| 摘要: |
| 研究了2种具有相同侧链长度、但桥接基团不同的梳状共聚物（PC）在硅酸盐相、铝酸三钙（C3A）/石膏体系、水化产物钙矾石（AFt）和水化铝酸钙上的吸附特性，以系统认识不同分子结构的共聚物在单矿上的吸附分布.结果表明：PC在同种单矿上的吸附特性相似，主要吸附在铝酸盐相及其水化产物上；PC在较低掺量下与硅酸盐相达到吸附平衡，且饱和吸附量较小；在C3A体系中，PC的吸附量与其掺量线性相关，在掺量区间内（0~8mg/g）无吸附饱和点. |
| 关键词: 梳状共聚物 单矿 吸附 高效减水剂 |
| DOI：10.3969/j.issn.1007 9629.2012.05.003 |
| 分类号: |
| 基金项目:国家重点基础研究发展计划(973计划)项目（2009CB623205）；江苏省自然科学基金资助项目（2008507,2007722） |
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| Adsorption Characteristics of Comb Like Polycarboxylate on Pure Cement Component |
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LIU Jia ping, YU Yin hui, RAN Qian ping, ZHOU Dong liang, QIAO Min
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State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co., Ltd., Nanjing 210008, China
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| Abstract: |
| Two different kinds of comb like copolymer with same side chain length but various bridging group(ester bond, ether linkage) were used. Adsorption characteristics of copolymer on silicate phases, C3A/gypsum and its hydration products ettringite(AFt), calcium hydroaluminate were systematically investigated to elucidate the distribution of copolymer on pure cement component. The results indicate that large amount of comb like copolymer were consumed by aluminate and its relevant hydration products. Adsorption characteristics of various copolymers are similar on the same pure cement component. Only a tiny amount of adsorption is observed on silicate phases and the equilibrated concentration is not influenced by the types of copolymer. There is linear relation between adsorption amount and dosage on C3A grains, but no saturated adsorption is detected in the range of 0 to 8 mg/g. |
| Key words: comb like copolymer pure cement component adsorption superplasticizer |
