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朱   星 ，姜榮斌 ，黃   杰

 

（泰州職業技術學院 ，江蘇 泰州 225300)

摘   要：為了改善地聚合物韌性，以粉煤灰 、高爐礦渣和無水硅酸鈉為原料制備地聚合物，利用 PVA 纖維對其進行增韌。采用響應面模型研究粉煤灰和礦渣比例、纖維長度、纖維摻量對地聚合物動態壓縮強度和韌性的影響，利用霍普金森壓桿試驗考察地聚合物韌性。結果表明： 加入纖維組試件動態壓縮強度在 123 . 21~ 226. 23  MPa 之間 ，是空白組的 1 . 2 ~ 2. 2 倍，韌性在 0. 52 ~ 1 . 22  MJ/m3  之間， 比空白組試件提高了 1 . 2 ~ 2. 9 倍， 纖維摻量 、纖維長度以及兩者的交互效應的 F 值大于1 ,  P 值小于 0. 05,  對試件動態壓縮強度的影響大于其他因素，纖維長度 、粉煤灰和礦渣比例以及兩者的交互效應對韌性的影響大于其他因素；在最優試驗因素下，地聚合物動態壓縮強度和韌性理論值為 228. 19 MPa 和 1 . 25  MJ/m3 , 與試驗結果非常吻合。

關鍵詞：PVA 纖維 ；增韌 ；地聚合物 ；霍普金森壓桿試驗

中圖分類號：TU528           

文獻標志碼：A            

文章編號： 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

 

*基金項目：江蘇省高等職業教育高水平專業群建設項目  (2020- 80) ;  江蘇省發改委省級工程研究中心建設項目  (JPERC2021 - 168) ;  江蘇高校“青藍工程 ”（ 蘇教師函〔2023〕27 號）；泰州市職業教育聯合會重點項目  (2024BZD03) 。

作者簡介：朱   星  (1987 一），男 ，碩士 ，講師，研究方向：混凝土材料及耐久性。

收稿日期：2023- 03- 21