Effects of Highly Crystalized Nano C-S-H Particles on Performances of Portland Cement Paste and Its Mechanism

Wang, Yuli; Lü, Huijuan; Wang, Junjie; He, Huan

doi:10.3390/cryst10090816

Cited by 30 publications

(15 citation statements)

References 44 publications

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“…C 3 A affects the compressive strength after 28 days and becomes less effective after one or two years. C 4 AF does not affect the compressive strength significantly [18].…”

Section: Xrf Analysis Of Composite Cementmentioning

confidence: 87%

The Fabrication of Portland Composite Cement Based on Pozzolan Napa Soil

et al. 2021

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The objective of this study is to investigate Napa soil’s potential as an alternative additive in producing Portland composite cement. The Napa soil of Tanah Datar district, West Sumatra, Indonesia is a natural material which contains SiO2 and Al2O3 as its major components. The parameters used were the fineness of the cement particles, the amount left on a 45 μm sieve, the setting time, normal consistency, loss on ignition, insoluble parts, compressive strength and chemical composition. The composition of Napa soils (% w/w) used as variables include 4, 8, 12 and 16%. Furthermore, 8% pozzolan was used as a control in this research. The results showed that the compressive strength of Napa soil cement which contained 4% Napa soil was much better compared to that of the control on the 7th and 20th day. Furthermore, all the analyzed Napa soil cements met the standard of cement as stipulated in Indonesian National Standard, SNI 7064, 2016.

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“…C 3 A affects the compressive strength after 28 days and becomes less effective after one or two years. C 4 AF does not affect the compressive strength significantly [18].…”

Section: Xrf Analysis Of Composite Cementmentioning

confidence: 87%

The Fabrication of Portland Composite Cement Based on Pozzolan Napa Soil

et al. 2021

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“…According to the fiber reinforcement theory, the increase in fiber content up to an optimum content can lead to an increase in the number of fibers per unit volume and the increase in fiber spacing. However, it must be based on concrete compaction [ 39 , 42 , 43 , 44 , 45 ]. If the fiber content is too high (shown as >1.4 kg/m 3 in this study), it will lead to insufficient mixing and vibration of concrete, resulting in unconsolidated concrete and reduced strength.…”

Section: Discussionmentioning

confidence: 99%

Effects of Fiber and Surface Treatment on Airport Pavement Concrete against Freeze–Thawing and Salt Freezing

Lai²,

Ma³

et al. 2022

Materials

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Airport pavement concrete often suffers from freeze–thawing damage in high latitude and cold areas. In addition, the use of aircraft deicer makes the airport pavement concrete suffer from salt-freezing damage. To improve the durability of airport pavement concrete, modified polyester synthetic fiber (FC), cellulose fiber (CF), and basalt fiber (BF) reinforced concrete were prepared in this paper. The mechanical strength, pore structure, and frost resistance (freeze–thawing and salt freezing) of fiber-reinforced concrete were investigated. The effects of the combined action of fiber (fiber type and content) and surface treatment methods (spraying silane and impregnating silane) on the frost resistance of concrete were investigated. The results show that the flexural strength of concrete is positively correlated with the elastic modulus of fiber, but has little effect on the compressive strength. Fiber can reduce mass loss and dynamic modulus loss of concrete subjected to frost damage. FC more effectively improved the frost resistance of concrete than CF. After 30 cycles of salt freezing, the spalling amount of concrete sprayed or soaked with silane was decreased by 65.5% and 55.5%, respectively. Adding fiber and impregnating silane reduced the spalled concrete by up to 70.5%. Spraying silane treatment is better than impregnating silane treatment in enhancing the frost resistance of concrete because a better silane condensation reaction is achieved with spraying silane.

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“…From the viewpoint of mechanical properties, it is mainly manifested as the reduction in mechanical property indexes such as compressive strength, flexural strength, and static modulus of elasticity. Moreover, from the microscopic viewpoint, it is manifested as the expansion of micro-cracks and the degradation of the matrix in concrete [42][43][44][45][46] from dense to loose. The dynamic modulus of elasticity of concrete and transport properties [47,48] is closely related to the structure of the concrete itself, and when the internal structure of the concrete changes, the dynamic modulus of elasticity changes at the same time [49].…”

Section: Change Of Airport Pavement Concrete In High Plateau Subjecte...mentioning

confidence: 99%

Influence of Combined Air-Entraining Superplasticizer and Surface Treatments on Airport Pavement Concrete against Salt Freezing

Lai²,

Ma³

et al. 2023

Coatings

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Effective improvement of the frost resistance of concrete in cold regions is critical for the durability of airport pavement concrete in plateau. This paper intends to contribute to a better knowledge of the effects of combined air-entraining superplasticizer and surface treatments on the resistance against freezing-thawing and salt freezing. First, an optimum mixing by considering w/c, cement content, sand ratio, and air-entraining superplasticizer was obtained by comparing compressive and flexural strength, microstructure, pore distribution, and resistance to freezing-thawing of different mixes. From the results, a concrete mix with air-entraining superplasticizer, w/c = 0.4, cement amount at 330 kg/m3, and sand ratio = 0.3 was selected for airport pavement. Then, this mix was subjected to salt freezing with different surface treatments (smoothing, brushing, spraying with silane, and impregnating with silane), and the spalled mass loss in salt freeze cycles was reported. The results show that combined use air-entraining superplasticizer and surface treatments can provide an obvious improvement on the resistance to salt freezing. Compared to silane impregnation, surface treatment by silane spraying performed much better in early time.

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Effects of Highly Crystalized Nano C-S-H Particles on Performances of Portland Cement Paste and Its Mechanism

Cited by 30 publications

References 44 publications

The Fabrication of Portland Composite Cement Based on Pozzolan Napa Soil

The Fabrication of Portland Composite Cement Based on Pozzolan Napa Soil

Effects of Fiber and Surface Treatment on Airport Pavement Concrete against Freeze–Thawing and Salt Freezing

Influence of Combined Air-Entraining Superplasticizer and Surface Treatments on Airport Pavement Concrete against Salt Freezing

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