| 摘要: |
| 以煤液化残渣（DCLR）为原材料制备了煤液化残渣基地聚物（DG），并通过调节碱激发剂（AA）模数及其掺量、养护龄期及DCLR粒径，研究了DG试样的工作性能、力学性能、微观结构及化学组分变化.结果表明：DG的无侧限抗压强度与抗折强度均随着AA模数与掺量的增加呈先增加后降低的趋势，在AA模数为1.4、掺量为50%时，试样中硅铝酸盐凝胶最多，结构最致密，强度最大；DG试样的早期强度较高，其1 d抗压强度与抗折强度均达到28 d的70%以上；AA模数的改变对DG浆体流动度的影响并不显著；DCLR粒径越小，DG试样的力学性能越好，且DCLR粒径越大，DG试样养护7 d后强度提升越快. |
| 关键词: 地聚物 煤液化残渣 碱激发 力学性能 微观特性 |
| DOI：10.3969/j.issn.1007-9629.2023.08.006 |
| 分类号:TU528 |
| 基金项目:国家自然科学基金资助项目（52178431）；山西省交通运输厅科技项目（2020-1-6，2021-1-3） |
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| Mechanical and Microscopic Properties of Alkali-Activated Direct Coal Liquefaction Residue Based Geopolymer |
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HAO Zhongqing1, GAO Yang1, ZHANG Xiao1, XUE Jianxun2, ZHANG Fengfeng3
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1.College of Civil Engineering， Taiyuan University of Technology， Taiyuan 030024， China;2.Energy Conservation Center of Changzhi， Changzhi 046099， China;3.Shanxi Changhao Environmental Protection Technology Co.， Ltd.， Changzhi 047508， China
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| Abstract: |
| Direct Coal liquefaction residue based geopolymer （DG） was prepared using direct coal liquefaction residue （DCLR） as raw material. The working performance， mechanical properties， microstructure and chemical component change of DG samples were studied by adjusting the modulus and dosage of alkali activator （AA）， curing age and DCLR particle size. The results show that the unconfined compressive strength and flexural strength of DG samples increases first and then decreases with the increase of AA modulus and dosage. When AA modulus is 1.4 and its dosage is 50%， the sample has the most aluminate silicate gel， the most compact structure and the largest strength. The early strength of the DG samples is relatively higher， with both compressive strength and flexural strength at 1 day reaching over 70% of that of 28 days. The change of AA modulus has no significant effect on the fluidity of DG slurry. The smaller the DCLR particle size， the better the mechanical properties of the DG samples. The larger DCLR particle size is， the faster the strength of DG inereases. |
| Key words: geopolymer direct coal liquefaction residue alkali-activated mechanical property microscopic property |
