| 王立久,黄凤远,张鸿,马希晨.纤维素基混凝土高效减水剂制备与应用研究[J].,2008,(5):679-684 |
| 纤维素基混凝土高效减水剂制备与应用研究 |
| Preparations and applications of cellulose-based concrete high-range water-reducing agent |
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| DOI：10.7511/dllgxb200805011 |
| 中文关键词: 纤维素 丁基磺酸纤维素(SBC) 高效减水剂 水泥净浆 |
| 英文关键词: cellulose sulfobutylated cellulose (SBC) high-range water-reducing agent cement paste |
| 基金项目:辽宁省自然科学基金资助项目(20062147). |
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| 中文摘要: |
| 采用1，4-丁基磺酸内酯(BS)、NaOH与纤维素反应，制备丁基磺酸纤维素(SBC)，探讨反应条件对产物性能的影响，并且测试了该产物应用性能．FT-IR谱图证实了产物的结构， SEM分析表明掺加SBC的水泥硬化浆体结构更加密实．实验结果表明， n (NaOH)∶\{ n (AGU)\}∶ n (BS)=2.5∶1∶1.7，反应时间4.5 h，反应温度75 ℃，可得到具有减水分散功能的SBC；SBC掺量为1%时，水泥净浆流动度显著提高，且流动度在120 min内只损失4%；相同掺量下SBC砂浆减水率为16.5%；SBC对水泥水化有一定缓凝作用．混凝土抗压实验结果表明，SBC能在保持相同工作性的条件下起到减水增强作用．因此，SBC有望成为具有实际应用价值的混凝土高效减水剂． |
| 英文摘要: |
| Water-soluble sulfobutylated cellulose (SBC) was prepared by polymer modification method via 1,4-butanesultone(BS), NaOH and cellulose. The structure of SBC was testified with FT-IR, and SEM was applied to study the surface of hydrated cement. The optimum conditions for the product were obtained: n (NaOH)∶ n (AGU)∶ n (BS)=2.5∶1∶1.7, and reaction time is 4.5 h, reaction temperature is 75 ℃. Its performances as water-reducing agent for cement were also studied. The results show that the fluidity of cement paste with appropriate amount of SBC can be increased obviously. When dosage is 1%, the water-reducing ratio reaches as high as 16.5% in mortar and fluidity loss is very little in 120 min, less than 4%.The SBC presents a little retarding effect on cement in the experiment. SEM shows that the structure of the hardened cement paste becomes more uniform and compact than that of the control. The results of application of SBC in concrete also indicate that SBC can improve the strength of concrete. Thus, SBC has the potential to be developed as high-range water-reducing agent. |
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