期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 60, 期 -, 页码 25-32出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2014.02.064
关键词
CO2-resistant cement; Lignosulfonate-based retarder; Thickening time; Compressive strength
资金
- National Natural Science Foundation [51378309]
- Shandong Provincial Natural Science Foundation [ZR2010EM003]
- Program for scientific research and development by China Railway Corporation [2013G008-F]
In this article, a new type of graft copolymer retarder as modified phosphoaluminate cement (MPC) has been discussed. Graft copolymerization of 2-acrylamido-2-methyl propane sulfonic acid (AMPS) and itaconic acid (IA) onto sodium lignosulfonate (LS) was performed using potassium persulfate as an initiator by free radical aqueous solution copolymerization. The optimal LS/AMPS/IA copolymer (OLSAI) was obtained under the optimum reaction conditions: mass ratio of LS/(AMPS + IA) = 1:1, temperature = 60 degrees C, mole ratio of AMPS/IA = 9:1, initiator concentration = 1%, pH value = 5. The synthesized copolymer OLSAI was characterized by FTIR analysis. The experimental results demonstrate that the OLSAI has excellent retarding ability, dispersing power, thermal-resistant and pressure-tolerant properties, and little negative impact on the compressive strength of MPC. The graft copolymer OLSAI is expected to be an excellent retarder for MPC. (C) 2014 Elsevier Ltd. All rights reserved.
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