New insights into the retardation mechanism of PCE superplasticisers on cement hydration
Source abstract
Abstract
In this study, the retardation mechanism of polycarboxylate (PCE) superplasticisers on cement hydration from the viewpoint of the dissolution–precipitation process was investigated. Effects of PCE superplasticisers on hydration of Portland cement (OPC), C3A (tricalcium aluminate, Ca3Al2O6)−gypsum and pure C3S (tricalcium silicate, Ca3SiO5) and on precipitation of synthetic calcium silicate hydrates (C−S−H) were studied by means of calorimetry and solution analysis. Results show that PCE with a higher charge density and shorter side chain exhibits a stronger retardation effect on cement hydration. The PCE additions inhibit C3S hydration in a similar manner as in the cement pastes, while promoting the depletion of gypsum and secondary hydration of C3A in the C3A−gypsum paste. Furthermore, in OPC systems, the PCE delays C−S−H precipitation without inhibiting dissolution of C3A and C3S, which is responsible for the retardation. Based on the experimental results, a complete view on the retardation mechanism of PCE is proposed: the extension of the dormant period originates from the heightened saturation index required for C−S−H nucleation and growth because of the enhanced stabilisation of C−S−H nuclei by the adsorbed PCE.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Concrete and Cement Materials Research · Microbial Applications in Construction Materials · Concrete Properties and Behavior
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Beijing University of Technology College of Materials Science and Engineering, , Beijing, ; State Key Laboratory of Materials Low-Carbon Recycling, Beijing University of Technology, Beijing, China
Tsinghua University Department of Civil Engineering, , Beijing,
Funding
National Natural Science Foundation of China · R&D Program of Beijing Municipal Education Commission
References (54)
Show source-provided references
1. New insights into the effect of calcium hydroxide precipitation on the kinetics of tricalcium silicate hydration10.1111/j.1551-2916.2010.03656.x ↗
2. Preparation of amphoteric polycarboxylate superplasticizer at low temperature and its application in cement-calcined kaolin blended system10.1016/j.jclepro.2023.140542 ↗
3. Impact of admixtures on the hydration kinetics of Portland cement10.1016/j.cemconres.2011.03.005 ↗
4. Fluidizing efficiency of comb-like superplasticizers: the effect of the anionic function, the side chain length and the grafting degree10.1016/j.cemconres.2015.02.001 ↗
5. Kinetics of tricalcium silicate hydration in diluted suspensions by microcalorimetric measurements10.1111/j.1151-2916.1990.tb06455.x ↗
6. Effects of molecular structure of polycarboxylate-type superplasticizer on the hydration properties of C3S10.1007/s11595-012-0545-9 ↗
7. The effect of alginates on the hydration of calcium aluminate cement10.1016/j.carbpol.2020.116038 ↗
8. Surface and intercalation chemistry of polycarboxylate copolymers in cementitious systems10.1111/j.1551-2916.2009.03413.x ↗
9. Influence of polycarboxylate superplasticizers with different functional units on the early hydration of C3A-gypsum10.3390/ma12071132 ↗
10. Hydration kinetics of tricalcium silicate with the presence of portlandite and calcium silicate hydrate10.1016/j.tca.2019.178398 ↗
11. Change in reaction kinetics of a Portland cement caused by a superplasticizer calculation of heat flow curves from XRD data10.1016/j.cemconres.2011.10.005 ↗
12. Morpho-topological investigation of the mechanisms and kinetic regimes of alite dissolution10.1016/j.cemconres.2015.06.001 ↗
13. Role of pH on the structure, composition and morphology of C-S-H–PCE nanocomposites and their effect on early strength development of Portland cement10.1016/j.cemconres.2017.09.002 ↗
14. The influence of silanes on hydration and strength development of cementitious systems10.1016/j.cemconres.2014.10.008 ↗
15. Effect of pre-soaked superabsorbent polymer on shrinkage of high-strength concrete10.1617/s11527-014-0351-2 ↗
16. Effect of polymer latexes with cleaned serum on the phase development of hydrating cement pastes10.1016/j.cemconres.2016.02.013 ↗
17. Recent advance of chemical admixtures in concrete10.1016/j.cemconres.2019.105834 ↗
18. Effect of highly carboxylated colloidal polymers on cement hydration and interactions with calcium ions10.1016/j.cemconres.2018.08.010 ↗
19. Towards a further understanding of cement hydration in the presence of triethanolamine10.1016/j.cemconres.2020.106041 ↗
20. Marchon · 2016 · 12910.1016/B978-0-08-100693-1.00008-4 ↗
21. Molecular and submolecular scale effects of comb-copolymers on tri-calcium silicate reactivity: toward molecular design10.1111/jace.14695 ↗
22. Role of adsorption phenomena in cubic tricalcium aluminate dissolution10.1021/acs.langmuir.6b03474 ↗
23. Influence of industrial and agricultural by-products as cementitious blends in self-compacting concrete–a review10.1007/s12633-021-01043-1 ↗
24. A new view on the kinetics of tricalcium silicate hydration10.1016/j.cemconres.2016.04.009 ↗
25. The di- and tricalcium silicate dissolutions10.1016/j.cemconres.2013.01.017 ↗
26. Impact of zeta potential of early cement hydration phases on superplasticizer adsorption10.1016/j.cemconres.2007.01.007 ↗
27. Study on the interaction between anionic and cationic latex particles and Portland cement10.1016/j.colsurfa.2008.08.005 ↗
28. Synthesis and performance of methacrylic ester based polycarboxylate superplasticizers possessing hydroxy terminated poly(ethylene glycol) side chains10.1016/j.cemconres.2008.01.007 ↗
29. Chemical admixtures — chemistry, applications and their impact on concrete microstructure and durability10.1016/j.cemconres.2015.05.016 ↗
30. Study on the early crystallization of calcium silicate hydrate (C-S-H) in the presence of polycarboxylate superplasticizers10.1016/j.jorganchem.2018.02.005 ↗
31. Early C3A hydration in the presence of different kinds of calcium sulfate10.1016/j.cemconres.2009.07.019 ↗
32. Hydration of C3A–gypsum systems10.1016/j.cemconres.2012.04.005 ↗
33. Hydration kinetics of tri-calcium silicate in the presence of superplasticizers10.1021/jp027346b ↗
34. Study of precipitation reactions by X-ray microscopy: CaCO3 precipitation and the effect of polycarboxylates10.1021/la0004193 ↗
35. SAC (Standardization Administration of the People’s Republic of China) · 2008
36. Hydration kinetics and activation energy of cement pastes containing various nanoparticles10.1016/j.compositesb.2021.108836 ↗
37. Advances in understanding cement hydration mechanisms10.1016/j.cemconres.2019.105823 ↗
38. New insights into tricalcium silicate hydration in paste10.1111/jace.16133 ↗
39. Use of micro-reactors to obtain new insights into the factors influencing tricalcium silicate dissolution10.1016/j.cemconres.2015.07.011 ↗
40. Comparative study of two PCE superplasticizers with varied charge density in Portland cement and sulfoaluminate cement systems10.1016/j.cemconres.2018.10.003 ↗
41. The effects of nano-C-S-H with different polymer stabilizers on early cement hydration10.1111/jace.16425 ↗
42. The acceleration mechanism of nano-C-S-H particles on OPC hydration10.1016/j.conbuildmat.2020.118734 ↗
43. Impacts of two alkanolamines on crystallization and morphology of calcium hydroxide10.1016/j.cemconres.2020.106250 ↗
44. Influences of PCE superplasticizers with varied architectures on the formation and morphology of calcium hydroxide crystals10.1016/j.cemconres.2021.106670 ↗
45. Effects of the molecular architecture of comb-shaped superplasticizers on their performance in cementitious systems10.1016/j.cemconcomp.2006.12.006 ↗
46. Effects of the chemical structure on the properties of polycarboxylate-type superplasticizer10.1016/S0008-8846(99)00230-6 ↗
47. Influences of superplasticizer, polymer latexes and asphalt emulsions on the pore structure and impermeability of hardened cementitious materials10.1016/j.conbuildmat.2013.11.104 ↗
48. 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 ↗
49. Effects of the charge characteristics of polycarboxylate superplasticizers on the adsorption and the retardation in cement pastes10.1016/j.cemconres.2014.10.004 ↗
50. Effects of comb-shaped superplasticizers with different charge characteristics on the microstructure and properties of fresh cement pastes10.1016/j.conbuildmat.2017.08.087 ↗
51. Working mechanism of post-acting polycarboxylate superplasticizers containing acrylate segments10.1002/app.45753 ↗
52. Retardation effect of PCE superplasticizers with different architectures and their impacts on early strength of cement mortar10.1016/j.cemconcomp.2019.103369 ↗
53. Syntheses of polycarboxylate superplasticizers: Microwave induction versus conventional thermal induction10.1016/j.compositesb.2020.108560 ↗
54. Interaction of polycarboxylate-based superplasticizers with cements containing different C3A amounts10.1016/j.cemconcomp.2009.01.005 ↗