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朱   星 ，姜荣斌 ，黄   杰

 

（泰州职业技术学院 ，江苏 泰州 225300)

摘   要：为了改善地聚合物韧性，以粉煤灰 、高炉矿渣和无水硅酸钠为原料制备地聚合物，利用 PVA 纤维对其进行增韧。采用响应面模型研究粉煤灰和矿渣比例、纤维长度、纤维掺量对地聚合物动态压缩强度和韧性的影响，利用霍普金森压杆试验考察地聚合物韧性。结果表明： 加入纤维组试件动态压缩强度在 123 . 21~ 226. 23  MPa 之间 ，是空白组的 1 . 2 ~ 2. 2 倍，韧性在 0. 52 ~ 1 . 22  MJ/m3  之间， 比空白组试件提高了 1 . 2 ~ 2. 9 倍， 纤维掺量 、纤维长度以及两者的交互效应的 F 值大于1 ,  P 值小于 0. 05,  对试件动态压缩强度的影响大于其他因素，纤维长度 、粉煤灰和矿渣比例以及两者的交互效应对韧性的影响大于其他因素；在最优试验因素下，地聚合物动态压缩强度和韧性理论值为 228. 19 MPa 和 1 . 25  MJ/m3 , 与试验结果非常吻合。

关键词：PVA 纤维 ；增韧 ；地聚合物 ；霍普金森压杆试验

中图分类号：TU528           

文献标志码：A            

文章编号： 1005- 8249   (2024)  06- 0031- 07 

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.06.006

ZHU Xing ,  JIANG Rongbin ,  HUANG Jie

(Taizhou Polytechnic College ,  Taizhou 225300 ,  China)

Abstract: In order to improve the toughness of geopolymer, fly ash, blast furnace slag, and anhydrous sodium silicate were used as raw materials to prepare geopolymers, and PVA fibers were used to toughen geopolymer. The response surface model was used to study the effects of fly ash and slag ratio, fiber length, and fiber content on the dynamic compressive strength and toughness of geopolymer. The Hopkinson pressure bar test was used to investigate the toughness of geopolymer. The results showed that the dynamic compressive strength of the samples with added fibers ranged from 123.21 to 226.23 MPa, which was 1.2 to 2.2 times that of the blank group. This was because the bridging effect effectively blocked the propagation of stress waves in the specimen, improving the compressive strength. The toughness ranged from 0.52 to 1.22 MJ/m3, which was 1.2 to 2.9 times higher than that of the blank group samples. According to ANOVA, the F values of fiber content, fiber length, and their interaction effect were greater than 1, and the P values were less than 0.05, indicating that they had greater impacts on the dynamic compressive strength of the specimen than other factors. The influences of fiber length, fly ash and slag ratio, and their interaction effect on toughness were greater than other factors. This was because the fibers were uniformly dispersed in the matrix and could improve the toughness of the specimen better through sliding and pulling effects. Under the optimal experimental factors, the theoretical values of dynamic compressive strength and toughness of geopolymer were 228.19 MPa and 1.25 MJ/m3, which were in good agreement with the experimental results of 227.91 MPa and 1.24 MJ/m3.

Keywords :  PVA fiber;  toughness;  geopolymer;   Hopkinson pressure bar test

 

*基金项目：江苏省高等职业教育高水平专业群建设项目  (2020- 80) ;  江苏省发改委省级工程研究中心建设项目  (JPERC2021 - 168) ;  江苏高校“青蓝工程 ”（ 苏教师函〔2023〕27 号）；泰州市职业教育联合会重点项目  (2024BZD03) 。

作者简介：朱   星  (1987 一），男 ，硕士 ，讲师，研究方向：混凝土材料及耐久性。

收稿日期：2023- 03- 21