Micro- and macro-scale characterization of nano-SiO2 reinforced alkali activated slag composites

Long, Wu-Jian; Xiao, Bing-Xu; Gu, Yu-cun; Xing, Feng

doi:10.1016/j.matchar.2017.12.013

Cited by 40 publications

(12 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most researchers mentioned a decrease in fluidity or a reduction in setting time as the content of nano-silica particles increases [21,27,34,35]. Also, the improvement of mechanical properties, such as increase in compressive strength and decrease of pores, have been mentioned [20,22,27,39,40,41,42,43]. These results are similar to those reported in OPC using nano-silica.…”

Section: Introductionsupporting

confidence: 61%

“…Some researchers reported that nano-silica had little effect on the formation of C-S-H gel. Long et al [20] mentioned similar trends of C-S-H gel peaks in XRD patterns of 0 and 2% nano-silica samples in AASC. It is reported that the mixing of nano-silica does not contribute to the formation of another polymerization product in AASC.…”

Section: Resultsmentioning

confidence: 84%

“…In a study of Yang et al [43] in which 0.5% of nano-TiO 2 was mixed with alkali-activated slag pastes, the mixing of nano-TiO 2 exhibited an increase in compressive strength and flexural strength. Long et al [20] showed that the 2% replacement sample showed the highest compressive strength and flexural strength in an alkali-activated slag cement with 0 and 2% replacement of colloidal nano-silica. Prakasam et al [26] produced a geopolymer of binder with slag:fly ash = 50:50 using powdered nano-silica at 0, 0.5, and 1.0%.…”

Section: Resultsmentioning

confidence: 99%

“…Although studies using nano-particles have been extended to alkali-activated cement (AAC) [16,17,18] and geopolymers [19,20,21,22,23,24,25], the study of nano-particles for AAC and geopolymers is relatively sparse compared to OPC [26,27]. In particular, the pozzolanic reaction of nano-particles mentioned in OPC is accompanied by the consumption of portlandite [15,28,29].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Properties of Alkali-Activated Slag Paste Using New Colloidal Nano-Silica Mixing Method

Kim

Jun

2019

Materials

View full text Add to dashboard Cite

Previous studies of alkali-activated slag cement (AASC) using nano-silica have mentioned mostly powdered nano-silica and binder weight replacement methods, which have a rapid decrease in fluidity, a short setting time and a low nano-silica replacement rate (< 5%). In this study, colloidal nano-silica (CNS) was used and the mixing-water weight substitution method was applied. The substitution method was newly applied to improve the dispersibility of nano-silica and to increase the substitution rate. In the experiment, the CNS was replaced by 0, 10, 20, 30, 40, and 50% of the mixing-water weight. As a result, as the substitution rate of CNS increased, the fluidity decreased, and the setting time decreased. High compressive strength values and increased rates were also observed, and the diameter and volume of pores decreased rapidly. In particular, the increase of CNS replacement rate had the greatest effect on decrease of medium capillary pores (50–10 nm) and increase of gel pores (< 10 nm). The new displacement method was able to replace up to 50% of the mixing water. As shown in the experimental results, despite the high substitution rate of 50%, the minimum fluidity of the mixture was secured, and a high-strength and compact matrix could be formed.

show abstract

Section: Introductionsupporting

confidence: 61%

Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Properties of Alkali-Activated Slag Paste Using New Colloidal Nano-Silica Mixing Method

Kim

Jun

2019

Materials

View full text Add to dashboard Cite

show abstract

“…Its outstanding properties have drawn much attention in improving the performance of cementitious materials and have developed rapidly in decades [1][2][3][4][5][6]. e nanomaterials in cementitious composites can efficiently fill small voids to densify the cement paste matrix with the nanoscaled particles, accelerate cement hydration by supplying large active specific surface, and generate additional C-S-H gels to optimize the microstructure benefiting from the pozzolanic reactivity [7][8][9][10][11][12][13][14][15][16][17]. Nevertheless, the expensive cost and the low productive capacity of artificial nanomaterials limited their wide application in cementitious materials.…”

Section: Introductionmentioning

confidence: 99%

Well-Dispersed Silica Fume by Surface Modification and the Control of Cement Hydration

Guo

Sun

et al. 2018

Advances in Civil Engineering

View full text Add to dashboard Cite

Silica fume (SF) is a valuable nanoscaled industrial by-product used in cementitious materials owing to its filling and pozzolanic effect. However, the heavy agglomeration of SF is a severe and common problem. In this study, surface modification with polyacrylic acid (PAA) was applied on SF to achieve a better dispersion and to optimize the hydration process of cement at early age. e particle size distribution and surface properties of SF, as well as the cement hydration with modified SF, were investigated. e results demonstrated that the agglomeration of SF particles was efficiently mitigated by the surface treatment with PAA, and the acceleration effect of SF was delayed by the resistance of the surface layer at early age. However, the grafted PAA layer eventually dropped in alkali solution after 6 hours, and the hydration rate was increased again and continued for long time.is work indicated that surface-modified SF was well dispersed and was able to regulate the hydration rate of cement.

show abstract

Multi‐scale modeling for the prediction of Young's modulus of alkali‐activated slag concrete

Caron,

Patel,

Dehn

2023

ce papers

View full text Add to dashboard Cite

Alkali‐activated slag is an alternative to ordinary Portland cement that can be used for structural applications. Young's modulus is an important property to predict stress or strains in concrete. However, the fib Model Code 2010 overestimates it for alkali‐activated slag concrete. Multi‐scale models allow the determination of concrete property from the features of the microstructure. In this study, an analytical micromechanics‐based multi‐scale homogenization model is applied to predict Young's modulus of alkali‐activated slag. It is compared to experimental results found in the literature on paste, mortar and concrete. Better predictions of Young's modulus are achieved from multiscale models compared to the fib MC 2010. Accuracy could be enhanced by improving the predictions for the degree of activation of slag for the different mixes.

show abstract

Micro- and macro-scale characterization of nano-SiO2 reinforced alkali activated slag composites

Cited by 40 publications

References 39 publications

Properties of Alkali-Activated Slag Paste Using New Colloidal Nano-Silica Mixing Method

Properties of Alkali-Activated Slag Paste Using New Colloidal Nano-Silica Mixing Method

Well-Dispersed Silica Fume by Surface Modification and the Control of Cement Hydration

Multi‐scale modeling for the prediction of Young's modulus of alkali‐activated slag concrete

Contact Info

Product

Resources

About