Property enhancement and mechanism of cement-based composites from the perspective of nano-silica dispersion improvement
Source abstract
Abstract
Nano-silica (NS) exhibits significant potential for enhancing the properties of cement materials. However, its effectiveness in improving the properties of cement-based materials is hindered by the poor dispersion of NS within the cement matrix. In this work, the dispersibility of NS in cement solutions was improved by water reducers (FDN-C naphthalene water reducer and PCE-11 polycarboxylate superplasticizer) and mechanical dispersion methods (ultrasonication and magnetic stirrer), and their synergistic effects were investigated by ultraviolet visible spectrophotometry and zeta potential tests. Effects and mechanism of NS dispersibility on microstructure and properties of NS modified cement pastes (NS-C) were also investigated and analyzed. Results indicate that polycarboxylate superplasticizers have stronger adsorption on the surface of NS particles compared with naphthalene water reducers, which effectively improved the dispersion stability of NS in cement solutions. Furthermore, ultrasonication can ensure better dispersion of NS than magnetic stirrer. The synergistic effects of 1.0 % polycarboxylate superplasticizers and 1 h of ultrasonication enhances the dispersion of NS aggregates, thereby promoting the hydration reaction of cement and refining the pore structure. Additionally, this synergistic effect improves the workability and the compressive strength of NS-C. Thermogravimetric (TG) and industrial computed tomography (ICT) results indicated that the increase in C-S-H gel and the reduction in the volume of large pores (greater than 10 mm 3 ) in NS-C dispersed synergistically with 1 % polycarboxylate superplasticizers and 1 h of ultrasonication are the mainly reasons for the improvement in compressive strength.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Concrete and Cement Materials Research · Innovative concrete reinforcement materials · Building materials and conservation
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (51)
Show source-provided references
1. Effect of nano-silica in concrete: a review
2. A clean dispersant for nano-silica to enhance the performance of cement mortars10.1016/j.jclepro.2022.133647 ↗
3. Early hydration properties of Portland cement with lab-synthetic calcined stöber nano-SiO2 particles as modifier10.1016/j.cemconcomp.2022.104622 ↗
4. Dispersion of in-situ controllably grown nano-SiO2 in alkaline environment for improving cement paste10.1016/j.conbuildmat.2023.130460 ↗
5. Effect of nano-silica on mechanical, microstructural and durability properties of cement-based materials: a review
6. Nano-SiO2 transport and retention in saturated porous medium: influence of pH, ionic strength, and natural organics10.1016/j.jconhyd.2022.104029 ↗
7. Effect of nano-silica particles on the hydration, the rheology and the strength development of a blended cement paste10.1016/j.cemconcomp.2018.10.007 ↗
8. Preparation and characterization of a novel PA-SiO2 nanofiltration membrane for raw water treatment10.1016/j.desal.2012.04.024 ↗
9. Potential effect of surface modified nano-SiO2 with PDDA on the cement paste early hydration10.1002/slct.201904791 ↗
10. Agglomeration behavior of colloidal nano-silica and its effect on pore structure, mechanical properties and shrinkage of cement mortar10.1016/j.conbuildmat.2023.133865 ↗
11. Agglomeration and reactivity of nanoparticles of SiO2, TiO2, Al2O3, Fe2O3, and clays in cement pastes and effects on compressive strength at ambient and elevated temperatures10.1016/j.conbuildmat.2018.02.032 ↗
12. A review of dispersion of nanoparticles in cementitious matrices: nanoparticle geometry perspective10.1016/j.conbuildmat.2017.06.164 ↗
13. Effects of anionic and nonionic surfactants on the dispersion and stability of nanoSiO2 in aqueous and cement pore solutions10.1016/j.cemconres.2021.106417 ↗
14. Effect and mechanism of colloidal silica sol on properties and microstructure of the hardened cement-based materials as compared to nano-silica powder with agglomerates in micron-scale10.1016/j.cemconcomp.2019.02.015 ↗
15. Co-effect of carbon nanotube and nano-sized silica on dispersion and mechanical performance in cementitious system10.1016/j.diamond.2022.109162 ↗
16. Effect of nano-silica dispersed at different temperatures on the properties of cement-based materials
17. The effects of nanoSiO2 on the properties of fresh and hardened cement-based materials through its dispersion with silica fume10.1016/j.conbuildmat.2017.05.091 ↗
18. Rational application of nano-SiO2 in cement paste incorporated with silane: counterbalancing and synergistic effects10.1016/j.cemconcomp.2021.103959 ↗
19. Synergistic effect of surfactant and chlorine salt on dispersion of nano-SiO2 and performance of cement-based grout containing a large amount of bentonite10.1016/j.cemconcomp.2022.104587 ↗
20. The influence of different preparation methods on the aggregation status of pyrogenic nanosilicas used in concrete10.1617/s11527-012-9889-z ↗
21. Influence of dispersion methods on sulfate resistance of nanosilica-contained mortars10.1061/(ASCE)MT.1943-5533.0001882 ↗
22. Degradation of Azo dye by ultrasound in rotating flow field10.3390/separations10050321 ↗
23. Study of surface modification of nano-SiO2 with macromolecular coupling agent (LMPB-g-MAH)10.1016/j.cej.2008.03.012 ↗
24. Reinforcement of ultra-low dosage of polycarboxylate ether (PCE) grafted nano-silica sol to the mechanical and durable properties of cement mortar10.1016/j.jmrt.2022.06.087 ↗
25. Preparation and properties of nanosilica-doped polycarboxylate superplasticizer10.1016/j.conbuildmat.2020.119037 ↗
26. Fresh properties, rheological behavior and structural evolution of cement pastes optimized using highly dispersed in situ controllably grown Nano-SiO210.1016/j.cemconcomp.2022.104828 ↗
27. Properties of cement-based composites using nanoparticles: a comprehensive review10.1016/j.conbuildmat.2018.09.062 ↗
28. Surfactant-free synthesis of highly monodispersed in situ grown nano-silica on modified fly ash and its impact on the properties of cement pastes10.1016/j.conbuildmat.2024.136043 ↗
29. Systematic investigation on the interaction between SiO2 nanoparticles with different surface affinity and various surfactants10.1016/j.molliq.2020.112777 ↗
30. Effects of pce on the dispersion of cement particles and initial hydration10.3390/ma14123195 ↗
31. Impact of zeta potential of early cement hydration phases on superplasticizer adsorption10.1016/j.cemconres.2007.01.007 ↗
32. GB 175-2020, Common Portland cement, Beijing, 2020.
33. GB/T 1346-2011, Test methods for water requirement of normal consistency, setting time and soundness of the portland cement, Beijing, 2011.
34. GB/T 8077-2012, Methods for testing uniformity of concrete admixture, Beijing, 2012.
35. GB/T 17671-2021, Test method of cement mortar strength ( ISO method), Beijing, 2021.
36. Influence of side chain length of MPEG - based polycarboxylate superplasticizers on their resistance towards intercalation into clay structures10.1016/j.conbuildmat.2021.122621 ↗
37. Correlations of the dispersing capability of NSF and PCE types of superplasticizer and their impacts on cement hydration with the adsorption in fresh cement pastes10.1016/j.cemconres.2014.11.009 ↗
38. Improvement of stability and mechanical properties of cement asphalt emulsion composites using nano fibrillated celluloses10.1016/j.cemconcomp.2021.104330 ↗
39. Strain-rate-dependent performance of cementitious nanocomposites: nanosilica and the role of dispersion10.1016/j.cemconres.2022.106966 ↗
40. Effect of highly dispersed colloidal olivine nano-silica on early age properties of ultra-high performance concrete10.1016/j.cemconcomp.2022.104564 ↗
41. Research on the toughening mechanism of modified nano-silica and silane molecular cages in the multi-scale microfracture of cement-epoxy composite10.1016/j.cemconcomp.2021.104027 ↗
42. Tailoring the solution conformation of polycarboxylate superplasticizer toward the improvement of dispersing performance in cement paste10.1016/j.conbuildmat.2016.04.127 ↗
43. Selection of dispersants for stabilization of unfunctionalized carbon nanotubes in high pH aqueous suspensions: application to cementitious matrices10.1016/j.apsusc.2018.08.196 ↗
44. Investigation of strength and hydration characteristics in nano-silica incorporated cement paste10.1016/j.cemconcomp.2017.02.011 ↗
45. Effect of nano-silica on chemical and volume shrinkage of cement-based composites10.1016/j.conbuildmat.2020.118529 ↗
46. Influence of dispersants and dispersion on properties of nanosilica modified cement-based materials10.1016/j.cemconcomp.2021.103969 ↗
47. Evaluation of molybdenum tailings as replacement for fine aggregate in concrete: mechanical, corrosion resistance, and pore microstructural characteristics10.1016/j.conbuildmat.2022.127982 ↗
48. Microstructures and properties of alkali-activated slags with composite activator: effects of Na2O equivalents10.1016/j.jclepro.2024.141754 ↗
49. Frost resistance and meso-deterioration analysis of microcapsulated phase change materials modified concrete
50. Comparative study on the effects of nano-SiO2, nano-Fe2O3 and nano-NiO on hydration and microscopic properties of white cement10.1016/j.conbuildmat.2019.116767 ↗
51. Studies on early stage hydration of tricalcium silicate incorporating silica nanoparticles: part I10.1016/j.conbuildmat.2014.08.046 ↗