Heating cement to slow down its hydration: The unexpected role of PCE interpolymer bridge formation
Source abstract
Abstract
PCEs with specific polymer structures at dosages over 1% were shown to delay cement hydration as temperature increased. The present work investigates this unexpected phenomenon, reporting hydration kinetics of chemically admixed cement pastes at different temperatures, mineralogical changes, chemical composition of the pore solution and rheological properties. At 23 °C, a significant increase of Si, Al, Mg and Fe in pore solution of admixed samples was measured and nano-particles (polymer aggregates and/or organo-aluminates) were detected. In contrast, these nano-particles were not present at higher temperature, 70 °C, when a dramatic hydration delay was observed. This could increase the amount of free polymer available to delay silicate hydration. Molecular dynamics simulations confirmed the formation of polymer aggregates via interpolymer bridges in presence of both calcium and aluminum at room temperature, while the ability of aluminum to bridge the polymers was reduced with the increase of the temperature.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Concrete and Cement Materials Research · Innovative concrete reinforcement materials · Magnesium Oxide Properties and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (38)
Show source-provided references
1. Molecular and submolecular scale effects of comb-copolymers on tri-calcium silicate reactivity: toward molecular design10.1111/jace.14695 ↗
2. Effect of curing temperature on cement hydration
3. The influence of sodium salts and gypsum on alite hydration10.1016/j.cemconres.2015.04.015 ↗
4. Cement hydration kinetics study in the temperature range from 15 °C to 95 °C10.1016/j.cemconres.2021.106552 ↗
5. Effect of temperature on the microstructure of calcium silicate hydrate (C-S-H)10.1016/j.cemconres.2013.06.008 ↗
6. Thermodynamic modelling of the effect of temperature on the hydration and porosity of Portland cement10.1016/j.cemconres.2007.08.017 ↗
7. Effect of temperature on the pore solution, microstructure and hydration products of Portland cement pastes10.1016/j.cemconres.2006.11.016 ↗
8. Relating early hydration, specific surface and flow loss of cement pastes10.1617/s11527-018-1304-y ↗
9. Compatibility between polycarboxylate-based admixtures and blended-cement pastes10.1016/j.cemconcomp.2012.08.020 ↗
10. Interaction of polycarboxylate-based superplasticizers with cements containing different C3A amounts10.1016/j.cemconcomp.2009.01.005 ↗
11. Effects of the molecular architecture of comb-shaped superplasticizers on their performance in cementitious systems10.1016/j.cemconcomp.2006.12.006 ↗
12. First steps to the molecular structure optimization of polycarboxylate ether superplasticizers: mastering fluidity and retardation10.1016/j.cemconres.2018.10.009 ↗
13. Influence of mixing sequence and superplasticiser dosage on the rheological response of cement pastes at different temperatures10.1016/j.cemconres.2006.02.016 ↗
14. Reliable specific surface area measurements on anhydrous cements10.1016/j.cemconres.2014.10.009 ↗
15. 7 - superplasticizers and the rheology of concrete
16. 9. Chemistry of chemical admixtures
17. Dynamic mode rheology of cement and tricalcium silicate pastes from mixing to setting10.1016/S0008-8846(00)00464-6 ↗
18. Mechanical properties and compositional heterogeneities of fresh geopolymer pastes10.1016/j.cemconres.2013.02.001 ↗
19. Basics of analytical methods used for the investigation of interaction mechanism between cements and superplasticizers10.1016/j.cemconres.2011.03.007 ↗
20. ICP-OES method for the characterization of cement pore solutions and their modification by polycarboxylate-based superplasticizers10.1016/j.cemconres.2016.10.007 ↗
21. Design and function of novel superplasticizers for more durable high performance concrete (superplast project)10.1016/j.cemconres.2008.04.007 ↗
22. Impact of sample preparation on the specific surface area of synthetic ettringite10.1016/j.cemconres.2016.04.005 ↗
23. Laser diffraction and gas adsorption techniques
24. Fast parallel algorithms for short-range molecular dynamics10.1006/jcph.1995.1039 ↗
25. BIOVIA Dassault Systèmes, Materials Studio, San Diego: Dassault Systèmes, 2018., n.d.
26. Mechanism of molecular interaction of acrylate-polyethylene glycol acrylate copolymers with calcium silicate hydrate surfaces10.1039/C9GC03287H ↗
27. Thermodynamically consistent force fields for the assembly of inorganic, organic, and biological nanostructures: the INTERFACE force field10.1021/la3038846 ↗
28. Influence of aluminates on the hydration kinetics of tricalcium silicate10.1016/j.cemconres.2017.06.006 ↗
29. Force field for tricalcium silicate and insight into nanoscale properties: cleavage, initial hydration, and adsorption of organic molecules10.1021/jp312815g ↗
30. Cemff: a force field database for cementitious materials including validations, applications and opportunities10.1016/j.cemconres.2017.09.003 ↗
31. Molecular design of comb-shaped polycarboxylate dispersants for environmentally friendly concrete10.1039/c3sm51030a ↗
32. Effect of the repartition of the PEG side chains on the adsorption and dispersion behaviors of PCP in presence of sulfate10.1016/j.cemconres.2011.11.011 ↗
33. Adsorbing polymers and viscosity of cement pastes10.1016/j.cemconres.2014.04.005 ↗
34. The Darcytron: a pressure-imposed device to probe the frictional transition in shear-thickening suspensions10.1122/1.5135370 ↗
35. Comparet · 2004
36. Modification of the rate of formation and surface area of ettringite by polycarboxylate ether superplasticizers during early C3A–CaSO4 hydration10.1016/j.cemconres.2014.12.007 ↗
37. Galmarini · 2013
38. Solubility of calcium hydroxide10.1021/j150296a010 ↗