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肖   敏¹  ,  劉    建¹ ,  朱澤文^{2 , 3} ,  代   力^{2 , 3} , 張   愷² ,  江   璐⁴ ,  劉運華⁵

( 1 .  江西省交通投資集團有限責任公司項目建設管理公司 ，南昌 330200 ;  2.  江西省交通科學研究院

有限公司 ，南昌 330200 ;  3 .  長大橋梁建設技術及裝備交通運輸行業研發中心 ，南昌 330200 ;

4.  長江科學院 ，武漢 430010 ;  5 .  贛州交通投資集團有限公司 ，贛州 341000)

摘   要 ：粉煤灰作為一種摻合料常被用于水泥或混凝土中 ，但低鈣粉煤灰因活性低而利用率不高。通過機  械和化學聯用方法改性低鈣粉煤灰 ，研究利用改性后的粉煤灰替代部分地下充填水泥后對其抗壓強度的影響。結果表明： 當粉煤灰經活化處理后，替代部分水泥可顯著提高其抗壓強度 ；隨著粉煤灰替代量從21 . 5% 增至 46. 3% ,  改性低活性粉煤灰替代水泥膠結料試件的抗壓強度逐漸提高，替代量為 28 . 2% 時抗壓強度最大；當水泥替代量為 28. 2%、膠砂比為 1 ∶4 時，抗壓強度達 5. 5  MPa ,  是同等條件下水泥膠結尾砂抗壓強度的 1 . 56 倍； 經計算成本可知，粉煤灰替代 28 . 2% 的水泥用量，可節約成本 28. 7% , 具有良好的經濟效益。

關鍵詞：低活性粉煤灰 ；改性 ；替代 ；普通水泥 ；地下膠結尾砂

中圖分類號：TU521 . 4           

文獻標志碼：A           

文章編號： 1005- 8249   (2025)   02- 0006- 05 

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .02.002

 

XIAO Min¹ , LIU Jian¹,  ZHU Zewen^2 , 3 ,  DAI Li², ³,  ZHANG Kai2 ,  JIANG Lu⁴ ,  LIU Yunhua⁵

( 1 . Project Construction Management Company ,   Jiangxi  Communications Investment Group Co . ,   Ltd. ,

Nanchang 330200 ,   China; 

2. Jiangxi Transportation Research Institute  Co . ,   Ltd. ,   Nanchang 330200 ,   China;

3 . Research and Development Center on Technogies and Equipment of Long - span Bridge Construction Minsistry of Transport ,  Nanchang 330200 ,  China;  4. Changjiang River Science  Research Institute ,  Wuhan 430010 ,  China;

5 . Ganzhou Communications Investment Group Co . ,   Ltd. ,   Ganzhou 341000 ,   China)

Abstract:Fly ash is often used as an admixture in cement or concrete, but low-calcium fly ash is underutilised due to its low activity. Low-calcium fly ash was modified by mechanical and chemical combination methods to study the effect on the compressive strength of the modified fly ash after replacing part of the underground filling cement. The results show that: but when the fly ash is activated, replacing part of the cement can significantly improve its compressive strength; with the amount of fly ash substitution increased from 0 to 46.3%, the compressive strength of the specimens of the modified low activity fly ash substitution cement cement cementitious materials gradually increased, and the maximum compressive strength was achieved at the substitution of 28.2%; when the amount of cement substitution was 28.2%, and the ratio of glue and sand was 1:4, the compressive strength reached 5.5 MPa, which is the same as that of cement cementitious end sands under the same conditions. It is 1.56 times of the compressive strength of cement cemented sand under the same conditions. After calculating the cost, it can be seen that fly ash replaces 28.2% of the cement dosage and saves 28.7% of the cost, which has good economic benefits.

Key words: low-activity fly ash; modification; substitution; ordinary Portland cement; underground cementing tailings

基金項目：江西 省 交 通 運 輸 廳 科 技 項 目 ( 2021 C0008 ,   2022H0014 , 2022C0007 ) ;   江西省自 然 科 學 基 金 資 助 項 目 (20202BABL214043) ;  長江科學院中央級公益性科研院所基本科研業務費  (CKSF2019507/CL 、CKSF2023317/CL) 。

作者簡介： 肖   敏  (1985—) , 男，碩士，高級工程師，研究方向： 高速公路項目建設管理。 

收稿日期：2023- 07- 20