A new kind of nano-rod shaped polycarboxylic acid slump-retaining agent was synthesized. Transmission
electron microscope (TEM) experiment showed that the nano-rod was bound together as macromolecular
aggregates in solution. Application performance studying suggested that this kind nano-sized polymer material
had excellently plasticity-retaining performance in cement-based materials and could improve endurance performance
of hardened cement-based materials distinctly. The concrete with an initial slump of 2—9 cm could achieve
3 h plasticity-retaining performance with the help of this kind nano-rod. The product had extremely wide application
value in the market.
DUAN Guo-rong1,2* (段国荣), HUANG Guo-hong1,2 (黄国泓), LI Ai-mei2 (李爱梅), ZHU Ye-ran (朱烨然), GONG Ying1,2 (龚英)
. Preparation and Characterization of a New Kind of Nano-rod Shaped
Polycarboxylate Slump-Retaining Admixture Using for Concrete[J]. Journal of Shanghai Jiaotong University(Science), 2012
, 17(5)
: 541
-544
.
DOI: 10.1007/s12204-012-1322-9
[1] Flatt R J, Schober I, Raphael E, et al. Conformation of adsorbed comb copolymer dispersants [J].Langmuir, 2009, 25: 845-855.
[2] Ma B G, Wang X G, Liang W Q, et al. Study on early-age cracking of cement-based materials with superplasticizers[J]. Construction and Building Materials,2007, 21: 2017-2022.
[3] Shi H S, Kan L L. Study on the properties of chromium residue-cement matrices (CRCM) and the influences of superplasticizers on chromium (VI)-immobilising capability of cement matrices [J]. Journal of Hazardous Materials, 2009, 162: 913-919.
[4] Diamond S. The patch microstructure in concrete: The effect of superplasticizer [J]. Cement and Concrete Research, 2006, 36: 776-779.
[5] Ran Qian-ping, Tian Qian, Liu Jia-ping. The process for the cleaner production, performance and engineering applications of novel carboxylic grafted polymeric concrete slump retaining agent [J]. Journal of Basic Science and Engineering, 2003, 11(3): 304-309(in Chinese).
[6] Felekogl B, Sarikahya H. Effect of chemical structure of polycarboxylate-based superplasticizers on workability retention of self-compacting concrete [J].Construction and Building Materials, 2008, 22(9):1972-1980.
[7] Yamanda K, Takahashi T, Hanehara S, et al. Effects of the chemical structure on the properties of polycarboxylate-type superplasticizer [J]. Cement and Concrete Research, 2000, 30(2): 197-207.
[8] Li C Z, Feng N Q, Li Y D, et al. Effects of polyethlene oxide chains on the performance of polycarboxylate-type water-reducers [J]. Cement and Concrete Research, 2005, 35(5): 867-873.
[9] Borget P, Galmiche L, Meins J F, et al. Microstructural characterisation and behaviour in different salt solutions of sodium polymethacrylate-g-PEO comb copolymers [J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2005, 260: 173-182.
