

et al. 2019

Structural Concrete

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Capillary absorption capacity has an important influence on the durability of concrete and is closely related to pore structure. In this study, the pore structure and capillary water absorption of samples were determined by low-field nuclear magnetic resonance spectroscopy and the gravimetric method, respectively. The test results show that the most probable pore diameter and equivalent pore diameter of cement-based materials increase with increasing water to cement ratio (w/c) and fly ash (FA) content and decrease with increasing curing age and cement to sand ratio (c/s). The porosity of cement-based materials increases with increasing w/c and c/s, decreases with increasing curing age, and first decreases and then increases with increasing FA content. The curves for the amount of capillary water absorption per unit area in specimens with the square root of time for cement-based material under different influence factors are similar and show obvious linear and stable stages.The capillary absorption coefficient is nearly linearly related to w/c or c/s, and nonlinearly related to curing age or FA content, observation that are well correlated with the porosity and square root of the equivalent pore radius. A modified model is proposed for the capillary absorption coefficient with consideration of the pore structure, and the theoretical results of the model are in good agreement with the test results. K E Y W O R D Scapillary absorption coefficient, cement-based materials, equivalent pore radius, low-field nuclear magnetic resonance spectroscopy, modified model, porosity Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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Section: Resultssupporting

confidence: 93%

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Zhao

Ding

Huang

et al. 2019

Structural Concrete

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“…The pore structure of cement-based composites has a very important effect on its mechanical properties [ 40 ]. In this study, the capillary water adsorption coefficient obtained through the capillary water absorption test indirectly reflects the internal pores of the composites.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Properties and Microstructure of Calcium Sulfate Whisker-Reinforced Cement-Based Composites

Cao

Liu

et al. 2022

Materials

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This study aims to investigate the effect of calcium sulfate whisker (CSW) on the properties and microstructure of cement-based composites. Further, nanosilica (NS) was used as a comparison. The results show that the compressive strength and fracture toughness of cement-based composites increased by 10.3% and 10.2%, respectively, with 2% CSW. The flexural strength, splitting tensile strength, and fracture energy increased by 79.7%, 34.8%, and 28.7%, respectively, with 1% CSW. With the addition of CSW, shrinkage deformation was aggravated, and the capillary water absorption coefficients were clearly reduced. Compared with NS, CSW-reinforced cement-based composites show better tensile, flexural, and fracture properties and smaller shrinkage deformations and capillary water absorption coefficients. The residual mechanical properties of all groups improve when the treating temperature is lower than 400 °C and decline rapidly when the temperature goes over 600 °C. When treated at 900 °C, the residual mechanical properties are 40% less than those at ambient temperature, with the NS group showing the best performance, followed by the control group and the CSW group. X-ray diffraction (XRD) and scanning electron microscopy (SEM) tests show that the addition of CSW improves the microstructure of the matrix. CSW can reinforce and toughen composites by generating ettringite and whisker pullout, whisker breakage, crack bridging, and crack deflection at the microstructure level.

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“…El-Didamony, et al, [19] showed that both FA and NS improve the hydration behavior and mechanical properties of composite pastes. Ehsani, et al, [20] concluded that the addition of SNP activated the early-age FA-based concrete and improved the strength development of cement paste and concrete than those specimens without SNP. The compressive strengths and flexural strengths improved in cement pastes including SNP as well as those of the cement pastes containing SF and FA, this is due to the nano-sized particles and extensive surface area of SNP [21,22].…”

Section: Introductionmentioning

confidence: 99%

Superior-mechanical, microstructure properties of composite cement incorporating SiO2-nano-particles

et al. 2020

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T HE impact of silica-nano-particles (SNP) on the hydration characteristics of composite cement containing fly ash (FA) and/or fine granulated slag (FGS) was investigated. The physico-chemical characteristics of different composite-pastes are studied in the presence of 4mass% SNP and 40% FA and/or FGS with the existence of 1mass% polycarboxylate superplasticizer (SP). The physicomechanical characteristics are studied by determination of the water of consistency, setting times (STs), compressive strength (CS), total porosity, (TP), bulk density (BD), chemically combined water (Wn), free lime (FL) contents and gel/ space ratio (X). The phase composition of the formed hydrates is investigated using XRD, DTA∕TGA, and SEM techniques. The represented data shown that 4% SNP improved the hydration process of the composite cement pastes and exhibited superior-compressive strength than neat-cement without SNP, this is due to nano-sized-particles and higher-efficiency of good pozzolanic-action of SNP in the comparison with FA and FGS. The composite cement containing OPC-40%FGS-4%NS in presence of 1%SP possess the highest improvement of mechanical-properties, hydration-kinetics, and microstructure of hardened cement pastes.

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Effect of nanosilica on the compressive strength development and water absorption properties of cement paste and concrete containing Fly Ash

Cited by 52 publications

References 44 publications

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Mechanical Properties and Microstructure of Calcium Sulfate Whisker-Reinforced Cement-Based Composites

Superior-mechanical, microstructure properties of composite cement incorporating SiO2-nano-particles

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